In order to handle the shortcomings of identification for crimping defects on traditional cable joints, such as poor temperature sensitivity, numerous environmental factors, and low instrumentation detection accuracy, a cable joint defect identification method based on temperature gradient vector analysis is proposed. By carrying out multi-physical coupling calculations on a 10 kV three-core cable, the temperature gradient field and heat flux distribution vector map of the cable joint were obtained using the vector analysis method, forming the temperature gradient field distribution law of the cable joint. The results show that the surface temperature gradient of the joint is mainly affected by the temperature gradient in the x direction (i.e., radial direction of the cable); the numerical variability rate of surface temperature on nor-mal joint is not more than 16.6％, while the surface temperature gradient varies up to 49.8％; the numerical variability rate of surface temperature on defective joint is not more than 21.8％, while the surface temperature gradient varies up to 57.8％. Temperature gradient field has higher detection sensitivity than temperature field. The temperature gradient vector analysis of cable joints is of a positive significance for improving the operation and maintenance efficiency of heat-causing defects of cable joints.
关键词
电缆中间接头/矢量分析/温度梯度/热流密度/运维效率
Key words
cable intermediate joint/vector analysis/temperature gradient/heat flux density/operation and maintenance efficiency
维普
万方数据