热场仿真和高频脉冲震荡法分析电抗器事故  

Analysis of a Dry-Type Reactor Fault Combined with COMSOL Thermal Field Simulation and High Frequency Pulse Oscillations

作　　者：罗新 黄学民 郑文坚[2] 谷裕 刘春涛 谭华安 LUO Xin;HUANG Xuemin;ZHENG Wenjian;GU Yu;LIU Chuntao;TAN Huaan(Guangzhou Bureau, CSG EHV Power Transmission Company, Guangzhou 510663, China;Faculty of Electric Power, South China University of Technology, Guangzhou 510641, China)

机构地区：[1]南方电网超高压输电公司广州局,广东广州510663 [2]华南理工大学电力学院,广东广州510641

出　　处：《中国电力》2018年第5期31-38,共8页Electric Power

摘　　要：针对一起35 k V干式电抗器单相接地故障,分别进行直流电阻预试、高频震荡脉冲匝间绝缘测试及返厂解剖,发现第5层包封区域存在严重匝间短路。电抗器匝间短路会导致导线熔断,使得常规预试项目存在局限性。对故障35 k V干式电抗器进行COMSOL有限元热场仿真,电抗器的温度分布结果表明,电抗器在运行时的最热点位于第6层包封,温升约为73.8 K,此外第5、7、14、15层包封的温升也明显高于其他包封,容易使绝缘劣化导致设备故障。通过对故障电抗器的试验进行分析及热场仿真,可以为设备的设计、制造及日常检修、维护提供参考依据。Focused on a single-phase earth fault of 35 kV dry-type reactor, comprehensive analysis is performed including impulseoscillating turn-to-turn insulation test, disassembly in manufacturer and COSMOL thermal field simulation. The cause of the accidentis turn-to-turn insulation failure in the 5th package. Due to internal conductor burning, the preventive test of DC resistancemeasurement has limitation on insulation failure detection. Thermal field simulation of reactor is also performed, and results showthat the hot spot of reactor during operation is in the 6th floor coating, which has 73.8 K temperature rise. Temperature rise on 5th,7th, 14th, 15th package is also high compared to other packages which deteriorates device insulation. The analysis and simulationresults provide valuable reference for device design, production, operation and testing.

关 键 词：干式电抗器 匝间绝缘 高频脉冲震荡法 热场仿真 

分 类 号：TM471[电气工程—电器]