Hi everyone Books mention the Open Circuit and Short Circuit tests on a synchronous generator in order to determine its synchronous impedance. One observes that the Short Circuit Characteristic (plot of short circuit armature current versus field current) is a straight line all the way, whereas the Open Circuit Characteristic (plot of open circuit terminal voltage versus field current) droops due to magnetic saturation. My question is: why does the Short Circuit Characteristic (SCC) not exhibit saturation? I would be grateful if someone could offer a detailed explanation. I suspect this is due to armature reaction, but I am not very clear about this. Thanks in advance. Cheers Vivek.