Principles of Heavy Current Engineering by A. M. Lund, P. G. Howatson

By A. M. Lund, P. G. Howatson

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To 'break synchronism' implies violently fluctuating currents which would soon open circuit-breakers and disconnect the alternator from the rest of the system. A c1earer understanding of these proeesses can be achieved by considering the alternator to be connected to a prime mover such as a steam turbine or diesel engine. f. of the alternator E and the voltage of the system V must be equal (see Fig. 34b). The circuit diagram shown in Fig. 34a contains an inductance X s. c. machines (Figs. 21) all contained resistance in series with the armature.

The winding will be closed on itself and Fig. 14 represents the winding as aseries of coils which is, up to a point, electrically correct. The purpose of the diagram is to explain how the required changes in direction of current flow are brought about. Because the coils are shown with the two sides adjacen tone will experience trouble if one uses Fig. 14 to sort out the direction of force or induced voltage . For these purposes, diagrams such as Fig. 16 will be necessary, in which the conductors comprising the coils are shown in their true relative positions.

To produce speeds below is not so easy to do economically. f. can be reduced in a number of ways but they often involve resistances carrying currents of the size found in the armature. f. and hence the speed are reduced, the energy that is no longer being converted into mechanical power is being 'bumt up' in a resistance and the efficiency falls directly with the speed. Fig. 21 shows relevant circuit arrangements. The most economical method is obviously to have some separate source of variable voltage, such as a separate motor generator set where the controller is now in the generator field so that any waste of power will be much less.

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