Impulse voltage distribution and transfer in barrel-type distribution transformers

A barrel-type distribution transformer is modelled by an electrical network and methods of calculating the values of the network elements are discussed. The response of the network to standard and chopped impulse waves is evaluated through the use of the electromagnetics transients program (EMTP) with comparison of experimental and computed results included. The phenomenon of surge transfer is also considered by application of the EMTP to the detailed models of two different designs of the same transformer. A method of simplifying the electrical network is also discussed.