Hot Spot Temperature Inversion Sensing Method of Cable Connector

The power system is one of the key national infrastructures. In the complex power system, the three-core cable, as a common transmission and distribution mode, is widely used in cities, industrial areas and remote energy transmission due to its advantages of compact structure and high power supply reliability. The overheating of the three-core cable will seriously affect the insulation life of the cable, and reduce the stability of the distribution network. The cable joint is the weak link of the three-core cable line, and the contact resistance makes the joint more heated compared to the body at present, and it is difficult to directly measure the temperature inside the three-core cable joint. Therefore, it is of great significance to study the temperature rise of the three-core cable joint and propose a method that can reverse the internal temperature of the joint in real time, which is to conduct real-time monitoring for the stable operation of the three-core cable line.