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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

Sample Calculation. Determine the line charging current that a circuit breaker must interrupt for application on a 550 kV system. The line parameters are Voltage Length Phase spacing Subconductor fs Subconductor spacing with f, = system frequency, in hertz D = equivalent phase spacing, in feet or for a single-circuit line, (Eq A2) = v d a b dbc dca where dab,dbc,and d,, are the distances in feet 'between conductors. Also. for n conductors in a bundle configuration. 27A/mi. 27)(150) = 340 A If a more accurate calculation is required, Eq 1 can be evaluated as follows.

If there are n capacitor banks of approximately equal capacitance and separated by an approximately equal inductance to the fault, then the total discharge current is approximately equal to the sum of the crest current of each bank or n times that of one bank. This is demonstrated as follows: maining on the bus section to be deenergized. In the example of Fig 11, this means that the tie circuit breaker must be capable of switching two banks of capacitors in parallel with two banks of capacitors on the source side.

The equivalent circuit for energizing capacitor banks, assuming that the time of closing the switch occurs when the power frequency voltage is a maximum and that the time duration of the transient is small when compared with the power frequency, is shown in Fig B1. 012-1979 APPLICATION GUIDE FOR CAPACITANCE CURRENT SWITCHING FOR Fig B1 frequency currents must be added together to arrive at the actual current. In the Laplace domain the general equation for the current is The energization current of a single deenergized capacitor bank is represented mathematically by letting C1 = L1 = E2 = 0 and El = E,.

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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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