DC voltage divider is indispensable for DC power transmission system. Owing to its structure and principle

DC voltage divider has a great temperature gradient inside

which affect its error performance and increase the flashover probability of the hollow insulator. For the heat problem

this paper improves the structure of the ±1 100 kV DC voltage transformer’s internal temperature field

while improving the cooling structure of the top

this design can lower its temperature gradient. Finally

Ansys Fluent is used to simulation the new design for the analysis of the temperature distribution and heat flux field

the results show that

in the case of the primary current is 2 m A and the heat flow is 2.2 k W

the new DC voltage divider internal temperature decreases significantly compared to the conventional structure at an ambient temperature of 27 ℃

the temperature difference can reach 20 K. The cooling structure of the top increases the gas flow inside the divider and improves the efficiency of the heat dissipation

this optimized design can meet the cooling requirement.