Transformer-analogue network analysers

The paper deals with the use of voltage transformers as multipliers for complex quantities and describes how they may be used to form a network analyser. The analyser consists of a measuring section and a number of identical panels each containing two multiplying units. These panels may be used to represent impedances, admittances, voltage or current sources, phase-shifting auto-transformers or mutual inductances. Valuable features of the analyser are the ease with which negative resistance and unilateral mutual inductance may be introduced. The accuracy of the analyser depends on the suppression of amplitude and phase errors in the voltage ratios of the transformers, and each transformer is supplied with the required exciting current from special compensators. The paper concludes with examples of the principles to be adopted in applying the analyser to common problems concerning the behaviour of power networks, electrical machines and closed-loop control systems as well as to the solution of linear simultaneous equations.