Identification of winding faults in power transformers by low voltage impulse test and neutral current method using wavelet transform approach

Author

Kumar, N. Prema ; Amarnath, J. ; Shrivastava, K.D. ; Singh, B.P.

Author_Institution

RVR & JC Coll. of Eng., Guntur, India

fYear

2005

fDate

16-19 Oct. 2005

Firstpage

140

Lastpage

143

Abstract

This paper presents the application of wavelets for the detection of minor faults in the HV winding of a power transformer by analyzing the impulse voltage and neutral current during the low voltage impulse test conducted on a HV winding of the power transformer. Effectiveness and efficiency of wavelet transforms in signal processing and differentiating incipient faults from electrical transients over other frequency response analysis (FRA) methods like transfer function (TF) method and Fourier transforms (FT) approach are discussed. The experimental results on the HV winding of a 61 MVA, 11 kV/230 kV power transformer are also presented.

Keywords

Fourier transforms; fault location; frequency response; impulse testing; power transformer testing; signal processing; transfer functions; transformer windings; wavelet transforms; 11 kV; 230 kV; 61 MVA; FRA; Fourier transforms; HV winding; electrical transient; fault detection; frequency response analysis; incipient fault differentiation; low voltage impulse test; neutral current method; power transformer; signal processing; transfer function; wavelet transform; winding fault identification; Electrical fault detection; Fault diagnosis; Fourier transforms; Impulse testing; Low voltage; Power transformers; Signal processing; Transient analysis; Wavelet analysis; Wavelet transforms;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2005. CEIDP '05. 2005 Annual Report Conference on

Print_ISBN

0-7803-9257-4

Type

conf

DOI

10.1109/CEIDP.2005.1560640

Filename

1560640