In order to solve the problem of local overheating in the valve side bushing of converter transformer under the condition of heavy load

we theoretically and experimentally studied the key topics in the integrated technology of closed gravity heat pipe and converter valve side bushing

such as heat transfer capacity

type of working fluid

filling rate and inclination angle

etc. Firstly

the theoretical analysis shows that the heat transfer capacity of the integrated technology can meet the actual working needs of the bushing

and the heat transfer inside the bushing is less than 7% of the heat transfer limit value. Secondly

the results of heating belt simulated conductor heating show that the medium inside the current-carrying conductor strengthens its own heat transfer process. When the working temperature of the working fluid matches the working temperature of the valve side bushing of converter transformer

the uniformity of the steady-state temperature distribution of the current-carrying conductor is the best. There are great differences in the optimum liquid filling capacity corresponding to different working fluid types

but it is directly related to the location of the highest temperature zone of the current-carrying duct without working fluids. The inclination angle has some adverse effects on the steady-state temperature distribution of conductor

but it can meet the requirements of different installation angles of the converter valve side bushing basically. Finally

the results of conductor current-carrying heating experiments show that the uniformity of temperature distribution in current-carrying conductor is significantly improved by the integrated technology

in which the peak temperature decreases from 108.1 ℃ to 84.6 ℃

and the maximum temperature difference decreases from 47 ℃ to 3.2 ℃. The research results in this paper can guide the design of integrated structure of valve side bushing of EHV/UHV converter and closed gravity heat pipe. At the same time

the conclusion also provides a new technical means for local overheating of power equipment such as circuit breaker.