基于稳态信息融合的小电流接地系统故障选线方法
蒋连钿，田君杨，李海勇，沈梓正
（广西电网电力调度控制中心，广西 南宁 530023）
摘要： 小电流接地系统单相接地故障的故障率占配电网故障的80%，传统的单一选线法无法稳定地提高准确率或需
要加装监测设备，增加了投资和设备维护成本。针对这一特点，结合电网实际调度主站端数据，用PSCAD/EMTDC 电磁
暂态仿真软件搭建了10 kV 配电网仿真模型采集电流、无功功率等稳态信息数据，提出了一种基于稳态信息融合的单相
接地故障选线方法，得到了较高的准确率。对仿真数据进行验证，该方法适用于不接地系统及谐振接地系统，在调度主
站端处进行选线有着较好的应用前景。
关键词： 故障选线；小电流接地系统；零序电流；无功功率及电流变化量；PSCAD/EMTDC；Z-分数
中图分类号： TM727     文献标识码： A     文章编号： 2095-0802-(2021)11-0095-06
Fault Line Selection Method for Small Current Grounding System Based on Steady State
Information Fusion
JIANG Liandian, TIAN Junyang, LI Haiyong, SHEN Zizheng
(Guangxi Power Grid Dispatching Control Center, Nanning 530023, Guangxi, China)
Abstract: The single-phase grounding fault rate of small current grounding system accounts for 80% of the distribution network
fault. The traditional single line selection method can not stably improve the accuracy or need to install monitoring equipment,
which increases the investment and equipment maintenance cost. In view of this characteristic, combined with the actual dispatching
master station data of the power grid, this paper established a 10 kV distribution network simulation model with PSCAD/
EMTDC electromagnetic transient simulation software, collected the steady-state information data such as current and reactive power,
and proposed a single-phase grounding fault line selection method based on steady-state information fusion, which obtained
high accuracy. The simulation data were verified. This method is suitable for ungrounded system and resonant grounded system. It
has a good application prospect in line selection at the end of dispatching master station.

Key words: fault line selection; small current grounding system; zero sequence current; reactive power and current variation;
PSCAD/EMTDC; Z-score