Analysis and Suggestion on Neutral Grounding Mode for Shanghai Distribution Network Considering Power Supply Reliability

The demand for reliable power supply in large cities is the major concern for both consumers and company, and power outages have uprising influence on economic losses and social impacts. With the continuing growth of underground cable ratio in Shanghai, the medium-voltage distribution network structures are experiencing changes. The choice of grounding method has considerable impact on operation safety and system reliability. It is crucial to carry out in-depth and systematic analysis on different grounding modes. This paper analyzes the technical route, insulation coordination, protection configuration and system reliability for neutral grounding mode for Shanghai distribution network with regard to the development status and safety requirements of urban medium voltage distribution grid, providing effective technical principles and engineering proposals for system planning and safe operation. (paper)