Heating in transformer cores due to radial leakage flux. Part 2: Computed results

The experimental loss and flux-density distributions, given in the companion paper for two full-scale transformer core-leg models, are compared with theoretical results obtained by computer. The computer program provides a 3-dimensional solution of the leakage flux distribution, both outside and inside the core. The flux penetration into the core leg is calculated using an anisotropic-core model, which gives the loss distribution due to the currents induced in the laminations. The predicted and measured flux-density distributions are in good agreement. Predicted loss distributions are consistent with those obtained from rates of rise of temperature, but measurement difficulties limit the accuracy of the comparison.