高海拔下交流500 kV复合横担污闪特性

发布时间：2018-08-25 08:15

【摘要】：复合横担杆塔的应用对节省输电走廊等资源具有重要意义。500 k V复合横担由2支呈"V"形布置的水平大直径绝缘子和2支斜拉绝缘子构成。为获得500 k V复合横担的污闪特性,在高海拔下,对全尺寸500 k V复合横担大直径水平部分进行了多个污秽度下的人工污秽试验,研究了污闪过程中的局部电弧电流及电弧发展过程,并校核了500 k V复合横担的污秽外绝缘配置裕度。研究结果表明:高海拔下复合横担污闪电压与污秽度呈负幂指数关系;随着污秽度的增加,最大局部电弧电流线性增加;复合横担大直径绝缘子的零星点状放电和局部电弧放电易出现在下部;复合横担双臂污闪电压低于单臂约3%,双臂下电弧发展具有交替形式。所研究500 k V复合横担具有较高的污秽外绝缘配置裕度。
[Abstract]:The application of composite pole tower is of great significance for saving transmission corridor and other resources. The 500 kV composite crossbar consists of two horizontal large-diameter insulators arranged in "V" shape and two cable-stayed insulators. In order to obtain the pollution flashover characteristics of 500 kV composite crossbar, a series of artificial contamination tests were carried out on the large diameter horizontal part of the full-size 500kV composite crossbar at high altitude. The local arc current and arc development in the process of pollution flashover are studied. The results show that there is a negative exponential relationship between the flashover voltage and the pollution degree at high altitude, and the maximum local arc current increases linearly with the increase of contamination. The spot discharge and partial arc discharge of the large diameter composite pole insulator are easy to appear in the lower part, the flashover voltage of the two arms is lower than that of the single arm, and the arc development under the two arms is alternating. The 500 kV composite cross-pole has a high pollution external insulation configuration margin.
【作者单位】：清华大学电力系统及发电设备控制和仿真国家重点实验室;中国计量科学研究院;南方电网科学研究院;
【基金】：中国南方电网科学研究院科技项目(K-KY2013-107)~~
【分类号】：TM75

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