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Behavior of induction motor due to voltage sags and short interruptions

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4 Author(s)
Gomez, J.C. ; Electr. Power Syst. Protection Inst., Rio Cuarto Nat. Univ., Cordoba, Argentina ; Morcos, M.M. ; Reineri, C.A. ; Campetelli, G.N.

An experimental study and some calculations on induction motor behavior were carried out. The effects due to short interruptions and voltage sags were investigated. A standard three-phase squirrel-cage motor of 5.5 kW, 1500 r/min, and 380 V was used. The presence of induction motor changes the voltage sag waveform and duration. Protection characteristic curves and contactor ride-through capability together with their improvement are also studied. The interaction between motor load, system hot-load pickup, and voltage sag magnitude determine the motor re-acceleration duration and magnitudes. Besides, on-sag and post-sag currents can reach levels higher than the direct start values. Post-sag overcurrent duration can last more than twice the normal start time period, having specific energies in the same order of magnitude

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Power Delivery, IEEE Transactions on  (Volume:17 ,  Issue: 2 )