Transient voltage distribution and interturn voltages in a synchronous generator during the commutation of a thyristor bridge load

This paper presents the distribution along a synchronous generator winding of the leading edge of a notch in the voltage waveform of a synchronous generator supplying a thyristor bridge. The leading edge of the notch is steep enough to cause a non-linear distribution along the generator winding during the transient period. This non-linear distribution results in higher interturn voltage than that in a normal operation. The presence of a cable connected between the bridge and the generator as well as the variation of the firing delay angle of the bridge cause a modification of the transient notch depth and then affects the distribution of the notch leading edge along the winding.