Progress in Impulse Testing of Transformers

Impulse testing of transformers has resulted in improvement of design and manufacturing methods. Not only should the test methods now given in American Standard C57.2 be simplified to effect a reduction in cost of tests, but the test code should be modified to give an adequate assurance of failure detection. The importance of failure detection and means available at present are discussed at length. A new method is proposed which is more sensitive than the older methods and appears to be less subject to individual interpretation.