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1 Introduction
Where the phase difference between the Current and the Potential is the result of a non-resistive
load, which can be either capacitive or reactive.
Reactive Power (VAR) is defined as any additional power consumed by the load that doesn’t do
any actual work. You can think of this as a measure of the inefficiency of the system. VAR is calcu
-
lated as:
Apparent Power (VA) is defined as the total power that’s delivered to the load. It’s the vector sum
of the Power (W) and the Reactive Power (VAR).
Power Factor (PF) is the ratio between Power (W) and the Apparent Power (VA). Ideally, the power
factor should be 1; however, this can only occur if there are no inductive loads. In actuality, many
loads are inductive and capacitors are installed to correct a poor Power Factor. Power Factor (PF)
is calculated as:
THREE-PHASE
Three-phase is typically used for power transmission, but is also often used to power motors and
other industrial or commercial equipment. In three-phase systems, three conductors carry three
alternating currents of the same frequency. One conductor is the reference and the remaining con-
ductors have their currents delayed by one-third and two-thirds of a cycle.
Three-Phase Current
Phase A
Phase C
Phase B
Typically, three-phase systems use either a Delta connection or a Wye conncetion, as shown in the
following figure:
Typical Three-Phase Systems
B
A
C
A
N
B
C
4-Wire “Wye”
3-Wire “Delta”
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 ...
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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 ...
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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 ...