Study Characteristics for Simultaneous Faults in Electrical Power Systems based on Wavelet Transform

A. Ngaopitakkul and C. Apisit (Thailand)


PSCAD/EMTDC, Simultaneous Fault, Discrete Wavelet Transforms, Transmission System


In the literature for fault detection, most of research works have never been mentioned about effects of simultaneous faults. This paper presents behaviour of characteristics for simultaneous fault signals in a 500-kV electrical power transmission system using wavelet transform. The fault signal is simulated using PSCAD/EMTDC and the behavior analysis of signals is performed using discrete wavelet transform (DWT). The DWT is used in order to detect the high frequency components. The results obtained from the analysis will be useful in the development of a detect fault scheme for electrical transmission line in the future due to an effect of the other fault that occurs at the other side of the system (bus NCO) leading to the malfunction of the protective relays.

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