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IM02601004E
Page 181
12 Glossary
9’s of Availability
A measurement used to show the availability of service. The
9’s translate into how much downtime is allowed per year.
90.0000% = 37 days
99.0000% = 3.7 days
99.9000% = 8.8 hours
99.9900% = 53 minutes
99.9990% = 5.3 minutes
99.9999% = 32 seconds
Apparent Power
For sinusoidal quantities in either single-phase or polyphase
circuits, apparent power is the square root of the sum of the
squares of the active and reactive powers.
AWG
American Wire Gauge. Standard wire-cross section area.
CBEMA Factor
A transformer harmonic derating factor (THDF) defined as a
pure sine wave’s crest factor (1.4141) divided by the mea-
sured crest factor.
Crest Factor
Ratio of peak current to rms current. A pure sine wave has a
crest factor of 1.414.
CT (Current Transformer)
An instrument transformer that is intended to have its primary
winding connected in series with the conductor carrying the
current to be measured or controlled.
Demand
The average value of power or a related quantity over a
specified interval of time.
dv/dt
Delta voltage divided by delta time.
Flicker
A variation of input voltage, either magnitude or frequency,
sufficient in duration to allow visual observation of a change
in electric light source intensity. See EN 61000-4-15 for
details.
Fourier Coefficients
Fourier Series
A single-
valued periodic function (that fulfills certain mathematical con
-
ditions) may be represented by a Fourier series as follows:
Note: 0.5A0 is the average of a periodic function f(x) over one
primitive period.
12 GLOSSARY
Summary of Contents for Power Xpert PXM 4000
Page 1: ...User and Installation Manual IM02601004E Power Xpert PXM 4000 6000 8000 ...
Page 8: ...Page vi IM02601004E www eaton ...
Page 19: ...www eaton com IM02601004E Page 11 1 Introduction ...
Page 24: ...Page 16 IM02601004E www eaton ...
Page 36: ...Page 18 IM02601004E www eaton com 2 Quick Start Guide for the Meter Module ...
Page 45: ...www eaton com IM02601004E Page 37 3 Installation 3 8 MeterDimensions ...
Page 46: ...Page 38 IM02601004E www eaton 3 Installation Dimension Con t ...
Page 47: ...www eaton com IM02601004E Page 39 3 Installation Dimension Con t ...
Page 48: ...Page 40 IM02601004E www eaton 3 Installation Dimension Con t ...
Page 53: ...www eaton com IM02601004E Page 45 3 Installation ...
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Page 75: ...www eaton com IM02601004E Page 67 4 Introduction to Web Server Screens ...
Page 76: ...Page 68 IM02601004E www eaton 4 Introduction to Web Server Screens ...
Page 86: ...Page 78 IM02601004E www eaton 5 Introduction to the Local Graphical Display ...
Page 108: ...Page 100 IM02601004E www eaton 6 Functions on the Web Server Pages ...
Page 128: ...Page 120 IM02601004E www eaton 7 Functions on the Graphical Display ...
Page 164: ...Page 156 IM02601004E www eaton 8 Setup on the Web Server Pages ...
Page 198: ...Page 190 IM02601004E www eaton A MODBUS Communication ...
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Page 252: ...Page 244 IM02601004E www eaton D Diagnostics ...
Page 254: ...Page 246 IM02601004E www eaton D Diagnostics ...