某实际间歇性弧光接地事故仿真分析与对策研究  

Intermittent Arc Grounding Accident Simulation Analysis and Solution Research in One Practical Distribution System

作　　者：陈筱平 刘雅洁[2] 汪颖[2] 钟涛 张大猛 

机构地区：[1]南充电业局,四川南充637000 [2]四川大学电气信息学院,四川成都610065

出　　处：《电力科学与工程》2012年第9期10-17,共8页Electric Power Science and Engineering

基　　金：四川省科技支撑计划项目(2010GZ0256)资助

摘　　要：针对实际工程中某110 kV变电站因单相接地故障引起的弧光接地过电压和铁磁谐振过电压,及其导致的多条10 kV线路电流保护和主变低后备保护动作原因与对策开展研究。用通用的电磁暂态仿真软件PSCAD/EMTDC建立了仿真模型,详细研究了间歇性弧光接地引起的过电压和故障消失激发的铁磁谐振造成的谐振过电压,并与金属性接地故障时激发铁磁谐振的情况进行了对比研究。提出PT采用二次消谐装置和系统中性点经消弧线圈接地两种消谐方法,并进行了仿真研究。结果表明,两种方法在合理配置时均能有效地消除铁磁谐振,防止类似事故的再次发生。The paper focuses on the research of an arc grounding over-vohage and ferroresonance over-voltage caused by a single-phase grounding fault and its countermeasure occurring in a practical 110 kV substation, which results in that several 10 kV lines＇ current protection and main transformer low-side backup protection trip. The electromagnetic transient simulation model is established using PSCAD/EMTDC software package. Then the study on the over-voltage resulted from intermittent arc grounding fault and the ferroresonance excited by the fault extinguishment is carried out in detail. A comparison is made between the ferroresonance over-voltage exited by an intermittent arc grounding fault and that by a metallic single-phase grounding fault. The simulation of two kinds of countermeasure, PT delta connection winding connected with resistance or frequency division resonance apparatus and connecting an arc extinguishing winding to the neural point of power system, is carried out, confirming that the two measures can suppress ferroresonance effectively if a appropriate configuration is taken.

关 键 词：间歇性接地故障 弧光接地过电压 铁磁谐振过电压 PSCAD/EMTDC 配电系统 

分 类 号：TM712[电气工程—电力系统及自动化]