Abstract
It is of great significance to monitor the thermal condition of three-core power cables in order to ensure the secure and stable operation of power system. Nevertheless, the power supply of thermal condition monitoring system terminal of three-core cables remains to be solved. A three-core power cables energy harvesting method was proposed by analyzing the magnetic field distribution around the three-core cable surface. Then a three-core cable energy harvesting and temperature measuring device was designed and produced. The three-core cable harvesting model was built by Ansys Maxwell, and the impact of different factors on the performance of energy harvesting was analyzed. The cable core temperature in steady state and transient state was calculated using finite element method based on the load current obtained by induced voltage of energy harvesting coils and the cable surface temperature measured by temperature measuring device. Results obtained by simulation were very close to the measured ones, which indicated the thermal condition monitoring system of three-core cables based on energy harvesting method was effective.
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