Mitsubishi Electric ME96SSEB-MB, User Manual

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75
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 Normal mode IEC mode Notes
RMS current in phase p
M
i
I
M
k
k
p
p




1
0
2
Calculated RMS neutral
current
 
M
i i i
I
M
k
k k k
N



 

1
0
2
3 2 1
Phase p to neutral RMS
voltage
M
v
V
M
k
k
p
p




1
0
2
Phase p to phase g RMS
voltage
 
M
v v
U
M
k
k
g
k
p
pg





1
0
2
2 2
Active power for phase p
 



  
1
0
1
M
k
k
p
k
p p
i v
M
P
Apparent power for phase p
p p p
I V S
 
Reactive power for phase p
 




   
1
0
4 /
1
M
k
k
p
N k
p quad p
i v
M
Qp Q
2 2
p p p
P S Q
 
For the sign,
refer to
5.1.12.
Power factor for phase p
2 2
p p
p
p
Q P
P
PF


p
p
p
S
P
PF

For the sign,
refer to
5.1.12.
Total active power



p h
N
p
p
P P
1
Total reactive power



p h
N
p
p
Q Q
1
For the sign,
refer to
5.1.12.
Total apparent power



p h
N
p
p
S S
1
2 2
Q P S
 
Total power factor
2 2
Q P
P
PF


S
P
PF

For the sign,
refer to
5.1.12.