ÿ
GE Power Management
Digital Breaker Failure Protection
DBF
Instructions
GEK 106168E
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TABLE OF CONTENTS
TABLE OF CONTENTS
1.
GENERAL DESCRIPTION AND APPLICATION........................................................................................... 1
1.1. GENERAL DESCRIPTION................................................................................................................................. 1
2. OPERATION LOGIC ...................................................................................................................................... 3
2.1. PROTECTION FUNCTIONS.............................................................................................................................. 3
2.1.1. Overcurrent units.......................................................................................................................................... 3
2.2. MONITORING AND RECORDING FUNCTIONS.............................................................................................. 5
2.2.1 Measurement ............................................................................................................................................... 5
2.2.2 Associated Breaker Status........................................................................................................................... 5
2.2.3 Target Lamps ............................................................................................................................................... 5
2.2.4 Circuit Breaker Breaking Capacity Monitoring ............................................................................................. 9
2.2.5 Built-in Self-Checking Unit.......................................................................................................................... 10
2.3. ANALYSIS FUNCTIONS......................................................................................................................................... 10
2.3.1 Event Recorder. .......................................................................................................................................... 10
2.3.1 Oscillography .............................................................................................................................................. 10
2.4. CONTROL .......................................................................................................................................................... 12
2.4.1 Tables of Settings ...................................................................................................................................... 12
2.4.2 Time Synchronization.................................................................................................................................. 13
2.4.3 Configurable Inputs and Outputs ............................................................................................................... 13
2.5. MAN-MACHINE INTERFACE (HMI)........................................................................................................................ 15
2.6. REMOTE COMMUNICATIONS................................................................................................................................ 16
3.
4.
SETTINGS.................................................................................................................................................... 17
TECHNICAL CHARACTERISTICS.............................................................................................................. 21
4.1. MODEL LIST....................................................................................................................................................... 21
4.1.1. Special Models........................................................................................................................................... 21
4.2. TECHNICAL CHARACTERISTICS ............................................................................................................................ 22
5.
HARDWARE DESCRIPTION ....................................................................................................................... 25
5.1. PHYSICAL DESCRIPTION..................................................................................................................................... 25
5.1.1. Case.......................................................................................................................................................... 25
5.1.2. Electrical Connections............................................................................................................................... 25
5.1.3. Internal Construction................................................................................................................................. 25
5.2. OPERATING THEORY.......................................................................................................................................... 27
5.2.1. Magnetic Module....................................................................................................................................... 27
5.2.2. CPU Board ................................................................................................................................................ 27
5.2.3 Power Supply ............................................................................................................................................. 28
5.2.4 Keyboard and Display ................................................................................................................................ 28
6.
ACCEPTANCE TESTS................................................................................................................................. 29
6.1. CONNECTIONS AND NECESSARY EQUIPMENT ...................................................................................................... 29
6.2. VISUAL INSPECTION ........................................................................................................................................... 29
6.3. PANEL INSULATION TESTS.................................................................................................................................. 29
6.4. RELAY SETTING................................................................................................................................................. 30
6.5. INDICATORS........................................................................................................................................................ 30
6.6. POWER SUPPLY................................................................................................................................................. 30
6.7. COMMUNICATIONS .............................................................................................................................................. 31
6.8. INPUTS ............................................................................................................................................................... 32
6.8.1 Digital inputs................................................................................................................................................ 32
6.8.2 IRIG-B Synchronizing Input........................................................................................................................ 32
6.9. FUNCTIONS......................................................................................................................................................... 33
6.9.1 50BF 1P Unit Test...................................................................................................................................... 33
6.9.2 50BF 3P Unit Test...................................................................................................................................... 34
6.9.3 Internal Arc Test......................................................................................................................................... 35
6.9.4 3P NO I FUNCTION.................................................................................................................................... 35
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DBF Breaker Failure Protection
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TABLE OF CONTENTS
6.9.5 Neutral Overcurrent Unit Test.....................................................................................................................35
6.10. RELAY MEASUREMENT TESTS...........................................................................................................................37
6.10.1. Current Measurement..............................................................................................................................37
6.10.2. Timing Measurement...............................................................................................................................37
7.
INSTALLATION AND MAINTENANCE........................................................................................................39
7.1. INSTALLATION.....................................................................................................................................................39
7.2. CONNECTION-TO-GROUND AND DISTURBANCES SUPPRESSION ............................................................................39
7.3. MAINTENANCE....................................................................................................................................................39
8.
KEYBOARD AND DISPLAY........................................................................................................................41
8.1. MENU TREE. ......................................................................................................................................................42
8.2. SETTINGS GROUP (SET KEY) ..............................................................................................................................43
8.3. INFORMATION GROUP (INF KEY)..........................................................................................................................46
8.4. CONTROL GROUP (ACT KEY) .............................................................................................................................47
8.5. SINGLE KEY MENU .............................................................................................................................................48
8.6. CONFIGURATION MENU.......................................................................................................................................49
FIGURES .................................................................................................................................................................51
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DBF Breaker Failure Protection
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LIST OF FIGURES
LIST OF FIGURES
Figure 1. Breaker Failure Logic (189C4114 Sheet 2)
Figure 2. External Connections (189C4114 Sheet 1)
Figure 3. Front View (226B7412 Sheet 9)
Figure 4. Rear View (226B7412 Sheet 10)
Figure 5. Dimensions Diagram (226B6086 sheet 10)
Figure 6. Panel drilling (226B6086H10)
Figure 7. RS232 Connection (DBF relay to PC)
Figure 8. RS232 Connection (DBF relay to MODEM)
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DBF Breaker Failure Protection
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LIST OF FIGURES
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DBF Breaker Failure Protection
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1. GENERAL DESCRIPTION AND APPLICATION
1.
GENERAL DESCRIPTION AND APPLICATION
1.1. GENERAL DESCRIPTION
The DBF system is a microprocessor based breaker failure protection, control and measurement unit that has
different algorithms to allow its use on a wide range of applications in power systems.
The functions and information management of the unit can be performed remotely (computer connected to the
serial port RS232, fiber-optic or modem) or locally using the man-machine interface (HMI), which includes a 20
keys keypad, and a two line liquid crystal display (LCD) on the front of the relay.
The system provides the following functions:
a) Protection
•
•
Low current level breaker failure protection, following a single or three phases initiation, with up to
two time delayed steps.
High current level breaker failure protection, following a two/three (selectable by setting) phases
initiation.
•
•
No current breaker failure protection, following a two/three (selectable by setting) phases initiation.
Breaker internal arc detection.
b) Monitoring
•
•
•
•
•
•
Current measurements for each phase and ground.
Breaker status
16 fully configurable LED indicators
One fixed relay status LED
2
Breaker health monitoring (ΣI t).
Built-in self-check functions.
c) Analysis:
•
•
Event recorder
Oscillography
d) Control:
•
•
3 settings’ tables
Time synchronization using the communications program, the IRIG-B input or the HMI (keypad and
display).
•
•
Configurable inputs and outputs.
User can build logic schemes using AND, OR and NOT gates and the internal digital signals of the
relay.
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DBF Breaker Failure Protection
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1. GENERAL DESCRIPTION AND APPLICATION
e) Communication Interfaces
•
•
•
Remote communications through three communication ports, one on the front of the relay and two
located on the rear.
Human machine interface (HMI) consisting of 20 keys keypad and alphanumerical LCD (16
characters x 2 lines).
Windows based GE-INTRO configuration software (for inputs, outputs, LEDs configuration) and
GE-LOCAL communications software (for relay monitoring, settings change, stored data retrieve, etc).
Both are part of the GE-NESIS software package (General Electric Network Substation Integrated
System).
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2. OPERATION LOGIC
2.
OPERATION LOGIC
(See figure 1 at the end of the Instruction Manual)
2.1. PROTECTION FUNCTIONS
2.1.1. OVERCURRENT UNITS
The DBF system incorporates the following overcurrent detectors:
•
•
•
•
Three Single Phase Low-Level Overcurrent Detectors
(Used by the 50BF 1P function.)
Three Single Phase High-Level Overcurrent Detectors.
(Used by the 50BF 3P function.)
One Ground Overcurrent Detector.
(Used by the 3P No I function.)
Three Single-Phase current detectors for the internal arc function.
Low-Level Overcurrent Breaker Failure Unit – 50BF 1P
The breaker failure operation is started by detecting any single phase above a setpoint threshold (PH Lo-Set
Pickup setting), ANDed with a tripping signal (breaker failure initiate signal) issued by the main feeder protection.
These breaker failure initiation signals can be single-phase or three-phase type at OR1, OR2 and OR3. There are
four digital signals available (50BF Initiate A, 50BF Initiate B, 50BF Initiate C and 3P BF Initiate) assignable to
any digital input (contact converter). The factory digital input configuration is the following (as shown in figure 1):
Digital Signal
50BF Initiate A
50BF Initiate B
50BF Initiate C
3P BF Initiate
Input #
Input #1
Input #2
Input #3
Input #7
Terminals
C9 – D10
D9 – D10
C10 – D10
E7 – E8
The AND1, AND2 and AND3 gates thus fully armed may perform (depending on settings) one or two time delayed
tripping steps. Use 50BF_1P setting (permitted/Not permitted) and number of output stages (N. of Output
Stages) setting to enable this function and to set the number of steps. Timers T1 and T2nd control the timing of
the first and second step respectively (1_Phase Timer T1 and 2nd Stage Timer settings).
If the tripping signal is three-pole type (digital input E7-E8 for the default factory configuration), the signal will be
placed at the same time in OR1, OR2 and OR3 and then to AND1, AND2 and AND3.
High-Level Overcurrent Breaker Failure Unit – 50BF 3P
This function operates if high-Level overcurrent is detected on 2 phases (or 3 phases if setting BF Logic (3P/2P)
is set to 3P) and if 2 breaker failure initiation inputs are energized (or just the 3P BF Initiate input, if Severe Fault
3P setting is set to permitted).
The starting of this function is similar to the 50BF 1P, but in this case the current level setting range is higher (PH
Hi-Set Pickup setting) and the output is controlled by the energization of two single pole initiation signals. This
function can also operate energizing the 3P BF Initiate signal, if Severe Fault 3P setting is set to ‘permitted’.
Other difference with respect to the 50BF 1P function, is that the current in all the three phases must exceed the
setpoint, or at least one pair of phases. This is selected with BF Logic (3P/2P) setting. In the first case (BF Logic
(3P/2P) set to 3P) the signal should progress through AND11 and AND12. If BF Logic (3P/2P) is set to 2P, then
the signal will go through AND8, AND9 or AND10 and then AND13. The outputs of AND12 or AND13 are sent via
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2. OPERATION LOGIC
OR5 to the bottom input of AND4. Any pair of single BF initiation signals placed at AND5, AND6, or AND7 will
activate the top input of AND4. This input to AND4 can also be ON if there is a 3P BF Initiation and Severe Fault
3P setting is set to ‘permitted’.
Ground Overcurrent Breaker Failure Unit.
The breaker failure action based in this ground overcurrent function basically performs an additional breaker
failure function through AND19, when the 3P BF Initiate (or 2 Single Pole BF Initiate, if Low Load 2P setting is
set to ‘permitted’) is present at OR10 and a ground current higher than Neutral Pickup setting is detected.
Breaker Failure without current (or very low current).
DBF includes internal logic to cover also no-current, or very low fault current BF applications. This function will
issue an output if the 3P BF Initiate input is energized (or 2 Single Pole BF Initiate, if Low Load 2P setting is set
to ‘permitted’), and at least one pole of the circuit breaker is still closed.
Breaker Arc Detection Device.
This function may close one output of the relay when it detects that: the circuit breaker is open and some amount
of current is present in any phase. There are two settings available for this function: ‘Internal Arc Pickup’ to set
the current threshold and ‘Internal Arc Timer’ to coordinate the operation time of the unit with the time it takes for
the breaker and auxiliary elements to open.
If the circuit breaker is open, then the 52/b contacts will energize the digital inputs corresponding to the circuit
breaker status (terminals C11-D12, D11-D12 and C12-D12 for the factory default configuration), and then the
upper input of AND16, AND17 and AND18. The other input will be energized if the DBF detects a current higher
than Internal Arc Pickup setting. The outputs of these AND gates are sent to OR8 and then to timer T4 (Internal
Arc Timer setting) to complete the arc detection function, this will close the auxiliary relay D2-C2 (according to the
factory default output configuration).
Reset of Latching Relays
The DBF breaker failure protection may be ordered with an expansion board, which includes two latching relays
that are operated in different ways depending on the number of steps selected (for additional reference see Figure
1), and will fix the tripping output once the breaker failure function has operated. A digital input through F11-F12
(factory default inputs configuration) (pulse signal, not sustained) resets these latching relays to its steady-state
position.
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2. OPERATION LOGIC
2.2.1 MEASUREMENT
2.2. MONITORING AND RECORDING FUNCTIONS
The DBF system provides the continuous measurement of phase and ground current values.
These measurements can be accessed directly on the liquid crystal display (HMI) on the front of the relay, or via
the GE-LOCAL communication software.
2.2.2 ASSOCIATED BREAKER STATUS
The DBF system monitors the associated breaker status through the digital inputs 52/b (or 52/a), and it is
displayed on the local HMI or through the communications software.
2.2.3 TARGET LAMPS
The DBF incorporates 17 LED target lamps, one fixed LED (two colors) assigned to the system ready function,
and 16 user configurable red LEDs. These configurable LEDs are arranged in two columns of 8 LEDs each. The
configuration is done using the GE-INTRO software, and it consists on assigning an internal event (or an AND
gate of internal events) to an LED. The LED can be configured to have memory (if Vdc is removed or the event
causing the operation of the LED gets deactivated) or not and to blink or to be steady. The internal events must
be previously defined using the internal signals of the relay. It is possible to use AND, OR and NOT logic gates to
define these events. The available internal signals are listed in the following table.
The TARGET RESET button allows testing all target lamps if it is pushed for a short time (lighting up all of them),
or resets the sealed-in targets if it remains pressed for three seconds or more.
Please refer to GE_INTRO (configuration software) Instruction book (GEK-105594) for further information.
INTERNAL PROTECTION STATUS SIGNALS
Group
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Status
Comment
Relay starts running (Vdc just applied).
User changes any setting
User sets a value for any counter
User changes relay configuration
Oscillography triggered by Dig. Input
Osc. triggered by HMI or GE_LOCAL
Latched Relays Reset received
Program Initiate
Settings change
Write Counters
Configuration Change
External Trigger
Communications Trigger
Reset Operation
1.7
1.8
1.9
1.10
1.11
1.12
1.13
1.14
1.15
2.0
2.1
2.2
2.3
2.4
Input Nº 1
Input Nº 2
Input Nº 3
Input Nº 4
Input Nº 5
Input Nº 6
Digital Input #1 Status
Digital Input #2 Status
Digital Input #3 Status
Digital Input #4 Status
Digital Input #5 Status
Digital Input #6 Status
2.5
2.6
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2. OPERATION LOGIC
Group
Status
Comment
2.7
2.8
2.9
2.10
2.11
2.12
2.13
2.14
2.15
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
Optional Exp. Board
Digital Input #7 Status
Digital Input #8 Status
Digital Input #9 Status
Digital Input #10 Status
Digital Input #11 Status
Digital Input #12 Status
Digital Input #13 Status
Digital Input #14 Status
Input Nº 7
Input Nº 8
Input Nº 9
Input Nº 10
Input Nº 11
Input Nº 12
Input Nº 13
Input Nº 14
Breaker Failure Logic
Hi-Set A Pickup
Hi-Set B Pickup
BF Logic = 3P
Output of Hi-Set current detector ph A
Output of Hi-Set current detector ph B
Output of Hi-Set current detector ph C
CC1 Dig. Input ON (default configuration)
CC2 Dig. Input ON (default configuration)
CC3 Dig. Input ON (default configuration)
Output of Lo-Set current detector ph A
Output of Lo-Set current detector ph B
Output of Lo-Set current detector ph C
CC7 Dig. Input ON (default configuration)
Output of Neutral current detector
Output of AND 16 in figure 1
Hi-Set C Pickup
50BF Pole A Initiate
50BF Pole B Initiate
50BF Pole C Initiate
Lo-Set A Pickup
Lo-Set B Pickup
Lo-Set C Pickup
50BF 3 Phase Initiate
50BF Neutral Initiate
Internal Arc A Pickup
Internal Arc B Pickup
Internal Arc C Pickup
3-9
3.10
3.11
3.12
3.13
3.14
3.15
Output of AND 17 in figure 1
Output of AND 18 in figure 1
Any BF signal is activated. Output of OR
7 in figure 1
Any unit (except Internal Arc) has tripped.
Output of OR 6 in figure 1
4.0
4.1
Pickup
Trip 1
Same as Trip 1 when 1 step is selected.
2nd stage when 2 steps are selected.
Output of AND 14 / 15 in figure 1
Trip from Internal Arc unit. Output of
Timer 4 in figure 1
4.2
4.3
Trip 2
Internal Arc
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
5.0
5.1
5.2
5.3
5.4
Phase A Trip
Phase B Trip
Phase C Trip
Three-Pole Trip with Current
Three-Pole Trip without Current
Second Stage Trip
Output of Timer 1 phase A in figure 1
Output of Timer 1 phase B in figure 1
Output of Timer 1 phase C in figure 1
Output of Timer 2 in figure 1
Output of Timer 3 in figure 1
Output of AND 14 / 15 in figure 1
5.5
5.6
5.7
5.8
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2. OPERATION LOGIC
Group
5.9
Status
Comment
5.10
5.11
5.12
5.13
5.14
5.15
6.0
6.1
6.2
6.3
Parallel EEPROM Alarm
Serial EEPROM Alarm
Out-of-Service
Failure in parallel EEPROM
Failure in serial EEPROM
Relay out of service
6.4
6.5
6.6
6.7
Default General Settings
Default Table 1 Settings
Default Table 2 Settings
Default Table 3 Settings
Relay with factory default settings
Table 1 with factory default settings
Table 2 with factory default settings
Table 3 with factory default settings
6.8
6.9
6.10
6.11
6.12
6.13
6.14
6.15
7.0
52 A Maintenance Alarm
52 B Maintenance Alarm
52 C Maintenance Alarm
Accumulated I2t above limit for Phase A
Accumulated I2t above limit for Phase B
Accumulated I2t above limit for Phase C
7.1
7.2
7.3
Active Table 1
Active Table 2
Active Table 3
Setting Table #1 is the active Table
Setting Table #2 is the active Table
Setting Table #3 is the active Table
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
New Events
Two Stages Set
Breaker Pole A Status
Breaker Pole B Status
Breaker Pole C Status
Latching Relay 1 Status
There are new events stored in the DBF
BF Logic set to 2 timed stages
CB Pole A Closed
CB Pole B Closed
CB Pole C Closed
Optional Exp. Board: Latched#1
Closed
7.12
7.13
7.14
7.15
8.0
Latching Relay 2 Status
Optional Exp.Boar: Latched#2 Closed
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
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2. OPERATION LOGIC
Group
8.9
Status
Comment
8.10
8.11
8.12
8.13
8,14
8.15
9.0
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
9.11
9.12
9.13
9.14
9.15
10.0
10.1
10.2
10.3
10.4
10.5
10.6
10.7
AND1
Output of internal AND gate #1
Output of internal AND gate #2
Output of internal AND gate #3
Output of internal AND gate #4
Output of internal AND gate #5
Output of internal AND gate #6
Output of internal AND gate #7
Output of internal AND gate #8
Output of internal AND gate #9
Output of internal AND gate #10
Output of internal AND gate #11
Output of internal AND gate #12
Output of internal AND gate #13
Output of internal AND gate #14
Output of internal AND gate #15
Output of internal AND gate #16
AND2
AND3
AND4
AND5
AND6
AND7
AND8
AND9
AND10
AND11
AND12
AND13
AND14
AND15
AND16
10.8
10.9
10.10
10.11
10.12
10.13
10.14
10.15
INTERNAL COMMUNICATION STATUS SIGNALS
Group
1.0
1.1
Status
Comment
Relay in remote mode
Rear communication port in use
Front communication port in use
Remote/Local Mode
Rear Connection
Front Connection
1.2
2.0
2.1
2.2
2.3
2.4
Date/Time alarm
Serial EEPROM Alarm
Comm. Settings
Protection Link
Synch. Signal not received in setting t Timeout
Failure in serial EEPROM
Relay with factory default settings
Status of internal comm. with protection CPU
Relay synchronized by IRIG_B
IRIG_B Link
3.0 - 3.15
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2. OPERATION LOGIC
Group
Status
Comment
4.0 - 4.15
5.0 -5.15
The DBF units are supplied with the following target LED’s default configuration:
LED
LEFT COLUMN
TRIP STAGE 1
LED
RIGHT COLUMN
LOW SET PICKUP
1
2
3
4
5
6
7
8
9
TRIP STAGE 2
PHASE A TRIP
PHASE B TRIP
PHASE C TRIP
3P TRIP NO I
10
11
12
13
14
15
16
50BF POLE A INIT
50BF POLE B INIT
50BF POLE C INIT
INT. ARC A POLE
INT. ARC B POLE
INT. ARC C POLE
INT. ARC TRIP
HIGH SET PICKUP
REMOTE COMMUNICATIONS
2.2.4 CIRCUIT BREAKER BREAKING CAPACITY MONITORING
To supervise the breaker health, the DBF system calculates and stores, for each operation, the accumulated
values of the square of the current multiplied by the opening time of the breaker (I2t) on each phase. I2t is
expressed in kA2 sec.
The value I2t is accumulated and stored independently for each phase. These values can be accessed either by
the local HMI or by the GE-LOCAL communications software.
The function has an Integration Time Selector setting (kI2t OP MODE) which can be used to assign a fixed
opening time (given by another setting (kI2t INT TIME)). Otherwise the unit measures the time between the
tripping signal of the main feeder protection and the change of the status contacts of the circuit breaker (52/b).
The total Breaking Current Limit (kI2t LIMIT) setting fixes the maximum life breaking capability (it is recommended
to set this to the limit supplied by the manufacturer). When this threshold is reached in any phase, the system
may be configured to close an output, if the appropriate internal signal (52 A Maintenance Alarm, 52 B
Maintenance Alarm, 52 C Maintenance Alarm) is assigned to an output. In addition, the system also has a
counter for the tripping operations.
The purpose of these functions is to provide accurate data to perform the circuit breaker maintenance, based on
the actual breaking time and current values. Once this maintenance operation has been done, the values for both
the I2t and number of opening operations, can be reset.
In order to be able to take into account the history of the breaker, in the case where the breakers were already in
use before the installation of the relay, the system allows to set an initial value for the I2t and the number of the
previous breaking operations. Similarly, these values can be adjusted to a given value in order to take into account
operations carried out during protection testing.
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2. OPERATION LOGIC
2.2.5 BUILT-IN SELF-CHECKING UNIT
The digital technology of the DBF system allows providing a built-in self-checking function which guarantees the
correct performance of the unit, and provides an external alarm in case of error detection.
Two built-in self-checking functions are performed, one when the unit is started up and the other during normal
operation. Internal tests are provided for power supply, program memory (ROM), working memory (RAM),
oscillography memory (RAM), and settings and calibration memory (EEPROM).
In addition, there is a hardware test for the Target LEDs, which lights them all up when the button TARGET
RESET is pressed. The sealed-in targets (latched) reset if the TARGET RESET button is kept pressed during
three seconds.
2.3. ANALYSIS FUNCTIONS.
The DBF system includes an event recorder and an oscillography waveform recorder with a resolution of 1 ms for
the first one, and 1 sample for the second one (1.04 ms at 60 Hz and 1.25 ms at 50 Hz). To avoid the loss of
date/time and oscillography records during any Vdc power failure, the unit is equipped with a capacitor, which
allows the information to be kept for at least 24 hours after power loss.
2.3.1 EVENT RECORDER.
The DBF system keeps a record of the last 144 events and stores for each one the following information: date and
time (accurate to one millisecond), the type of event, current RMS values during the event, and the state of the
unit (set of digital signals that describes the status of the relay at any given moment in time).
This event recorder is stored in a non-volatile memory and can be maintained indefinitely, even with no power
supply.
The list of events that the relay stores are factory fixed, and corresponds to standard relevant
situations/operations, like Settings Change, Program initiate, Active Table 1, Opening 52 phase C, Closing
52 phase C, Digital Input 1 Activated, etc.
2.3.1 OSCILLOGRAPHY
The DBF unit stores up to 4 oscillography records, with a resolution of 16 samples per cycle. Each record has a
maximum capacity of 66 cycles. The number of pre-fault cycles can be selected from 2 to 10 cycles. Each record
includes the following information:
•
•
•
•
•
Date and time.
Name of the signal that triggered the oscillography.
Active settings table when recording
Digital information (Status of internal digital signals)
Instantaneous rms values of currents (IA, IB, IC and IN)
A configurable mask is available for selecting which functions or internal signals are able to trigger the
oscillography. It can either be triggered by a configurable digital input, by a command received from the
communication program (GE_LOCAL), or directly from the HMI.
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2. OPERATION LOGIC
The user can select from the following list which signals may trigger the oscillography:
Events to Trigger the
Oscillography
PICKUP
1ST STAGE TRIP
2ND STAGE TRIP
INTERNAL ARC
50BF A TRIP
50BF B TRIP
50BF C TRIP
50BF 3P TRIP
EXTERNAL TRIGGER
COMM. TRIGGER
HI-SET A PICKUP
HI-SET B PICKUP
HI-SET C PICKUP
50BF A INIT
50BF B INIT
50BF C INIT
LO-SET A PICKUP
LO-SET B PICKUP
LO-SET C PICKUP
3 POLE 50BF INIT
NEUTRAL PICKUP
ARC A PICKUP
ARC B PICKUP
ARC C PICKUP
The oscillography records are retrieved from the relay to the computer in COMTRADE international standard
format using the GE_LOCAL communications program. To draw the waveforms, digital flags, phasors and post-
fault analysis in general, it is suggested to use the GE_OSC oscillography program or any other that accepts
COMTRADE international format (IEEE-C37.111-1991). It is also possible to import the waveforms with
mathematical or spreadsheet programs (for example EXCELTM).
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2. OPERATION LOGIC
2.4. CONTROL
2.4.1 TABLES OF SETTINGS
The DBF system has two types of settings stored in non-volatile memory (information is kept even when there is
no auxiliary voltage):
•
•
Generic Settings.
Specific Settings.
The Generic settings are grouped as follows:
GENERAL SETTINGS
BREAKER SETTINGS
ACTIVE TABLE SETTINGS
OSCILLOGRAPHY MASK
FUNCTION PERMISSION
For the specific settings, the DBF allows to have up to 3 independent setting tables. These specific settings are
grouped as follows:
50BF SETTINGS
INTERNAL ARC SETTINGS
Only one setting table is active at a given time, and this is the table used by the system to run the different
functions included in it.
There is an "ACTIVE TABLE" setting that determines the settings table that is active at a given moment.
The active settings table can be changed by means of up to 2 digital inputs, referred to as "ACTIVE TABLE
SELECT 0" and "ACTIVE TABLE SELECT 1" which allow up to 4 combinations from 0 to 3. To do this it is
necessary to configure (using GE-INTRO software) two inputs to have these meanings. For applications which
require less tables (up to 2) it is possible to use only one input.
The selected combination is obtained from the binary coding of the 2 inputs mentioned (see following table). The
0-0 means selecting the table indicated in the "ACTIVE TABLE" setting, and numbers 0-1 to 1-1 select tables 1 to
3 respectively
Table Selection
Table Selection
Active Table
INPUT-1
INPUT-0
0
0
1
1
0
1
0
1
Selected by setting
1
2
3
NOTE: if the inputs are programmed and used, energizing them, this selection has priority over the "ACTIVE
TABLE" setting and the table which is in fact used is determined by the status of the digital inputs.
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2. OPERATION LOGIC
2.4.2 TIME SYNCHRONIZATION.
The DBF system includes an input for time synchronization. This input requires the connection of a device
to supply a demodulated IRIG-B output. In this way coordinated universal time is measured to a high degree of
accuracy and makes possible to tag events generated by the unit with a resolution of one millisecond.
The use of this input makes it possible to correlate data obtained from different units thanks to
synchronization with GPS satellites. In this way it is possible to obtain very useful information for analysis, cross-
referencing the information provided by different units for a given incident.
Alternatively, it is possible to synchronize units by means of communications, using the GE-LOCAL
communications software, or manually by means of the HMI. If the IRIG-B input is used it has priority over time
setting by communications, since the time read by IRIG-B is much more accurate.
2.4.3 CONFIGURABLE INPUTS AND OUTPUTS
2.4.3.1 Digital Inputs
The DBF system has 6 digital inputs (two groups of 3 inputs with one common in each group). The inputs
can be configured by the user by means of the GE-INTRO configuration program. Using the optional expansion
board it is possible to increase the number of inputs up to a total of 14 (2 groups of 3 inputs with one common in
each group and 4 groups of 2 inputs with one common in each group). See the external connections diagram for
additional reference.
One of the following meanings can be assigned to any input: (For more detail about the configuration of the
inputs, see GE-INTRO Instruction Book).
Function
P/L
Unused input
50BF Initiate A
50BF Initiate B
50BF Initiate C
3P BF Initiate
52a pole A
52a pole B
52a pole C
52b pole A
52b pole B
52b pole C
Latching Relays Reset
External Trigger
Active Table Select 0
Active Table Select 1
L
L
L
L
L
L
L
L
L
L
P
P
L
L
(L) indicates Level input
(P) indicates Pulse input
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2. OPERATION LOGIC
2.4.3.2 Outputs
The basic DBF system has 10 outputs as follows:
•
•
•
•
•
2 tripping contacts (A12-B12 and C1-D1)
1 Breaker failure pickup signaling (A11-B11)
1 Internal arc detection (C2-D2)
1 Equipment alarm (C3-D3)
5 configurable contacts (C4-D4 to C8-D8)
The optional expansion board for the DBF provides 6 additional latched contacts (E1-F1 to E6-F6). This outputs
are not configurable and are assigned as follows:
•
•
3 tripping contacts (TRIP 1st Stage) (E1-F1 to E3-F3)
3 tripping contacts (TRIP 2nd Stage) (E4-F4 to E6-F6)
The configurable outputs can be programmed using logic based on the internal protection states (pick-ups, trips,
alarms, etc.). The DBF has 66 different internal states, and these can be used to carry out logical operations NOT,
AND and OR, which gives the unit a great flexibility.
The output configuration is done using different levels. At the first level it is possible to use AND gates of up to 16
signals. The output is incorporated into the states matrix so that it can then be used in other AND gates of up to 16
inputs. This process can continue until the 16 ANDs are used.
Once the AND gates have been configured it is possible to create a second level with OR gates of 16 inputs
limited to the established groups of bytes, and whose logical outputs are assigned to physical outputs of the unit.
This means that we can configure the physical outputs with any internal signal from the status or any combination
of them made by means of the AND logic gates.
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2. OPERATION LOGIC
2.5. MAN-MACHINE INTERFACE (HMI)
The DBF system includes as standard a 20 key keyboard and a 2-line liquid crystal display (LCD) with 16
characters per line. This display has highly reliable LED diode back lighting (the screen brightness can be adjusted
on the rear of the front board).
By means of this interface the user can change the settings, display measurements, carry out operations
and access information stored in the unit. The functions of this local interface and how to use it are described in
the section KEYBOARD AND DISPLAY.
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2. OPERATION LOGIC
2.6. REMOTE COMMUNICATIONS
The relay has 2 serial gates and three connectors. Gate 1 can be reached from the front of the relay in connector
1 (PORT 1 connector) or from the rear (PORT 2 connector). The second gate can be reached from connector 3
(PORT 3 connector) which is located on the rear.
There are different models, each with a different physical connection for the PORT 3 connector (RS-232/RS-485
or fiber-optic). In the "RS232" models the three connectors are RS232. In the "RS232 and fiber-optic" models the
PORT1 and PORT2 connectors are RS232 while the PORT3 connector is replaced by a fiber-optic connector.
The PORT 1 connector has priority over the PORT 2 connector and is selected when the DCD (Data Carrier
Detect) signal is activated. Figure 8 shows how to make the connections to a personal computer.
Gate 1 (PORT 1 and PORT 2 connectors) and 2 (PORT 3 connector) are independent and the unit can serve
them simultaneously.
The communications protocol is the same used for the rest of the GE digital protection systems and requires the
use of the GE-LOCAL software. PORT 3 protocol can be chosen between M-LINK and ModBus RTU. The
protocol is highly reliable and allows communication with different protection systems. It guarantees very efficient
data transfer (especially for the oscillography and other large files) along with error detection and automatic
communication recovery.
The status of the local/remote communication is indicated on the front of the unit by LED indicator 16 (the last LED
in the right-hand column, according to the default configuration.) Local communication refers to communication via
the keyboard/display (local display showing any information except for the initial DBF GENERAL ELECTRIC
screen), or via communications gate 1 (PORT 1, PORT2 connectors), and remote communication refers to
connection via gate 2 (PORT 3 rear connector).
Local and remote communications can exist at the same time, although there is only one possibility for changing
settings and carrying out operations, since this can only be done with the communication which has priority (local
communication) while the other is limited only to accessing information. When the local communication is
interrupted, either by the disconnection of PORT 1 connector or because the HMI is on the initial screen (a
situation which can be caused intentionally, or automatically if no key has been pressed for 15 minutes), the
remote communication recovers the ability to modify settings and carry out operations.
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3. SETTINGS
3.
SETTINGS
This section describes the settings of the DBF relay and the procedure to modify them. Table 3 shows the list of
DBF settings, their range and resolution, and the factory default settings.
To view or to modify settings using the GE_LOCAL program connected to PORT 1, PORT 2 or PORT 3 the user
has to perform the following steps:
•
Check that the available connection cable is in accordance with the diagram in Figure 7.
Check correspondence between DB-9 connector in the cable with available connector at PC
port (could be DB-9 or DB-25)
•
•
Connect the cable between the relay (or modem) and the serial port of your computer.
Run the GE-LOCAL software. For more details on the installation and use of the GE-LOCAL
software see instruction book GEK-105568.
•
Make sure that the communication parameters in GE_LOCAL match with those set on the
DBF. Specifically, the parameters on the configuration of the local HMI are:
∗
∗
COMMUNICATION SPEED: On the relay depending on whether communication is:
through PORT 1 or PORT 2 (means LOCAL), or PORT 3 (means NET)
STOP BIT: Stop-bit corresponding to each one of the communication ways: LOCAL or
NET
To modify or view the DBF communication parameters refer to Chapter 8, Section 8.1 “Menu Tree”.
IMPORTANT: It should be noted that in order to simplify the setting of the unit and for safety reasons, all settings
related with the configuration of the unit (configurable inputs and outputs, internal status events and target LED’s)
have been removed from the HMI facilities and also from the communications software GE_LOCAL. To perform
these configurations the GE_INTRO software (described in instruction book GEK-105569) must be used.
TABLE 3. Settings Table
Common to all tables
Range
Default
Step
General Settings Group
In/out of service
20 ASCII characters
50 / 60 Hz
Relay status
Identification
Frequency
Phase CT Ratio
Neutral CT Ratio
In-service
No ID
50 Hz
1
1-4000
1-4000
1
1
1
Breaker Setting Group
4 ASCII characters
Fixed-Measured
0.03-0.25s
Breaker Number
0000
Fixed
0.06s
99999
kI2t Operation Mode
Integration Time for kI2t
kI2t Maximum Limit
0.01s
1
1-999999
Active table setting group
Active setting table #
1 - 3
1
1
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3. SETTINGS
Common to all tables
Range
Default
Step
Oscillography Mask
2-10
Prefault Cycles
Arc Detection
Pickup
4
1
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable-Disable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
Enable
1st Stage trip
2nd Stage Trip
50BF A Trip
50BF B Trip
50BF C Trip
50BF 3P Trip
External Trigger
Communications Trigger
Hi-Set A Pickup
Hi-Set B Pickup
Hi-Set C Pickup
50BF A Init.
50BF B Init.
50BF C Init.
Lo-Set A Pickup
Lo-Set B Pickup
Lo-Set C Pickup
3P 50BF Init.
Neutral Pickup
Arc A Pickup
Arc B Pickup
Arc C Pickup
Functions Permitted
Permitted-Non-Permitted
Permitted-Non-Permitted
Permitted-Non-Permitted
50BF 1P function
50 BF 3P Function
3P No I Function
Non-Permitted
Non-Permitted
Non-Permitted
Independent for each table
Range
Default
Step
50BF Settings
PH Hi-Set Pickup
PH Lo-Set Pickup
Neutral Pickup
1 Phase Timer T1
3 Phase Timer T2
3P No I Timer T3
BF Logic (3P/2P)
Severe Fault 3P
Low Load 2P
1-12A
1-12A
0.50-6A
0.05-2s
0.05-2s
2A
1A
1A
0.5s
0.01A
0.01A
0.01A
0.01s
0.01s
0.01s
1s
0.05-2s
2s
2-Phases
Non-Permitted
Non-Permitted
1
2-Phases/3 Phases
Permitted-Non-Permitted
Permitted-Non-Permitted
1-2
Output Stages number
2nd Stage Timer
1
0.05-2s
2s
0.01s
Internal Arc Settings
0.05-1A
Internal Arc Pickup
Internal Arc Timer
1A
1s
0.01A
0.01s
0.10-2s
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3. SETTINGS
COMMENTS ON SETTINGS:
1. The Identification setting allows the user to input a name for the unit (for example the name of the line or
feeder) with a maximum of 20 ASCII characters.
2. The Active Table setting allows selecting the table to be active during normal operation among the three
tables available on the DBF. This selection can also be done by means of digital inputs configured for this
purpose. The table input selection has priority over the table setting selection (if the input has been configured
to perform change of tables).
2
3. To set the breaker monitoring function it is necessary to set first the kI t OP. Mode setting. If this is selected
as "measured" no other setting is required, since the time used for the calculation is the time taken by the unit
during the interval: trip order-52/b contact to close. If the “fixed” mode is selected it is necessary to set then the
2
kI t Integration Time. In this case the time used will be always the set time (should be the rated operating
time of the circuit breaker provided by the manufacturer).
4. The Pre-Fault Cycles to be shown in every oscillography record may be adjusted from two to ten (2-10). In
any case the total number of cycles for any oscillography record is 66, regardless of pre-fault cycles setting.
5. The difference between the function permission and permitted trips settings is:
•
•
The function permission setting enables or disables the function
The trip permission setting allows to enable or disable any specific function to trip, but keeping always
active the function, providing thus capability to generate events, alarms and signals.
6. The overcurrent ranges shown in Table 3 correspond to models of 1-12A for phase and 0.5-6A for ground for
5A rated CT’s. Only PH Lo-Set Pickup, PH Hi-Set Pickup and Neutral Pickup settings change with the
range.
7. Sometimes the names used to describe the settings for both the local HMI and the communications program
are short or abbreviated. This is because of the space limitation imposed by text windows in the program.
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3. SETTINGS
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4. TECHNICAL CHARACTERISTICS
4.
TECHNICAL CHARACTERISTICS
4.1. MODEL LIST
Position DBF
1
-
-
-
-
1
1
-
-
0
0
A
Description
Comm. Interface
P2: RS232 + P3: RS232
P2: RS232 + P3: Plastic F.O.
P2: RS232 + P3: Glass F.O.
P2: RS232 + P3: RS485
Ranges
0
1
2
3
5
6
[1]
See Table [1R]
Comm. Protocols
P1, P2, P3: Mlink
P1, P2: Mlink; P3: ModBus
Language
7
1
2
Spanish
English
8
M
D
Model
Basic Model
Enhanced Model (Expansion
board)
11
0
1
Power Supply
48-125 VDC
110-250 VDC
12
G
H
13,14
15
0
0
Special Models
Revision
A
TABLE [1R] - RANGES
MODELS
A
B
C
D
E
F
G
1-12 A
1-12 A
0.2-2.4 A
1-12A
1-12 A
0.5-6 A
1-12 A
0.5-6 A
0.5-6 A
DBF
PHASE
0.2-2.4 A 0.2-2.4 A
0.1-1.2 A 0.2-2.4 A 0.1-1.2 A
GROUND
4.1.1. SPECIAL MODELS
The input voltage of the standard model corresponds to the Power Supply voltage. The following models have
been developed to allow the selection of an input voltage independently of the Power Supply.
The following codes should be placed as two last digits before A in the ordering code for selecting the desired
characteristics:
MOD 04:
MOD 05:
MOD 06:
MOD 07:
V inputs: 48 Vdc ±20%
V inputs: 110 Vdc ±20%
V inputs: 125 Vdc ±20%
V inputs: 250 Vdc ±20%
Example: If we want to order a relay model with a digital input voltage of 48 Vdc, the model should be:
DBF1*****11**04A.
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4. TECHNICAL CHARACTERISTICS
4.2. TECHNICAL CHARACTERISTICS
MECHANICAL
•
•
•
•
•
•
Metal 19” rack case, 2 units high
IP51 Protection (as per IEC 529)
Local HMI: LCD (2 rows, 16 characters) and 20 key keyboard
Rear connection for wiring: 4 blocks, 12 terminals each (6 blocks when optional expansion board)
Dimensions: 437 x 164 x 88 mm
Weight: Net 6 kg. Shipping 7 kg.
ELECTRICAL
•
•
•
•
•
Frequency:
Rated current:
DC Power Supply
Operational range
Digital Input Voltage
50 or 60 Hz (selectable by setting)
1 or 5 A (different models)
48/125 Vdc or 110/250 Vdc (different models)
80% to 120% of rated values
For standard models: 48-125, 110-250 VDC
(according to selected model). For special models,
please refer to section 4.1.1.
•
Thermal Capacity
Current circuits
- Permanent
- 3s duration
- 1 s duration
Temperature ranges
-Operation
4 x In
50 x In
100 x In
•
-20º C to + 55ºC
-Storage
-40ºC to + 70ºC
•
•
Humidity
Trip contacts:
Up to 95% without condensation
AC
-Continuous Capacity
-Rated Breaking Capacity
-Make
16A
4000VA
25A for 4 sec
8 ms or less
-Operating Time
DC Breaking Capacity
- Resistive
9A at 30V
- Resistive
- Inductive(L/R=40 ms)
0.65A at 100V
0.5A at 30V
•
•
Burden
-Current circuits
0.5 VA at Ir = 5 A
0.1 VA at Ir = 1A
Consumption:
-At DC rated voltage
12 W idle state
16 W all relays activated
8 mA (1 W at Vrated = 125 VDC)
-Digital inputs
Accuracy
•
•
-Current
-Time
- Error index
Repeatability
-Operating value
-Operating time
5%
5% or 30ms (whichever is greater)
Class E-5 as per IEC 255-4
1%
2% or 30 ms (whichever is greater)
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4. TECHNICAL CHARACTERISTICS
COMMUNICATIONS
-RS232 using DB9 female connector (2/3 connectors depending on model)
- Mode: Half duplex
-1 mm plastic fiber-optic (depending on model)
Typical power output :
Receiver sensitivity
Numeric aperture N.A.
Wave length
-8dBm
-39dBm
0.5
660 nm (visible red)
HFBR-4516 type connector
-Glass fiber-optic 62.5/125 (depending on model):
Typical power output:
Receiver sensitivity
Numeric aperture N.A.
Wave length
-17.5 dBm
-25.4 dBm
0.2
820 nm (near infrared)
SMA type connector
STANDARDS
The DBF system complies with the following standards, which include the GE insulation and electromagnetic
compatibility standard and the standards required by Community Directive 89/336 for the EC market, in line with
European standards. It also complies with the European directive requirements for low voltage, and the
environmental and operating requirements established in ANSI standards C37.90, IEC 60255-5, IEC 60255-6 and
IEC 68.
Test
Standard
Class
Insulation test voltage
IEC 60255-5
600V, 2kV
50/60 Hz 1 min.
IEC 60255-5
Impulse voltage
5kV,0.5 J
1 MHz interference
Electrostatic discharge
IEC 60255-22-1
IEC 60255-22-2
EN 61000-4-2
IEC 60255-22-3
ENV 50140
III
IV
8kV
III
10 V/m
Immunity to radio interference
•Electromagnetic fields radiated with
amplitude modulation
•Electromagnetic fields radiated with
amplitude modulation. Common mode
•Electromagnetic fields radiated with
frequency modulation
ENV 50141
ENV 50204
10 V/m
10 V/m
IV
•Fast transients
IEC 60255-22-4
EN 61000-4-4
EN 61000-4-8
•Magnetic fields at industrial
frequency
•RF emission
30 Av/m
B
EN 55011
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5. HARDWARE DESCRIPTION
5.
HARDWARE DESCRIPTION
CAUTION
The DBF contains electronic components that can be damaged by electrostatic discharge if currents flow
through some terminals of the internal components. The main source of electrostatic discharge currents
is the human body, especially in conditions of low humidity, carpeted floors and isolated footwear. Under
these conditions it is important to have special care when removing and handling the modules or some of
their internal components. Personnel handling the relay should check that their body is free from
electrostatic charge, either by touching a surface at ground potential or by using an electrostatic
wristband connected to earth.
5.1. PHYSICAL DESCRIPTION
5.1.1. CASE
The DBF case is made of stainless steel and consists of the main body and a covering lid. The main body of the
case contains the blocks of terminals necessary to carry out the external connections and guides to support the
trays that contain the internal parts of the relay. The trays can be pulled out in order to make easy the
maintenance and servicing of the relay.
5.1.2. ELECTRICAL CONNECTIONS
All the electrical connections for current channels, digital input and output relays are made using the terminal
blocks fixed to the rear part of the case. The connections required for communications are made using three DB-9
serial connectors, one on the front and two on the rear when using communication option RS-232. One of these
connectors is replaced by the corresponding fiber-optic connector in models including this option.
5.1.3. INTERNAL CONSTRUCTION
Internally the DBF unit is divided into 2 trays and a case. The case with the blocks of terminals is described above.
The lower tray carries the magnetic module and a printed circuit board which contains the power supply, the digital
inputs and also the trip outputs and auxiliary outputs on the basic version (model without expansion board).
The upper tray carries the board with the protection system CPU and the communications. This tray can also carry
as an option the input and output expansion board.
The front panel consists of a covered keyboard and a board which carries the alphanumeric display, the LEDs and
the Reset button. The model number (see list of models in Chapter 4) and the technical characteristics of the unit
are situated on the front panel of the relay.
The 16 indicator LEDs can be identified using labels which can be placed beside them, inside available plastic
holders.
A frontal bus is responsible for the connections between the lower and upper trays described above. Both trays
can be pulled out. To do so you first have to release the front panel which is fixed to the case with two screws and
pull it out, removing the flat cable which connects it to the CPU. It is then possible to remove the frontal bus.
The blocks of terminals situated on the rear of the case are identified with the letters A, B, C and D, and optionally
E and F, as shown in figure 9. In addition, each terminal is identified with a number.
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5. HARDWARE DESCRIPTION
The communications connectors are situated on left-hand side of the front and on the right-hand side of the rear of
the case. The front port is PORT 1 and the rear ports are PORT 2 and PORT3. The IRIG-B connection is made
using a block of two additional terminals.
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5. HARDWARE DESCRIPTION
5.2. OPERATING THEORY
The DBF unit measures current signals, performs complex calculations using internal data, stores relevant
incidents, pick-up tripping relays and generates information that can be used to determine the state of the
associated electrical system. The DBF functionality is related to the following modules:
- Magnetic module
- CPU board
- Power supply
- Keyboard and display
5.2.1. MAGNETIC MODULE
The magnetic module performs two essential functions: galvanic insulation and scaling analog input signals. In the
case of current transformers the input current for the primary winding is converted into a scaled voltage in the
secondary winding. Each current transformer must be linear in the whole measurement range of the relay.
5.2.2. CPU BOARD
The DBF uses two 16-bit microprocessors operating at a clock frequency of 20 MHz. One of these
microprocessors is used to perform the relay communications and the other performs the necessary calculations
for protection functions. In general the microprocessors are responsible to perform the input and output
calculations and operations at very high speed. The use of two microprocessors is especially recommendable to
make the protection and communication functions independent of each other inside the unit itself, and therefore
increase the reliability of the system.
The analogue-digital converter converts the voltage inputs into their digital equivalent with a resolution of 10 bits.
The unit code is stored in non-volatile EPROM memory while the settings and events are stored in EEPROM
memory. The data related to the oscillography is stored in RAM memory which is maintained using a capacitor,
thus avoiding the loss of information when the unit is disconnected.
A high-resolution real time clock is used to ensure that the date and time of all incidents can be time-tagged, with
a resolution of one millisecond. This clock can be synchronized externally using an IRIG-B demodulated signal..
The input and output functions are divided between the two microprocessors. The serial ports, the keyboard and
the display are controlled by the communications microprocessor. External communications are processed by a
serial communications controller circuit which contains a universal asynchronous transceiver (DUART). The digital
inputs and outputs are processed by the protection microprocessor.
The DBF contains 6 independent circuits to process digital inputs. These circuits check the presence or absence
of input voltage and are designed to isolate them electrically from the microprocessor, thus increasing the
reliability of the system.
On the front of the relay there is a set of 17 Target LED’s, one of which is fixed and indicates the operating state of
the unit. The rest are user-configurable using GE_INTRO software.
The button situated on the front is designed to check the state of the Target LED’s and to reset them by keeping it
pressed during 3 seconds.
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5. HARDWARE DESCRIPTION
5.2.3 POWER SUPPLY
The DBF power supply can be 48-125 VDC or 110-250 VDC rated. The operating margin of the power supply is +
20%, and is galvanically isolated from the rest of the relay's circuits. The power supply provides ± 12 VDC to the
analog circuitry and the output relays, and ± 5 VDC for the digital circuits.
5.2.4 KEYBOARD AND DISPLAY
The DBF display at the front of the relay is liquid crystal type and consists of two rows of 16 characters each. The
display has background light with variable lightness adjustable by a potentiometer located on the rear of the front
cover plate.
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6. ACCEPTANCE TESTS
6.
ACCEPTANCE TESTS
6.1. CONNECTIONS AND NECESSARY EQUIPMENT
Necessary equipment:
•
•
•
•
One current source
One DC voltage source
Precision timer for testing timed events
One AC/DC voltmeter/ammeter
Connect the relay as indicated in the external connections diagram, Figure 2.
For safety reasons, the external protection earth should be securely grounded.
Apply dc rated voltage to terminals A10-B10
6.2. VISUAL INSPECTION
Check that the relay has not suffered any kind of damage due to transport and handling.
Check that all the screws are tight and the terminal blocks have not been damaged in any way.
6.3. PANEL INSULATION TESTS
!
If any insulation test would be performed on the panel where the relay is installed, the ground terminals
A9-B9 must remain ungrounded.
Do the following groups in the terminals of the relay:
Group 1: A10, B10
Group 2: A1 to A4, B1 to B4
Group 3: C9, C10, D9, D10, C11, C12, D11, and D12
Group 4: A11, B11, A12, and B12
Group 5: C1, D1, C2, D2, C3, and D3
Group 6: C4, C5, C6, C7, C8, D4, D5, D6, D7, and D8
If the relay has expansion board, then the following groups must be added:
Group 7: E7, F7, E8, F8, E9, F9, E10, F10, E11, F11, E12, and F12
Group 8: E1, F1, E2, F2, E3, F3, E4, F4, E5, F5, E6, and F6
Apply 2000V gradually between case and groups.
Apply 2000V gradually between groups.
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6. ACCEPTANCE TESTS
6.4. RELAY SETTING
Introduce the following settings in the relay (by means of HMI or GE_Local software):
General Settings Group
Relay Status
Identification
Value
IN SERV
N/A
Frequency
Phase CT Ratio
Neutral CT Ratio
50 Hz / 60 Hz
1
1
Breaker Settings
Value
N/A
Breaker Number
KI2t Op. Mode
KI2t INT. Time
KI2t LIMIT
Active Table Set
Active Table
Function Permit
50BF 1P Function
50BF 3P Function
3P NO INT Funct
Fixed
0.06s
99999
Value
1
Value
No Per
No Per
No Per
Value
2A
50BF Settings Table 1
PH Hiset Pickup
PH Loset Pickup
Neutral Pickup
1A
1A
1 Phase Timer T1
3 Phase Timer T2
3P No I Timer T3
BF Logic (3p/2P)
Severe Fault 3P
Low Load 2P
Nº Output Stages
2nd Stage Timer
Internal Arc Settings Table 1
Int Arc Pickup
1s
1s
2s
2 PHASE
Per
No Per
1
2s
Value
1A
Int Arc Timer
1s
The specific settings required for each test are indicated; other settings do not affect the tests.
6.5. INDICATORS
Check that pressing the TARGET RESET button (with relay fed with rated dc power supply) all target LEDs light
up.
6.6. POWER SUPPLY
The relay operates with a dc power supply within ± 20% of the rated value. Check that the READY target LED in
the front of the relay lights up showing green color.
1. Apply dc rated voltage to terminals A10-B10
2. Change setpoint FUNCTION PERMIT/50BF 1P FUNCTION to PERM.
3. Apply 2A to terminals A1-A2.
4. Energize digital input CC1 PHASE A BF INITIATE (C9-D10).
5. Wait 1second.
6. Check that the READY target LED in the front of the relay lights up showing green color.
7. Check the dc burden (see table below)
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6. ACCEPTANCE TESTS
8. Remove the current from terminals A1-A2. Remove voltage from digital input CC1.
9. Repeat these steps with minimum and maximum voltages depending on the range of the relay.
Test voltages and typical burdens are listed below:
Model "G" (48/125 VDC)
DC Battery (mA)
Voltage (Vdc) Without Expansion Board With expansion Board
38
125
150
340
250
225
440
320
300
Model "H" (110/250 VDC)
DC Battery (mA)
Voltage (Vdc) Without Expansion Board With expansion Board
88
110
300
300
250
150
370
320
220
6.7. COMMUNICATIONS
The object of this test is to check the communication ports of the relay (PORT1, PORT2 and PORT3). To do this
it is necessary to use a computer and the communications software GE_LOCAL. Figure 7 shows the series cable
and connection accessories necessary to establish the connection between the PC and the relay. Figure 8 shows
the cable and connectors necessary for remote connection (by MODEM) through PORT3.
The PC communication parameters necessary to match the relay default setting parameters are:
Relay number:
1
Remote port speed:
Local port speed:
Remote stop bit:
Local stop bit:
19200
19200
1
1
By using GE_Local communications software establish the connection and check that the relay communicates
through the three communication ports. Repeat this test with different baud rates and different power supply
voltages.
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6. ACCEPTANCE TESTS
6.8. INPUTS
6.8.1 DIGITAL INPUTS
Log into the relay using the GE_LOCAL software and press INPUTS / OUTPUTS button on the first general
screen.
•
Check that applying dc rated voltage between terminals:
C9
D9
C10
C11
D11
C12
and
and
and
and
and
and
D10
D10
D10
D12
D12
D12
(CC1)
(CC2)
(CC3)
(CC4)
(CC5)
(CC6)
their corresponding status windows turn red while the applied voltage remains present.
If the relay has the optional expansion board, check the same for the following contact converter inputs:
E7
F7
E9
F9
E10
F10
E12
F12
and
and
and
and
and
and
and
and
E8
E8
F8
F8
E11
E11
F11
F11
(CC7)
(CC8)
(CC9)
(CC10)
(CC11)
(CC12)
(CC13)
(CC14)
6.8.2 IRIG-B SYNCHRONIZING INPUT
Connect the output of an IRIG-B unit with decoded output to the IRIG-B input at the rear of the DBF. Special care
must be taken when making the connection because the input is polarized.
Check that the time measured by the two units is the same.
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6. ACCEPTANCE TESTS
6.9.1 50BF 1P UNIT TEST
6.9. FUNCTIONS
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to NO PER.
3. Change setpoint TABLE 1/FUNCTION PERMIT/3P No INT FUNCT to NO PER.
4. Change setpoint 50BF SETTINGS/Nº OUTPUT STAGES to 2.
5. The precision timer will be started at the same time than the corresponding contact converter (digital input) is
energized. The timer stop input will be wired to any DBF contact under test, i.e. contact C4-D4.
6. Apply 2A to terminals A1-A2 (phase A).
7. Energize digital input CC1 PHASE A BF INITIATE (terminal C9-D10).
8. Check that after T1 time delay (1s), the following contacts are closed:
A12-B12
C4-D4
C5-D5
In case the relay under test includes an expansion board, check also the operation of the following contacts:
E1-F1
E2-F2
E3-F3
9. Check that after 2nd Stage Timer delay (2s), the following contacts are closed:
C1-D1
C6-D6
C7-D7
and if the relay is equipped with an expansion board also the following contacts must be closed:
E4-F4
E5-F5
E6-F6
10. Repeat steps 7, 8, 9 and 10 using phase B current (B1-B2 terminals) and CC2 PHASE B BF INITIATE (D9-
D10 terminals) to start the breaker failure operation.
11. Repeat steps 7, 8, 9 and 10 using phase C current (A3-A4 terminals) and CC3 PHASE C BF INITIATE (C10-
D10 terminals) to start the breaker failure operation.
12. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1.
13. Repeat steps 7 to 12 to check that in this case contacts C1-D1, C6-D6, C7-D7, E4-F4, E5-F5 and E6-F6 close
at the same time than contacts: A12-B12, C4-D4, C5-D5 and E1-F1, E2-F2, E3-F3 (if an expansion board is
available).
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6. ACCEPTANCE TESTS
6.9.2 50BF 3P UNIT TEST
The DBF relay outputs are factory set with the default settings shown in the external connections drawing (Figure
2).
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to NO PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to PER.
3. Change setpoint GENERAL/FUNCTION PERMIT/3P No INT FUNCT to NO PER.
4. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 2.
5. Change setpoint TABLE 1/50BF SETTINGS/BF Logic (3P/2P) to 3 PHASE.
6. The precision timer will be started at the same time than the corresponding contact converter (digital input) is
energized. The timer stop input will be wired to any DBF contact under test, i.e. contact C4-D4.
7. Apply 3A to terminals A1-A2 (phase A), B1-B2 (phase B) and A3-A4 (phase C).
8. Energize digital input CC7 3 POLE BF INITIATE (if the relay has not an expansion board, energize digital
inputs CC1 PHASE A BF INITIATE and CC2 PHASE B BF INITIATE simultaneously).
9. Check that after T2 time delay (1s), the following contacts are closed:
A12-B12
C4-D4
C5-D5
10. Check that after 2nd Stage Timer delay (2s), the following contacts are closed:
C1-D1
C6-D6
C7-D7
11. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1.
12. Repeat steps 8 to 9. Check that after T2 time delay (1s), all the contacts are closed:
A12-B12
C4-D4
C1-D1
C6-D6
C7-D7
C5-D5
13. Change setpoint TABLE 1/50BF SETTINGS/BF LOGIC (3P/2P) to 2 PHASE.
14. Apply 3A to terminals B1-B2 (phase B) and terminals A3-A4 (phase C).
15. Energize digital inputs CC2 PHASE B BF INITIATE and CC3 PHASE C BF INITIATE.
16. Check that after T2 time delay (1s), the following contacts are closed:
A12-B12
C4-D4
C1-D1
C6-D6
C7-D7
C5-D5
17. Repeat steps 15 to 17 choosing any other pair of phases to apply ac current and any other pair of BF initiation
inputs.
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6. ACCEPTANCE TESTS
6.9.3 INTERNAL ARC TEST
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to NO PER.
2. Change setpoint TABLE 1/INTERNAL ARC SETTINGS/INT ARC TIMER to 2s.
3. Energize digital input CC4 52/b A
4. Apply 2A to terminals A1-A2 (phase A).
5. Check that after INT ARC TIMER time delay, contact C2-D2 is closed.
6. Repeat steps 3, 4 and 5 for phases B (terminals B1-B2) with digital input CC5 52/b B and C (terminals A3-A4)
with digital input CC6 52/b C.
6.9.4 3P NO I FUNCTION
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to NO PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to NO PER.
3. Change setpoint GENERAL/FUNCTION PERMIT/3P No INT FUNCT to PER.
4. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1
5. Change setpoint TABLE 1/50BF SETTINGS/ 3P NO I TIMER T3 to 1s
6. Change setpoint TABLE 1/50BF SETTINGS/LOW LOAD 2P to PER.
7. Energize digital input CC7 3P BF INITIATE. If the relay has not an expansion board, energize CC1 PHASE A
BF INITIATE and CC2 PHASE B BF INITIATE.
8. Check that after 3P NO I TIMER T3 (2s), the following contacts are closed:
C4-D4
C5-D5
C6-D6
A12-B12
C1-D1
C7-D7
9. If the relay is provided with an expansion board, check that also the following contacts are closed:
E1-F1 E2-F2
E3-F3 E4-F4
E5-F5 E6-F6
6.9.5 NEUTRAL OVERCURRENT UNIT TEST
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to NO PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to NO PER.
3. Change setpoint GENERAL/FUNCTION PERMIT/3P No INT FUNCT to PER.
4. Change setpoint TABLE 1/50BF SETTINGS/LOW LOAD 2P to PER.
5. Energize digital inputs CC4, CC5 and CC6 (52b inputs).
6. Energize digital inputs CC7 3P BF INITIATE. If the relay has not an expansion board, energize digital inputs
CC1 PHASE A BF INITIATE and CC2 PHASE B BF INITIATE.
7. Apply 2A to terminals B3-B4 (neutral).
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6. ACCEPTANCE TESTS
8. Check that after 3P NO I TIMER T3 (2s), the following contacts are closed:
A12-B12
C4-D4
C1-D1
C6-D6
C7-D7
C5-D5
9. If the relay is provided with an expansion board, check that also the following contacts are closed:
E1-F1
E3-F3
E5-F5
E2-F2
E4-F4
E6-F6
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6. ACCEPTANCE TESTS
6.10. RELAY MEASUREMENT TESTS
6.10.1. CURRENT MEASUREMENT
1. Change setpoint GENERAL/FUNCTION PERMIT/50BF 1P FUNCTION to PER.
2. Change setpoint GENERAL/FUNCTION PERMIT/50BF 3P FUNCTION to NO PER.
3. Change setpoint GENERAL/FUNCTION PERMIT/3P No INT FUNCT to NO PER.
4. Change setpoint TABLE 1/50BF SETTINGS/PH LOSET PICKUP to 5A (1A in relays with 1A nominal current).
5. Change setpoint TABLE 1/50BF SETTINGS/1 PHASE TIMER T1 to 0.050s.
6. Change setpoint TABLE 1/50BF SETTINGS/Nº OUTPUT STAGES to 1.
7. Energize digital input 3POLE BF INITIATE (terminals E7-E8 for relays with expansion board). If the relay has
not expansion board, energize CC1 PHASE A BF INITIATE.
8. Increase current applied on A1-A2 (phase A) until contact A12-B12 closes. Check that the operating value of
the current is within ± 5% of setpoint (5A for relays with 5A nominal current and 1A for 1A nominal current
relays).
9. Repeat step 8 applying current on B1-B2 (phase B). If the relay has not an expansion board energize CC2
PHASE B BF INITIATE.
10. Repeat step 8 applying current on A3-A4 (phase C). If the relay has not an expansion board energize CC3
PHASE C BF INITIATE.
6.10.2. TIMING MEASUREMENT
1. Connect the stop input of the precision timer to the A12-B12 output (trip 1).
2. Apply the operating current level of the previous test to terminals A1-A2 (phase A).
3. Simultaneously energize the digital input 3POLE BF INITIATE and the starting input of the precision timer.
4. After 1 PHASE TIMER T1 (0.050s) the relay will trip.
5. Verify that the actual operating time is equal to 1 PHASE TIMER T1 (accuracy ± 5% or 30 ms, whichever is
greater).
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7. INSTALLATION AND MAINTENANCE
7.
INSTALLATION AND MAINTENANCE
7.1. INSTALLATION
The relay should be installed in a clean, dry and dust-free place, with no vibrations.
The DBF system is supplied in a 19’’ rack case 2 units high. Figure 5 shows the dimension diagram.
The relay should be mounted on a vertical surface. Figure 6 shows a diagram for panel drilling.
Given that the design of the DBF unit is based on high performance digital technology it is not necessary to
calibrate the relay. However if the tests show that it is necessary to readjust the relay, it is recommended to return
the unit to the factory to check it.
7.2. CONNECTION-TO-GROUND AND DISTURBANCES SUPPRESSION
The terminal (see Figure 2) should be connected to ground so that the disturbance suppression circuits in the
system works correctly. This connection should be as short as possible (preferably 25 cm or less) to guarantee
maximum protection. In this way the capacitors that are internally connected between the inputs and ground divert
high frequency disturbances directly to ground without passing through the electronic circuits. Then the internal
circuitry is perfectly protected.
In addition this connection also guarantees the physical safety of the personnel when handling the relay, since the
whole casing is connected to ground.
7.3. MAINTENANCE
Given the important role that the protection relays play in the operation of any installation, a periodic program of
tests is highly recommended. The unit incorporates built-in diagnostic functions that permit the fast identification of
some of the most likely circuit failures. Testing the unit is recommended at intervals of 2 years or more. Although
the built-in diagnosis does not reduce the average time between failures, it does increase the availability of the
protection because it allows a drastic reduction in the average interruption time involved in detecting and repairing
the fault.
The set of tests which can be performed to test that all aspects of the DBF unit function properly is described in
detail in the chapter entitled ACCEPTANCE TESTS.
Since most of the protection and communications functions are integrated in two separate programs, it is unlikely
that faults will occur due to problems of wear and tear, short-circuits or aging which are typical in other
electromechanical protection systems, whether analogue or hybrid. Moreover, a failure in the communications
processor does not affect the protection functions, which are implemented by a dedicated processor.
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8. KEYBOARD AND DISPLAY
8.
KEYBOARD AND DISPLAY
The DBF has a 20 key keyboard and a liquid crystal DISPLAY with 32 characters, divided into two rows of 16
each. The following diagram shows the appearance of the DBF Keyboard:
SET
INF
1/Y
4
2
5
8
0
3/N
CLR
6
9
.
ACT
END
7
+
ENT
The keyboard program uses menus to access the different relay functions. These functions are divided into five
large groups, each of which is accessed using a different key. These groups are the following:
Information: Provides data about the state of the relay, alarms, breaker status, record of currents, events record,
etc. This menu is accessed using the INF key.
Control: Permits reset of latching relays, oscillography triggering and synchronizing. This menu is accessed by
pressing the ACT key.
Settings: Permits viewing and changing all the relay settings. This menu is accessed by pressing the SET key.
Configuration menu: Permits access to the system configuration and the modification of the passwords, access,
communication speeds, etc. This menu is accessed by keying in the code "7169" In order to access this mode the
relay should be on the main screen.
Single key menu: By pressing the ENT key the DBF can be operated in a simplified mode. It is not necessary to
remove the plastic cover on the front of the relay to access this mode. In steady state the DBF shows the following
message on the DISPLAY :
DBF
GENERAL ELECTRIC
At this point the five groups mentioned above can be selected. In order to select a different group the user must
return to this screen and press the key that corresponds to that group.
Once inside a group it is not possible to select a different one. Movement to any other group is carried out using
the following keys : ENT, CLR, and the up, down, left, right arrows. Their function is as follows:
ENT: Accepts the option that is shown on the screen. It is equivalent to go down one level in the menu tree.
CLR: Quits the option that is shown on the screen. It is equivalent to go up one level in the menu tree.
UP/DOWN ARROWS: Change options. The equivalent of a horizontal movement within a menu. When the
required option appears on the screen it can be selected with the ENT key.
LEFT/RIGHT ARROWS: Show the different possibilities of a given setting. It is not used for all settings. When the
required option appears on the screen it can be selected with the ENT key.
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8. KEYBOARD AND DISPLAY
8.1. MENU TREE.
The DBF has different menus divided into levels. The Level 0 is the steady state screen. The Level 1 of the
different menus is accessed by pressing the corresponding group key (SET, INF, etc.). The scrolling within a
given level is done by using the UP and DOWN arrows. It is possible to go down to levels 2 and 3 by pressing the
ENT key. Press CLR to go up a level within the menu tree. The Level 1 for each of the five groups is shown in the
following table :
Group
Level 1
VIEW SETTINGS
Description
View settings
CHANGE SETTINGS
CHANGE COUNTER
Change settings
Change counters
STATUS
Shows the status of the relay
Change date and time
SET DATE/TIME
TRIGGERING
Triggers the oscillography
Ia
In
Ia current in primary Amps
In current in primary Amps
Accumulated kA2 sec. for phase A
Accumulated number opens
Shows logic for 50BF High Set.
Shows status of 50BF
I2t A COUNTER
Nº OPENINGS
3/2-Phase Logic
50BF Pickup
Relay ON/OFF
52A Status
52B Status
Relay ON/OF condition
Breaker Pole A (open/closed)
Breaker Pole B (open/closed)
Breaker Pole C (open/closed)
Latching Relay 1 (open/closed)
Latching Relay 2 (open/closed)
Shows date and time
52C Status
LATCHING RELAY 1 Status
LATCHING RELAY 2 Status
DATE & TIME
NETWORK SPEED
NETWORK STOP BITS
LOCAL SPEED
LOCAL STOP BITS
LOCAL SETTINGS
REMOTE SETTINGS
LOCAL OPERATION A
REMOTE OPERATIONS
UNIT NUMBER
PASSWORD
PORT3 (remote) comm. Speed
PORT3 (remote) Stop bits
PORT1&2 (local) comm. Speed
PORT1&2 (local) Stop bits
Local settings change allowed
Remote settings change allowed
Local operations allowed
Remote operations allowed
Number of the unit
View/Change comm. Password
Max. t between 2 synch signals (only for
relays in DDS integrated systems)
t TIME-OUT
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8. KEYBOARD AND DISPLAY
8.2. SETTINGS GROUP (SET KEY)
This group allows to see and modify the DBF settings. It is accessed by pressing the SET key when the DBF is in
steady state. When the SET key is pressed the following message appears on the screen:
VIEW SETTINGS
PROTECTION
When the UP/DOWN arrows are pressed the message changes to:
MODIFY SETTINGS
PROTECTION
And the last UP/DOWN action gives:
MODIFY COUNTERS
PROTECTION
For the above windows, the menu tree is shown in the following tables. Note that to go down a level in the tree the
ENT key must be pressed, and the CLR key to go up
Level 1
Level 2
Level 3
RELAY STATUS
IDENTIFICAT
Level 4
In/Out of service
20 characters
50 – 60 Hz
GENERAL SETTINGS FREQUENCY
PHASE CT RATIO
1-4000
GROUND CT RATIO
1-4000
BREAKER NUMBER
4 digits
KI2t OP. MODE
KI2t INT TIME
KI2t LIMIT
Fixed / Measuring
0.03 - 0.25 s
1 – 999999 kA2s
BREAKER SETTINGS
ACTIVE
ACTIVE TABLE
TABLE SET
1 –3
PREFAULT CYCLES
PICKUP
0-4
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
ENABLE/DISABLE
1st STAGE TRIP
2nd STAGE TRIP
INTERNAL ARC
50BF A TRIP
50BF B TRIP
50BF C TRIP
50BF 3P TRIP
EXTERNAL TRIGGER
COMM. TRIGGER
HI-SET A PICKUP
HI-SET B PICKUP
HI-SET C PICKUP
50BF A INIT
50BF B INIT
50BF C INIT
LO-SET A PICKUP
LO-SET B PICKUP
LO-SET C PICKUP
3 POLE 50BF INIT
NEUTRAL PICKUP
ARC A PICKUP
ARC B PICKUP
ARC C PICKUP
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8. KEYBOARD AND DISPLAY
Level 1
Level 2
Level 3
50BF 1P FUNCTION
Level 4
PERM/NON-PERM.
PERM/NON-PERM.
PERM/NON-PERM.
1.0-12A *
1.0-12A *
0.5-6.0A *
0.05-2s
0.05-2s
FUNCTION
PERMIT
50BF 3P FUNCTION
3P NO INT FUNCT.
PH HISET PICKUP
PH LOSET PICKUP
NEUTRAL PICKUP
1 PHASE TIMER T1
3 PHASE TIMER T2
3P NO I TIMER T3
BF LOGIC (3P/2P)
SEVERE FAULT 3P
LOW LOAD 2P
50BF SETTINGS T1
0.05-2s
3 PHASE/2 PHASE
PERM./NON-PERM.
PERM/NON-PERM
1 / 2
Nº OUTPUT STAGES
2
nd STAGE TIMER
0.05-2s
50 BF SETTINGS T2
50 BF SETTINGS T3
Same than for TABLE 1
Same than for TABLE 1
INT ARC PICKUP
INT ARC TIMER
0.05-1A
0.1-2.0 s
INTERNAL ARC SET T1
INTERNAL ARC SET T2
INTERNAL ARC SET T 3
Same than for TABLE 1
Same than for TABLE 2
To change any setting the procedure is as follows:
•
•
•
•
•
•
•
Press the SET key.
Select the option MODIFY SETTINGS (using ↑↓ arrow keys).
Press ENT key.
Select the required setting group in the menu tree (with ↑↓ arrow keys).
Press ENT key.
Select the required specific setting (with ↑↓ arrow keys).
ENTER the value to be modified ( or select the required value from the list of available settings using
right/left arrow keys).
•
•
•
Press the ENT key.
Press the END key.
The relay will request confirmation of the change by means of the following message:
CONFIRM
Y/N
•
•
To confirm the change, press the 1/Y key. (If not, press 3/N).
The relay will then show the following message on the screen (LCD):
SETTINGS CHANGE
EXECUTED
•
Press the CLR key four times to return to the main first screen (rest).
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8. KEYBOARD AND DISPLAY
If the setting entered is outside the limits of the valid range, the relay will not accept the change and will show the
following message:
SETTING OUT
OF RANGE
Some settings do not accepts numeric values; instead of that, different possibilities will be shown by pressing
left/right arrow keys.
To perform MODIFY OF PROTECTION COUNTERS, the available menus are:
Level 1
Level 2
Level 3
I2t A COUNTER
I2t B COUNTER
I2t C COUNTER
Nº A OPENINGS
Nº B OPENINGS
Nº C OPENINGS
Valid Range
0-999999
0-999999
0-999999
0-9999999
0-9999999
0-9999999
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8. KEYBOARD AND DISPLAY
8.3. INFORMATION GROUP (INF KEY)
On the steady-state(no communications request), the LCD display at the front of the relay shows the following:
DBF
GENERAL ELECTRIC
By pressing the INF key, the next screen will show:
STATUS
This group provides information about the DBF. Press the ENT key to access this group. The information
displayed is:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Model of DBF relay
Data Base Number
Protection Software Version
Comm. Software Version
Phase A Current
Phase B Current
Phase C Current
Neutral Current
I2t phase A Counter
I2t phase B Counter
I2t phase C Counter
Number of phase A Openings
Number of phase B Openings
Number of phase C Openings
Type of Logic (2P/3P)
High-set Pickup Status - ∅A
High-set Pickup Status - ∅B
High-set Pickup Status - ∅C
Low-set Pickup Status - ∅A
Low-set Pickup Status - ∅B
Low-set Pickup Status - ∅C
Neutral Pickup Status
50BF Initiation Status - ∅A
50BF Initiation Status - ∅B
50BF Initiation Status - ∅C
50BF 3Pole Initiation Status
Arc Pickup - ∅A
Arc Pickup - ∅B
Arc Pickup - ∅C
General 50BF Pickup Status
Relay Ready
Active Table Number
Status of Circuit Breaker - ∅A
Status of Circuit Breaker - ∅B
Status of Circuit Breaker - ∅C
Latching Relay 1 Status
Latching Relay 2 Status
Local Connection Status
Date and Time Status
Communications EEPROM Status
Communication Settings (User or Default)
Protection Link Status
IRIG-B Link
Actual Date and Time
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8. KEYBOARD AND DISPLAY
8.4. CONTROL GROUP (ACT KEY)
Being on the steady-state screen of LCD at the front of the relay, by Pressing ACT key, the following will prompt:
SET
DATE/TIME
Pressing ENT key the system allows to set the date and time by entering the year, month, day hour, minutes and
seconds in this sequence. After each setting the ENT key must be pressed.
If instead of pressing the ENT key when the SET DATE/TIME screen appears, the arrow key (up or down) is
pressed, the next screen will be shown:
COMMUNICATION
TRIGGER
By pressing ENT key, the following sequence will be displayed:
•
•
CONFIRM: Yes/No ?
OPERATION EXECUTED/OPERATION CANCELED
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8. KEYBOARD AND DISPLAY
8.5. SINGLE KEY MENU
Being on the steady-state screen of LCD at the front of the relay, by Pressing ENT key, the “single key menu” will
be accessed. Then, the information displayed while step by step pressing ENT key is:
•
•
•
•
•
•
•
•
•
•
•
•
•
Phase A Current
Neutral Current
I2t Phase A Counter
Number of phase A Openings
Type of BF Logic
50BF Pickup Status
Protection Status
Circuit Breaker ∅A Pole Status
Circuit Breaker ∅B Pole Status
Circuit Breaker ∅C Pole Status
Latching Relay 1 Status
Latching Relay 2 Status
Date and Time
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8. KEYBOARD AND DISPLAY
8.6. CONFIGURATION MENU.
The DBF has a configuration unit which can only be accessed by means of the keyboard.
To enter the configuration, start from the main screen ‘DBF – GENERAL ELECTRIC’ and use the keyboard to
enter a four-digit code. If the code is correct the access to the configuration unit is permitted. If not it returns to the
main screen.
The code is unique for all the DBF relays and is not intended to be a password, but rather a simple safety
measure to avoid accidental changes to the configuration. This code is 7169, chosen to coincide with the ASCII
code for the initials GE.
After pressing 7169 at the front keyboard, and scrolling with the arrow keys, the following information will appear:
•
•
NET. BAUDRATE : The speed in bauds which the DBF will use for serial communications through the remote
port. The possible speeds are between 1200 and 19200 bauds.
NET.STOP BITS : The number of stop bits which are added to each byte which is transmitted on the serial
line. It is treated as a binary logic setting selected by means of the logic key 1/Y for 1 and 3/N for 2.
•
•
•
•
•
LOC. BAUDRATE : as above but for local communications.
LOC. STOP BITS : As above but for local communications.
LOCAL SETTINGS : Settings changes by local communications (allowed/not allowed).
REM SETTINGS : Settings changes by remote communications (allowed/not allowed).
LOC OPERATIONS : Operations being performed by local communications (computer directly connected)
(allowed/not allowed).
•
•
•
REM OPERATIONS : Operations being performed by remote communications (e.g. modem) (allowed/not
allowed).
UNIT NUMBER : Each DBF is identified by a unit number which it uses to identify the messages which are
sent to it on the remote communications line. This number can be between 1 and 255.
PASSWORD : To prevent unauthorized persons from communicating with the relay via a communications
program and changing the settings or performing operations, the relay has a password. This password can
only be seen on the relay display and takes the form of a number between 0 and 99999.
•
t TIME-OUT : Set to 0 if the relay is not working in a DDS integrated system. Set to the maximum time
between two synch signals coming from the PC host, when the relay is working in a DDS integrated system. If
a new synch signal is not received in this time the relay will report an error.
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8. KEYBOARD AND DISPLAY
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FIGURES
FIGURES
.
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DBF Breaker Failure Protection
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FIGURES
FIGURE 1 BREAKER FAILURE LOGIC (189C4114 SHEET 2)
DBF Breaker Failure Protection
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FIGURES
FIGURE 2. EXTERNAL CONNECTIONS (189C4114 SHEET 1)
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FIGURES
FIGURE 3. FRONT VIEW (226B7412 H9)
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FIGURES
FIGURE 4 REAR VIEW (226B7412H10)
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FIGURES
FIGURE 5 DIMENSIONS DIAGRAM (226B6086H10)
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FIGURES
FIGURE 6 PANEL DRILLING (226B6086H10)
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FIGURES
DBF
Label
DB-9 Male
DB-9 Female
Connector
Connector
NOTE
Leave shield unconnected at
both ends
1
1
FIGURE 7 RS232 CONNECTION (DBF RELAY TO PC)
DBF
Label
DB-9 Male
Connector
DB-9 Male
Connector
NOTE:
1
Leave shield unconnected
at both ends
1
FIGURE 8 RS232 CONNECTION (DBF RELAY TO MODEM)
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