While it may be common for a facility to install a single large generator to meet its power needs, paralleling two or more generators offers a number of practical benefits and advantages over a single-generator system.
The generators provide power in the event of a loss of utility service. Power transfer can take place at the transfer switch or by using the breakers in the switchgear.
The figure shows a typical ATS-Based emergency/standby power system. The generator power is combined onto the paralleling bus. Power flows through the feeder breakers in the paralleling switchgear to the emergency connection of the ATS.
The figure shows a typical single-utility system in which the entire facility is placed on generator power.
During a power outage, the utility main breaker opens; after a user-selected number of generators are online, the generator main breaker closes. The return to utility power can be open, closed or soft. Because the generator main breaker separates the load bus from the generator bus, the generators can be paralleled in test mode without affecting the load.
The figure shows a typical dual-utility system in linear configuration. If there is a loss of only one of the utility feeds, the system can be programmed to place that side on generator power, transfer all the loads to the remaining good utility or transfer the entire system to generator power. When the utility returns, the transfer back to utility can be open, closed or soft.
If the system is on generator power because both utilities fail and only one utility returns, the system can be programmed to return that side to utility power, return all loads to the one good utility or wait until both utilities return before automatically returning to utility power.
The figure shows a typical dual-utility system in which the utility bus and generator bus are separate lineups. The available sequence of operations is similar to the linear dual-utility system.
The advantage of the ring dual-utility configuration over the linear configuration are:
The figure shows a typical generator based prime power system in which the entire facility is placed on generator power. The integrated power management feature optimizes the number of online generators based on the load’s kW demand, starting and stopping generators as required.
Generators are sequenced on in order of operator-assigned priority (or based on runtime) and taken off in reverse priority.
Operator-defined set points determine the percent load level and time delay at which the genset will be brought on or taken offline.
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