METHOD FOR ONE-SIDED WAVE DETERMINATION OF THE LOCATION OF DAMAGE OF POWER LINE Russian patent published in 2022 - IPC G01R31/08 

FIELD: electrical engineering.

SUBSTANCE: invention relates to measurements in electrical engineering and can be used to determine the location of a fault on a power transmission line (PTL). Phase currents and phase voltages at the place of measurements are linearly converted into a current signal and a voltage signal, a controlled signal is formed, and the moment of occurrence of the first wave front is determined in it. At a given time interval, counted from the moment of occurrence of the front of the first wave, the polarity of the wave fronts in the controlled signal is determined and, taking into account the polarity, the working wave fronts are selected and their moments of occurrence are determined. For the correct selection of the working fronts of the waves, the wave impedance of the electrical system adjacent to PTL at the place of measurement of phase quantities is determined and compared with the wave impedance of the power transmission line. If the said wave resistance of the electrical system is less than the wave resistance of PTL, then the workers are taken to be wave fronts whose polarity coincides with the polarity of the first wave front, and if not, then wave fronts whose polarity is opposite to the polarity of the first wave front. For each working wave front, the estimated damage location is determined by multiplying the wave propagation velocity in the power transmission line by half the duration of the interval between the moments of the working front and the first wave front. For the place of damage, one of the alleged places is taken, which is located closer to the place of damage, determined in a different way. Linear conversion of phase currents and phase voltages at the measurement site into a current signal and a voltage signal is performed according to one of the Clarke, Karrenbauer or Wedpole transformation rules, followed by fundamental blocking. The impedance of the electrical system adjacent to PTL at the place of measurement of phase values ​​is determined either as the reciprocal of the sum of the wave conductivities of the included elements of the electrical system, determined according to the signals of the SCADA system, or as a quotient from dividing the synchronous voltage measurements by the current measurement at the fronts of the first signal waves voltage and current signal, respectively. The monitored signal may be formed as an incident or reflected wave signal, either voltage or current, or it may be the voltage signal itself or the current signal.

EFFECT: improving the accuracy of one-sided wave determination of the damage location due to the determination of the working fronts of the waves, taking into account the wave resistance of the electrical system adjacent to PTL at the place of measurement of phase values.

12 cl, 4 dwg