Reduce the hot-spot temperature of an oil transformer using a heat pipe

Transformers are one of the most significant and sensitive tools in the electrical grid. Their life and optimal operations are very imperative. The hot-spot temperature of this equipment plays a crucial role in the life of the transformer. Increasing hot spot temperature reduces the oil quality and aging of the insulation, ultimately, the life of the transformer. There are several ways to reduce the hot-spot temperature. One of these techniques is the passive cooling system via heat pipe, which has played an effective role in reducing the hot-spot temperature. However, using heat pipes in the space inside the transformer causes problems, including disruption of its electrical performance. Therefore, in this research, the thermal effects of the heat pipe inside and outside the oil tank on the thermal performance of the transformer are investigated experimentally, and finally the obtained results are compared. The results showed that by installing the heat pipe outside the transformer on the radiators, the temperature reduction of the hot spot reached 12 degrees Celsius, which reduces the corresponding aging rate to 0.17.