METHOD OF DETERMINING POINT OF DAMAGE ON ELECTRIC POWER LINES WITH LARGE AMOUNT OF DISCONTINUITY Russian patent published in 2018 - IPC G01R31/11 

FIELD: measuring equipment.

SUBSTANCE: invention relates to an electrical measuring technique and can be used to determine the distances to fault sites and non-uniformity of transmission lines. Essence: probing voltage pulses are sent to the test line, they receive reflected signals, and store them in the form of an exemplary reflectogram. To locate the fault, the current trace is taken. Then the current trace is subtracted from the sample trace. Fault in the line is indicated by presence of difference signals. Sample trace, as well as the current waveform, represent the voltage values obtained through the time sampling step, which are stored in memory cells in a floating-point format. Entire measuring interval of time is divided into a number of partial time intervals, which are multiples of the time step of the discretization. Before each measurement cycle of obtaining the sample trace and the current trace, an estimation is made of the optimal transmission coefficients of the input device for each partial time interval. To do this, by setting the minimum transfer factor of the input device, an intermediate trace is obtained, with which for each partial time interval the maximum permissible input transmission factor is selected. In the process of obtaining the sample trace and the current waveforms for each partial time interval, the selected input device transfer ratio is set using high-speed switches.

EFFECT: increased sensitivity to inhomogeneities or to insignificant local deterioration of insulation resistance.

1 cl, 1 dwg