Comparison of performance of various ferroresonance suppressing methods in inductive and capacitive voltage transformers

To avoid or damp out ferroresonance in inductive and capacitive voltage transformers, a few ferroresonance damping methods have been proposed and used in these instruments. In this paper, some of the suppressing circuits are reviewed. Specifications of these circuits and the effects of various parameters on their performances are discussed. Furthermore, using frequency domain analysis, the effects of the suppression circuits on the measured voltage signal and overall characteristics of the voltage transformers in normal operating conditions are investigated. Using time domain simulations, the occurrence of ferroresonance in inductive and capacitive voltage transformers is studied and the effects of the suppressing circuits on the transient performance of these transformers and damping out ferroresonance are investigated and compared to each other