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1–4 EPM 5300 SERIES ADVANCED POWER METERS – INSTRUCTION MANUAL
THREE-PHASE SYSTEM CHAPTER 1: AC POWER MEASUREMENT
FIGURE 1–4: Poly Phase System: (1) Delta, (2) Wye
N
A
B
C
2) Wye
X
E I
CN C
X
X
P = E I + E I + E I
AN
BN CN
E I
BN B
E I
AN A
B
A
C
1) Delta
X
X
E I
CB C
E I
AB A
P = E I
AB A
+ E I
CB C
ABC