With the increasing proportion of cable lines in urban power grid and the application of arc suppression coil

when single-phase grounding fault occurs in resonant grounding system

it is faced with some problems

such as difficult line selection

long line selection time

a large number of power supply services and safety risks. A method of small current grounding line selection at dispatching station based on the improved entropy weight method is proposed. Firstly

the grounding phenomenon of small current grounding system is analyzed. Combined with the actual operation experiences

three line selection criteria suitable for the dispatching master station are proposed

and the reasonable fusion is carried out with the improved entropy weight method. Secondly

the dynamic compensation method for resonant grounding system is proposed

and the corresponding line selection flow chart is formulated. Finally

the selection method is deployed on the D5000 system at the dispatching main station of Chengdu local dispatching and verified for a long time. The results show that the proposed method has a remarkable effect and solves the line selection problems for resonant grounding system at dispatching station. It shortens 95% of the mean processing time for single-phase grounding fault and effectively improves the processing speed and accuracy of single-phase grounding fault

which has good application and popularization value.