With
two generators connected in parallel, adjustments can be made for one generator
to deliver all or any part of the load. If the resistance of the field rheostat
of a generator is lowered, the resulting increase in field current will cause
the generated voltage to increase. This increase in generated voltage causes
the load delivered by the generator to increase. Naturally if one generator
takes more load, the other generator drops some load. Hence by adjusting the
field rheostats of the generators, the load can be shifted from one generator
to the other or divided in any proportion desired.
How can the problem be remedied : No residual magnetism, reversed field connection and high resistance of field circuit are responsible for the failure of build up process of a dc generator. The factors are explained below: No residual magnetism: For the starting build up process requires some residual magnetism in the magnetic circuit then no voltage will be generated that can produce current flow through field circuit. Reversed field connection: The voltage induced inside the coil of field circuit due to residual magnetism that can permit the flow of current. For the following direction of this flux will be created and the direction of this flux will be same direction as the residual flux. If the field connections are reversed the lines of flux produced by current flow will oppose the residual flux, as a result generate voltage will decrease rather than increase. So voltage build up process failed. Field circuit resistance too high: A field
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