Monitoring Elements - GE L30 Instruction Manual
Line current differential
system, ur series
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Also See for L30:
- Instruction manual (702 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (642 pages)
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5.7 CONTROL ELEMENTS
a) MAIN MENU
PATH: SETTINGS
CONTROL ELEMENTS
MONITORING
ELEMENTS
b) BREAKER ARCING CURRENT
PATH: SETTINGS
CONTROL ELEMENTS
BREAKER 1
ARCING CURRENT
5
There is one breaker arcing current element available per CT bank, with a minimum of two elements. This element calcu-
lates 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 com-
pared 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
5-178
MONITORING ELEMENTS
BREAKER 1
ARCING CURRENT
BREAKER 2
MESSAGE
ARCING CURRENT
CT FAILURE
MESSAGE
DETECTOR
VT FUSE FAILURE 1
MESSAGE
VT FUSE FAILURE 2
MESSAGE
MONITORING ELEMENTS
BKR 1 ARC AMP
FUNCTION: Disabled
BKR 1 ARC AMP
MESSAGE
SOURCE: SRC 1
BKR 1 ARC AMP INT-A:
MESSAGE
Off
BKR 1 ARC AMP INT-B:
MESSAGE
Off
BKR 1 ARC AMP INT-C:
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
L30 Line Current Differential System
5.7.9 MONITORING ELEMENTS
See page 5–178.
See page 5–178.
See page 5–181.
See page 5–183.
See page 5–183.
BREAKER 1(2) ARCING CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: FlexLogic™ operand
Range: FlexLogic™ operand
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 Multilin
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