Interpretation of Sweep Frequency Response Analysis (SFRA) Traces for the Multiple Winding Faults which are Practically Simulated on the 10 KVA Power Transformer

Abstract

This paper presents how multiple winding faults can be detected by Sweep Frequency Response Analysis (SFRA). The test methods used by the authors for presenting the results are described. The Short Circuited Turns Fault on HV phase winding and Earth Fault on LV phase winding have been practically simulated simultaneously on the 10 KVA, 11000 V / 440 V, 3-phase, 50 Hz, Dyn11 Power Transformer which is specially designed and developed in-house. The result of these simulated faults are presented and discussed. The SFRA data analysis is performed on three phase comparison basis and a conclusion has been drawn from it.