Development and Application of Automatic Selection for Small Current Neutral Grounding Fault

摘要

Jinan Power Supply Company has already built a complete distribution automation system and realized some basic functions. However the detection (including positioning and wire selection) of small current neutral grounding fault remains unsolved up till now. This paper elaborates the development and application of this system. Through the determination of distribution network fault and intensive study of isolation principle, on the basis of the existing distribution network, the software and hardware have undergone necessary upgrading and transformation so that the functions such as the automatic positioning of small current neutral grounding fault, isolation and restoring power supply for the whole section to guarantee stability, security and economical operation on the part of Jinan power distribution network.