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MANOJMOHAN SUBRAMANIAN: DETECTION OF WINDING INTER-TURN FAULTS

BASED ON FREQUENCY RESPONSE ANALYSIS – PART III

An inter-turn fault is one of the leading causes of power transformer failures. This phenomenon could severely reduce the life span of the transformer winding. Therefore, it is necessary to diagnose the factors causing the faults and to detect the fault within the winding by using sweep frequency response analysis.

This article deals with inter-turn fault detection in the transformer winding, inter-turn fault which occurs due to insulation degradation between one or more sequential turns of the winding. If the fault is not detected at the earliest stage, it propagates to the nearby turns of the winding during a certain period of time and it causes irreversible damage to the winding. Therefore, it is necessary to detect inter-turn fault to save the transformer from catastrophic failure.

Keywords

detection, fault factor, inter-turn, SFRA, transformer

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