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Energies 2017, 10(11), 1762; https://doi.org/10.3390/en10111762

Disturbance Elimination for Partial Discharge Detection in the Spacer of Gas-Insulated Switchgears

1
Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University, Busan 49112, Korea
2
Forensic Safety Section, National Forensic Service Busan Institute, Yangsan 50612, Korea
3
HVDC Production Team, LSIS Co., Ltd., Busan 46739, Korea
*
Author to whom correspondence should be addressed.
Received: 26 September 2017 / Revised: 18 October 2017 / Accepted: 30 October 2017 / Published: 2 November 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

With the increasing demand for precise condition monitoring and diagnosis of gas-insulated switchgears (GISs), it has become a challenge to improve the detection sensitivity of partial discharge (PD) induced in the GIS spacer. This paper deals with the elimination of the capacitive component from the phase-resolved partial discharge (PRPD) signal generated in GIS spacers based on discrete wavelet transform (WT). Three types of typical insulation defects were simulated using PD cells. The single PD pulses were detected and were further used to determine the optimal mother wavelet. As a result, the bior6.8 was selected to decompose the PD signal into 8 levels and the signal energy at each level was calculated. The decomposed components related with capacitive disturbance were discarded, whereas those associated with PD were de-noised by a threshold and a thresholding function. Finally, the PRPD signals were reconstructed using the de-noised components. View Full-Text
Keywords: partial discharge (PD); gas-insulated switchgears (GISs); spacer; capacitive component; wavelet transform (WT); multi-resolution analysis (MRA) partial discharge (PD); gas-insulated switchgears (GISs); spacer; capacitive component; wavelet transform (WT); multi-resolution analysis (MRA)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, G.; Kil, G.-S.; Ji, H.-K.; Lee, J.-H. Disturbance Elimination for Partial Discharge Detection in the Spacer of Gas-Insulated Switchgears. Energies 2017, 10, 1762.

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