中性点不接地系统单相接地故障的暂态过程分析  

Transient Process Analysis of Single-phase Ground Fault in Neutral Point Undergrounded System

作　　者：周颖 Zhou Ying(State Grid Shanghai Electric Power Supply Company,Shanghai 200072)

机构地区：[1]国网上海市电力公司市北供电公司,上海200072

出　　处：《现代工业经济和信息化》2022年第8期294-296,298,共4页Modern Industrial Economy and Informationization

摘　　要：我国配电网多采用中性点不接地系统,电压互感器是其中的重要组成部分,铁磁谐振是电压互感器中经常出现的故障。从理论上分别对中性点不接地系统在单相接地故障发生和消失的暂态过程进行了深入分析,得出电压互感器一次侧过电压和过电流幅值大小的主要影响因素,是系统对地电容、单相接地故障发生时刻和消失时刻故障相的接地相角。China's distribution network mostly uses neutral ungrounded system,of which voltage transformer is an important part,and ferromagnetic resonance is a frequent fault in voltage transformer.From the theoretical point of view,the neutral ungrounded system in the single-phase ground fault occurrence and disappearance of the transient process of in-depth analysis,the voltage transformer primary side overvoltage and overcurrent magnitude of the main influencing factors,is the system capacitance to ground,single-phase ground fault occurrence moment and disappearance moment of the fault phase grounding angle.

关 键 词：中性点 不接地 单相接地故障 暂态分析 

分 类 号：TM77[电气工程—电力系统及自动化]