1000kV输电系统中性点小电抗动稳定电流的选择  

Selection of Dynamic Current of Neutral Reactor on 1000kV Transmission System

作　　者：谷定燮[1] 李振强[1] 伍志荣[1] 

机构地区：[1]国网电力科学研究院,武汉430074

出　　处：《高电压技术》2010年第10期2362-2367,共6页High Voltage Engineering

基　　金：国家"十一五"科技支撑计划重大项目(2006BAA02A02)~~

摘　　要：为使高抗中性点小电抗能够安全运行,研究了小电抗的动稳定电流的取值方法。对中性点小电抗动稳定电流的不同计算方法进行了比较分析,并用动稳定电流计算的流程图说明了各种电流值(持续工作电流、10s额定短时电流、2s额定短时电流、动稳定电流)之间的关系。计算小电抗的动稳定电流时需考虑流过小电抗最大电流的峰值,推荐采用EMTP程序直接计算动稳定电流。提出了1000kV交流同塔双回输电系统中性点小电抗的动稳定电流计算时应考虑的工况,并结合淮南—上海特高压输电系统,采用稳态计算和瞬态计算的方法,分别确定短时电流的交流分量和瞬态值,提出中性点小电抗动稳定电流要求值。The method of calculating neutral reactor dynamic current is studied to enable neutral reactor working safely.Different calculation methods of neutral reactor dynamic current are compared and analyzed,and the relations of various currents（including sustained current,10srated short-time current,2srated short-time current and dynamic current）are introduced by process figure of calculating dynamic current.It is revealed that the dynamic current depends on the peek of maximal current flowing through neutral reactor,and EMTP should be used to calculate the dynamic current.The required working conditions of calculating neutral reactor dynamic current of 1000kV AC double circuits transmission system on the same tower are put forward,moreover,based on Huainan-Shanghai UHV transmission system,the AC component and transient value of short-time current are obtained,respectively,finally,the required dynamic current value of neutral reactor is proposed.

关 键 词：1000kV 同塔双回线路 输电系统 中性点小电抗 动稳定电流 EMTP 

分 类 号：TM723[电气工程—电力系统及自动化]