GE EPM 5300 User Manual download pdf (Page 6)

CHAPTER 1: AC POWER MEASUREMENT

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:

EEE

acbcab

cnbnan

=====

1) Delta

2) Wye

Figure 1.3: Three-Phase System: (1) Delta, (2) Wye

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GE EPM 5300 User Manual Page 6