FIELD: electricity.
SUBSTANCE: orthogonal components of minimal line-to-line voltages in various points of branched high-voltage line are measured simultaneously under line-to-line fault, at the same time minimal line-to-line vector values are measured. Using known values of complex resistance between these points maximum vector values of phase current difference on these sections are determined. Using these values maximum difference of phase current of faulted section close to fault point is determined. Distance to fault point from the closest voltage measurement point where obtained current passes is determined. During such calculation unfaulted phases load currents are considered and accuracy of distance calculation increases. Currents measurement is not required and there is no necessity to use current transformers operating in nonlinear modes under high fault currents.
EFFECT: increasing accuracy of measurement of distance to fault location in branched high-voltage lines.
4 dwg
