摘要
研究目的:接触网绝缘子自然污秽中CaSO4等微溶盐的存在,导致相同测量盐密下人工污秽与自然污秽绝缘子污闪电压存在差异,使得运维部门不能准确地把握绝缘子的实际污秽度,给污闪的防治工作带来困难.本文以盐碱地区接触网绝缘子为研究对象,通过热力学和Pitzer电解质溶液理论充分考虑盐碱地区主要污秽成分,建立CaSO4在混合盐溶液中的溶解度模型,对绝缘子等值盐密(ESDD)、灰密(NSDD)和闪络电压计算公式进行修正,并与单片XP-160绝缘子污闪试验数据进行对比.研究结论:(1)盐碱地区比其他地区更易发生污闪事故;(2)污秽成分以CaSO4和NaCl为主,其余污秽成分可通过抑制或促进CaSO4的溶解改变污液电导率,其对闪络电压的影响不应被忽略;(3)污闪电压修正公式的修正数据与试验数据的误差在6%以内;(4)本研究结果可为绝缘子在混合污秽成分下的闪络电压修正以及盐碱地区的运行维护提供参考.
Research purposes:Calcium sulfate and other slightly soluble salts in the natural pollution of catenary insulators could result in differences in flashover voltages between artificially and naturally polluted insulators at the same salt deposition density,which will make the operation and maintenance department unable to accurately obtain the actual pollution degree of the insulator.In this paper,the catenary insulator in the saline-alkali area is taken as the research object.The solubility model of CaSO4 in the mixed salt solution is established through thermodynamics and Pitzer electrolyte solution theory.The calculated formulas of equivalent salt deposition density,non-soluble deposit density deposition density and flashover voltage of the insulator were modified by using the obtained CaSO4 solubility model,and the results from the correction formula are compared with the experimental data from the artificial pollution test of the XP-160 insulator.Research conclusions:(1)Salt-alkali areas are more prone to flashover than other areas;(2)The remaining polluted components can change the conductivity of the polluted solution by inhibiting or promoting the dissolution of CaSO4,and its influence on the flashover voltage should not be ignored;(3)The error between the corrected data of the formula and the test data is within 6%;(4)The research results can provide a reference for the flashover voltage correction of insulators under mixed pollution components and the operation and maintenance of insulators in saline-alkali areas.
作者
王思华
刘阳
WANG Sihua;LIU Yang(Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;New-type Rail Transit Design and Research Institute of China Railway Siyuan Survey and Design Group Co.Ltd,Suzhou,Jiangsu 215000,China)
出处
《铁道工程学报》
EI
北大核心
2020年第7期89-94,共6页
Journal of Railway Engineering Society
基金
国家自然科学基金项目(51767014)
中国铁路总公司科技研究开发计划项目(2017J010-C).
关键词
接触网绝缘子
污秽成分
污闪电压
CASO4
修正公式
catenary insulator
the composition of pollutants
flashover voltage
CaSO4
corrected formula
