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IM02601004E
Page 111
7 Functions on the Graphical Display
7.4. Quality
The Quality section of the Power Xpert Meter outlines the measurements that have been calculated
and describes the health of the system. It includes:
•
TDD Current
•
THD Voltage
•
K Factor
•
Crest Factor
•
Flicker,
•
9’s of Availability(Compliance)
•
PQ Index
%THD
The Total Harmonic Distortions (THD) is the ratio, expressed as a percent, of the rms value of the
ac signal after the fundamental component is removed and inter-harmonic components are ignored,
to the rms value of the fundamental. The formula for THD is provided below. The variables X
1
and
x
n
may represent voltage or current and may be expressed as rms or peak values, as long as all are
expressed in the same fashion.
X
1
= fundamental value of current or voltage.
x
n
= nth harmonic value of current or voltage.
THD CURRENT AND %TDD CURRENT
The THD Current is calculated for phase A, B and C as Ampere; meanwhile, the %TDD is calcu-
lated as a precentage of the peak demand current. The THD Current is individually measured for
Odd, Even and Inter Harmonics. Maximum THD Current is determined using individual phase THD
Currents. All of the THD Current measurements in the meter are trended. Minimum and maximum
values are logged with date and time stamps.
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 ...
Page 54: ...Page 46 IM02601004E www eaton 3 Installation ...
Page 55: ...www eaton com IM02601004E Page 47 3 Installation ...
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Page 66: ...Page 58 IM02601004E www eaton 3 Installation ...
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 ...