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35kV主变差动保护动作跳闸分析

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本文介绍了一起35 kV主变差动保护动作跳闸事故,通过对故障间隔设备进行逐一排查分析和对关键元器件的材质分析、安装工艺进行分析,结合排除法、现场相关数据及软件模拟分析,导致301断路器跳闸的主要原因为隔离开关动触头螺杆端部存在尖端毛刺,运行过程中产生悬浮电位,系统电压波动、湿度增加时尖端毛刺放电造成B、C相瞬间短路,最终导致主变差动速断及比率差动保护动作.对整个放电故障过程进行了分析,并提出了相对应的防范措施.该次35 kV主变差动保护动作跳闸案例为今后类似事故的防范和处理提供了经验与参考.
Analysis of 35 kV Main Transformer Differential Protection Trip
This paper introduces an incident of a 35 kV main transformer differential protection action trip,and through the method of systematically examining and analyzing each device in the fault bay,as well as analyzing the material quality and installation techniques of key components,combined with the elimination method,on-site relevant data,and software simulation analysis,it is determined that the primary cause for the trip of circuit breaker 301 was the presence of sharp burrs at the end of the moving contact screw of the disconnector.During operation,these sharp burrs generated a floating potential,and when there were fluctuations in system voltage or increased humidity,discharge occurred due to the sharp burrs causing an instantaneous short circuit between phases B and C,ultimately triggering the main transformer differential instantaneous and ratio differential protections.The entire process of the discharge fault has been analyzed,and corresponding preventive measures have been proposed.This case study of a 35 kV main transformer differential protection action trip provides experience and reference for the prevention and handling of similar incidents in the future.

Circuit breakerTransformerDisconnectorSharp burr dischargeSimulation

张乔石、张雄、王文兵、周仿荣、徐腾波、苏应敢、付文诚

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云南电网有限责任公司怒江供电局,云南 怒江 673100

云南电网有限责任公司电力科学研究院,云南 昆明 650127

云南电网有限责任公司德宏供电局,云南 德宏,678400

云南电网有限责任公司玉溪供电局,云南 玉溪,653100

云南电网有限责任公司大理供电局,云南 大理,671000

云南电网有限责任公司西双版纳供电局,云南 西双版纳,666100

云南电网有限责任公司曲靖供电局,云南 曲靖,655000

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断路器 变压器 隔离开关 尖端毛刺放电 仿真

2024

云南电力技术
云南省电机工程学会 云南电力试验研究院(集团)有限公司电力研究院

云南电力技术

影响因子:0.244
ISSN:1006-7345
年,卷(期):2024.52(4)
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