Abstract:

Analyzing the faulty features of the double circuit lines on the same tower and the existing conventional mutation of phase selection device that accrues in crossline fault, a new method is proposed to deal with phrase selection based on mutant phase selection of double circuit lines. After the fault of system, phase selection device should adjust the proportional relation between the offset voltage and the voltage mutation according to the magnitude of the fault current, recognize the simple fault in internal area and complex fault in external area, input phase selection device adaptively. In view of crossline fault of double circuit lines, a new phrase selection method is put forward, which effectively solve the mistaken choice of mutation phrase selection device while dealing with the crossline fault, improve the security of the power system operation, stability and reliability of the transmission.

Key words:

double circuit lines on the same tower, phase selection element, crossline fault, mutations