超特高压同塔4回输电线路工频电场强度的计算

通过对输电线路适当等效建模,应用模拟电荷法在输电线内部设置模拟线电荷,计算了超特高压同塔4回线路的导线表面电场强度和距地面1.5m处的工频电场强度,并与目前的特高压双回鼓型塔、单回猫头塔、单回酒杯塔和单回紧凑塔进行比较。结果表明,同塔4回线路的导线表面电场强度不高于其他塔型,同时地面工频电场强度要明显小于其他塔型。其理论依据为同塔的500kV导线屏蔽了1 000kV导线在地面方向的大部分电场。

Calculation of Electric Fields of EHV/UHV Transmission Lines with Four Circuits on the Same Tower

After modeling a transmission line with double 1 000 kV circuits and double 500 kV circuits on the same tower, electric field intensity on the wire surface of the 4 EHV/UHV circuits and the filed at 1.5 m above ground are calculated. By setting charges in the transmission lines with a charge simulation method, the current UHV double circuits drum power, single circuit cat head tower, single circuit glass tower, and single circuit compact tower are compared with this four circuit transmission lines. The results show that the electric field intensity on the transmis sion line surface of the circuits is no higher than the other towers. Meanwhile, the power frequen cy electric field intensity on the ground is clearly less than the other towers. The theoretical basis is that 500 kV wires on the same tower shield the majority of electric field in the ground direction of the 1 000 kV wires.