Influence of Transposing Form on Induced Voltage and Current in 1000 k V Double-Circuit Transmission Lines

The problems such as induced voltage and so on in 1 000 k V double-circuit transmission lines on the same tower were calculated and analyzed under different transposing forms. From the view point of restricting induced voltage,secondary arc current and unbalanced degree of line parameters,4 segment transposition is better than 3 segment transposition,but 1 more transposition tower is needed; while 5 segment type B transposition is better than 6 segment type A transposition and 1transposition tow er is saved. The effects of 4 segment transposition and 6 segment type A transposition are similar. Therefore,three kinds of transposing forms should be emphatically considered for double-circuit transmission lines on the same tower: 3segment transposition( l /3,l /3,l /3)),4 segment transposition( l /6,l /3,l /3,l /6)) and 5 segment type B transposition( l/6,l/6,l/3,l/6,l/6). It is not recommended to use more than 2 complete cycle transpositions in general.