Single-phase short-circuit torque of a synchronous machine

THE ANALYSIS of synchronous machines previously published by Doherty and Nickle is extended in this paper to include the calculation of torque due to single phase short circuits. The torque is expressed as the sum of odd and even harmonic series which are simply related to those previously derived for the armature current. The effect of amortisseur windings also is taken into account. As an illustration of the application of the equations, the short-circuit torque is calculated for a 100,000-kva. generator.