Dranetz hdpq xplorer User Manual

F-1
APPENDIX F
PQ Parameter Calculations
Calculations
Measuring and monitoring power quality (PQ) parameters require several calculations,
i.e. RMS values of voltage and current, etc. Depending on the type of parameter
measured, calculations are performed using samples of monitored waveforms or using
every sample cycle for quick disturbance detection. This section defines the parameters
used in PQ calculations.
Description Abbreviation
Wiring Configuration
Formula
Units Precision
Vo l t s R M S
Derived from
200mS (10/12
cycles 50/60 Hz)
Aggregated to
selected interval
Vrms-a
Vrms-b
Vrms-c
Vrms-d
Single phase
Split phase
Wye
where n=512 samples
Volts +/- 0.1% of
Reading *
15 KHz BW
Vrms-ab
Vrms-bc
Vrms-ca
Measured for Delta
Calculated for Wye
Vo l t s D C
Derived from
200mS (10/12
cycles 50/60 Hz)
Aggregated to
selected interval
Vdc-a
Vdc-b
Vdc-c
Vdc-d
Single phase
Split phase
Wye
where n=512 samples
Volts +/- 0.2% of
Reading *
Vdc-ab
Vdc-bc
Vdc-ca
Measured for Delta
Calculated for Wye
Volts ½ cycle slide
Cyclic RMS of full
cycle restarted
every ½ cycle
(used in Sag/Swell
detection)
Vcyc-a
Vcyc-b
Vcyc-c
Vcyc-d
Single phase
Split phase
Wye
where n=512 samples
Volts +/- 0.2% of
Reading *
Vcyc-ab
Vcyc-bc
Vcyc-ca
Measured for Delta
Calculated for Wye
DC of individual
Cycle
Vcycdc-a
Vcycdc-b
Vcycdc-c
Vcycdc-d
Single phase
Split phase
Wye
where n=512 samples
Volts +/- 0.2% of
Reading *
Vcycdc-ab
Vcycdc-bc
Vcycdc-ca
Measured for Delta
Calculated for Wye
* +/- 0.05% of FS for input < 40V
NOTE: The parameter specifications provided in this section are for reference only and
are subject to change without notice.
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Dranetz hdpq xplorer Specifications

General

Brand	Dranetz
Model	hdpq xplorer
Category	Measuring Instruments
Language	English