Transient voltages in rotating machines

The unequal distribution of voltage in rotating machine multiturn coils caused by switching transients, and means for alleviating the stresses occasioned by these transients, are discussed in this paper. A brief description also is given of field measurements of switching transients and of tests to determine the effectiveness of capacitors as a protection against switching transients. It is shown that capacitors connected between each phase and ground near the machine terminals gives effective protection.