Transients in induction machines with terminal capacitors

In order to study the influence of terminal capacitors on the transient behaviour of an induction machine, differential equations are developed in which the nonlinear effect of magnetic saturation is taken into account. Theoretical results obtained from a digital-computer solution of these equations are compared with experimental measurements on a 7.5hp motor. The transients investigated are those (a) following disconnection and reconnection to the supply with power-factor-correcting capacitors; (b) following disconnection and reconnection to the supply of the machine operated as a capacitor-excited induction generator; (c) during capacitor and magnetic braking of the motor.