The measurement of power in polyphase circuits

R. D. Evans: The proper method of making measurements on polyphase circuits has been the subject of considerable discussion within the last few years. With balanced circuits, the methods were rather generally accepted, but this was not the case with unbalanced circuits. It is recognized that if the definitions and methods of measurement for polyphase circuits were to have any assured standing, they should cover the unbalanced circuit. Unbalanced polyphase circuits were not well understood, and consequently there has been a lag in the development of corresponding measuring systems.