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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

Example text

27A/mi. 27)(150) = 340 A If a more accurate calculation is required, Eq 1 can be evaluated as follows. /mi) fs where rl = radius of one conductor in bundle, in feet dlZ,d13,... ,dln = distance between conductors in the bundle, in feet For a single conductor, Xa(eq) = Xa! 0536 ft. 1492 MSl/mi which corresponds to a current of 319 A. The estimated current of 340 A from the curve is slightly on the conservative side. If the Ferranti effect is considered, the value of the inductive reactance per mile is required.

3 Switching Capacitor Banks Under Faulted Conditions. The voltages and currents which can occur when switching a faulted capacitor bank depend upon the grounding conditions, whether the fault is to the bank neutral or to ground, and on the sequence in which the three phases interrupt. 0 Em, (phase-to-ground). When switching a faulted bank, this value may be exceeded, as may the rated capacitance switching current value. Typical recovery voltages and currents for a three-phase capacitor bank are shown in Tables 8, 9 and 10.

4) The source must have a coefficient of grounding of 80 percent as defined in ANSI/ IEEE Std 100-1977, IEEE Standard Dictionary of Electrical and Electronics Terms. (5) With ungrounded capacitor banks, the condition with one phase of the capacitor bank shorted is not covered in this application guide. Applications outside the above limits should be referred to the manufacturer for consideration. While the values of recovery voltage and current shown in Tables 4, 5 , 6 and 7 are related to specific system voltages with specific system parameters as noted, the results are generally applicable to any rated voltage.

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