GE B30 Instruction Manual page 254

5.6 GROUPED ELEMENTS
5
In general, 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. Tripping from the breaker failure scheme should trip all breakers, both local
and remote, that can supply current to the faulted zone. Usually operation of a breaker failure element will cause clearing of
a larger section of the power system than the initial trip. Because breaker failure can result in tripping a large number of
breakers and this affects system safety and stability, a very high level of security is required.
Two schemes are provided: one for three-pole tripping only (identified by the name "3BF") and one for three pole plus sin-
gle-pole operation (identified by the name "1BF"). The philosophy used in these schemes is identical. The operation of a
breaker failure element includes three stages: initiation, determination of a breaker failure condition, and output.
5-124
BF1 BKR POS2 φA/3P:
MESSAGE
Off
BF1 BREAKER TEST ON:
MESSAGE
Off
BF1 PH AMP HISET
MESSAGE
PICKUP: 1.050 pu
BF1 N AMP HISET
MESSAGE
PICKUP: 1.050 pu
BF1 PH AMP LOSET
MESSAGE
PICKUP: 1.050 pu
BF1 N AMP LOSET
MESSAGE
PICKUP: 1.050 pu
BF1 LOSET TIME
MESSAGE
DELAY: 0.000 s
BF1 TRIP DROPOUT
MESSAGE
DELAY: 0.000 s
BF1 TARGET
MESSAGE
Self-reset
BF1 EVENTS
MESSAGE
Disabled
BF1 PH A INITIATE:
MESSAGE
Off
BF1 PH B INITIATE:
MESSAGE
Off
BF1 PH C INITIATE:
MESSAGE
Off
BF1 BKR POS1 φB
MESSAGE
Off
BF1 BKR POS1 φC
MESSAGE
Off
BF1 BKR POS2 φB
MESSAGE
Off
BF1 BKR POS2 φC
MESSAGE
Off
B30 Bus Differential System
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: 0.001 to 30.000 pu in steps of 0.001
Range: 0.001 to 30.000 pu in steps of 0.001
Range: 0.001 to 30.000 pu in steps of 0.001
Range: 0.001 to 30.000 pu in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
Range: FlexLogic™ operand
Valid only for 1-Pole breaker failure schemes.
5 SETTINGS
GE Multilin