A Novel Approach for Detection and Protection of Fault Excitation in Synchronous Machines

One of the conditions that synchronous motors and generators in workshop environments may face during their operation is the phenomenon of excitation circuit interruption. This phenomenon occurs when the excitation source of the generator field coil is cut off from the DC power source or short circuited. This may be due to factors such as accidental disconnection of the key of the excitation system, opening of the excitation circuit, short circuit in the excitation sliding rings, voltage regulation system fault, and loss of the power source of the excitation system. this paper proposes a novel approach for real time identification of excitation fault using synchronous machine signal which can be measured in its terminal. also, the proposed method can distinct the excitation fault from the swing phenomena which is neglected in previous researches. Therefore, in this article, the simulation and protection solution of this phenomenon in synchronous machines is discussed.