Neutral Displacement of Ungrounded Capacitor Banks During Switching

Attention is focused on the character of neutral-displacement voltages produced at ungrounded, shunt capacitor banks during normal switching of the bank. Closing operations, opening operations, the effects of reignitions or restrikes, the effects of insertion resistors, and the presence of parallel-connected banks are considered in the analysis. The proper application of neutral-displacement voltage detection devices is discussed, particularly the difficulties in using transformers to sense neutral voltage. Finally, several test oscillograms are included to confirm major points of the analytical investigation.