带并联间隙地线复合绝缘子直流覆冰闪络特性

发布时间：2018-06-10 07:57

本文选题：地线复合绝缘子 + 并联间隙　；参考：《电工技术学报》2017年14期

【摘要】：架空地线融冰已成为一个亟需解决的问题,目前通常对架空地线进行改造加装带间隙的绝缘子并采用直流融冰,其融冰电压受到地线绝缘子放电电压的制约,进而也影响了地线融冰的长度。对耐张型和悬垂型两种地线绝缘子在严重覆冰条件下并联间隙大小与地线绝缘子直流冰闪电压间的关系进行了试验研究。结果表明:两种地线绝缘子表面清洁、未覆冰情况下,其直流50%放电电压U50%与并联间距d呈幂指数关系,随着并联间距d增大,U50%增大,且增速逐渐减小;覆冰条件下,耐张型并联间隙地线复合绝缘子并联间距的选择与覆冰厚度di相关,可以选为(10+2di)mm;悬垂型地线绝缘子在严重覆冰地区建议选择80~100mm的并联间距。在保证融冰期间地线与杆塔保持良好绝缘的条件下,应选择较小间距来提高其防雷性能。
[Abstract]:Ice melting of overhead ground wire has become an urgent problem. At present, it is usually used to retrofit the overhead ground wire with a gap insulator and use DC melting ice, and its melting voltage is restricted by the discharge voltage of the ground wire insulator. It also affects the length of ground wire melting ice. The relationship between the parallel gap size of two ground wire insulators under severe icing and DC ice lightning pressure of ground wire insulators is studied experimentally. The results show that the DC 50% discharge voltage U50% has a power exponent relationship with the parallel spacing d when the surface of the two ground wire insulators is clean, and the DC 50% discharge voltage U50% increases with the increase of the parallel spacing d, and the growth rate decreases gradually. The selection of parallel distance between tension-type parallel gap composite insulators is related to the thickness of ice, which can be selected as 102dimm, and the parallel spacing of 80~100mm should be chosen for drag-type ground wire insulators in severely ice-covered areas. Under the condition that the ground wire and the tower are insulated well during the ice melting period, the lightning protection performance should be improved by choosing the smaller distance between the ground wire and the tower.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);
【基金】：国家重点基础研究发展计划(973计划)(2014CB260401) 国家创新研究群体基金(51021005)资助项目
【分类号】：TM216;TM75

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