AtlasPC Digital Control, Vol. I
Manual 85586V1
90
Woodward
Power Calculations
Individual and total watts, VARs, VA, and power factor inputs. A negative phase
sequence voltage input and a THD voltage input are also provided.
All power calculations implement algorithms in accordance with IEEE 1459-2000.
The power inputs have adjustable software filters. All power inputs are updated
every 3 cycles. With an input of 60 Hz, this equates to 50 ms.
The hardware does not require three phases for load calculations, the application
can configure the module for single phase, and all functionality will be modified
accordingly. The single phase input that must be provided is the A phase. The
application can also configure the module for a “Y” or “delta” line configuration,
and the calculations will compensate appropriately. If the physical connections
are to a wye connected generator or load, the input to PowerSense should also
be wye connected (line-to-neutral). If the physical connections are to a Delta
connected generator or load (no neutral present), the input to PowerSense
should also be Delta connected (line-to-line). The “Y” or “delta” configuration
applies to the entire set of PT and CTs, it is not possible to configure the PTs for
“Y”, and the CTs for “delta”, or vice versa.
Summary of Contents for AtlasPC
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