GE G60 Instruction Manual page 506

CONTROL ELEMENTS
5.8.12.4 Breaker restrike
SETTINGS  CONTROL ELEMENTS  MONITORING ELEMENTS  BREAKER RESTRIKE 1(2)
 BREAKER RESTRIKE 1

5
According to IEEE standard C37.100 entitled 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."
The breaker restrike algorithm responds to a successful interruption of the phase current following a declaration of
capacitor bank offline as per the breaker pole indication. If a high-frequency or system 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
period of time. The user can add counters 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.
5-330
BREAKER RESTRIKE 1

FUNCTION: Disabled
BKR RESTRIKE 1

BLOCK: Off
BREAKER RESTRIKE 1

SOURCE: SRC 1
BREAKER RESTRIKE 1

PICKUP: 0.50 pu
BREAKER RESTRIKE 1

RST DELAY: 0.100 s
BREAKER RESTRIKE 1

HF DETECT: Enabled
BKR RSTR 1 BKR OPEN:

Off
BKR RSTR 1 OPEN CMD:

Off
BKR RSTR 1 CLS CMD:

Off
BREAKER RESTRIKE 1

TARGET: Self-reset
BREAKER RESTRIKE 1

EVENTS: Disabled
Figure 5-192: Typical restrike waveform and detection flag
Range: Disabled, Enabled
Range: FlexLogic operand
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.10 to 2.00 pu in steps of 0.01
Range: 0.000 to 65.535 s in steps of 0.001
Range: Disabled, Enabled
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
operand asserts for a short
BRK RESTRIKE 1 OP
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS