Analysis and Suggestions on Continuous Overstep Tripping of Protection Caused by Secondary AC-DC Coupling

SHAO Xingzhi; LUO Jingjing; JIN Shiyan; XIE Jun

doi:10.13882/j.cnki.ncdqh.2602F021

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Analysis and Suggestions on Continuous Overstep Tripping of Protection Caused by Secondary AC-DC Coupling

更新时间：2026-06-08

- Analysis and Suggestions on Continuous Overstep Tripping of Protection Caused by Secondary AC-DC Coupling
- Rural Electrification Issue 5, Pages: 61-66(2026)
- 作者机构：
  
  国网浙江省电力有限公司杭州市临安区供电公司,浙江,杭州,311300
- 作者简介：
- 基金信息：
- DOI：10.13882/j.cnki.ncdqh.2602F021
  CLC： TM77
- Published：2026
- 稿件说明：
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邵兴志, 罗晶晶, 金诗妍, 谢俊. 二次交直流耦合引起的保护连续越级动作分析与建议[J]. 农村电气化, 2026, (5): 61-66.

SHAO Xingzhi, LUO Jingjing, JIN Shiyan, et al. Analysis and Suggestions on Continuous Overstep Tripping of Protection Caused by Secondary AC-DC Coupling[J]. Rural Electrification, 2026, (5): 61-66.
邵兴志, 罗晶晶, 金诗妍, 谢俊. 二次交直流耦合引起的保护连续越级动作分析与建议[J]. 农村电气化, 2026, (5): 61-66. DOI： 10.13882/j.cnki.ncdqh.2602F021.

SHAO Xingzhi, LUO Jingjing, JIN Shiyan, et al. Analysis and Suggestions on Continuous Overstep Tripping of Protection Caused by Secondary AC-DC Coupling[J]. Rural Electrification, 2026, (5): 61-66. DOI： 10.13882/j.cnki.ncdqh.2602F021.

摘要

文章介绍了一起因35 kV线路故障与主变二次交直流耦合，造成110 kV主变中高压后备保护连续越级动作的案例。通过调度故障处置过程、变电设备全面检查及故障原因分析，找到了本次变压器保护连续越级动作的原因，指出了案例中在变压器带电状态显示器质量、告警信息规范、二次回路设计、线路防雷方面存在的问题，并提出相应改进建议，以防范此类事件，为电网安全稳定运行积累经验。

Abstract

This paper presents a case study of continuous overstep tripping of the medium-high voltage backup protection in a 110 kV main transformer caused by a 35 kV line fault and secondary AC-DC coupling faults of the transformer. Through fault dispatching

comprehensive substation equipment inspection

and root cause analysis

this paper identifies the reasons for the continuous overstep tripping of transformer protection. The study highlights issues in this case

including substandard quality of transformer live status indicators

non-standardized alarm information

flaws in secondary circuit design

and inadequate lightning protection measures on transmission lines. Corresponding improvement suggestions are proposed to prevent similar incidents

contributing to the safe and stable operation of the power grid.

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references

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