Computed Parameters - Dranetz DBPGFLEX3KPKG User Manual

Computed Parameters

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