COMPARISON OF FIELD AUGMENTATION FACTOR FOR DIFFERENT LIQUID INSULATIONS IN POWER TRANSFORMER

Abstract

Transformers are used to step up and step down voltage as per the requirement of power. Power transformers are High Voltage (HV) transformers which are used to step up power in power stations. These transformers suffer due to many issues of failures. One of the reasons for failure of these transformers are considered to be partial discharge (PD). Partial discharge happen due to number of reasons and discharge due to availability of tiny conductors is considered in this paper. These tiny conductors are considered to flow from bottom of the transformer to top of the transformer. When such conductor comes in contact with transformer winding, electrical stress is formed. When this stress surpasses the breakdown strength of the insulating medium partial discharge occurs. Breakdown strength of the insulating medium is a factor which changes due to practical issues at the field. The present work deals with occurrence of partial discharge in traditional mineral oil, synthetic ester and silicon oil.