高压直流GIL中盆式绝缘子表面电荷积聚与消散的实验研究

发布时间：2018-07-04 15:22

本文选题：高压直流 + GIL　；参考：《高电压技术》2015年05期

【摘要】：研究直流电压下绝缘子表面电荷积聚及其抑制措施,是开发直流气体绝缘管道输电线路(GIL)的一项关键技术。因此建立了一套盆式绝缘子表面电荷测量系统,采用静电探头法,在空气中对施加了直流电压后的环氧树脂盆式绝缘子进行了表面电位的测量,研究了不同极性、不同幅值电压以及极性反转情况下表面电荷的积聚现象,并对表面电荷的消散进行了测量。实验结果表明:绝缘子表面电荷分布与所施电压极性密切相关;在0.5 MPa空气中,随着施加电压幅值(+40~+70 kV)增加,绝缘子表面电荷急剧增加(负电位最大处从-200 V增加到-3 000 V);在0.5 MPa空气中,先后施加+70 kV及-40 kV电压,绝缘子局部表面电荷激增现象明显(正电位最大处由500 V增大到超过2 500 V);在0.1 MPa空气中施加+40 kV电压,在0~300 min内,绝缘子表面电荷消散近似指数衰减过程,时间常数约为104 s数量级。
[Abstract]:It is a key technology to study the charge accumulation on insulator surface under DC voltage and its suppression measures in the development of DC gas insulated pipeline transmission line (Gil). Therefore, a system for measuring the surface charge of a basin insulator is established. The surface potential of epoxy resin insulator with DC voltage is measured by electrostatic probe method, and the polarity of the insulator with different polarity is studied. The phenomenon of surface charge accumulation under different amplitude voltage and polarity reversal is measured and the dissipation of surface charge is measured. The experimental results show that the charge distribution on the insulator surface is closely related to the polarity of the applied voltage, and increases with the applied voltage amplitude (40 ~ 70 kV) in 0.5 MPA air. The surface charge of insulator increases sharply (the maximum negative potential increases from -200 V to -3 000 V), and 70 kV and -40 kV voltages are applied successively in 0.5 MPA air. The local surface charge surge of insulator is obvious (the maximum positive potential is increased from 500V to more than 2500V), and when 40kV voltage is applied in the air of 0.1 MPA, the surface charge dissipation of insulator is approximately exponential decay process within 0 ~ 300 min. The time constant is about 104 s.
【作者单位】：清华大学电机工程与应用电子技术系;清华大学电力系统及大型发电设备安全控制和仿真国家重点实验室;中国电力科学研究院;
【基金】：国家重点基础研究发展计划(973计划)(2014CB239502)~~
【分类号】：TM216

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