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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Dynamic behavior of surface charge on double-layer oil-paper insulation under pulse voltage
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Dynamic behavior of surface charge on double-layer oil-paper insulation under pulse voltage

机译:脉冲电压下双层油纸绝缘表面电荷的动态行为

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摘要

Oil-paper insulation system is an extraordinarily essential system of converter transformers as well as HVDC bushings. When the system changes its state, such as switching the thyristors, operating over-voltage appears, and the charge will deform the dielectric internal electric field, thus easily leading to the occurrence of discharge or insulation failure, so charge accumulation and dissipation on oil-paper insulation under pulse voltage need more investigation. This paper studies the surface charge behavior on double-layer oil-paper insulation under pulse voltage and inducing electrification was used to charge the oil-paper composite. Studies of various voltage amplitudes, pulse frequencies, numbers and polarities showed that the decay is fast initially, and then becomes slower with the time. Eventually the dissipation of charge behaviors tends to be flat. With the increase of voltage amplitudes, the surface potential rises, and less positive charges are accumulated on the surface than negative charges. The increase of the pulse frequency causes the initial values of surface potential a little smaller and the charge to dissipate more quickly. Also, with the increase of pulse numbers, the initial value gets bigger and the surface charge would be slowly dissipated. From the tdV/dt and decay time curves, the figures of positive voltage usually have two peaks, while there is only one peak in most of the curves under the negative one. With the increase of voltage amplitudes, the charge will dissipate more quickly. Additionally, the peak value and the characteristic time increase with the reduction of pulse frequency and the addition of numbers.
机译:油纸绝缘系统是换流变压器以及高压直流输电套管的必不可少的系统。当系统改变其状态(例如切换晶闸管)时,会出现工作过电压,并且电荷会使电介质内部电场变形,从而容易导致发生放电或绝缘故障,因此电荷在油上积聚和耗散,脉冲电压下的纸绝缘需要更多的研究。研究了脉冲电压作用下双层油纸绝缘层的表面电荷行为,并利用感应带电对油纸复合材料进行充电。对各种电压幅度,脉冲频率,数量和极性的研究表明,衰减开始时很快,然后随时间变慢。最终,电荷行为的耗散趋于平坦。随着电压幅度的增加,表面电势升高,并且与负电荷相比,在表面上积累的正电荷更少。脉冲频率的增加导致表面电势的初始值略小,并且电荷耗散更快。另外,随着脉冲数的增加,初始值变大,表面电荷将缓慢消散。从tdV / dt和衰减时间曲线来看,正电压的数字通常有两个峰,而在负曲线下的大多数曲线中只有一个峰。随着电压幅度的增加,电荷将更快地耗散。另外,峰值和特征时间随着脉冲频率的降低和数字的增加而增加。

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