Abstract
At present, threr is no effective solution to the problem that the three-phase unbalance of multi-circuit transmission lines on the same tower. Based on the distributed parameter model of transmission line, the analysis model of double-circuit transmission line on the same tower is established and the optimal phase sequence arrangement is proposed considering the influence of overhead ground wire, reactive power compensation device and series reactor. The active and reactive power and three-phase current of 220 kV Hexi-Liucun double-circuit line and 500 kV Changzhi-Jiu'an II/III double-circuit line are analyzed and calculated. The results show that the error between calculated results and measured values is less than 1%, and the phase sequence arrangement with the minimum unbalance degree of He-Liu and Chang-Jiu II/III double-circuit is proposed, which provides theoretical reference for the optimal phase sequence arrangement of double-circuit transmission lines on the same tower.
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