POWER SUPPLY CABLE DAMAGE IDENTIFICATION METHOD Russian patent published in 2014 - IPC G01R31/08 

FIELD: electricity.

SUBSTANCE: alternating-current source is connected to a power supply cable. Intensity of the magnet field is measured, at that measurements are made at the ground surface and at height at the beginning and ending of the cable section selected for measurements with a length L. The depth of the cable layout is calculated for the beginning and ending of the cable section. Conductivity for the surveyed cable section is defined. The obtained value of the insulation conductivity Y is compared with conductivity of the undamaged cable Y_un, the ratio Y>Y_un proves an availability of a damage of the power supply cable at the surveyed section. Then the section is divided into two parts, the measurements are repeated, conductivity values are repeated for the first Y₁ and second Y₂ parts of the section. When Y₁>Y_un, the damage is placed in the first part of the cable section; when Y₂>Y_un then the damage is in the second part. The process is repeated further till the preset (required) length of the damaged power cable section is surveyed.

EFFECT: reduced costs of labour intensity and time.

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