Monitoring Elements; Breaker Arcing Current - GE UR Series Instruction Manual

5.6 CONTROL ELEMENTS
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PATH: SETTINGS CONTROL ELEMENTS
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MONITORING
„
ELEMENTS
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PATH: SETTINGS CONTROL ELEMENTS
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BREAKER 1
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ARCING CURRENT
5
There are 2 identical Breaker Arcing Current features available for Breakers 1 and 2. This element calculates an estimate
of the per-phase wear on the breaker contacts by measuring and integrating the current squared passing through the
breaker contacts as an arc. These per-phase values are added to accumulated totals for each phase and compared to a
programmed threshold value. When the threshold is exceeded in any phase, the relay can set an output operand to "1".
The accumulated value for each phase can be displayed as an actual value.
The operation of the scheme is shown in the following logic diagram. The same output operand that is selected to operate
the output relay used to trip the breaker, indicating a tripping sequence has begun, is used to initiate this feature. A time
delay is introduced between initiation and the starting of integration to prevent integration of current flow through the
breaker before the contacts have parted. This interval includes the operating time of the output relay, any other auxiliary
relays and the breaker mechanism. For maximum measurement accuracy, the interval between change-of-state of the
operand (from 0 to 1) and contact separation should be measured for the specific installation. Integration of the measured
current continues for 100 milliseconds, which is expected to include the total arcing period.
BKR 1 ARC AMP INIT:
Selects the same output operand that is selected to operate the output relay used to trip the breaker.
5-142
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MONITORING ELEMENTS

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BREAKER 1
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ARCING CURRENT
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BREAKER 2
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MESSAGE
ARCING CURRENT
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CONTINUOUS MONITOR
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MESSAGE
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CT FAILURE
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MESSAGE
DETECTOR
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VT FUSE FAILURE
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MESSAGE
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MONITORING ELEMENTS
BKR 1 ARC AMP
FUNCTION: Disabled
BKR 1 ARC AMP
MESSAGE
SOURCE: SRC 1
BKR 1 ARC AMP INIT:
MESSAGE
Off
BKR 1 ARC AMP
MESSAGE
DELAY: 0.000 s
BKR 1 ARC AMP LIMIT:
MESSAGE
1000 kA2-cyc
BKR 1 ARC AMP BLOCK:
MESSAGE
Off
BKR 1 ARC AMP
MESSAGE
TARGET: Self-reset
BKR 1 ARC AMP
MESSAGE
EVENTS: Disabled
L90 Line Differential Relay
5.6.7 MONITORING ELEMENTS

5.6.8 BREAKER ARCING CURRENT

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BREAKER 1 ARCING CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
Range: FlexLogic™ operand
Range: 0.000 to 65.535 s in steps of 0.001
2
Range: 0 to 50000 kA -cycle in steps of 1
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
GE Power Management