High-voltage transmission line zero-sequence parameter online measurement method based on reclosing

The invention discloses a reclosing-based high-voltage power transmission line zero-sequence parameter online measurement method, and relates to the technical field of high-voltage power transmission line zero-sequence parameter online measurement, and the method comprises the steps: calculating a single-circuit power transmission line zero-sequence impedance parameter, and the calculation steps are as follows: supposing that a single line between M and N is a line to be measured, and M'and N 'are the positions of a circuit breaker of the line to be measured; artificially manufacturing a single-phase disconnection state of the line, and respectively obtaining three-phase voltage data at an M'position of the line and three-phase voltage and three-phase current data at an N side of the line; converting the obtained data into a vector form by using a Fourier algorithm; decoupling the three-phase electric quantity by using a symmetric component method to obtain a zero-sequence voltage component and a zero-sequenc