潘光辉,蒋进,郎晟,江俊贤,常俊晓,赵文东,叶远涛
PAN Guanghui,JIANG Jin,LANG Sheng,JIANG Junxian,CHANG Junxiao,ZHAO Wendong,YE Yuantao

• 1:国网浙江省电力有限公司台州供电公司
• 2:武汉工程大学

摘要(Abstract)：

GIS（气体绝缘金属封闭开关设备）内部过热故障具有强隐蔽性，易诱发绝缘劣化等严重后果。针对GIS外壳三相温差异常问题，建立精细化三维电磁-热耦合有限元模型，系统仿真分析了额定工况及接触不良工况下内部温度场分布及热量传递规律。研究表明：触头接触电阻增大会导致局部温度显著上升，且负荷电流越高，温升对电阻变化越敏感；受导体-气体-外壳多层结构的热衰减作用，内部严重过热在外壳上仅表现为微弱温升，外壳温度分布整体平缓，相间细微温差可作为内部故障的关键信号。现场工作中发现某220 kV GIS设备C相外壳存在约1.6 K的细微温升异常，经停电解体检查证实，其对应断路器主触头存在因装配工艺不良导致的接触电阻超标，与仿真结论高度吻合。本研究证实，通过监测外壳相间温差等细微热信号，可实现GIS内部早期热隐患的非侵入式诊断，为设备状态评估与预警提供理论依据和工程参考。
The internal overheating fault of Gas Insulated Metal-Enclosed Switchgear(GIS) is highly concealed and prone to cause serious consequences such as insulation deterioration. This paper addresses the issue of abnormal temperature differences among the three phases of the GIS enclosure, establishes a refined three-dimensional electromagnetic-thermal coupled finite element model, and systematically simulates and analyzes the internal temperature field distribution and heat transfer laws under rated and poor contact conditions. The research shows that an increase in contact resistance of the contacts leads to a significant rise in local temperature, and the higher the load current, the more sensitive the temperature rise to changes in resistance. Due to the thermal attenuation effect of the multi-layer structure of conductor-gas-enclosure, severe internal overheating only manifests as a slight temperature rise on the enclosure, with an overall gentle temperature distribution on the enclosure. The subtle temperature difference between phases may be a key signal of internal faults. The infrared temperature measurement results of a 220 kV GIS equipment on site show that there is an abnormal slight temperature rise of about 1.6K in the C-phase enclosure. After a maintenance and testing process, it was verified that the main contact of the corresponding circuit breaker had excessive contact resistance due to poor assembly techniques, which is highly consistent with the simulation conclusions. This study confirms that by monitoring subtle thermal signals such as temperature differences between phases of the enclosure, non-invasive diagnosis of early thermal hazards inside GIS can be achieved, providing a theoretical basis and engineering reference for equipment condition assessment and early warning.

关键词(KeyWords)： 气体绝缘金属封闭开关设备;有限元仿真;温度场分布;热屏蔽效应;三相温差异常;热隐患预警
GIS;finite element simulation;temperature field distribution;thermal shielding effect;abnormal three-phase temperature difference;thermal hazard warning

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（62573331）

作者(Author): 潘光辉,蒋进,郎晟,江俊贤,常俊晓,赵文东,叶远涛
PAN Guanghui,JIANG Jin,LANG Sheng,JIANG Junxian,CHANG Junxiao,ZHAO Wendong,YE Yuantao

DOI: 10.19585/j.zjdl.202609012

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