Higher cable core temperature will accelerate the aging of cable insulation and hence lower the insulation grade. To develop an effective method for monitoring the measurement of cable core

a temperature calculation method of cable core is put forward in this paper based on temperature of cable insulation layer and operating current. According to the structure of 10 kV mining cable

a calculation model of cable core temperature is derived

and an experiment scheme of dynamic temperature of cable core is designed. The temperatures of insulation layer and core of the cable without sheath are measured by a thermal infrared imager

and the temperature of the cable core is calculated with the thermal circuit model. The results show that the error between the calculated and the measured values of cable core temperature is less than 5%

and the proposed temperature monitoring method of cable core meets the real-time requirement.