It is necessary for Chinese HV switchgears manufacturers to research and develop DC switchgears independently to meet the requirements of the rapid development of DC transmission and transformation projects in China.This paper described the development of DC transmission and the basic information of DC field equipment in China
with the emphases on the low-voltage-side 50 kV DC disconnector’s technical performance
parameters
current flux
and transmission design and calculation
as well as selection of DC insulators in order to benefit the development and design of the DC switchgears in China.