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Additional resources for ANSI-IEEE C37.012-1979 - IEEE Application Guide For Capacitance Current Switching For AC High-Voltage Circuit Breakers Rated On A Symmetrical Current Basis

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7)These values were obtained by digital computer and transient network analyzer studies. (8) The numerical values listed for E and I are ratios of the peak value of transient recovery voltage to Em, (phase-to-ground), and the ratio of the peak value of switched capacitance current to the peak value of rated capacitance switching current. 86 Two Interrupters in Series (2) no Yes Yes Yes NOTE: The values were obtained by analysis and from studies on a miniature system. (1) Ratio peak recovery voltage to E, (phaseto-ground).

Up to twice normal inrush currents are possible when reclosing is applied to a circuit breaker switching capacitance loads. When capacitor bank current is interrupted at or near a normal current zero, the voltage remaining on the bank may be near peak value. Reclosing a circuit breaker against such a charged capacitor bank may produce high inrush current. When a capacitor bank is connected to the load side of a feeder breaker equipped with automatic reclosing, high inrush currents can be avoided by isolating the capacitor bank from other loads after the circuit breaker is tripped and before reclosing.

A phase-to-ground fault produces the most severe conditions when the source is ungrounded and the bank neutral is grounded. Relative values are listed in Table 10. 46 Em, (phase-toground). 46 E, (phase-to-ground) recovery voltage. 0 Em, (phase-to-ground). 46 Em, (phase-toground) which will be shared with the third phase. If the faulted phase reignites, one of the unfaulted phases will then interrupt and the conditions will be as previously described when an unfaulted phase was the first to interrupt.

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ANSI-IEEE C37.012-1979 - IEEE Application Guide For Capacitance Current Switching For AC High-Voltage Circuit Breakers Rated On A Symmetrical Current Basis


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