FIELD: energy.
SUBSTANCE: invention relates to power industry and can be used to determine the location of short circuit with simultaneous break of wire. Concept of the invention is as follows: at preliminary stage, full line model is constructed in three-phase form with taking into account mutual inductance and capacitance coupling between wires of lines. In case of wire breakage with a simultaneous short circuit, values of complex phase voltages on buses and phase currents in line are measured and recorded. Then, the line model of equal segments is constructed, for example, from support to support, voltages are generated and stored at the end of each segment in each phase, starting from buses from one and another ends of the line. Modules of the voltages and currents are in each segment in each phase, starting from buses from one and another ends of the line. Three graphics of currents at one end and three graphics of currents at the other end are obtained for three phases, three graphics of voltages at one end and three graphics of voltages at the other end are obtained for three phases. graphic of that phase and at that side where the curve looks like a broken line contacting the axis of distances in the breakpoint is selected according to the graphics of currents. This point is a point of the wire breakage. Graphic of that phase and at that side where the curve looks like a broken line which runs close to the axis of distances in the breakpoint is selected according to the graphics of voltages. This point is a point of short circuit with simultaneous break of wire in case of transient resistance, which is equal to zero. If the transient resistance differs from zero, the breakpoint is shifted from the point of short circuit. In this case the point of short circuit is precised according to the graphics of voltages of undamaged phases, where the point of graphics intersection corresponds to the point of short circuit with simultaneous break of wire.
EFFECT: technical result is decreased labour intensity and increased accuracy due to more complete consideration of lines parameters.
1 cl, 7 dwg
