Ferroresonance Phenomenon in Power Transformers

This paper reports on the results of recent research and
development efforts to study and assess various impacts of
ferroresonance phenomenon on operating performance of power
transformers and to investigate ways to mitigate the effects of such
phenomenon. Three-phase core-type transformers are used in the study.
The results of the technical investigation and the associated
ferroresonance experimental work performed showed that ferroresonance
can cause dangerous overvoltages and overcurrents in three-phase core-
type transformers. Sensitivity analysis results are also presented to
determine the impact of various design and operating parameters on the
resulting overvoltages and overcurrents caused by ferroresonance.

KEY WORDS: Power system transients, Ferroresonance, Transformers,
Sensitivity analysis.
Ferroresonance Phenomenon in Power Transformers