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Analysis of PD Signal for Condition Monitoring of MV Switchboards by the Measurement of Transient Earth Voltage

  • Guoming Wang
  • Woo-Hyun Kim
  • Jeong-Bae Kong
  • Gyung-Suk Kil
  • Hong-Keun Ji
Regular Paper
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Abstract

This paper dealt with the application of transient earth voltage (TEV) sensors for the online measurement and analysis of partial discharge (PD) in medium-voltage switchboards. To simulate the typical insulation defects in the switchboards, four types of artificial electrode systems, including high-voltage protrusion, low-voltage protrusion, particle-on-conductor, and void inside cast-resin potential transformer were fabricated. A TEV sensor with a frequency range of 1–150 MHz and a non-inductive resistor were used to detect the PD-induced TEV signal and the PD voltage pulse, respectively. The frequency spectrums of TEV signals were analyzed, and it was found that they had a mutual frequency range of 5–50 MHz. However, the amplitude of TEV signal was not proportional to the apparent charge specified in IEC 60270, resulting the difficulty of quantification of PD. The phase-resolved partial discharge patterns were acquired using the TEV sensor and the developed measuring algorithm, by which distinguishable patterns were obtained from different defects.

Keywords

Partial discharge Transient earth voltage Insulation defect Phase-resolved partial discharge pattern 

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Copyright information

© The Korean Institute of Electrical and Electronic Material Engineers 2018

Authors and Affiliations

  • Guoming Wang
    • 1
  • Woo-Hyun Kim
    • 1
  • Jeong-Bae Kong
    • 1
  • Gyung-Suk Kil
    • 1
  • Hong-Keun Ji
    • 2
  1. 1.Department of Electrical and Electronics EngineeringKorea Maritime and Ocean UniversityBusanKorea
  2. 2.Physical Engineering DivisionNational Forensic Service Daegu InstituteDaeguKorea

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