access icon free Transient overvoltage response performance of transformer windings with short-circuit fault

© The Institution of Engineering and Technology
Received 08/05/2017, Accepted 13/02/2018, Revised 08/01/2018, Published 15/02/2018

The fault diagnosis of transformer windings is a basis for condition maintenance. Conventional online or offline diagnosis methods require additional pulse or impulse signal. If the overvoltage signal can be regarded as the broadband excitation source for the fault diagnosis of transformer windings, the interference caused by signal injection is likely eliminated without additional pulse or impulse signals. In this study, the transient overvoltage response performance of transformer windings with short-circuit fault is presented, which could provide a new method for the diagnosis on transformer fault diagnosis. A 10 kVA, 2400 V/220 V, 50 Hz, 1-phase tapped transformer was designed, and a test platform for the fault diagnosis of transformer windings is established. The excitation signals for the fault diagnosis of the transformer windings included different lightning waves and damped oscillation waves, as indicated by the differences among actual overvoltage waveforms. The voltage and current of windings under normal and fault conditions are determined, and the frequency responses of admittance and voltage transfer function are calculated. The criterion for the fault diagnosis of transformer windings is obtained by comparing and analysing statistical indicators that reflected the differences in the frequency response of transfer function under normal and fault.

Inspec keywords: transformer windings; statistical analysis; overvoltage; fault diagnosis; power transformer testing

Other keywords: statistical analysis; frequency response; transformer winding; short-circuit fault diagnosis; transient overvoltage response performance; voltage 2400 V; apparent power 10 kVA; broadband excitation source; condition maintenance; interference elimination; admittance transfer function; 1-phase tapped transformer; voltage 220 V; lightning wave; voltage transfer function; frequency 50 Hz; signal injection; damped oscillation wave

Subjects: Transformers and reactors; Other topics in statistics

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