Performance improvement of MO surge arrester using high gradient arrester block against VFTOs

K. Raju
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Abstract

It is well known that the metal oxide surge arrester is inoperative against very fast transients overvoltages (VFTOs) because of its strong stray capacitive effect. This stray effect causes a time lag between the peak of residual voltage and peak of the current surge and so there is a delay its response. In order to reduce the stray effect, high gradient material is used for preparing metal oxide arrester blocks with different compositions. For simulation study, the required electrical parameters of high gradient arrester blocks are calculated with estimated height of arrester. This model is simulated using Electromagnetic transient program (EMTP) for different arrester ratings against switching, lightning, steep and very fast transients. The simulated value of residual voltages are compared with experimental values. From the observed results, it is perceived that the newly developed high gradient arrester decreases the delay and so the dynamic performance of the arrester is improved especially against very fast transients.
采用高梯度避雷器块对vfto的MO避雷器性能改进
众所周知,金属氧化物避雷器由于其强烈的杂散电容效应,对极快瞬态过电压不起作用。这种杂散效应导致剩余电压峰值和电流浪涌峰值之间的时间滞后,因此存在延迟其响应。为了降低杂散效应,采用高梯度材料制备不同成分的金属氧化物避雷器块。为了进行仿真研究,根据估计的避雷器高度,计算出高梯度避雷器块所需的电气参数。该模型使用电磁瞬变程序(EMTP)对不同避雷器额定值进行了模拟,以抵抗开关、闪电、陡峭和非常快的瞬变。并将剩余电压的模拟值与实验值进行了比较。从观测结果可以看出,新研制的高梯度避雷器减少了延迟,从而提高了避雷器的动态性能,特别是在非常快的瞬变情况下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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