GE Multilin C60, Instruction Manual

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5-182 C60 Breaker Protection System GE Multilin
5.7 CONTROL ELEMENTS 5 SETTINGS
5
d) BREAKER RESTRIKE
PATH: SETTINGS
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CONTROL ELEMENTS
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MONITORING ELEMENTS
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BREAKER RESTRIKE 1(2)
One breaker restrike element is provided for each CT/VT module in the C60.
According to IEEE standard C37.100: IEEE Standard Definitions for Power Switchgear , restrike is defined as “a resumption
of current between the contacts of a switching device during an opening operation after an interval of zero current of
¼ cycle at normal frequency or longer”.
Figure 5–88: TYPICAL RESTRIKE WAVEFORM AND DETECTION FLAG
The breakrer restrike algorithm responds to a successful interruption of the phase current following a declaration of capaci-
tor bank offline as per the breaker pole indication. If a high-frequency current with a magnitude greater than the threshold is
resumed at least ¼ of a cycle later than the phase current interruption, then a breaker restrike condition is declared in the
corresponding phase and the
BRK RESTRIKE 1 OP
operand is asserted for a short period of time. The user can add coun-
ters and other logic to facilitate the decision making process as to the appropriate actions upon detecting a single restrike or
a series of consecutive restrikes.
A restrike event (FlexLogic™ operand) is declared if all of the following hold:
„
BREAKER RESTRIKE 1
„
BREAKER RESTRIKE 1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
BKR RSTR 1 BLOCK:
Off
Range: FlexLogic™ operand
MESSAGE
BREAKER RESTRIKE 1
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
BREAKER RESTRIKE 1
PICKUP: 0.500 pu
Range: 0.10 to 2.00 pu in steps of 0.01
MESSAGE
BREAKER RESTRIKE 1
RESET DELAY: 0.100 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
BKR RSTR 1 BKR OPEN:
Off
Range: FlexLogic™ operand
MESSAGE
BKR RSTR 1 OPEN CMD:
Off
Range: FlexLogic™ operand
MESSAGE
BKR RSTR 1 CLS CMD:
Off
Range: FlexLogic™ operand
MESSAGE
BREAKER RESTRIKE 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
BREAKER RESTRIKE 1
EVENTS: Disabled
Range: Disabled, Enabled
0
2
4
6
8
10
–2
–4
–6
–8
–10
0.01
0.02
0.03
0.05
time (ms)
curr
ent
(amps)
OPERATE
834764A1.CDR