Temperature is one of the important parameters of power cables with normal operation. In this article, the electromagnetic and thermal characteristics of three-core cable joints were investigated. And the core and surface temperature gradient were obtained with a three-core cable joint. The research results show that the core temperature of the center is about higher than 14 °C than the body part. The surface temperature is distributed as high at the center and low at the body. The surface fluctuation amplitude of the joint center temperature is about 10 °C. The maximum surface temperature gradient with the center can reach 1697 °C/m of cable joint. The results here should have potential application value in characteristics of electromagnetic-thermal coupling field under the action of internal defects of cable joint.

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