Key Technology Research and Experimental Analysis of Transformer Online Frequency Response
The frequency response analysis (FRA) is one of the most effective offline methods to detect the winding deformation of transformers.This paper studies the online application of FRA,as well as the method of injection of swept frequency signal and the extraction of response signal.The related protective circuit were also designed.The online tests on one 380 V/35000 V transformer were performed based on the designed hardware circuit.To simulate the winding deformation,the different shunt capacitors were connected with the primary side of the transformer.With the change of the capacitor value,the sensitivity of online FRA method was reflected.
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维普
