Measurement-computing WavePort 312P rev.1.0 Manual do Utilizador descarregar pdf (Página 82)

Glossary

11-6 Glossary PowerVista/312 User’s Manual

Watts and Vars

Fundamental Watts and Vars are defined from pre-calculated voltage and current vectors via the power

equation. In the equation below, S, V and I are complex vectors while P and Q are scalars.

= P

+ jQ

= V

•

••

•

RMS Watts and Vars are defined from the power equation as well. Vrms and Irms below are pre-calculated

magnitudes, and magnitude of complex power is on the left. S is termed volt-amperes, VA or KVA or MVA.

RMS

= V

RMS

•

••

•

RMS

To determine RMS Watts and Vars, we need either P

rms

or Q

rms

. It is known that average power is also RMS

power or:

AVE

= P

RMS

Given that P

ave

is pre-calculated, RMS vars can be determined from:

RMS

= SQRT[ 



S

RMS







- P

AVE

]

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WavePort/312P 1
PowerVista/312 User’s Manual 3
Table of Contents 4
1.1 What is PowerVista/312 ? 7
What Does the UPS Option Do? 10
1.1.4 Mounting the Laptop 11
1.1.5 Connecting the PC 12
2.3 Disable Power Management 13
3 Software Framework 17
3.2 File Access 18
3.3 User Configuration 19
3.4 Printing 20
3.5 Copy - Paste Shots 21
3.6 Copy to Clipboard 22
3.7 Tools 23
3.7.3 Cycle Graph Backward 24
3.7.6 Take Snapshot 24
3.8 Window Management 25
3.8.2 Cascade 26
3.8.3 Tile Horizontal 26
3.8.4 Tile Vertical 26
3.8.5 Arrange Icons 27
3.9.1 Main Toolbar 28
3.9.2 Phasing Toolbar 28
3.9.3 Status Bar 29
3.10 Database View 30
3.10.2 Column Descriptions 31
3.12 Input Level Meter 33
3.13 Help 34
4 Device Configuration 35
WARNING ! 36
4.1.1 Differential Inputs 36
4.1.2 Connection Procedure 37
4.1.5 Three Phase Delta 40
4.1.7 Single Phase 41
4.2 System Configuration 42
4.3 Site Information 44
4.4 Preferences 45
4.5 Communication 46
4.6 Calibration 46
5 Phasor Diagram 49
5.3.1 Phasing 50
Connection 51
5.3.3 Harmonics Tabulation 52
5.3.4 Demand Tabulation 53
6 Detailed Harmonics 55
6.3.1 Average Harmonics 57
6.3.3 Maximized Spectra 58
6.3.4 IEEE 519 58
6.3.5 Harmonics Tabulation 59
7 Spectrum Analyzer 61
7.3.1 Hamming Window 62
Channel V1 Spectrum 64
8 Cycle-by-Cycle Capture 65
8.3.4 Flicker 68
9 Event Capture 69
10 Frequency Following 75
Glossary 77
Fourier Transform 78
Fundamental Frequency 78
Harmonic 78
Interruption 78
IT Product 78
Total Power Factor 81
Transient 81
Transformer Derating Factor 81
Watts and Vars 82

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