Defects and Preventive M easures of Zero Sequence Protection in Small Resistance Grounding System

This paper analyzes the connection mode of neutral point grounding through resistance, theprinciple of zero sequence protection and the misoperation and refusal of zero sequence protectionin various modes. Combined with examples, this paper analyzes the dead zone of cable outgoingzero sequence protection in small resistance grounding system, and puts forward effective remedialmeasures.