Crosslinked polyethylene cable damp degree evaluation method based on water content and insulation parameter detection

Abstract

The invention relates to a crosslinked polyethylene cable damp degree evaluation method based on water content and insulation parameter detection. The evaluation method comprises a power cable different defect type manufacturing method, a power cable damp processing method, a power cable damp insulation parameter detection method and a power damp cable water content detection method. Cable samplesare manufactured according to different defect types of power cables. A long-term degradation test is carried out on the cable through a power cable damp treatment method; after taking out after a period of time, insulation parameters and water content data like the insulation resistance, the dielectric loss, and the voltage withstanding level of the power cables with different damp degrees can be detected by using a power cable damp insulation parameter detection method and a power damp cable water content detection method. Through comparison, the relationship between the cable insulation parameters and the water content under different damp degrees can be obtained. According to the method provided by the embodiment of the invention, after usage of the study method of the damp degree ofthe crosslinked polyethylene cable based on water content and insulation parameter detection, the damp degree of an unknown cable can be accurately evaluated by measuring the insulation parameters ofthe cable according to the relationship between the insulation parameters of the cable and the water content.

Description

technical field [0001] The invention relates to the field of power cable equipment in a power system, in particular to a method for evaluating the moisture content of a cross-linked polyethylene cable based on water content and insulation parameter detection. Background technique [0002] Compared with overhead lines, power cables are laid underground, have more insulation layers, and their state is less observable. Internal hidden dangers left by improper product quality and installation processes are difficult to be discovered and checked in time, that is, they have the characteristics of "latency". When these hidden dangers accumulate and develop to a certain extent, they will quickly lead to cable failure. The main symptom is breakdown. In special cases, it will also cause combustion and explosion, especially where the cable accessories are located. Judging from the consequences of potential hidden dangers of cables, the most extensive impact is cable water ingress. Cab...

AI Technical Summary

Problems solved by technology

Cables with latent hidden dangers, under the excitation of partial discharge or overvoltage, are easy to rapidly develop into defects and expand to cause faults, and faults often occur repeatedly on the same line, causing most cables to fail to meet their design requirements. service life

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