Constant-current regulating transformer characteristics

E. D. Treanor: The authors´ criticism of the conventional method of stating the characteristics of constant-current transformers is possibly justified in that this method was indefinite and allowed the possibility of misinterpretation by the purchaser and of neglect by the manufacturer. The assumption that the losses remain essentially constant at all loads was of course known to be not strictly accurate, but the method was of long standing and thought to be satisfactory for transformers which were usually operated near full load or on taps which approximate full-load conditions. It was a convenient assumption because it simplified and reduced the costs of tests and gave accurate results at the point of usual loading.