1000kV同塔双回线路高抗中性点小电抗侧中性点避雷器参数的选择  

Parameters Selection for the Neutral Arrester Beside Neutral Grounding Reactor at the Neutral Point of Shunt Reactors on 1000kV Double-circuit Line

作　　者：周沛洪 何慧雯 李振强 王磊 娄颖 ZHOU Peihong;HE Huiwen;LI Zhenqiang;WANG Lei;LOU Ying(China Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]中国电力科学研究院有限公司,武汉430074

出　　处：《高电压技术》2021年第5期1606-1616,共11页High Voltage Engineering

基　　金：国家电网公司重点科技项目(GYW17201600057)。

摘　　要：首个交流1000kV同塔双回线路皖电东送输电工程中,对线路高抗中性点小电抗侧的中性点氧化锌避雷器参数选择有两种方案:方案1选择额定电压192kV的单柱避雷器,方案2选择额定电压204kV,4柱并联的特高压形式避雷器。两种方案的分歧点在于高抗中性点避雷器上的拍频过电压应归类于代表性缓波前过电压还是工频暂时过电压。虽然偏保守,工程最终选择方案2,但是后续1000kV同塔双回线路工程研究中两种方案的争议一直存在。为了澄清争议和为特高压同塔双回线路高抗中性点避雷器参数选择提供技术依据,该文提出了中性点金属氧化物避雷器(MOA)参数选择原则,优化了方案1的参数。并在分析国标有关代表性工频和缓波前操作过电压定义以及避雷器耐受代表性过电压试验标准的基础上,结合对皖电东送输电工程拍频过电压的ATP程序仿真计算结果,提出了拍频过电压归类于代表性缓波前过电压的依据和中性点避雷器耐受拍频过电压的判据。建议交流1000kV同塔双回线路高抗中性点氧化锌避雷器可采用优化了的方案1参数,这有利于降低中性点避雷器价格和中性点设备绝缘水平,并节省工程投资。In the construction of the first 1000 kV double-circuit transmission line from the south of Anhui province to the East parts of China,there have been two different schemes on the selection of neutral metal oxide arrester beside the neutral grounding reactor at the neutral point of the line shunt reactors.In scheme 1,the single column arrester with the rated voltage of 192 kV is selected;and in scheme 2,the UHV arrester with the rated voltage of 204 kV and 4 columns connected in parallel is selected.The difference between the two schemes is whether the beat frequency overvoltage on the neutral arrester should be classified as representative slow front overvoltage or temporary power frequency overvoltage.Finally,the scheme 2 is the final choice for the project although it is conservative,however,there are always disputes between the two schemes in the follow-up study of 1000 kV double circuit transmission line.In order to clarify the dispute and provide technical basis of parameter selection for the neutral metal oxide arrester at neutral grounding reactor side,this paper puts forward the principle of selecting the parameters of neutral metal oxide arrester(MOA)and optimizes the parameters of scheme 1.Based on the analysis of the national standard definition of representative power frequency,the slow front overvoltage and the test standard of arrester withstanding representative overvoltage,the simulation results of beat frequency overvoltage for the power transmission project from Anhui province to the east parts of China by using ATP program are combined,and the basis of classification of beat overvoltage into representative slow front overvoltage and the criterion of neutral metal oxide arrester withstanding beat overvoltage are proposed.It is suggested that the optimized parameters of scheme 1 can be adopted for the neutral metal oxide arrester of 1000 k V AC double-circuit transmission lines,which is beneficial to reducing the price of neutral arrester and the insulation level of neutral equipment,and to savin

关 键 词：1000kV 同塔双回线路 中性点氧化物避雷器 拍频过电压 代表性过电压 绝缘配合 

分 类 号：TM862[电气工程—高电压与绝缘技术]