750kV同塔双回线路接地开关的选择

针对沙湖 750 kV 输变电工程中银川东-沙湖同塔双回路线间耦合较强的问题,利用电磁暂态分析软件 ATP-EMTP 建立仿真模型并对同塔双回线路的感应电压和感应电流进行了计算,结合 IEC 标准和接地开关订货技术条件,提出了本工程接地开关的参数要求。计算和分析结果表明:对于长距离、大传输容量且装设有高压并联电抗器的 750 kV 同塔双回线路,静电感应电压和电磁感应电流有可能会超过 B 类开关限值,这两个参数对线路两端接地开关选型起主导作用。

Selection for grounding switch of 750 kV double circuit transmission line on the same tower

In light of coupling stronger between double circuit line on same tower from YinchuanEast to Shahu in Shahu 750 kV transmission and transformation project,builds simulation modelwith electromagnetic transient analysis software calculates induced vlotage and induced current ondouble circuit line on same tower. Through analysis results and combining with IEC standard andorder goods technique condition of grounding switch,puts forward parameter demand on groundingswithch of the project. The results show that for 750 kV double circuit line on same tower with longdistance,large transmission capacity and installed high voltage shunt reactor,static induced voltageand electromagnetic induced current may surpass limiting value of B type,the two parameters play aleading role in grounding switch type selection on both ends of transmission line.