GE C70 Instruction Manual page 350

5.7 CONTROL ELEMENTS
c) BREAKER RESTRIKE

PATH: SETTINGS CONTROL ELEMENTS
 BREAKER RESTRIKE 1

5
One breaker restrike element is provided for each CT/VT module in the C70.
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".
10
8
6
4
2
0
–2
–4
–6
–8
–10
The breaker 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
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:
5-226

MONITORING ELEMENTS
BREAKER RESTRIKE 1
FUNCTION: Disabled
BKR RSTR 1 BLOCK:
MESSAGE
Off
BREAKER RESTRIKE 1
MESSAGE
SOURCE: SRC 1
BREAKER RESTRIKE 1
MESSAGE
PICKUP: 0.500 pu
BREAKER RESTRIKE 1
MESSAGE
RESET DELAY:
BKR RSTR 1 BKR OPEN:
MESSAGE
Off
BKR RSTR 1 OPEN CMD:
MESSAGE
Off
BKR RSTR 1 CLS CMD:
MESSAGE
Off
BREAKER RESTRIKE 1
MESSAGE
TARGET: Self-reset
BREAKER RESTRIKE 1
MESSAGE
EVENTS: Disabled
0.01
0.02
OPERATE
Figure 5–106: TYPICAL RESTRIKE WAVEFORM AND DETECTION FLAG
operand is asserted for a short period of time. The user can add coun-
BRK RESTRIKE 1 OP
C70 Capacitor Bank Protection and Control System

BREAKER RESTRIKE 1(3)
Range: Disabled, Enabled
Range: FlexLogic operand
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.10 to 2.00 pu in steps of 0.01
Range: 0.000 to 65.535 s in steps of 0.001
0.100 s
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
0.03
5 SETTINGS
time (ms)
0.05
834764A1.CDR
GE Multilin