Computation and testing of temperature distribution in 550kV OIP transformer bushing

High temperature can cause many problems in OIP transformer bushing, such as aging of insulation and partial discharge, which will obviously reduce the lifetime of bushing. This contribution calculates the total loss in bushing under both voltage and current loads using the finite elements method(FEM) and then obtains the temperature distribution though the finite volume method (FVM). Computation results indicates that the total loss in 550kV bushing is 1203.89W, among which the 4.5% is dielectric loss. The peak value of temperature rise reaches 76.27°C, which appears in the center pilot. Measurement of temperature rise is taken to check the calculation method, in which 16 points on the center pilot and nine points on the surface of umbrellas are taken into the comparison. Among the 25 compared points, error stays within 5% on 16 points, between 5% and 10% on 4 points, between 10% and 15% on three points. It can be concluded that the methods used in this contribution is proper and can support the designing and analyzing of OIP bushing.