Overview
A “Breaker failure” scheme determines that a breaker signaled to trip has not cleared a fault within a definite time, so further tripping action must be performed.
For more detailed information on “Breaker failure” element, refer to GE, Universal Relay (UR) family of products, Version 8.0x manuals.
To view other supported elements, click here.
Setting Parameters
Modbus memory map for Setting parameters
| Products | Hex address | Register name | Range | Units | Step | Format | Default |
| B30, C60, C70, C95, D60, F60, G60, L30, L60, L90, M60, T60 | 5435 | Breaker Failure 1 Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 5436 | Breaker Failure 1 Mode | 0 to 1 | — | 1 | F157 | 0 (3-Pole) |
| " | 5437 | Breaker Failure 1 Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 5438 | Breaker Failure 1 Amp Supervision | 0 to 1 | — | 1 | F126 | 1 (Yes) |
| " | 5439 | Breaker Failure 1 Use Seal-In | 0 to 1 | — | 1 | F126 | 1 (Yes) |
| " | 543A | Breaker Failure 1 Three Pole Initiate | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 543C | Breaker Failure 1 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 543E | Breaker Failure 1 Phase Amp Supv Pickup | 0.02 to 30 | pu | 0.001 | F001 | 1050 |
| " | 543F | Breaker Failure 1 Neutral Amp Supv Pickup | 0.02 to 30 | pu | 0.001 | F001 | 1050 |
| " | 5440 | Breaker Failure 1 Use Timer 1 | 0 to 1 | — | 1 | F126 | 1 (Yes) |
| " | 5441 | Breaker Failure 1 Timer 1 Pickup | 0 to 65.535 | s | 0.001 | F001 | 0 |
| " | 5442 | Breaker Failure 1 Use Timer 2 | 0 to 1 | — | 1 | F126 | 1 (Yes) |
| " | 5443 | Breaker Failure 1 Timer 2 Pickup | 0 to 65.535 | s | 0.001 | F001 | 0 |
| " | 5444 | Breaker Failure 1 Use Timer 3 | 0 to 1 | — | 1 | F126 | 1 (Yes) |
| " | 5445 | Breaker Failure 1 Timer 3 Pickup | 0 to 65.535 | s | 0.001 | F001 | 0 |
| " | 5446 | Breaker Failure 1 Breaker Status 1 Phase A/ 3P | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 5448 | Breaker Failure 1 Breaker Status 2 Phase A/ 3P | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 544A | Breaker Failure 1 Breaker Test On | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 544C | Breaker Failure 1 Phase Amp Hiset Pickup | 0.02 to 30 | pu | 0.001 | F001 | 1050 |
| " | 544D | Breaker Failure 1 Neutral Amp Hiset Pickup | 0.02 to 30 | pu | 0.001 | F001 | 1050 |
| " | 544E | Breaker Failure 1 Phase Amp Loset Pickup | 0.02 to 30 | pu | 0.001 | F001 | 1050 |
| " | 544F | Breaker Failure 1 Neutral Amp Loset Pickup | 0.02 to 30 | pu | 0.001 | F001 | 1050 |
| " | 5450 | Breaker Failure 1 Loset Time | 0 to 65.535 | s | 0.001 | F001 | 0 |
| " | 5451 | Breaker Failure 1 Trip Dropout Delay | 0 to 65.535 | s | 0.001 | F001 | 0 |
| " | 5452 | Breaker Failure 1 Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 5453 | Breaker Failure 1 Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 5454 | Breaker Failure 1 Phase A Initiate | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 5456 | Breaker Failure 1 Phase B Initiate | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 5458 | Breaker Failure 1 Phase C Initiate | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 545A | Breaker Failure 1 Breaker Status 1 Phase B | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 545C | Breaker Failure 1 Breaker Status 1 Phase C | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 545E | Breaker Failure 1 Breaker Status 2 Phase B | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 5460 | Breaker Failure 1 Breaker Status 2 Phase C | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 5462 | Breaker Failure 1 Retrip Pickup Delay | 0 to 65.535 | seconds | 0.001 | F001 | 33 |
| " | 5463 | …Repeated for Breaker Failure 2 | |||||
| B30, C60, C70, C95, D60, F60, L90, T60 | 5491 | …Repeated for Breaker Failure 3 | |||||
| B30, C60, C95, D60, F60, L90, T60 | 54BF | …Repeated for Breaker Failure 4 | |||||
| B30, T60 | 54ED | …Repeated for Breaker Failure 5 | |||||
| " | 551B | …Repeated for Breaker Failure 6 | |||||
| B30 | 5549 | …Repeated for Breaker Failure 7 | |||||
| " | 5577 | …Repeated for Breaker Failure 8 | |||||
| " | 55A5 | …Repeated for Breaker Failure 9 | |||||
| " | 55D3 | …Repeated for Breaker Failure 10 | |||||
| " | 5601 | …Repeated for Breaker Failure 11 | |||||
| " | 562F | …Repeated for Breaker Failure 12 | |||||
| " | 565D | …Repeated for Breaker Failure 13 | |||||
| " | 568B | …Repeated for Breaker Failure 14 | |||||
| " | 56B9 | …Repeated for Breaker Failure 15 | |||||
| " | 56E7 | …Repeated for Breaker Failure 16 | |||||
| " | 5717 | …Repeated for Breaker Failure 17 | |||||
| " | 5743 | …Repeated for Breaker Failure 18 | |||||
| " | 5771 | …Repeated for Breaker Failure 19 | |||||
| " | 579F | …Repeated for Breaker Failure 20 |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
| F126 | 0 = No, 1 = Yes | ||||||
| F157 | 0 = 3-Pole, 1 = 1-Pole | ||||||
| F167 | 0 = SRC 1, 1 = SRC 2, 2 = SRC 3, 3 = SRC 4, 4 = SRC 5, 5 = SRC 6 | ||||||
| F300 | 0 : Off (This is boolean FALSE value), 1 : On (This is boolean TRUE value) | ||||||
Logics & highlights
FlexLogic operands
Breaker failure main path sequence
Breaker failure overcurrent supervision reset time
Single-pole breaker failure, initiate logic
Single-pole breaker failure, timers logic
Three-pole breaker failure, initiate logic
Three-pole breaker failure, timers logic
Definition of Setting Parameters
BF 1 MODE — This setting is used to select the breaker failure operating mode: single or three pole.
BF 1 USE AMP SUPV — If set to “Yes,” the element is initiated if current flowing through the breaker is above the supervision pickup level.
BF 1 USE SEAL-IN — If set to “Yes,” the element is sealed-in if current flowing through the breaker is above the supervision pickup level.
BF 1 3-POLE INITIATE — This setting selects the FlexLogic operand that initiates three-pole tripping of the breaker.
BF 1 RETRIP PICKUP DELAY — This setting specifies a pickup delay for the re-trip command. Set this delay longer than the possible spurious contact input activation duration due to transients or temporary DC grounds, taking into account the contact input de-bounce time to avoid re-trip operation for such transients.
BF 1 PH AMP SUPV PICKUP — This setting is used to set the phase current initiation and seal-in supervision level. Generally this setting detects the lowest expected fault current on the protected breaker. It can be set as low as necessary (lower than breaker resistor current or lower than load current)—high-set and low-set current supervision guarantee correct operation.
BF 1 N AMP SUPV PICKUP — This setting is used to set the neutral current initiate and seal-in supervision level. Generally this setting detects the lowest expected fault current on the protected breaker. Neutral current supervision is used only in the three phase scheme to provide increased sensitivity. This setting is valid only for three-pole tripping schemes.
BF 1 USE TIMER 1 — If set to “Yes,” the early path is operational.
BF 1 TIMER 1 PICKUP DELAY — Timer 1 is set to the shortest time required for breaker auxiliary contact Status-1 to open, from the time the initial trip signal is applied to the breaker trip circuit, plus a safety margin.
BF 1 USE TIMER 2 — If set to “Yes,” the main path is operational.
BF 1 TIMER 2 PICKUP DELAY — Timer 2 is set to the expected opening time of the breaker, plus a safety margin. This safety margin was historically intended to allow for measuring and timing errors in the breaker failure scheme equipment. In microprocessor relays this time is not significant. In G60 relays, which use a Fourier transform, the calculated current magnitude ramps-down to zero one power frequency cycle after the current is interrupted, however this lag does not need to be included in the overall margin duration due to a novel current supervision reset element, as it occurs after current interruption. As shown in the previous figure, this current supervision reset element guarantees breaker failure reset in less than 0.7 power cycles for any subsidence current and irrespective of the magnitude of the fault current.
Note that in bulk oil circuit breakers, the interrupting time for currents less than 25% of the interrupting rating can be significantly longer than the normal interrupting time.
BF 1 USE TIMER 3 — If set to “Yes,” the Slow Path is operational.
BF 1 TIMER 3 PICKUP DELAY — Timer 3 is set to the same interval as timer 2, plus an increased safety margin. Because this
path is intended to operate only for low level faults, the delay can be in the order of 300 to 500 ms.
BF 1 BKR POS1 phA/3P — This setting selects the FlexLogic operand that represents the protected breaker early-type auxiliary switch contact (52/a). When using the single-pole breaker failure scheme, this operand represents the protected breaker early-type auxiliary switch contact on pole A. This is normally a non-multiplied form-A contact. The contact can even be adjusted to have the shortest possible operating time.
BF 1 BKR POS2 phA/3P — This setting selects the FlexLogic operand that represents the breaker normal-type auxiliary switch contact (52/a). When using the single-pole breaker failure scheme, this operand represents the protected breaker auxiliary switch contact on pole A. This can be a multiplied contact.
BF 1 BKR TEST ON — This setting is used to select the FlexLogic operand that represents the breaker in-service/out-ofservice switch set to the out-of-service position.
BF 1 PH AMP HISET PICKUP — This setting sets the phase current output supervision level. Generally this setting is to detect the lowest expected fault current on the protected breaker, before a breaker opening resistor is inserted.
BF 1 N AMP HISET PICKUP — This setting sets the neutral current output supervision level. Generally this setting is to detect the lowest expected fault current on the protected breaker, before a breaker opening resistor is inserted. Neutral current supervision is used only in the three pole scheme to provide increased sensitivity. This setting is valid only for three-pole
breaker failure schemes.
BF 1 PH AMP LOSET PICKUP — This setting sets the phase current output supervision level. Generally this setting is to detect the lowest expected fault current on the protected breaker, after a breaker opening resistor is inserted (approximately 90% of the resistor current).
BF 1 N AMP LOSET PICKUP — This setting sets the neutral current output supervision level. Generally this setting is to detect the lowest expected fault current on the protected breaker, after a breaker opening resistor is inserted (approximately 90% of the resistor current). This setting is valid only for three-pole breaker failure schemes.
BF 1 LOSET TIME DELAY — Sets the pickup delay for current detection after opening resistor insertion.
BF 1 TRIP DROPOUT DELAY — This setting is used to set the period of time for which the trip output is sealed-in. This timer must be coordinated with the automatic reclosing scheme of the failed breaker, to which the breaker failure element sends a cancel reclosure signal. Reclosure of a remote breaker can also be prevented by holding a transfer trip signal on longer
than the reclaim time.
BF 1 PH A INITIATE / BF1 PH B INITIATE / BF 1 PH C INITIATE — These settings select the FlexLogic operand to initiate phase A, B, or C single-pole tripping of the breaker and the phase A, B, or C portion of the scheme, accordingly. This setting is only valid for single-pole breaker failure schemes.
BF 1 BKR POS1 phB / BF1 BKR POS 1 phC — These settings select the FlexLogic operand to represents the protected breaker early-type auxiliary switch contact on poles B or C, accordingly. This contact is normally a non-multiplied Form-A contact.
The contact can even be adjusted to have the shortest possible operating time. This setting is valid only for single-pole breaker failure schemes.
BF 1 BKR POS2 phB — Selects the FlexLogic operand that represents the protected breaker normal-type auxiliary switch contact on pole B (52/a). This can be a multiplied contact. This setting is valid only for single-pole breaker failure schemes.
BF 1 BKR POS2 phC — This setting selects the FlexLogic operand that represents the protected breaker normal-type auxiliary switch contact on pole C (52/a). This can be a multiplied contact. For single-pole operation, the scheme has the same overall general concept except that it provides re-tripping of each single pole of the protected breaker. The approach shown in the following single pole tripping diagram uses the initiating information to determine which pole is supposed to trip. The logic is segregated on a per-pole basis. The overcurrent detectors have ganged settings. This setting is valid only for single-pole breaker failure schemes.
Upon operation of the breaker failure element for a single pole trip command, a three-pole trip command needs to be given via output operand BKR FAIL 1 TRIP OP.