Ferroresonance in a 13.8 kV Distribution Line

Overvoltages, for which ferroresonance was the suspected cause, were observed in the meter shop of an electric utility company, which was correlated with a broken conductor in a 13.8 kV overhead line. The shape of the distorted waveforms and the presence of many power-factor correction capacitors on the lightly loaded line led to the suspicion that this was the cause. A time-domain electromagnetic transient simulation was used to reproduce the waveforms, verifying that ferroresonance was indeed the cause of the overvoltages