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 arrester voltage distribution has been fully solved by the rational design of grading ring.