Automatic fault line selection technology for small current grounding system
The low voltage distribution network in our country widely adopts non-direct grounding system, called as small current grounding system. Single-phase ground fault is the most common occurrence for this system. Now, some power supply departments in our country still recognize fault lines by traditional artificial method, meaning low efficiency and accuracy. To improve the efficiency and reliability of fault line selection for small current grounding distribution network, fast and accurate automatic fault line selection method has always been an important research topic in power system. This paper analyzes current researches of automatic fault line selection methods for small current grounding distribution network, and comprehensively compares the current methods. Besides, based on travelling rule researches of fault travelling wave, a fault line detection approach based on travelling wave natural frequency and amplitude information is put forward in this paper, providing useful reference for scholars.