# IEEE Guide for Aircraft Electric Systems

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22), when nr > ns the developed mechanical power becomes negative. In other words, when nr > ns the asynchronous machine begins to consume mechanical power working as an electric power generator. In electromagnetic terms, for rotations above the synchronous, the relative speed between the rotating flux and the rotor itself changes sign for speeds below the synchronous. Therefore, the rotor voltage and current change direction (change sign) and, therefore, V1 and E1 do the same. 1,10,11 As s is negative in the generator, the secondary emf E2 is leading by 90° with respect to the magnetic field B (and opposed to the direction of the secondary voltage if it is a motor).

For this reason, it is common to use the transformer model to represent the induction generator. However, it should be observed that in spite of the fact that the magnetizing curves of both machines are similar in form, in the characteristic BxH (or ΦxNI or VxI ) of these machines, the slope and the saturation area of the mmf curve of the induction generator is much less accentuated than that of a good quality transformer. This is due to the air gap in the induction generator that reduces the coupling between the primary and secondary windings.

67 minutes (without wind). That means, it can steadily light four ordinary bulbs of 60 Watts, if the wind is not absent for more than 5 minutes. 1 Classify small power plants according to their power ranges and propose briefly two basic examples of applications for each. 9, calculate the volume of reservoir water required to allow 30 minutes of steady energy without wind. 3 Why are micropower plants so different from larger ones? In what cases are they recommended? 4 Discuss which of the conventional alternative sources of energy is more suitable for use with induction generators to provide a steady supply of energy with minimum equipment.