Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

circle diagram
(1) graphical representation of the operation of an induction machine. It is based on the approximate equivalent circuit and expresses stator and rotor current relations for all operating modes (motor, braking, generator) and all values of slip. Several variations of the diagram exist.
(2) graphical representation of the power flow through a transmission line. The maximum power flow through the line can be determined by the impedance of the line.