Abstract
Locating the partial discharge (PD) source is one of the most effective means to locate local defects in power cable lines. The sampling rate and the frequency-dependent characteristic of phase velocity have an obvious influence on localization accuracy based on the times of arrival (TOA) evaluation algorithm. In this paper, we present a cross-correlation algorithm based on propagation distance to locate the PD source in cable lines. First, we introduce the basic principle of the cross-correlation function of propagation distance. Then we verify the proposed method through a computer simulation model and investigate the influences of propagation distance, sampling rate, and noise on localization accuracy. Finally, we perform PD location experiments on two 250 m 10 kV XLPE power cables using the oscillation wave test system. The simulation and experiment results indicate that compared with traditional TOA evaluation methods, the proposed method has superior locating precision.
Highlights
Power cables have been extensively used in urban power grids because of their reliable electrical and mechanical properties
To solve the problem of the estimation error of the sampling rate and the frequency-dependent characteristic of phase velocity in the times of arrival (TOA) evaluation methods, in this paper, we present a new partial discharge (PD) localization method that can more accurately pinpoint the PD location in power cables lines
This method is based on the cross-correlation function of propagation distance (CFD) between the direct and reflected waves of the PD signal
Summary
Power cables have been extensively used in urban power grids because of their reliable electrical and mechanical properties. In the measured PD signals, the accuracy of all TOA evaluation methods is susceptible to the sampling rate and the frequency-dependent characteristic of phase velocity. To solve the problem of the estimation error of the sampling rate and the frequency-dependent characteristic of phase velocity in the TOA evaluation methods, in this paper, we present a new PD localization method that can more accurately pinpoint the PD location in power cables lines. This method is based on the cross-correlation function of propagation distance (CFD) between the direct and reflected waves of the PD signal. All abbreviations are listed in Appendix A for convenience
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