A method for estimating the insulation life of xlpe cable based on double-ended balance factor

Abstract

The invention is a method for estimating the insulation life of an XLPE cable based on a double-ended balance factor. The invention first builds a cable leakage current test platform to test the leakage current of a long-running XLPE cable; then calculates No. 1 high-frequency current transformer (5 ) disturbance rate, offset rate, displacement coefficient and No. 2 high-frequency current transformer (7) offset rate, displacement coefficient, disturbance rate; finally calculate the leakage current difference factor to estimate the XLPE cable insulation life. The beneficial effect of the present invention is that the insulation life of the XLPE cable to be tested can be evaluated in a real-time, accurate and simple manner, especially for the long-term running XLPE cable, which can effectively reduce the number of power outage maintenance and ensure the safe and reliable operation of the cable in operation. Reduce the frequency and time of power outages in the power grid to ensure reliable operation of the power grid.

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.

Images