Analysis and Handling of a 110 kV Transformer Differential Protection Trip Incident

LIU Jun; REN Haichuan; LI Kun; XU Shurong; HUANG Huan; DU Wei

doi:10.13296/j.1001-1609.hva.2026.01.027

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Analysis and Handling of a 110 kV Transformer Differential Protection Trip Incident

Technical Discussion | 更新时间：2026-04-13

- Analysis and Handling of a 110 kV Transformer Differential Protection Trip Incident
- High Voltage Apparatus Vol. 62, Issue 1, Pages: 216-222(2026)
- 作者机构：
  
  湖南大学电气与信息工程学院，长沙　410002
  贵州电网有限责任公司电力科学研究院，贵阳　550002
  贵州大学电气工程学院，贵阳　550025
  贵州电网有限责任公司毕节供电局，贵州毕节　551700
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.01.027
  CLC：
- Received：17 July 2025，
  
  Revised：2025-10-09，
  
  Published：16 January 2026
- 稿件说明：
移动端阅览
LIU Jun, REN Haichuan, LI Kun, et al. Analysis and Handling of a 110 kV Transformer Differential Protection Trip Incident[J]. High Voltage Apparatus, 2026, 62(1): 216-222.
DOI：

LIU Jun, REN Haichuan, LI Kun, et al. Analysis and Handling of a 110 kV Transformer Differential Protection Trip Incident[J]. High Voltage Apparatus, 2026, 62(1): 216-222. DOI： 10.13296/j.1001-1609.hva.2026.01.027.

摘要

某110 kV变压器在运期间发生差动保护跳闸，造成全站失压三级电力事件。为了查找变压器故障原因，首先分析了保护动作情况，故障后电气试验和本体油色谱数据，特别是FRA图谱中低频段电感与电容特性之间的差异，初步得到绕组故障位置和类型；其次对故障变压器进行了返厂解体分析；最后开展了以问题为导向的设计校核和电磁线机械强度测试。故障变压器绕组解体表现和分析结果基本一致，验证了分析方法的准确性，设计校核可以辨识老旧变压器抗短路能力不足风险，为防范变压器突发短路故障和内部故障诊断提供了经验指导。

Abstract

A 110 kV transformer during operation experienced a differential protection trip

resulting in a level 3 power event characterized by a complete loss of power supply at the station. For dinding out the cause of the transformer fault

the differential protection condition

electrical test and oil chromatography data of the tranformer after the fault

with the differnce between low frequency inductance and capacitance characteristics in FRA mapping in particular are analyzed firstly

and the fault location and type of the winding are initially obtained. Then

the faulty transformer is returned to the factory for disassembly analysis.Finally

the problem-oriented design checks and mechanical strength tests of electromagnetic lines are carried out. The findings from the physical dismantling inspection of the faulty transformer windings are basically consistent with the analysis results

which verifies the correctness of the analysis method. The design verification can identify the risk of insufficient short-circuit resistance of old transformers and provide empirical guidance to prevent sudden short-circuit faults and internal fault diagnosis of transformer.

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references

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