GE Multilin T60 Transformer Protection System 5-2555 SETTINGS 5.7 CONTROL ELEMENTS5d) BREAKER RESTRIKEPATH: SETTINGS CONTROL ELEMENTS MONITORING ELEMENTS BREAKER RESTRIKE 1(3)According to IEEE standard C37.100: IEEE Standard Definitions for Power Switchgear, restrike is defined as “a resumptionof current between the contacts of a switching device during an opening operation after an interval of zero current of¼ cycle at normal frequency or longer”.Figure 5–142: TYPICAL RESTRIKE WAVEFORM AND DETECTION FLAGThe 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 isresumed at least ¼ of a cycle later than the phase current interruption, then a breaker restrike condition is declared in thecorresponding 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 ora series of consecutive restrikes.A restrike event (FlexLogic™ operand) is declared if all of the following hold:• The current is initially interrupted. BREAKER RESTRIKE 1BREAKER RESTRIKE 1FUNCTION: DisabledRange: Disabled, EnabledMESSAGE BKR RSTR 1 BLOCK:OffRange: FlexLogic™ operandMESSAGE BREAKER RESTRIKE 1SOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6MESSAGE BREAKER RESTRIKE 1PICKUP: 0.500 puRange: 0.10 to 2.00 pu in steps of 0.01MESSAGE BREAKER RESTRIKE 1RESET DELAY: 0.100 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE BKR RSTR 1 BKR OPEN:OffRange: FlexLogic™ operandMESSAGE BKR RSTR 1 OPEN CMD:OffRange: FlexLogic™ operandMESSAGE BKR RSTR 1 CLS CMD:OffRange: FlexLogic™ operandMESSAGE BREAKER RESTRIKE 1TARGET: Self-resetRange: Self-reset, Latched, DisabledMESSAGE BREAKER RESTRIKE 1EVENTS: DisabledRange: Disabled, Enabled0246810–2–4–6–8–100.010.020.030.05time (ms)current (amps)OPERATE834764A1.CDR
