5-318 F60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUALMONITORING ELEMENTS CHAPTER 5: SETTINGS55.9.0.5 Breaker restrikeSETTINGS CONTROL ELEMENTS MONITORING ELEMENTS BREAKER RESTRIKE 1(3)One breaker restrike element is provided for each DSP in the F60.According to IEEE standard C37.100 entitled IEEE Standard Definitions for Power Switchgear, restrike is defined as “aresumption of current between the contacts of a switching device during an opening operation after an interval of zerocurrent of ¼ cycle at normal frequency or longer.”Figure 5-173: Typical restrike waveform and detection flagThe breaker restrike algorithm responds to a successful interruption of the phase current following a declaration ofcapacitor bank offline as per the breaker pole indication. If a high-frequency or system frequency current with amagnitude greater than the threshold is resumed at least ¼ of a cycle later than the phase current interruption, then a BREAKER RESTRIKE 1 BREAKER RESTRIKE 1FUNCTION: DisabledRange: Disabled, Enabled BKR RESTRIKE 1BLOCK: OffRange: FlexLogic operand BREAKER RESTRIKE 1SOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4 BREAKER RESTRIKE 1PICKUP: 0.50 puRange: 0.10 to 2.00 pu in steps of 0.01 BREAKER RESTRIKE 1RST DELAY: 0.100 sRange: 0.000 to 65.535 s in steps of 0.001 BREAKER RESTRIKE 1HF DETECT: EnabledRange: Disabled, Enabled BKR RSTR 1 BKR OPEN:OffRange: FlexLogic operand BKR RSTR 1 OPEN CMD:OffRange: FlexLogic operand BKR RSTR 1 CLS CMD:OffRange: FlexLogic operand BREAKER RESTRIKE 1TARGET: Self-resetRange: Self-reset, Latched, Disabled BREAKER RESTRIKE 1EVENTS: DisabledRange: Disabled, Enabled
