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Analysis of Abnormal Secondary Voltage of 500 KV HGIS Line

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  • He, Xiangwen
  • Kuang, Shaolin
  • Zhu, Bixian
  • Feng, Zhengwei
  • Wu, Zhanfeng
  • Du, An
  • Ye, Xiaojia
  • Gou, Xiaohan
  • Wang, Junkang

Abstract

A 500kV HGIS line experienced an abnormal voltage data alarm for the 3U0 voltage. Through on-site sampling verification, loop temperature measurement, and theoretical analysis, it was determined that a grounding fault existed in the secondary internal circuit of the line voltage transformer (PT), causing abnormal secondary voltage sampling outputs from two sets of line protection systems. This article provides a detailed account of the abnormal event, on-site inspection findings, fault cause analysis, and the results of the return-to-factory inspection, along with proposed corrective measures. The aim is to provide a reference for the investigation and prevention of similar issues.

Suggested Citation

  • He, Xiangwen & Kuang, Shaolin & Zhu, Bixian & Feng, Zhengwei & Wu, Zhanfeng & Du, An & Ye, Xiaojia & Gou, Xiaohan & Wang, Junkang, 2025. "Analysis of Abnormal Secondary Voltage of 500 KV HGIS Line," GBP Proceedings Series, Scientific Open Access Publishing, vol. 7, pages 24-31.
    • Handle: RePEc:axf:gbppsa:v:7:y:2025:i::p:24-31
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