Power Engineer Journal
Year : 2008, Volume : 10, Issue : 20
First page : ( 24) Last page : ( 34)
Print ISSN : 0000-0000.

Swept Frequency Response Analysis (SFRA) – An efficient tool for transformer winding distortion – A case study on power grid transformers at Delhi

Yadav Ashok Kumar, Taneja Subhash C.

Power Grid Corporation of India Ltd.

Abstract

High short circuit currents can lead to deformations and displacements of the transformer windings due to mechanical forces. The paper discusses Swept Frequency Response Analysis (SFRA) - a modem diagnostic method which identifies such pre-damaged power transformers which has better sensitivity towards changes in the winding geometry. Changes in the geometric configuration alter the impedance network, and in tum alter the transfer function. This enables a wide range of failure modes to be identified.

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Keywords

Transformer, Core and Winding Distortion, Swept Frequency Response Analysis (SFRA), Low Voltage Impulse (LVI).

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