ANALYSING THE EFFECT OF CORE DEFORMATION ON PERFORMANCE OF 1kVA, 3-PHASE TRANSFORMER

Detection of minor faults in power transformer active part is essential because minor faults may develop and lead to major faults and finally irretrievable damages occur. Sweep Frequency Response Analysis (SFRA) is an effective low-voltage, off-line diagnostic tool used for finding out any possible winding displacement or mechanical deterioration inside the Transformer, due to large electromechanical forces occurring from the fault currents or due to Transformer transportation and relocation. In this method, the frequency response of a transformer is taken both at manufacturing industry and concern site. Then both the response is compared to predict the fault taken place in active part. But in old aged transformers, the primary reference response is unavailable. So Cross Correlation Co-Efficient (CCF) measurement technique can be a vital process for fault detection in these transformers. These two techniques are widely used to identify the winding displacement in the transformer.This paper explains in detail the mechanical core deformation in the 1kVA, 3-phase laboratory fabricated transformer which includes testing results of healthy transformer and core deformed transformer. The primary results obtained by measuring the various parameters of healthy transformer is later on compared with the core deformed transformer of same rating. Results obtained are then fabricated into comparative study and detailed performance of core deformed transformer of same rating is analyzed.