铁道标准设计Issue(3)：129-133,134,6.DOI:10.13238/j.issn.1004-2954.2016.03.027
铁路腕臂绝缘子污秽外绝缘状态评估方法研究
External Insulation Assessment Method for Railway Cantilever Insulators
摘要
Abstract
In order to appropriately assess the external insulation of electrified railway insulator and improve the efficiency of insulator pollution flashover prevention, this paper studies pollution discharge process of electrified railway cantilever insulators under different pollution conditions by means of artificial contamination test method. By monitoring the leakage current of insulator affected with dump, this paper extracts the maximum leakage current Ih and establishes Uf relationship between Ih and flashover voltage of the tested sample on the basis of the correlation of Ih with contamination degree and dump level. On this basis, comprehensive consideration of cantilever insulator shape factor f and creepage distance L is taken, general characteristic value I*is introduced and flashing warning model in the form of Uf=aI*-b is proposed. Experimental study shows that for cantilever insulators with different structural parameters, warning model Uf = aI*-b is generally applicable due to similar discharge characteristics. The model predicted results are in good agreement with the measurements, and the coefficients of a and b can be taken as constants;but when test object is the suspension insulator XWP2-160 for transmission line, coefficients of a and b shall be treated as variables because XWP2-160 type insulator and cantilever insulator differ much in structure, which results in significant difference in pollution discharge characteristics. Study suggests that model Uf=aI*-b can effectively predict flashover voltage for insulators with similar shape and structure, and evaluate their external insulation conditions. Some findings in this paper are applicable to electrified railway cantilever insulators and may guide routine insulator maintenance.关键词
电气化铁路/接触网/腕臂绝缘子/泄漏电流/闪络电压/人工污秽试验/状态评估Key words
Electrified railway/Catenary/Cantilever insulator/Leakage current/Flashover voltage/Artificial contamination test/State assessment分类
交通工程引用本文复制引用
蒋渊博,刘长志,王黎明..铁路腕臂绝缘子污秽外绝缘状态评估方法研究[J].铁道标准设计,2016,(3):129-133,134,6.基金项目
中国铁建股份有限公司科技研究计划课题(12-C64) （12-C64）
