Cable running state assessment method and system

Abstract

Provided is a cable running state assessment method and system. The method is characterized by obtaining characteristic quantity of a cable, wherein the characteristic quantity comprises insulation resistance value, insulation resistance absorption ratio, average value of dielectric loss angle tangent values, linear fitting slope, residual sum of squares, partial discharge quantity, partial discharge quantity increment, partial discharge frequency, concentrated partial discharge point positions and harmful discharge information; judging grade of each characteristic quantity according to a preset standard; and obtaining a state assessment result according to the weight corresponding to the grade of each characteristic quantity. According to the cable running state assessment method and system, the obtained characteristic quantity comprises the insulation resistance value, the insulation resistance absorption ratio, the average value of dielectric loss angle tangent values, the linear fitting slope, the residual sum of squares, the partial discharge quantity, the partial discharge quantity increment, the partial discharge frequency, the concentrated partial discharge point positions and the harmful discharge information, so that the running state of the cable cam be evaluated more completely and accurately.

Description

technical field [0001] The invention relates to the field of cable quality evaluation, in particular to a method and system for evaluating the operating state of a cable. Background technique [0002] At present, the cable insulation diagnosis technology applied by power supply enterprises can be roughly divided into the diagnosis technology based on non-electrical quantity and the diagnosis technology based on electrical quantity. [0003] For power cables with fully insulated structures, diagnostic techniques based on non-electrical quantities mainly include infrared temperature measurement methods and optical fiber temperature measurement methods. The infrared temperature measurement method mainly uses an infrared thermal imager to observe the temperature distribution of the terminal joints and intermediate joints of the cable line under heavy load conditions, and judges whether the cable line is overloaded or whether there is a local overload at the cable joint under nor...

AI Technical Summary

Problems solved by technology

These methods all have the problem of not being able to completely and accurately evaluate the operating status of the cable

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