CHAPTER 1: AC POWER MEASUREMENT
2
EPM 5000 series Advanced Power Meters
GE Multilin
Apparent Power (VA)
Real Power (W)
Reactive
Power
(VAR)
Figure 1.2
: Relationship between apparent, real
and reactive power
Ideal power distribution should have a PF of 1. This condition can be met only if no reactive power
loads exist. In real life applications, many loads are inductive loads. Often, corrective capacitors are
installed to correct Poor Power Factor (see Section 1.3).
1.2: Three-Phase System
A
three-phase system
delivers higher levels of power for industrial and commercial applications; the
three phases correspond to three potential lines. A 120° phase shift exists between the three potential
lines.
A typical configuration has either a Delta connection or a Wye connection (see
Figure 1.3,
below).
In a three-phase system, the voltage levels between the phases and the neutral are uniform and defined
by:
3
E
3
E
3
E
E
E
E
ac
bc
ab
cn
bn
an
=
=
=
=
=
B
A
C
N
A
B
C
1) Delta
2) Wye
Figure 1.3
: Three-Phase System: (1) Delta, (2) Wye
Summary of Contents for EPM 5300
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Page 30: ...CHAPTER 4 COMMUNICATION INSTALLATION 26 EPM 5000 series Advanced Power Meters GE Multilin...
Page 70: ...CHAPTER 10 PROGRAMMING GROUP 1 66 EPM 5000 series Advanced Power Meters GE Multilin...
Page 88: ...CHAPTER 14 EXITING PROGRAMMING MODE 84 EPM 5000 series Advanced Power Meters GE Multilin...
Page 94: ...CHAPTER 15 PROGRAMMING QUICK REFERENCE 90 EPM 5000 series Advanced Power Meters GE Multilin...
