Interturn voltages in machine windings evaluated from on-site test results and computer simulation

Interturn voltages produced in the line-end coils of machine windings when steep-fronted prestriking transients reach the winding are usually predicted by injecting a simple ramp-function voltage wave into a computer simulation of the winding. In practice, steep-fronted prestriking transients have complex waveforms, and it is possible that a simple ramp function does not adequately represent such a wave. The authors examine this uncertainty and also the possibility that the complex waveforms of prestriking transients may cause voltage resonance in line-end coils, and the production of interturn voltages greater than predicted with simple ramp functions