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9.
Appendix
ME96SS Calculation Method (3-Phase Unbalanced System with Neutral)
The following table shows general calculation definitions of electric energy measurement this instrument
employs.
Item
RMS
current
in
phase p
Calculated
RMS
neutral current
Phase p to neutral
RMS voltage
Phase p to phase g
RMS voltage
Active
power
for
phase p
Apparent power for
phase p
Reactive power for
phase p
Power
factor
for
phase p
Total active power
Total
reactive
power
Total
apparent
power
Total power factor
Normal mode
I
1
1
M
−
(
∑
Q
=
Qp
=
⋅
v
p
quad
M
k
0
=
P
p
PF
=
p
P
2
+
p
N
ph
∑
Q
=
Q
p
1
p
=
N
ph
∑
S
=
S
p
1
p
=
P
PF
=
2
P
+
Q
IEC (A) mode
1
M
−
∑
2
i
k p
I
=
k
=
0
p
M
M
−
1
(
)
∑
i
+
i
+
i
1
2
3
k
k
k
=
k
=
0
N
M
1
M
−
∑
2
v
k p
V
=
k
=
0
p
M
M
1
(
)
−
∑
2
2
2
v
−
v
k p
k g
U
=
k
=
0
pg
M
1
M
−
1
(
)
∑
P
v
i
=
⋅
×
p
k p
k p
M
k
=
0
S
V
I
=
×
p
p
p
)
×
i
Q
p
p
k
−
N
4 /
k
Q
2
p
N
ph
∑
P
P
=
p
p
=
1
2
Q
=
S
N
ph
∑
S
=
1
p
=
2
126
IEC (V) mode
2
S
2
P
2
=
−
p
p
p
P
p
PF =
p
S
p
N
ph
∑
Q
=
Q
2
−
P
p
1
p
=
S
S
P
2
Q
2
=
+
p
P
PF =
S
Notes
For the sign,
refer
to
5.1.12.
For the sign,
refer
to
5.1.12.
For the sign,
refer
to
5.1.12.
For the sign,
refer
to
5.1.12.
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