A radial damage simulation and test method under the influence of abnormal hot spot of cable

Abstract

The invention discloses a method for simulating the radial damage of a cable under the influence of the abnormal heat spots of the cable. A left lateral movement track and a right lateral movement track are arranged in the thermal insulation housing of a simulation device; a first supporting assembly comprises a left supporting column and a right supporting column which are erected on the left lateral movement track and the right lateral movement track; the left supporting column and the right supporting column are connected with a longitudinal movement track; the longitudinal movement track is sleeved with a U-shaped clamp; the U-shaped clamp comprises a U-shaped clamping head; the U-shaped clamping head is provided with a temperature sensor and a heating assembly; and a second supportingassembly is of the same structure with the first supporting assembly. The evaluation method includes the following steps that: the reference discharge amplitude distribution spectrum of a fault-freecable and the evaluation discharge amplitude distribution spectrum of an evaluation cable are obtained through testing; Weibull distribution spectrum conversion is performed; a distribution spectrum maximum likelihood curve is fitted; the maximum offset of the curve is calculated; and analysis and determination are performed. With the simulation device adopted, the fault simulation of the different radial damage of the cable under the influence of the abnormal heat spots can be effectively realized, and the evaluation method can accurately judge the degree of the radial damage of the cable.

Description

technical field [0001] The invention belongs to the technical field of cable fault diagnosis, in particular to a radial damage simulation and testing method under the influence of abnormal hot spots of cables. Background technique [0002] Ethylene-propylene rubber-type train cables have the advantages of high dielectric properties, high-temperature and low-temperature resistance, and are currently the most widely used cable types. The safety of the train system is of great significance. In actual operation, cables need to adapt to various special wiring requirements of the car body, and there are inevitably bending situations. In addition, due to the gradual increase in complex lines and the continuous increase in operating speed, radial damage to the cable insulation occurs, resulting in insulation layer damage. The generation of radial cracks and abnormal hot spots seriously reduces the operation reliability of the cable. [0003] The partial discharge detection method ...

AI Technical Summary

Problems solved by technology

However, in the factory test and routine inspection of high-speed train cables, the natural state, that is, cables without bending and abnormal hot spots are usually tested, and the detection parameters are only based on partial discharge. Damage simulation and detection are difficult

In addition, the existing cable torsion test device mainly tests the bending resistance of the cable in the axial direction. The test results can only reflect the performance of the material itself, and it is difficult to reflect the radial damage of the cable in the actual operation. , and there is no possibility of further analysis of the field conditions

Generally speaking, there is currently a lack of simulation devices and corresponding evaluation methods for radial damage to EMU cables. Therefore, research on the simulation devices and evaluation methods has great engineering value and importance for the safe and effective operation and maintenance of EMU cables in the future. Theoretical significance

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