Different-line in-phase two-point grounding fault line selection method and system and storage medium

• Main Authors: GU BO, LIU JIANZE, LU MING, TIAN QINGYANG, ZHU ZHONGSI, LI CHANGJUN, GU XINRAN, QI HAIXING, LI NINGQI, LIU YANG, MA XIAO, WEI KAI, XU KAI, GUAN WEN, YU ZAIMING, BI JUNJIE, CHI JINGYUAN, WANG CHAO, DU KUNYANG, MA QIANG, LIU ZHIYU, LI GANG, QU YAN, TIAN JINGFU
• Format: Patent
• Language: Chinese; English
• Published: 25.06.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a different-line in-phase two-point grounding fault line selection method and system and a storage medium, and the method comprises the steps: employing a zero-sequence voltage break variable to start a criterion, detecting whether the zero-sequence voltage of a system bus reaches a preset threshold or not, and judging whether a first grounding fault occurs or not; if the system has transfer between zero-sequence current, judging that the single-point grounding fault of the system line is developed into an in-phase two-point grounding fault; extracting zero-sequence current signal data in a specific time range of the first and second grounding faults and performing assignment; performing measurement algorithm analysis based on Euclidean distance, and determining a general expression of fault line selection; and calculating the Euclidean distance corresponding to the zero-sequence current signals of the first and second earth faults, comparing the reference value, and judging the specif