A method for simulating and testing radial local moisture damage of cables

Abstract

The invention discloses a cable radial local moisture-induced damage simulation method. The bottom of the interior of the isolation box of a simulation device is provided with a left transverse sliding bar and a right transverse sliding bar; a first supporting assembly includes a left supporting column and a right supporting column; the left supporting column and the right supporting column are respectively connected with the left end and right end of a longitudinal sliding bar; the longitudinal sliding bar is sleeved with a U-shaped clamp through a lifting device; the U-shaped clamp includesa transverse or longitudinal U-shaped clamping head for clamping a cable; and the U-shaped clamping head is provided with wedge-shaped hollow needle assemblies. The detection method includes the following steps that: a reference discharge frequency distribution spectrum and a test discharge frequency distribution spectrum are obtained; a spectrum mathematical model is obtained through fitting; theintegral difference of the fitted frequency curve mathematical model is calculated; and the maximum offset of a damage curve is calculated. With the simulation device adopted, the simulation of different radial damages can be realized. According to the detection method, the damage condition of a test cable can be accurately judged through comparing model difference between a reference frequency curve and a test frequency curve, and on the basis of the test information of the test frequency curve itself.

Description

technical field [0001] The invention belongs to the field of electrical system cable faults, and in particular relates to a method for simulating and testing cable radial partial moisture damage. Background technique [0002] In recent years, with the rapid development of electrified railways, the operation of bullet trains plays an increasingly important role in daily travel, and bullet train cables play an important role in the transmission of electric energy, so the safe operation of bullet train cables is directly related to the normal operation of transportation . In the actual operation process, due to the structure of the train and the characteristics of the running line, the cables of the train are often bent and twisted to varying degrees, and at the bends, the various performances of the cables are degraded, and they are more susceptible to moisture intrusion. Increase, the moisture will spread to the surrounding at the invasion point, resulting in radial local mo...

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Problems solved by technology

[0003] As we all know, radial bending often occurs in the actual operation of motor vehicle cables, but the moisture intrusion at the radial bending place is relatively random, so it is often difficult to obtain different degrees of radial local moisture damage to the cable; and currently for cable fault conditions Generally, the partial discharge detection method is used, but there is no clear method to detect the radial local moisture of the motor vehicle cable, so in order to study the radial local moisture damage of the motor vehicle cable, a more convenient, fast and controllable method is urgently needed to simulate different cables. The degree of radial local moisture damage, and the damage detection of the test cable on the basis of the radial local moisture damage simulation has great engineering value and theoretical significance for the safe and effective operation and maintenance of future bullet train cables

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