Cable life prediction method based on leakage current difference coefficient

Abstract

The invention discloses a cable life prediction method based on a leakage current difference coefficient. The method comprises the steps of firstly, establishing a cable leakage current test platformto carry out a leakage current test on an XLPE cable which operates for a long time; respectively calculating the disturbance rate, the offset rate and the displacement coefficient of a first high-frequency current transformer (5) and the offset rate, the displacement coefficient and the disturbance rate of a second high-frequency current transformer (7); and finally, calculating a leakage currentdifference coefficient to predict the service life of the XLPE cable. The beneficial effects are that the high-efficiency and accurate detection of the leakage current of the XLPE cable in operationcan be conducted, the prediction of the service life of the to-be-detected cable is achieved through the method, a cable insulation breakdown accident caused by the aging or insulation defects of thecable is avoided, and a foundation can be laid for the safe operation of the cable.

Description

technical field [0001] The invention belongs to the field of cable insulation aging state evaluation, and in particular relates to a cable life prediction method based on leakage current difference coefficient. Background technique [0002] Cross-linked polyethylene (XLPE) is widely used in distribution network cables because of its simple structure, light weight, good heat resistance, strong load capacity, chemical corrosion resistance, and high mechanical strength. For XLPE cables running for a long time in the power grid, on the one hand, the external environment changes, which makes the cable insulation suffer from humidity, high and low temperature alternation, high and low air pressure, etc. Both accelerate the development of cable insulation aging and form defects such as air gaps, causing cable failures and seriously threatening the safe operation of the power grid. [0003] Therefore, in order to efficiently and conveniently evaluate the aging state of cables and r...

AI Technical Summary

Problems solved by technology

For XLPE cables running for a long time in the power grid, on the one hand, the external environment changes, which makes the cable insulation suffer from humidity, high and low temperature alternation, and high and low air pressure. Both accelerate the development of cable insulation aging and form defects such as air gaps, causing cable failures and seriously threatening the safe operation of the power grid.

Images