Dranetz hdpq xplorer User Manual

F-3
APPENDIX F/ PQ Parameter Calculations
Calculations
(continued)
Description Abbreviation
Wiring Configuration
Formula
Units Precision
Volts RMS of
fundamental
Derived from DFT
Vfnd-a
Vfnd-b
Vfnd-c
Vfnd-d
Single phase
Split phase
Wye
V
pk
is calculated from
the 1
st
harmonic of
DFT
Volts +/- 0.2% of
Reading *
15 KHz BW
Vfnd-ab
Vfnd-bc
Vfnd-ca
Measured for Delta
Calculated for Wye
NEMA Unbalance
Max deviation of
the 3 phases from
the average of the
3.
Vunbal-a
Vunbal-b
Vunbal-c
Measured for Wye
V
x
is channel with
largest deviation from
average
V
avg
is average of the
three channels
%+/- 1 %
Vunbal-max
Vunbal-ab
Vunbal-bc
Vunbal-ca
Measured for Delta
Not Calculated for Wye
Symmetrical Components
Zero Sequence Vseqzro Delta or Wye only None +/- 0.15 %
Positive Sequence Vseqpos
Negative Sequence Vseqneg
Negative
Unbalance
Vunbalneg
or
Zero Unbalance Vunbalzro
or
Frequency
Freq of sync
channel
Vfreq Any Hz +/- 10 mHz
Rapid Voltage
Change
Vrvc-a Any Max Deviation from 1
sec steady state RMS
as defined in NVE-
1157
% +/- 0.2 %
Vrvc-b
Vrvc-c
Vrvc-d
* +/- 0.05% of FS for input < 40V
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Dranetz hdpq xplorer Specifications

General

Brand	Dranetz
Model	hdpq xplorer
Category	Measuring Instruments
Language	English