Small current grounding system fault line selection method, device, equipment and medium

• Main Authors: LIU LIZE, HEO DONG-HO, ZHU YUYONG, FENG HAO, LU LU, LYU FEIPENG, GU ZHEFEI, PENG YUBIN, DU SAN'EN
• Format: Patent
• Language: Chinese; English
• Published: 04.10.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a fault line selection method, device, equipment and medium for a small current grounding system, and the method comprises the steps: employing a transient zero-sequence current signal in a grounding process of the small current grounding system as a fault line selection characteristic parameter; the device can be suitable for three different grounding operation modes of a neutral point non-grounding system, a neutral point grounding system through an arc suppression coil, and high-resistance grounding. A road map Laplacian operator norm is adopted as a fault line selection judgment standard, the fault characteristics of a fault line and a non-fault line are obviously distinguished, and the success rate of line selection is improved; transient zero-sequence current signals are converted into circuit diagram signals, the transient zero-sequence current signals are transferred from a time domain to an atlas domain to be analyzed and calculated, and a new line selection method is provided