一起220 kV主变压器轻瓦斯保护动作原因分析及处理  

Analysis and Treatment of the Light Gas Relay Protection Operation of a 220 kV Transformer

作　　者：郑伟钦 何胜红 徐朋江 金向朝 张勇 钟炜 ZHENG Wei-qin;HE Sheng-hong;XU Peng-jiang;JIN Xiang-chao;ZHANG Yong;ZHONG Wei(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd,Foshan 528000,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000

出　　处：《电工电气》2021年第10期35-38,43,共5页Electrotechnics Electric

摘　　要：介绍了某220kV主变压器气体继电器轻瓦斯保护动作的经过,利用变压器油色谱分析技术和电气试验对主变压器进行诊断,结合现场解体检查确认气体继电器轻瓦斯保护动作原因,是由于变压器内部磁屏蔽焊接部位过热熔化形成金属杂质,在油流的作用下附着在变压器铁芯表面和铁芯绝缘油道内部,造成铁芯多点接地形成较大环流而产生大量热量,导致变压器油色谱分析数据异常,变压器油中气体含量不断累积,使得油流达到气体继电器轻瓦斯保护动作值造成轻瓦斯动作。经过采取有效处理措施后,设备运行正常。In this paper,the operation process of a light gas relay protection of a 220 kV transformer is introduced.Chromatographic analysis and electrical tests are performed to diagnose the transformer,with the on-the-spot disassembly,the reason of the light gas protection operation is found out,that is,the weld region of the magnetic shielding inside the transformer melted down at overheating meanwhile generated some metal impurity which adhered to the core and the channel of insulating oil by the oil flow.That metal impurity caused the core multipoint earthing with big loop current,and the resulting humorous heat led to abnormal data of the chromatographic analysis.As a result,the accrued gas in the transformer oil made oil flow over the operation value of light gas relay protection and finally caused the operation.In the end,the equipment operates normally after corresponding effective treatments.

关 键 词：变压器 轻瓦斯保护 油色谱分析 

分 类 号：TM403.5[电气工程—电器] TM411