500 kV同塔四回输电线路的感应电压和感应电流

为了缓解输电线路走廊资源紧缺与电力输送能力不足之间的矛盾，珠三角地区建设了大量的同塔四回输电线路。以广东地区500 kV顺江同塔四回路线路为例，计算了检修线路上产生的感应电压和感应电流。计算结果表明：与同塔双回线路相比，由于同塔四回线路各导线之间的耦合作用加强，检修线路上的感应电压和感应电流显著增加，静电感应电压可达运行线路工作电压的12%，电磁感应电流也可达到运行线路载流量的6%，超过IEC和国标中B类接地开关的额定值。分析了停运线路组合方式和线路长度对感应电压和感应电流的影响，合理选择停运回路的组合方式和同塔四回路段长度，可以有效降低检修线路上的感应电压和感应电流。

Induced Voltage and Current of Transmission Line of 500 kV Quadruple-Circuit in One Tower

In order to solve the contradiction between the shortage of electric power corridors and power transmission capacity, large numbers of quadruple-circuits in one tower have been constructed in the Pearl River delta region. Taking Shunjiang 500 kV quadruple-circuit in one tower in Guangdong province as an example, this paper calculated the induced voltage and current of the maintained line. The results show that the induced voltage and current of quadruple-circuit in one tower are higher than those of double-circuit in one tower, the electrostatic induction voltage is up to 12% working voltage of operation lines, and the electromagnetic induction current is up to 6% current-carrying capacity of operation lines, which exceed the rated value of grounding isolators according to the IEC standard and the national standard. Furthermore, this paper analyzed the influence of transmission line maintenance arrangement and length on the induced voltage and current. It is an effective method to decrease the induced voltage and current of the maintained line by reasonably arranging the maintenance and setting the length of quadruple-circuit in one tower.