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Proceedings Paper

Response of chopped and modified impulse voltages to the Mexican Hat wavelet for various dilation and translation coefficients
Author(s): B. P. Singh; Murari Rajesh; V. Kamaraju; R. C. Agarwal
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Paper Abstract

High voltage power equipment have to be designed to withstand a standard lightning impulse voltage of a specified value as a type test for certification. In case of partial or complete failure of the insulation of the equipment, the shape of lightning impulse undergoes a change. In order to compute the time/frequency characteristics of such impulse voltage,the wavelet transform technique has been used. The standard, chopped and modified impulse voltages have been generated using a computer program. The various voltage/time magnitudes have been used for determination of time/frequency characteristics for a number of dilation coefficients 'a.' The values such obtained are normalized and typical values are plotted, to show the specific differences. It is inferred that there exists a threshold value of dilation constant, bellow which perturbations in the voltage waveshape/time becomes difficult to detect. The paper deals with the limitations of such method and the lowest value of dilation coefficient to be considered for the use in such analysis.

Paper Details

Date Published: 26 March 2001
PDF: 6 pages
Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); doi: 10.1117/12.421190
Show Author Affiliations
B. P. Singh, Bharat Heavy Electricals Ltd. (India)
Murari Rajesh, Jawaharlal Nehru Technological Univ. (India)
V. Kamaraju, Jawaharlal Nehru Technological Univ. (India)
R. C. Agarwal, Bharat Heavy Electricals Ltd. (India)


Published in SPIE Proceedings Vol. 4391:
Wavelet Applications VIII
Harold H. Szu; David L. Donoho; Adolf W. Lohmann; William J. Campbell; James R. Buss, Editor(s)

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