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KEYWORD: Parallel transmission line; Unbalanced Current; Inductor Model ABSTRACT: Unbalance phase current appeared in the 500kV overhead transmission line during the system commission of ± 800kV Binjin UHV DC transmission project. An inductor model of parallel lines on same tower was established for theoretical analysis. Electromagnetic transient model was al- so established in EMTDC/PSCAD. Both theoretical analysis and simulation result pointed that: the inappropriate overhead line arrangement of tower induces the unbalance phase current. The mechan- ism of unbalance phase current was revealed and optimal arrangement of parallel transmission line on same tower was given.

Research on Unbalance Phase Current of 500kV AC Transmission Line in Yibin UHV Converter Station