Method for detecting service life of cable

Abstract

The invention provides a method for detecting the service life of a cable. The method is used for detecting the service life of the cable respectively in three different detection ways as follows: measuring an isothermal relaxation current in a cable depolarization process, and calculating an aging factor to obtain a first service life value; carrying out thermal aging treatment on a cable sample, and measuring the thermal aging failure time and the corresponding aging temperature to obtain a second service life value of the measured cable under the rated working temperature; applying a breakdown voltage to the measured cable to obtain a third service life value; and accurately determining the average service life of the measured cable according to the three measured service life values. As the influence of electric polarization, thermal aging and voltage breakdown on the service life of the cable is respectively considered by parameters involved in detection, the measured service life of the cable is more accurate.

Description

technical field [0001] The invention relates to the technical field of power system detection, in particular to a cable service life detection method. Background technique [0002] The research on the life of cables has always been the focus of attention in the power industry. In my country, power cables, especially XLPE insulated power cables, have been used for many years, and the number of high-voltage XLPE cables with a running time of more than 10 years has also been large. In some areas, 110kV XLPE cables have been running for more than 10 years. The above length is hundreds of kilometers, and these cables come from different manufacturers and different laying conditions and operating conditions, etc., the current quality and life status are also different. Accurately knowing the quality status of these cables is of great significance to the safe operation of the power grid and the planning of the power grid in the future. [0003] At present, for the life assessment ...

AI Technical Summary

Problems solved by technology

[0004] However, each method has its own advantages and limitations. Each method focuses on different parameters for characterizing cabl

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