正极性操作冲击下棒–棒间隙先导发展试验与仿真研究  

Experimental and Simulation Study on the Leader Development in Rod-rod Air Gaps Under Positive Switching Impulse Voltage

作　　者：谢耀恒[1] 刘赟[1] 叶会生[1] 贺恒鑫[2] 何俊佳[2] 

机构地区：[1]国网湖南省电力公司电力科学研究院,湖南省长沙市410007 [2]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《中国电机工程学报》2016年第21期5983-5989,6043,共7页Proceedings of the CSEE

摘　　要：先导发展是正极性棒–棒长间隙放电中影响其击穿特性的最主要过程,为了更加准确的研究并获得先导发展特性,基于两台CMOS高速摄相机,通过搭建棒–棒长间隙放电综合观测平台,开展了不同尺度下放电试验,获得了比传统方法更加清晰的先导发展过程图谱。然后作为进一步的对比研究,建立了考虑上、下棒电极电场畸变作用对先导发展影响的仿真模型,利用试验结果验证了该模型的准确性,并运用所提出的仿真模型对先导发展过程进行了仿真。试验和仿真结果表明,负极性上行先导在先导跃变阶段才会起始并朝正极性下行先导方向发展,两者的发展速度几乎相等并随着距离接近发展越快,负极性上行先导发展长度几乎等于跃变距离的一半。The main form of electrical discharge in long air rod-rod gaps is broken down by leader mechanism. The leader development in rod-rod gaps under positive switching impulse was investigated by using two high-speed CMOS cameras. The clearer and more particular colorized physical morphology of the leader propagation process than the traditional image converter cameras was recorded and the leader development parameters were also obtained. As a comparative study, an improved simplified model for the rod-rod configuration was performed to simulate the leader development. The numerical simulations of leader development characteristics were in a close agreement with that of experimental measurements. From the experimental measurements and simulated results, it is obtained that the negative upward leader is incepted at the beginning of the final jump stage and develops to the positive downward leader. Moreover, the propagation velocities of both leaders are almost equal and keep gradually increase with the decrease of the distance of the rest gap. The length of the negative upward leader is almost half of the final jump distance.

关 键 词：正极性放电 操作冲击 先导发展 棒–棒间隙 仿真 

分 类 号：TM85[电气工程—高电压与绝缘技术]