Digital simulation of a group of induction motors

The calculation of the transient currents, voltages, torques and speeds of a group of induction motors supplied from a common transformer, following switching operations or faults, is considered. The differential equations describing the system are numerically integrated, accounting for any discrete changes in the currents caused by the switching operations. The digital computer program is capable of dealing with all the possible sequences of symmetrical switching and fault conditions in a group of up to 10 motors and it incorporates the facility for automatically plotting the main results on an incremental graph plotter. The paper indicates the theoretical approach and describes the computer program.