GE B90 Instruction Manual page 300
Low impedance bus differential
system
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- Instruction manual (510 pages) ,
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- Instruction manual (440 pages)
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GROUPED ELEMENTS
5
The breaker failure feature has two parts: breaker failure current supervision and breaker failure logic. Breaker failure
current supervision acts upon current levels and is available if the
is "Protection." Breaker failure logic is based on status information and is available if the
setting is "Logic." The Breaker failure element requires B90 fiber optic interconnection and proper
B90 FUNCTION
configuration of the breaker failure and direct input/output settings. See the Application of Settings chapter for details.
5.6.4.1 Breaker failure protection
In general, breaker failure schemes expect that the breaker receiving the trip command opens within a set time. If it does
not, upstream or adjacent breakers are tripped to effectively clear the fault. This widespread tripping usually interrupts
power to a larger section of the power system than the initial trip. A higher level of security is required due to the effect on
system safety and stability.
The breaker failure scheme is intended for three-pole operation but can be used with single-pole tripping if certain
conditions are satisfied (see the note below). The operation of the breaker failure element includes three stages: initiation,
identification of a breaker failure condition, and output (or response).
5-144
BREAKER FAILURE
CURRENT SUPV 2
BREAKER FAILURE 2
BREAKER FAILURE
CURRENT SUPV 24
BREAKER FAILURE 24
BF1 BKR TEST ON:
Off
BF1 AMP HISET OP A:
Off
BF1 AMP HISET OP B:
Off
BF1 AMP HISET OP C:
Off
BF1 AMP LOSET OP A:
Off
BF1 AMP LOSET OP B:
Off
BF1 AMP LOSET OP C:
Off
BF1 LOSET TIME
DELAY: 0.000 s
BF1 TRIP DROPOUT
TIME DELAY: 0.000 s
BF1 RETRIP TIME
DELAY: 0.000 s
BF1 BLOCK:
Off
BF1 TARGET:
Self-Reset
BF1 EVENTS:
Disabled
PRODUCT SETUP B90 FUNCTION B90 FUNCTION
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: 0.000 to 65.535 s in steps of 1
Range: 0.000 to 65.535 s in steps of 1
Range: 0.000 to 65.535 s in steps of 1
Range: FlexLogic operand
Range: Self-Reset, Latched, Disabled
Range: Enabled, Disabled
setting
PRODUCT SETUP B90 FUNCTION
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