Research on Temperature Rise Characteristics and Resistance Changes of Typical Contact Fittings

Transmission lines are an important part of the electrical power system, and accidents such as disconnection and power outages often occur due to poor environmental conditions during operation. Overheating of fittings is one of the most common accidents in transmission lines. In order to solve this problem, the temperature rise and heat cycle tests of the tension clamps and mid span tension joints were conducted, the temperature rise characteristics of the tension clamps and mid span tension joints were analyzed according to the test results, and the relationship between resistance change of the tension clamps and mid span tension joints with the number of heat cycles was studied. The results show that the temperature of the tension clamps and mid span tension joints is lower than that of the conductors, and the temperature of the tension clamps is slightly lower than that of mid span tension joints. The resistance of the tension clamps and mid span tension joints is less than that of the conductors, and the resistance of the mid span tension joints under the same conditions is slightly less than that of the tension clamps, but the difference is not large. With the increase in the number of cycles, the resistance of the tension clamps and mid span tension joints both gradually increases.