500kV复合绝缘子运行特性分析

Analysis of Operating Performance for the 500 kV Composite Insulator

为分析500kV复合绝缘子的运行特性,从而为实验室评价现场运行复合绝缘子的特性和状态提供指导,对5支500kV交流和6支500kV直流复合绝缘子进行了研究,主要包括污秽度测量,憎水性测试、解剖试验、水扩散试验和水煮及陡波试验。在此基础上,比较了交、直流复合绝缘子的积污特性,分析了复合绝缘子劣化特性和运行年限的关系,讨论了不同检测方法的应用情况。结果表明,直流绝缘子比交流绝缘子积污严重,直流绝缘子积污量随运行年限增加显著增加,交流绝缘子无明显变化;劣化特性显著的绝缘子并不是运行年限最长的绝缘子;采用的几种检测方法均能很好地反映复合绝缘子某一方面的劣化特性。

To analyze the performance characteristic of 500 kV composite insulators,which could provide reference for evaluating the performance and the status of composite insulators in service,5 pieces of 500 kV AC composite insulators and 6 pieces of 500 kV DC composite insulators were selected to be tested.The detection items included pollution measurement,hydrophobicity test,dissecting test,water diffusion test,water immersion test and steep front impulse test.Based on the tests,the contamination characteristics of the AC and DC insulators were compared and the relationship between insulators＇ operating years and its deterioration were studied.The application of different detection methods was also discussed.The results show that contamination of DC insulators is more serious than that of AC insulators.Moreover,contamination of DC insulators is significantly increased with the operation years,while that of AC insulators has no obvious change.Under the test conditions,there is no obvious relationship between the aging characteristics and the operating years of the tested insulators.Each of the evaluation methods is capable of reflecting a certain aspect of deterioration of composite insulators.