A Single-Phase Ground Fault Line Selection Method in Active Distribution Networks Based on Transformer Grounding Mode Modification

Shi Su, Qingyang Xie, Pengfei Ma, Yuan Li, Fahui Chen (), Jing Zhang, Botong Li and Changqi Wang
Additional contact information
Shi Su: Electric Power Research Institute, Yunnan Electric Power Grid Co., Ltd., Kunming 650217, China
Qingyang Xie: Electric Power Research Institute, Yunnan Electric Power Grid Co., Ltd., Kunming 650217, China
Pengfei Ma: Electric Power Research Institute, Yunnan Electric Power Grid Co., Ltd., Kunming 650217, China
Yuan Li: Electric Power Research Institute, Yunnan Electric Power Grid Co., Ltd., Kunming 650217, China
Fahui Chen: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Jing Zhang: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Botong Li: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Changqi Wang: School of Carbon Neutrality Science and Engineering, Anhui University of Science and Technology, Hefei 231131, China

Energies, 2024, vol. 17, issue 18, 1-13

Abstract: Reliable fault line selection technology is crucial for preventing fault range expansion and ensuring the reliable operation of distribution networks. Modern distribution systems with neutral earthing via arc extinguishing coil face challenges during single-phase ground faults due to indistinct fault characteristics and system sequence networks influenced by the grounding methods on the distributed generation side. These factors increase the difficulty of fault line selection. By analyzing the differences between the zero-sequence currents of feeder lines and neutral lines in active distribution networks with neutral earthing via arc extinguishing coil, a method for single-phase ground fault line selection has been proposed in this paper. This method involves switching from a neutral point ungrounded mode to a low-resistance neutral grounding mode using distributed generation grid-connected transformers under permanent fault conditions. Criteria based on the differences in zero-sequence current ratios before and after the grounding mode switch are established. Simulation validation using the Power Systems Computer Aided Design (PSCAD) platform has been conducted. The proposed method demonstrates strong tolerance to transition resistance, simple extraction of fault characteristic signals, and accurate fault line selection results.

Keywords: neutral earthing via arc extinguishing coil; active distribution networks; fault line detection; grounding mode modification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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