Theoretical and statistical dependence of the transformer test regime on the stress-life characteristics of insulation systems

This paper reviews the proposal submitted by the IEEE Working Group for the Revisions of Dielectric Test Standards for Power Transformers and the technical aspects of stress-time endurance (life), particularly its rate as affected by field divergence, gassing stress, and discharge inception and extinction levels. A comparison of the effects of test stresses on insulation endurance is made, accompanied by a recommendation regarding future proposals for changes in test procedures.