±550 kV直流GIS多柱并联避雷器螺旋结构自生电感均流特性研究OA

In order to solve the problem of uneven current distribution in multi-column parallel energy ab-sorption of±550 kV DC GIS arrester,a multi-column parallel arrester with spiral arrangement structure of zinc oxide resistor is proposed.The spiral arrangement of zinc oxide resistors can not only effectively shorten the length of arrester,but also reduce the stress impact of offshore platform vibration on DC GIS arrester.At the same time,the self-generated inductance of the spiral structure resistor can reduce the non-uniformity of the current distribution of each column when the multi-column parallel energy absorp-tion.Firstly,the spiral structure parameters of±550 kV DC GIS multi-column parallel arrester are de-signed,and the multi-physical field simulation model of the arrester is established.The self-generated in-ductance under the spiral arrangement structure of zinc oxide resistors is calculated.The influence of self-generated inductance on the current distribution when the multi-column parallel arrester absorbs energy is further studied.The research results show that the self-generated inductance of the single-column core spiral structure of the±550 kV DC GIS arrester is 4.6 μH,which can reduce the deviation coefficient of the current of each column when the multi-column parallel energy absorption of the arrester is reduced by 20％～65％,which verifies the effectiveness of the self-generated inductance current sharing of the multi-column parallel arrester spiral structure resistor.