METHOD OF DETERMINING POINT OF FAULT IN POWER TRANSMISSION OR COMMUNICATION LINE AND DEVICE FOR REALISING SAID METHOD Russian patent published in 2010 - IPC G01R31/11 

FIELD: physics.

SUBSTANCE: method involves transmission of time-frequency modulated probing voltage pulses from a generator to a transmission line and reception of reflected pulses. The array of demodulated reflected signals from non-faulty line is recorded in form of an electronic image of the line. Autocorrelation processing and spectral analysis are carried out and frequencies corresponding to pulses reflected from natural non-uniformities are determined. Frequency values and their corresponding distances to natural non-uniformities are recorded in form of reference points. In order to detect faults, demodulated pulses reflected from natural non-uniformities and non-uniformities arising from faults in the line are subtracted from those in the electronic image of the line. Fault in the line is indicated by presence of difference signals. The difference signal undergoes autocorrelation processing and spectral analysis. Frequency F_x corresponding to the coordinate of the fault is determined. The distance to the point of fault is determined from the frequency F_x and reference points.

EFFECT: high accuracy and uniqueness of determining point of fault in a branched line and in automation of the measurement process.

2 cl, 12 dwg