GE Industrial Solutions Zenith - Energy Commander Paralleling Switchgear (PSG) - Manual (Page 7)

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Noon
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ON OFF
Utility
Purchased Power
Generator
Non-Purchased Power
kW Demand Threshold
Time
kW
> Peak Shave Example
A “Peak Shaving” application is sometimes used to transfer non-critical
loads onto generators during peak utility demand hours.
System Applications
Utility
Generator Generator
Feeders
Energy Commander
Utility Parallel System
> Con
figuration Example
Parallel with Utility application
Parallel with Utility
> Features
Parallel with utility systems are utilized whenever
generators are to be actively synchronized and
paralleled with utility sources for short or long
durations.
These systems are often also used for standby
use as well.
PSG controls the generators transfer operations
with the utility source(s) as well as the power
management (loading controls) to direct power
the appropriate direction.
Transfers may occur in short duration (momentary
closed transition), a somewhat longer duration
(softload/unload closed transition), or a sustained
duration (maintained parallel with utility).
Power management in maintained parallel situations
includes controlling import levels from utility, export
levels to utility, or base load levels where generators
are loaded to set amount disregarding the import
and export contribution from utility.
> Components
System combines generators with utility sources.
GE ’s Zenith Energy Commander system controls
load feeder breakers and utility import/export
parallel loading.