Study on the Temperature Rise Characteristic of Vegetable Insulated Oil Transformer under Different Loads Conditions

In this paper, the heat conduction and heat dissipation mechanism of transformer are analyzed by finite element method based on thermodynamics and fluid mechanics theory to study the temperature rise characteristics of vegetable oil insulated transformer in practical operation. A two-dimensional simplified model of insulated transformer was established. The finite element method was used to solve the temperature field of the model under the load change, and the temperature field distribution of the vegetable insulated oil transformer in stable load was obtained. Compared with the mineral insulated oil transformer, it is found that when the load factor K is less than 1.5, the temperature rise characteristic of the mineral insulated oil transformer are better than that of the vegetable insulated oil transformer, and when the load factor K is not less than 1.5, the temperature rise characteristic of the vegetable insulated oil transformer are better than that of mineral insulated oil transformer. Moreover, the temperature field distribution of the vegetable oil insulated transformer was calculated based on the given dynamic load curve. Compared with the mineral insulated oil transformer, we can find that the temperature rise characteristics of the vegetable insulated oil transformer are better than that of the mineral insulated oil transformer when the load is low. However, when the load is high, the opposite is true.