Thermal Characteristics of 10 kV Cable Joints Under Defects in the Crimping Process

In order to study the impact of crimping defects caused by excessive contact resistance on the temperature distribution of cable joints, based on the contact resistance theory of equivalent conductivity, a multi-physical field coupling simulation model of 10 kV high-voltage cable joints with crimping defects was established using finite element software, and the variation of thermal stress characteristics under the condition of crimping defects in cable joints was studied. The results show that, taking k = 5 as an example, the temperature at the conductor junction of the cable joint with crimping defects is the highest, reaching 58.5 °C, which is 19.9% higher than without defects. As the contact coefficient k increases, the temperature of the connector increases, but the influence of the change in k on the cable core temperature at 2500 mm from the center of the connector can be ignored. The research results of this paper can provide theoretical support for monitoring heating faults caused by crimping defects in 10 kV cable joints.