2012•Guangdong Electric PowerRequires access
Analysis on Unbalance of 110 kV Six-circuit Transmission Lines on the Same Tower
Changhui Yang
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Abstract
This paper elaborates on three-phase unbalance caused by incomplete transposition of six-circuit transmission lines on the same tower and its influence on safe operation of lines or even the entire power system.By using MATLAB,order parameter and unbalance factor of 110 kV six-circuit transmission lines on the same tower are calculated.On the basis of determined line property,influence of different layouts of phase sequence on unbalance of multi-circuit transmission lines is analyzed.Through comprehensive comparison and analysis,it is concluded that all unbalance factors of six-circuit transmission lines on the same tower are comparatively small in reversed sequence mode and throughtype electromagnetic unbalance factor in particular,hence it is preferentially recommended.