陈安村接地极近区地电位及电网偏磁电流计算  

Calculation of ground potential and magnetic bias current of power grid near the grounding electrode of Chen’an Village

作　　者：胡锦根 陈文强 魏华兵 朱贵池 姚晖 HU Jingen;CHEN Wenqiang;WEI Huabing;ZHU Guichi;YAO Hui(EHV Branch Company of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 311121,China)

机构地区：[1]国网浙江省电力有限公司超高压分公司,杭州311121

出　　处：《浙江电力》2022年第7期25-30,共6页Zhejiang Electric Power

基　　金：国网浙江省电力有限公司科技项目(5211MR190042)。

摘　　要：800 kV特高压直流输电系统额定工作电流大,接地极入地电流对接地极近区电网变压器的偏磁影响及治理是需要研究的课题。结合白鹤滩—浙北±800 kV直流工程的建设,利用大地电磁测深历史数据,建立浙北陈安村接地极近区大地三维电阻率模型,按5000 A入地电流工况计算接地极近区电网厂站地电位,得到浙北电网124个厂站地电位的计算结果;在此基础上,建立电网偏磁电流模型,计算偏磁电流并给出偏磁治理方案。研究结果表明,与溪洛渡—浙西±800 kV直流工程金丝接地极的影响相比,由于浙北电网输电线路相对密集、线路长度相对较短,陈安村接地极入地电流造成的影响相对较小。In view of the high operating current of±800 kV UHVDC,the influence of earth current at the grounding electrode on the magnetic bias of transformers and the treatment has become a research topic.Given the construction of the±800kV Baihetan-Zhebei DC transmission project,historical magnetotelluric detection data was used to establish a three-dimensional grounding resistivity model near the grounding electrode of Chen’an Village in northern Zhejiang province.The calculation of station ground potential of power grid near the grounding electrode was completed according to the working condition of 5,000 A grounding current,and the ground potential calculation results of 124 power plants and substations in the north Zhejiang power grid were obtained.Moreover,a power grid bias current model was established,the bias current was calculated,and a bias treatment plan was proposed.The research results show that compared with the influence of the Jinsi earth pole of the±800 kV Xiluodu-West Zhejiang DC project,the influence of the current of the grounding electrode in Chen’an Village is less because the transmission lines of North Zhejiang power grid are relatively denser and the lines are short.

关 键 词：特高压直流输电 接地极 变压器偏磁 偏磁治理 

分 类 号：TM721.1[电气工程—电力系统及自动化]