GE L90 Instruction Manual page 459

CHAPTER 5: SETTINGS
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 causes
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.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
BF1 USE TIMER 2:

Yes
BF1 TIMER 2 PICKUP

DELAY: 0.000 s
BF1 USE TIMER 3:

Yes
BF1 TIMER 3 PICKUP

DELAY: 0.000 s
φ
BF1 BKR POS1 A/3P:

Off
φ
BF1 BKR POS2 A/3P:

Off
BF1 BREAKER TEST ON:

Off
BF1 PH AMP HISET

PICKUP: 1.050 pu
BF1 N AMP HISET

PICKUP: 1.050 pu
BF1 PH AMP LOSET

PICKUP: 1.050 pu
BF1 N AMP LOSET

PICKUP: 1.050 pu
BF1 LOSET TIME

DELAY: 0.000 s
BF1 TRIP DROPOUT

DELAY: 0.000 s
BF1 TARGET:

Self-Reset
BF1 EVENTS:

Disabled
BF1 PH A INITIATE:

Off
BF1 PH B INITIATE:

Off
BF1 PH C INITIATE:

Off
φ
BF1 BKR POS1 B:

Off
φ
BF1 BKR POS1 C:

Off
φ
BF1 BKR POS2 B:

Off
φ
BF1 BKR POS2 C:

Off
GROUPED ELEMENTS
Range: Yes, No
Range: 0.000 to 65.535 s in steps of 0.001
Range: Yes, No
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: 0.020 to 30.000 pu in steps of 0.001
Range: 0.020 to 30.000 pu in steps of 0.001
Range: 0.020 to 30.000 pu in steps of 0.001
Range: 0.020 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
5-273