Method for estimating insulation life of XLPE cable based on double-ended balance factor

Abstract

The invention relates to a method for estimating the insulation life of an XLPE cable based on a double-ended balance factor. The method comprises the steps of firstly, building a cable leakage current test platform to carry out leakage current testing on an XLPE cable which operates for a long time; respectively calculating the disturbance rate, the offset rate and the displacement coefficient ofa 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, calculatinga leakage current difference factor to estimate the insulation life of the XLPE cable. The beneficial effects of the invention are that the insulation life of the to-be-tested XLPE cable can be evaluated accurately, simply and conveniently in real time, especially for the XLPE cable which operates for a long time, the frequency of power failure maintenance can be effectively reduced, the safe andreliable operation of an in-operation cable is guaranteed, the power failure frequency and time of a power grid are reduced, and the reliable operation of the power grid is guaranteed.

Description

technical field [0001] The invention belongs to the field of cable insulation aging state evaluation, and in particular relates to a method for estimating the life of an XLPE cable insulation based on a double-end balance factor. 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 st...

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.

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