高压电器2025，Vol.61Issue(4)：203-210,218,9.DOI:10.13296/j.1001-1609.hva.2025.04.023
500kV/220kV同塔混压四回输电线路感应电压及电流的计算与测量分析
Calculation and Measurement Analysis for Induced Voltage and Current of 500 kV/220 kV Mixed-voltage and Four-circuit Transmission Lines on the Same Tower
摘要
Abstract
The electromagnetic coupling and electrostatic induction action is very strong due to the small spacing,multiple circuits and large voltage level differences of the mixed-voltage and four-circuit transmission lines on the same tower.In order to effectively reduce the level of induced electricity,the phase sequence,layout and type selec-tion of earthing switch of the transmission line shall be reasonably designed.In this paper,a project of a 500 kV/220 kV mixed-voltage and four-circuit power transmission lines on the same tower is taken as the research object,the simulation model based on the ATP-EMTP software is set up,and the influence of the 500 kV double-circuit lines on the induced voltage and induced current of 220 kV double-circuit lines on the same tower under the interactions of such multiple factors as the operation mode,power flow of line,and phase sequence arrangement change is studied.Based on the flexible current sensing technology,the induced current of the 220 kV double-circuit lines is actually measured on site,and the accuracy of the calculation model is further analyzed and verified.The research results show that the magnitude of the power flow of 500 kV double circuit is positively correlated with the electromagnetic induced current of the 220 kV double-circuit lines on the same tower,but the influence on the static inductance level is less.In case of using the arrangement of inverse phase sequence of 500 kV double-circuit of the mixed-voltage and four-circuit on the same tower,the induced current level of the 220 kV double-circuit will be reduced significantly.While,in case of connection of the ground wire in sections,the electromagnetic induction current near the middle of the four-circuits of mixed-voltage is smaller and the junction of the two ends is larger.It has been verified by measure-ment that the the theoretical calculation value of the induced electricity is slighter larger than the actually measure value and this is related to the selected parameters of the simulation calculation,which reserves sufficient safety mar-gin for the type selection of earthing switch.A technical solution of changing the switching of induction voltage of the open type earthing switch is proposed to solve the problem of insufficient switching induced electricity of the earthing switch of GIS.The research results can provide important basis for the design of the mixed voltage multiple circuit transmission on the same tower,type selection of the grounding wire and the insufficient of switching induced electric-ity ability of the earthing switch.关键词
同塔混压四回/500kV/感应电压/感应电流/接地开关Key words
four-circuit lines on the same tower/500 kV/induced voltage/induced current/earthing switch引用本文复制引用
徐党国,李亚美,黄诗洋,宁琳如,陈霄,王晨星,蔺涛,彭兆伟..500kV/220kV同塔混压四回输电线路感应电压及电流的计算与测量分析[J].高压电器,2025,61(4):203-210,218,9.基金项目
国网冀北电力有限公司科技项目(52018K220018). Project Supported by Science and Technology Project of State Grid Jibei Electric Power Co.,Ltd.(52018K220018). （52018K220018）
