Calculation of zero-sequence mutual inductance for multi-circuit parallel transmission line
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A method for calculating the zero-sequence mutual inductance of multi-circuit parallel transmission line on the same tower is proposed.It is pointed out that,the zero-sequence mutual inductance matrix is a set of independent parameters,based on which,the zero-sequence parameters of transmission line in different operation modes can be deduced by matrix transformation.Without the repeating experimental measurement,the proposed method simplifies significantly the acquisition of zero-sequence mutual inductance,which improves the work efficiency.Results of field test for a four-circuit parallel transmission line show its correctness and accuracy.