新型500 kV金属氧化物避雷器电位分布研究

New 500 kV Metal Oxide Surge Arresters Potential Distribution

避雷器并联均压电容可以降低其电压分布不均匀系数,但同时也会带来外套管径变大、电场分布变为非轴对称、性能难以检验及运行可靠性下降等诸多不安全因素,因此使用均压电容往往得不偿失。随着金属氧化物电阻片性能的提高,500 kV避雷器去掉均压电容已成为一种趋势。笔者研究了一种新型500 kV金属氧化物避雷器,通过合理设计均压环完全可以解决避雷器电压分布不均匀的问题。

The shunt capacitor for surge arresters can reduce voltage distribution non-uniform coefficient, but it will also lead to bushing diameter larger, change electric field distribution to non-axisymmetric, make performance difficult to test, make the operational reliability decline, and many other factors of insecurity. Therefore, using grading capacitors are often not worth the candle. As the improvement of metal oxide varistor performance, removing grading capacitors on 500 kV arrester has become a trend. A new type 500 kV metal oxide surge arresters has been studied, the non-uniform problem of attester voltage distribution has been fully solved by the rational design of grading ring.