Abstract

The cross-linked polyethylene (XLPE) cable accessories are important component parts in the power systems, which play a crucial rule in the electrical systems for supplying high quality power. It is necessary to carry out monitoring and diagnosis of accessories for enhancing reliability of power systems. This paper applied COMSOL software to establish the simulation model of 110 kV XLPE cable joint to investigate the relationship between the characteristics of magnetic field distribution and cable joint defects. Two typical defects of metal sheath damage and insulation scratch were simulated, considering the variation parameters of the location and degree of the two defects. The related indicator of magnetic field characteristics were extracted to evaluate the joint degradation. The peak value of magnetic field strength increases when the damage degree of metal sheath gets severer. Moreover, the range and extent of the enhancement of the magnetic field intensity are both proportional to the distance from the damage to the stress cone. While the magnetic field distribution varies more slightly as the degree of insulation scratch changes. The result reveals that the magnetic field enhancement can be detected by a magnetic sensor when the defects exist in the cable joint, which can provide a new monitoring method of XLPE cable to ensure the safe and reliable operation of power cable system.

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