Abstract: Single phase grounding fault is the most common fault type in small current grounding distribution network, but the on-site low current grounding line selection device is often difficult to meet the application requirements, affecting the rapid and accurate treatment of grounding fault. Considering that there are many low current grounding line selection manufacturers and various device forms, it is difficult to intuitively evaluate the line selection performance of different devices and make horizontal comparison, and there is no supporting basis for the selection and application of on-site line selection devices. Therefore, based on the real-time digital simulation system(RTDS), this paper establishes a test platform for small-current grounding line selection device, and carries out parallel testing of different line selection devices. Through the same test under all-round fault scenarios, it provides strong support for the pilot application of small current line selection device.

Key words: distribution network, real-time digital simulation system(RTDS), small current grounding mode, single phase grounding fault, grounding line selection