ABSTRACT
The shunt coefficient of the substation grounding system means a ratio of current diffusing into ground to short-circuit fault current. The reasonable selection of the shunt coefficient is taken as
inlet lines which are single-loop lines in the same tower, i.e. a South Zhejiang No. 1 line and a South Zhejiang No. 2 respectively on 1000 kV side; and there are four inlet lines which are double-loop lines in the same tower, i.e. a Lili No. 1 line, a Lili No. 2 line, a Ningde No. 1 and a Ningde No. 2 line respectively arranged on 500 kV side. Two main transformers are three-phase autotransformers.
