Computed Parameters - Dranetz Energy Platform User Manual

Computed Parameters

Single Channel
Parameters
True Average
Power
Apparent Power Unsigned value calculated using the product of the rms values of the voltage and
Fundamental
Apparent Power
Fundamental
Power
Volt Ampere
Reactive
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The computations below apply to single channel parameters.
Note that 0 = Phase Angle of Voltage, while 0
V
Average of the instantaneous power samples taken as the product of voltage and current
samples. Includes sign to indicate direction of power flow: positive (+) from source to
load, negative (-) from load to source.
N
1 ∑
WATT V I
=
n n
N
n =
1
where N = number of samples
Vn = Voltage at sample n
In = Current at sample n
current.
VA = V I
I I I I
= + +
ABC A B C
RMS RMS
Unsigned value calculated using the product of the fundamental rms values of the
voltage and current.
VA V I
=
fund fund fund
Signed value calculated using the product of the fundamental apparent power and the
cosine of the phase angle between the fundamental frequency components of voltage
with respect to current (0 = 0
WATT VA θ
=
cos
fund fund
Signed value calculated using the product of the fundamental apparent power and the
sine of the phase angle between the fundamental frequency components of voltage with
respect to current (0 = 0
V
VAR VA θ
=
sin
fund fund
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APPENDIX B/ Technical Specifications
= Phase Angle of Current.
I
- 0
).
V I
- 0
).
I
Continued on next page
B-5
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