METHOD FOR DETERMINATION OF SHORT-CIRCUIT LOCATION AT OVERHEAD TRANSMISSION LINES AGAINST ARRAYS OF INSTANTANEOUS CURRENT AND VOLTAGE VALUES Russian patent published in 2014 - IPC G01R31/08 

FIELD: electricity.

SUBSTANCE: arrays of instantaneous current and voltage values are measured for voltage and current signals of three phases at the beginning and end of the line for the same time moments. Signals are transmitted from the end of line to its beginning via communication channel. Pairs of digital readouts are stored as current ones. Signal of phase B is shifted per angle of 120 degrees while phase C is shifted per angle of 240 degrees. Thereafter arrays of instantaneous values are determined for symmetric components of voltage and current at the beginning and end of the line with their vector values U_A1.1, I_A1.1, U_A1.2, I_A1.2. Then distance to short circuit location I₁ is determined according to the following formula: where γ₀=a₀+jβ0 is EM wave propagation factor, a₀ is EM wave attenuation factor, β₀ is EM wave phase-change coefficient, Z_i is iterative impedance of the line, l is line length.

EFFECT: increased accuracy of damage spot detection.

7 tbl, 2 dwg