750kV同塔双回输电线路相序排列方式的研究

Study on Phase-order Arrangement of 750 kV Double Circuit Transmission Line in Same Tower

同塔双回输电线路的相序排列方式对线路的电磁环境和防雷性能有较大影响。本文以750kV兰州东—平凉同塔双回输电线路为例,计算了同塔双回、每回竖直排列线路各种相序排列方式线路的导线表面场强、地面电场、无线电干扰、可听噪声、电晕损失、反击跳闸率等线路设计时需要重点考虑的参数。结果表明:两回线路以ABC/ABC和ABC/BAC相序排列时线路电磁环境最好、电晕损失最低:而ABC/ABC和ABC/ACB两种相序排列的双回反击跳闸率远高于其他相序排列方式。因此从改善线路电磁环境、降低电晕损失、改善防雷性能几方面出发,建议同塔双回、每回竖直排列线路尽量采用ABC/BAC相序排列方式。

The phase-order arrangement of double circuit transmission line has comparatively great effect upon electromagnetic enviroment and lightning performance. By taking 750 kV Lanzhoudong-Pingliang double circuit transmission line as example, the parameters to be considered in design are calculated under different phase-order arrangement of double circuit transmission line with vertical-arranged circuit, such as conductor surface field strength, ground electric field, radio interference, audible noise, corona loss and counterattack trip rate. The results show that the electromagnetic environment is best and corona loss is lowest under ABC/ABC and ABC/BAC arrangement, while counterattack trip rate of double circuit transmission line under ABC/ABC, ABC/ACB arrangement is much higher than that under other phase-order arrangements. Therefore for improving electromagnetic environment, reducing corona loss, improving lightning performance, it is suggested to adopt ABC/BAC phase-order arrangement when constructing double circuit transmission line with vertical-arranged circuit.