Impulse testing of commercial transformers

The transformer subcommittee of the A.I.E.E. electrical machinery committee presents herewith a progress report covering its work to date on the impulse voltage testing of commercial electric power transformers. A tentative test procedure has been agreed upon, although complete agreement has not yet been reached on all details. It is hoped that this report will stimulate among members of the Institute discussion that will be helpful to the committee in completing a formal test code during the coming year.