Phase determination of partial discharge source in a three-phase transmission line based on high-frequency equivalent circuit model and signal detection using HFCT

Abstract

SUMMARY This paper proposes a method for determining the phase where partial discharges (PD) occur based on a high‐frequency equivalent circuit model of the cable. The high‐frequency current transformer (HFCT) is employed for signal measurement. Since the PD singles are propagated as a travelling wave along the power cable, the HFCT can be used to detect electricity signal and determine where PD sources are taken place from the transmission lines. The conventional observations of PD signals via oscilloscopes are affected by capacitive effect (i.e., cross‐talk). Measuring the polarity of the waveform can improve the accuracy of PD source determination which can be identified by an equivalent circuit model. From simulation and measurement results, the polarity of the waveform in the phase where PD occurs is just the inverse of the signal waveforms in other two phases. Furthermore, the crest value of the waveform, estimation of the power spectral density and average power are used to verify this new approach. Finally, the proposed approach can accurately determine the phase location of PD sources in the field under high noise environment. Copyright © 2011 John Wiley & Sons, Ltd.

Convolutional Neural Network-Based Pattern Recognition of Partial Discharge in High-Speed Electric-Multiple-Unit Cable Termination

“…The PD test platform used in this study comprises the voltage regulator, the test transformer, the protection resistance, the discharge sample, the high-frequency current transformer (HFCT), and the high-frequency oscilloscope, among other components, as depicted in Figure 1 . The HFCT, known for its exceptional sensitivity, straightforward setup, and strong anti-interference capabilities [ 43 ], is a widely used instrument for the online detection of PD signals, particularly when the ground conductor of the device under test is accessible. The circuit of the PD test platform is illustrated in Figure 2 .…”

Prediction of salt contamination in the rotating blade of wind turbine under lightning strike occurrence using fuzzy c‐means and k‐means clustering approaches

“…The high-frequency current transformer (HFCT) was widely employed to detect partial discharge (PD) signals for assessing insulation conditions on a power cable; transformer and a threephase transmission line [10][11][12][13][14][15]. The lightning strike current is measured by clamping HFCT around the grounding line when the lightning strike surge experiment of each salt contaminated blade was conducted by turns.…”