A certain 12kV line-to-line distribution feeder is served from a load-tap-changing transformer in the substation, and has two voltage regulators in series at approximately 1/3 and 2/3 of the distance between the substation and the end of the feeder. The regulators are both typical, 32-step regulators (+/-10% in 32 steps). This feeder also has one 600kvar capacitor bank installed beyond the second regulator, i.e., there are two regulators between the substation and the capacitor. System inductive reactance is 1.7 ohms upstream of the capacitor bank. Assume voltage at the substation bus remains at 231V on a 230V base regardless of feeder loading. The feeder primarily serves irrigation pumps. There is a trip-close of the feeder circuit breaker at the substation which causes most of the feeder load to trip off. The remaining feeder load is negligible. Immediately prior to the trip-close, the capacitor described above was on, one regulator was at step +12, and the other was at step +9. Calculate an estimate of the maximum RMS voltage on a 230V base at the end of the feeder, beyond both regulators and the capacitor following the trip-close of the feeder’s circuit breaker.
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