GE IS200RAPAG1BCA Channel isolation card

A generator set operating in the isochronous mode will operate at the same set frequency regardless of the load it is supplying, up to the full load capability of the generator set (see Figure 4-8). This mode can be used on one generator set running by itself in an isolated system. The isochronous mode can also be used on a generator set connected in parallel with other generator sets. If two generator sets operating in the isochronous mode without load sharing controls are tied together to the same load, one of the units will try to carry the entire load and the other will shed all of its load. In order to share load with other units, some additional means must be used to keep each generator set from either trying to take all the load or from motoring.

Load Sharing on an Isolated Bus 

Droop/isochronous load sharing combines the first two modes. All generator sets in the system, except one, are operated in the droop mode. The one unit not in droop is operated in the isochronous mode. It is known as the swing machine. In this mode, the droop machines will run at the frequency of the isochronous unit. The droop and speed settings of each droop unit are adjusted so that each generates a fixed amount of power (see Figure 4-9).

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