Effects of Faults and Shunt Reactor Parameters on Parallel Resonance

It is shown that more shunt reactor values may cause resonance on paralleled EHV lines than has been reported previously [1, 2, 3, 4] when faults on the opened circuit are analyzed. This is verified by approximate electrostatic calculations and detailed system calculations for various reactor and transformer configurations. The importance of evaluating reactor zero-sequence currents and secondary-arc currents, as well as the coupled voltages, is illustrated and aTNAsimulation ofparallel resonance is also included.