info:eu-repo/semantics/article
Derating of induction motors due to power quality issues considering the motor efficiency class
Fecha
2020-03Registro en:
Donolo, Pablo Daniel; Pezzani, Carlos Martín; Bossio, Guillermo Rubén; de Angelo, Cristian Hernan; Donolo, Marcos A.; Derating of induction motors due to power quality issues considering the motor efficiency class; Institute of Electrical and Electronics Engineers; Ieee Transactions on Industry Applications; 56; 2; 3-2020; 961-969
0093-9994
CONICET Digital
CONICET
Autor
Donolo, Pablo Daniel
Pezzani, Carlos Martín
Bossio, Guillermo Rubén
de Angelo, Cristian Hernan
Donolo, Marcos A.
Resumen
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 results from these IM, we compared the nameplate data of 548 IMs of different efficiency classes and found that higher efficiency classes correlate to higher IM starting currents and lower impedances to the negative sequence and harmonic voltages. These lower impedances in turn may lead to higher losses for unbalanced and harmonic voltages conditions.