A method for simulating and testing the faults of different degradations of the insulating layer of ethylene-propylene rubber cable terminals

Abstract

The invention discloses a simulation method for different degradation faults of an ethylene-propylene rubber cable terminal insulation layer. A detachable fault simulation end of a fault simulator includes a first metal layer, a first semi-conductive layer, an ethylene-propylene rubber insulating layer and a second semi-conductive layer which are concentrically formed from the inside to the outside. The degradation processing method comprises performing degradation processing of different temperatures and times on the faulty insulation end. The fault evaluation method comprises the steps of obtaining a reference spectrum curve, testing the spectrum curve, calculating an aging loss factor, and performing analysis and determination. The simulation method for different degradation faults of an ethylene-propylene rubber cable terminal insulation layer has the beneficial effects that the fault simulator can simulate an aging fault of the ethylene-propylene rubber cable terminal insulation,and adjust the degree of the terminal insulation aging fault by replacing the faulty simulation end to realize multi-dimensional simulation; and the evaluation method can classify the terminal fault degrees to achieve multi-dimensional, comprehensive and accurate evaluation for the terminal state of insulation.

Description

technical field [0001] The invention relates to the technical field of cable terminal fault evaluation, in particular to a method for simulating and testing faults of different degradations of the insulating layer of an ethylene-propylene rubber cable terminal. Background technique [0002] Due to its strong bendability, high low temperature resistance and dielectric properties, ethylene-propylene rubber cables play an irreplaceable and important role in the power supply system of high-speed trains. Propylene rubber cables have broad application prospects in future railway systems. As an important part of the connection between the cable and electrical equipment such as the pantograph or vehicle transformer, the cable terminal is the weakest part of the cable in terms of insulation capacity, and its special design structure will cause serious distortion of the internal electric field of the terminal, resulting in serious heating of the cable terminal , coupled with the comp...

AI Technical Summary

Problems solved by technology

However, most of the existing research on aging fault simulation is for ethylene-propylene rubber block materials, which cannot truly reflect the influence of the special structure of the cable terminal on the detection method; at the same time, the power frequency dielectric loss value or insulation resistance method is usually used to analyze The insulation performance of the cable terminal is judged, the probability of misjudgment is high, and the aging state of the insulation cannot be sensitively reflected, making the evaluation result inaccurate

Images