Derating of induction motors due to power quality issues considering the motor efficiency class
- Donolo, Pablo Daniel
- Pezzani, Carlos Martín
- Bossio, Guillermo Rubén
- de Angelo, Cristian Hernan
- Donolo, Marcos A.
DOIAbstract
Heating and losses of induction motor (IM) grow with the supply voltage unbalance and harmonic distortion. To avoid thermal overload, the IEEE 141-1993, the IEEE 3004.8, NEMA MG1-2014, and the IEC 60034-26 standards establish derating factors for IMs operating under those conditions. In this article, we show that while the derating factors proposed by these standards adequately protect standard-efficiency IMs, they are only marginally adequate to protect modern higher-efficiency IMs. To this end, we compare the derating factors provided by the standards with the derating factors required to maintain the losses at rated values in a standard-efficiency IM, in a premium-efficiency IM, and in a super-premium-efficiency IM. To extrapolate the re...
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