Grounding Fault Analysis and Protection Measures Study of Composite Grounding Arc-suppression Modes

Centering on analysis of single-phase ground fault, and based on a wide-range survey of typical structure and accessing equipment of 10kV distribution network, accurate simulation model reflecting engineering practice is established according to the existing power design standards. For composite grounding arc-suppression modes, this paper describes both the principle and fault treatment process of grounding fault transfer mode and intelligent multimode grounding mode. According to the fault treatment process, a line selection method based on the first transient half wave of fault grounding and operation grounding of the own line is put forward for grounding fault transfer mode, and the effect of transition resistance on zero-sequence current protection for intelligent multimode grounding mode is analyzed. All of this is verified by our simulation model in PSCAD. This research lays a solid theoretical foundation for the engineering application of composite grounding arc-suppression mode.