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Schneider Electric K series Manual de usuario Pagina 31

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PLSED309039EN PM1000 Series Power Meters
08/2010 Chapter 3 – AC Power Measurement
© 2010 Schneider Electric. All rights reserved.
31
Chapter 3: AC Power Measurement
3-Phase Systems
A 3-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 (Star)
connection
In a 3-phase system, the voltage levels between the phases and the neutral
are ideally defined by V1 = V2 = V3 = V12 / √3 = V23 / √3 = V31 / √3. In
practice, there will be some unbalance (difference).
Voltages between the phases vary, depending on loading factors and the
quality of distribution transformers.
Power measurement in a poly-phase system is governed by Blondel's
Theorem. Blondel’s Theorem states that, in a power distribution network,
which has N conductors, the number of measurement elements required to
determine power is N-1. A typical configuration of a poly-phase system has
either a Delta connection or a Wye (Star) connection (see Figure below).
Where E
AB
= Voltage across points A and B
E
CB
= Voltage across points C and B
E
AN
= Voltage across points A and N (Neutral)
E
BN
= Voltage across points B and N (Neutral)
E
CN
= Voltage across points C and N (Neutral)
I
A
= Current through conductor A
I
B
= Current through conductor B
I
C
= Current through conductor C
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