Overloading of power transformers

The A.I.E.E. transformer subcommittee^∗ has planned an extension of the scope of the Institute publication relating to the operation of transformers to include recommendations for the short-time overloading of oil-immersed transformers in service. These recommendations take advantage of the heat storage capacities of the materials of the transformer to supplement present recommendations relating to the continuous overloading that is possible when the ambient temperature is lower than the standard ambient temperature. This report gives a brief review of the considerations upon which the proposed changes are based and includes the new material in the form in which the subcommittee has prepared it. It is submitted to the Institute for constructive criticism.