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The corrected current is 330 A . The final step is t o consult the table of ratings to verify the capability of the circuit breaker. 2794 %loglo D (fi/rni) and GMR is the geometrical mean radius in feet, the other symbols as before. 012-1979 Appendix B Basic Relations During Capacitance Current Switching Foreword The switching of capacitive currents can be a severe duty for the circuit breaker. Such currents, the charging current of an unloaded transmission line or cable, or the load current of a static capacitor bank are, in most cases, a maximum of a few hundred amperes.

7 5. Considerations of Capacitance Currents and Recovery Voltages Under Fault Conditions The requirements, preferred ratings and tests for capacitance switching are based on switching operations in the absence of faults. It is sometimes required, however, that a circuit breaker interrupt a capacitive circuit under faulted con7The background and mathematics involved in this method are given in Appendix B. 012-1979 phases interrupt. 06 times the rated value) is experienced in the faulted phase when it interrupts first.

The reported values are the voltages and currents imposed on the source end circuit breaker with the remote end circuit breaker already cleared. (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 Emax (phase-to-ground), and the ratio of the peak value of switched capacitance current t o the peak value of rated capacitance switching current. 5 20 3 40 1 40 3 20 3 Faulted phase third NOTES: (1) Current is interrupted in normal sequence, that is at each succeeding current zero.

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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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