Machine Parts

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.

Assume that two generators and a load are connected parallely. Let us assume that generator 1 is operating and supplying current to the load. The polarity of the voltage at terminals of the generator is indicated in the diagram. The load of generator 1 now increases to the point where the rated current is exceeded. The second generator must be placed in operation to share the load. The prime mover of the second generator started and voltage builds up in generator 2. Before anything else is done after the voltage of generator 2 is build up. The polarity of generator 2 should be compared with the running generator 1. Since both of   these generators are to be connected in parallel. The positive terminal of each generator is to be connected together and the negative terminals of two generators are connected together. If the generators are not properly connected as just indicated, the improper connection will place both generators in series, with only the internal resistance of