CHAPTER 5: SETTINGS
GROUPED ELEMENTS
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
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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 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.
Two schemes are provided: one for three-pole tripping only (identified by the name “3BF”) and one for three pole plus
single-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.
BF1 BKR POS1
φ
A/3P:
Off
Range: FlexLogic operand
BF1 BKR POS2
φ
A/3P:
Off
Range: FlexLogic operand
BF1 BREAKER TEST ON:
Off
Range: FlexLogic operand
BF1 PH AMP HISET
PICKUP: 1.050 pu
Range: 0.020 to 30.000 pu in steps of 0.001
BF1 N AMP HISET
PICKUP: 1.050 pu
Range: 0.020 to 30.000 pu in steps of 0.001
BF1 PH AMP LOSET
PICKUP: 1.050 pu
Range: 0.020 to 30.000 pu in steps of 0.001
BF1 N AMP LOSET
PICKUP: 1.050 pu
Range: 0.020 to 30.000 pu in steps of 0.001
BF1 LOSET TIME
DELAY: 0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
BF1 TRIP DROPOUT
DELAY: 0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
BF1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
BF1 EVENTS:
Disabled
Range: Disabled, Enabled
BF1 PH A INITIATE:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
BF1 PH B INITIATE:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
BF1 PH C INITIATE:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
BF1 BKR POS1
φ
B:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
BF1 BKR POS1
φ
C:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
BF1 BKR POS2
φ
B:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
BF1 BKR POS2
φ
C:
Off
Range: FlexLogic operand
Valid only for 1-Pole breaker failure schemes
Summary of Contents for b30
Page 10: ...x B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Page 616: ...iv B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
Page 632: ...xvi B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL INDEX ...