光纤复合架空地线直流融冰绝缘化改造对地线绝缘子与并联放电间隙的电气要求

发布时间：2018-07-05 16:39

  本文选题：OPGW + 光纤复合架空地线　； 参考：《高电压技术》2017年08期

【摘要】：为满足光纤复合架空地线(OPGW)直流融冰的需要,同时解决环流损耗和易遭雷击断股等问题,须将OPGW接地方式由目前常用的逐塔接地改造为分段或全线绝缘、单点接地方式;OPGW经地线绝缘子及其并联放电间隙与杆塔相连。为此,提出了OPGW直流融冰绝缘化改造对并联放电间隙的电气要求,分别对正常运行时、地线直流融冰条件下和雷击情况下的并联放电间隙电气性能进行了详细的计算分析和试验研究。结果表明:并联放电间隙距离选择应满足感应电压和直流融冰电压的耐受要求,还应保证并联放电间隙在雷电过电压下可靠击穿;要满足工频感应电压的耐受要求,间隙距离可取20~100 mm;要满足直流融冰电压为-20 k V×(1±10%)的耐受要求,间隙距离应大于60 mm;考虑到间隙放电的分散性,间隙距离宜适当增大,推荐值为70~80 mm;70~80 mm间隙距离的雷电冲击放电电压一般不大于100 k V,线路遭受雷击时,地线绝缘子与并联放电间隙所承受的电压至少为885 k V,甚至高达数MV,并联放电间隙能可靠击穿,从而确保地线绝缘子的运行安全性。该研究结果可为OPGW直流融冰绝缘化改造提供理论支撑和数据支持。
[Abstract]:In order to meet the need of direct current melting ice of optical fiber composite overhead ground wire (OPGW), and to solve the problems of circulation loss and vulnerability to lightning break, it is necessary to transform OPGW grounding method from tower to tower grounding to segmental or full-line insulation. The single point grounding mode OPGW is connected to the tower through the earth wire insulator and its parallel discharge clearance. For this reason, the electrical requirements for the parallel discharge gap for the insulation transformation of direct current melting ice of OPGW are put forward, respectively, when the OPGW is in normal operation, The electrical performance of parallel discharge gap under the condition of ground DC melting ice and lightning strike is analyzed and tested in detail. The results show that the distance of the parallel discharge gap should meet the tolerance requirements of inductive voltage and DC ice-melting voltage, and it should also guarantee the reliable breakdown of the parallel discharge gap under the lightning overvoltage, and meet the tolerance requirements of the induction voltage of power frequency. The gap distance should be more than 60 mm in order to meet the tolerance requirement of -20 kV 脳 (1 卤10%) DC ice melting voltage. Considering the dispersion of gap discharge, the gap distance should be increased appropriately. The recommended lightning impulse discharge voltage is not more than 100kV when the distance between 70 mm and 7080 mm gap is recommended, and when the line is struck by lightning, The voltage between the ground wire insulator and the parallel discharge gap is at least 885 kV, even up to a few MV. The parallel discharge gap can be broken down reliably, thus ensuring the operation safety of the ground wire insulator. The results can provide theoretical support and data support for the insulation transformation of DC melting ice in OPGW.
【作者单位】： 中国电力科学研究院;国网江苏省电力公司常州供电公司;
【基金】：国家电网公司重点科技项目(TX71-13-031)~~
【分类号】：TM75
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本文编号：2100937