New Temperature Factor of Power Quality, Especially for Marine Technology Applications

Marine induction machines are exposed to different disturbances appearing simultaneously in a ship power system: frequency and voltage rms value deviations, unbalance and voltage waveform distortions. As a result, their windings temperature-rise may reach extremely high level, even if the voltage parameters fulfill the requirements of ship classification societies. Effective protection of marine induction machines against overheating requires an appropriate method of power quality assessment. This paper proposes a new power quality factor that value is proportional to the windings temperature of induction machines supplied with voltage of lowered quality.