Arc suppression coil grounding device and its application in substation design

As the development of power supply system, especially the adding of cable lines, single-phase grounding capacitive current has increased greatly. This causes capacitive current too large to suppress coil automatically when sigle-phase grounding fault occurs. Whether or not equip arc suppression coil and how to use it are decided by system dynamic capacitance to earth. And the adaptability, reliability and advantage become the main criterion of arc device selecting. This paper not only briefly introducesworking principles and characteristics of several kinds of domestic arc suppression coil at present, but also illustrates the calculation and measuring approaches of grounding capacitive medium-voltage distribution system, and the distribution planning and capacity calculation of arc suppression coil. Some suggestions about the design of grounding transformer and arc-suppression coil system are put forward.