基于线模相电流的串补线路故障选相方法OA

The connected series-compensated capacitors alter the sequence network impedance of transmission lines and the distribution of sequence currents during faults.While this does not adversely affect the phase-selection ele-ments on the capacitor installation side,it may lead to misidentification by those on the opposite side.To address this,a fault phase selection method based on line-mode phase current is proposed.First,the line-mode phase cur-rent is defined as the difference between the fault-component current of each phase and the zero-sequence current.Next,the characteristics of line-mode phase currents under different fault types are analyzed to extract distinctions between faulted and non-faulted phases,from which the phase-selection criterion is constructed.Finally,the method is validated through simulations on the PSCAD platform.The results show that the proposed method can ac-curately identify the faulted phase in series-compensated transmission lines,and its performance is robust with re-spect to fault location,line length,and the degree of series compensation.