METHOD FOR DIAGNOSTICS OF CABLE POWER TRANSMISSION LINE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01R31/08 G01R31/58 

FIELD: electric power industry.

SUBSTANCE: invention relates to monitoring and diagnostics of cable power transmission line insulation, in order to assess the residual life, detect damage and prevent possible breakdowns, ground fault and short circuits. Measurement, comparison and analysis of partial discharges from several capacitive sensors located along the cable power transmission line is performed. Each of the sensors is connected to the corresponding filter converter of the diagnostic device. Place of its origin is determined from the largest value of the partial discharge signal from the capacitive sensor. In addition, leakage current of insulation of cable power transmission line is measured, which is obtained from voltage drop on resistive sensor. One end of the resistive sensor is connected to the armored cover or wire screen of the cable, and the other end is grounded. Signals from both ends of the resistive sensor are transmitted to the inputs of the voltage converter of the diagnostic device. Output of the voltage converter is connected to the first input of the comparison circuit, to the second input of which the first output of the setting unit is connected, and the second output is connected to the first input of the computer. Other inputs of the computer are connected to the corresponding outputs of the converters-filters. First output of the computer is connected to the first input of the display, and its second output is connected to the first input of the signaling element, to the second input of which the first output of the comparison circuit is connected. Second output of the comparison circuit is connected to the second input of the display.

EFFECT: simple and reliable reception of a partial discharge signal for timely detection and accurate determination of the point of an incipient critical defect owing to introduction of capacitive and resistive sensors.

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