操作冲击电压下GIS绝缘子表面电荷的积聚特性

发布时间：2018-01-11 11:33

本文关键词：操作冲击电压下GIS绝缘子表面电荷的积聚特性　出处：《中国电机工程学报》2017年15期 　论文类型：期刊论文

【摘要】：在气体绝缘变电站(gas insulated substation,GIS)的实际运行工况中,开关操作会使GIS设备承受操作冲击过电压,导致盆式绝缘子表面积聚表面电荷,表面电荷的存在不仅会使得局部电场发生畸变,更为沿面放电的发展提供了电荷,是造成绝缘子沿面闪络的重要因素。该文以实际的252k V GIS盆式绝缘子为试验模型,建立了表面电荷测量试验平台,采用静电探头法测量了SF6气体密闭环境下盆式绝缘子的表面电荷,获得了操作冲击电压作用下盆式绝缘子表面电荷积聚特性及其外施电压作用次数和电压幅值对其的影响。研究结果表明:无论在正极性或负极性操作冲击电压下,绝缘子表面均同时积聚正负极性电荷,但是负极性电荷相比于正电荷积聚量更大,且正极性电压下此现象更为明显;正极性操作冲击电压下,随着电压幅值的增加,绝缘子表面电荷平均积聚量明显增加,最高电荷幅值为-0.52μC/m~2,而负极性电压下,电荷平均积聚量表现出先增大后减小的趋势,其电荷平均密度最大为-0.16μC/m~2;表面电荷积聚量随着外施电压次数的增加逐渐增大,正极电压下表面电荷积聚量的增幅明显,而负极性电压下表面电荷增幅较小,但分布较均匀。该文研究所得到的操作冲击电压下GIS表明电荷积聚特性,进一步强调了由表面电荷引起的实际工况下设备绝缘问题的重要性,可为GIS设备绝缘子的优化设计提供参考。
[Abstract]:In the actual operation condition of gas insulated substation in gas insulated substation, switching operation will make GIS equipment withstand operation impulse overvoltage. The surface charge is accumulated on the surface of the basin insulator. The existence of the surface charge not only distorts the local electric field, but also provides the charge with the development of the discharge along the surface. This paper takes the actual 252kV GIS basin insulator as the test model and establishes the surface charge measurement test platform. The surface charge of the basin insulator in the closed environment of SF6 gas was measured by electrostatic probe method. The characteristics of charge accumulation on the surface of the basin insulator and the effects of applied voltage times and voltage amplitudes on it are obtained under the action of operating impulse voltage. The results show that:. Whether in positive polarity or negative polarity operating impulse voltage. The positive and negative charge is accumulated on the surface of insulator, but the negative charge is larger than the positive charge, and this phenomenon is more obvious under the positive polarity voltage. Under the positive operating impulse voltage, the average charge accumulation on the surface of the insulator increases obviously with the increase of the voltage amplitude, and the maximum charge amplitude is -0.52 渭 C / mm2, while at the negative polarity voltage. The average charge accumulation showed a tendency of first increasing and then decreasing, and the maximum charge average density was -0.16 渭 C / m ~ (2). The surface charge accumulation increases gradually with the increase of applied voltage times, the increase of surface charge accumulation under positive voltage is obvious, but the increase of surface charge under negative polarity voltage is smaller. But the distribution is more uniform. The GIS under the operating impulse voltage obtained in this paper shows the characteristics of charge accumulation, and further emphasizes the importance of the insulation problem of the equipment under the actual working condition caused by the surface charge. It can provide reference for the optimization design of insulator of GIS equipment.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);全球能源互联网研究院;
【基金】：国家重点基础研究发展计划项目(973项目)(2014CB239502)~~
【分类号】：TM216
【正文快照】： negative voltage.The conclusion reached in this paper couldprovide a further emphasis on importance of the insulatingissues caused by the surface charge accumulation and areference for the optimal design of GIS insulators.荷;操作冲击电压;积聚特性0引言气

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