东北电力技术2025，Vol.46Issue(5)：28-31,4.
一起主变低压侧隔离开关异常烧蚀故障分析
Analysis of Isolating Switch Abnormal Ablation on Low Voltage Side of Main Transformer
朱思丞 1汤明 1吴靖1
作者信息
- 1. 国网杭州供电公司,浙江 杭州 310007
- 折叠
摘要
Abstract
An abnormal ablation of 10 kV isolating switch on the low voltage side of the main transformer in a 220 kV substation causes three-side breaker tripping failure.The on-site disassembling inspection of the fault isolating switch is carried out.The inspection results show that the locking mechanism of the isolating switch is not clamped,the contact area and contact pressure between the mov-ing contact arm and the static contact decrease,the contact resistance increases and causes heating,and part of the current flows through the stop bar.The cause of the fault is concluded that the C-phase stop bar of the isolating switch seriously heated under the ac-tion of the load current,causing the distortion of the surrounding electric field,which further develops into the three-phase short-cir-cuit fault under the joint action of arc movement,gas expansion and metal melt.Combined with the causes of the isolation switch fai-lure,the preventive measures are proposed to improve safe and reliable equipment operating level.关键词
主变压器/隔离开关/异常烧蚀Key words
main transformer/isolating switch/abnormal ablation分类
信息技术与安全科学引用本文复制引用
朱思丞,汤明,吴靖..一起主变低压侧隔离开关异常烧蚀故障分析[J].东北电力技术,2025,46(5):28-31,4.
