EET PMC-33M-A - Page 29

CET Electric Technology
29
Figure 3-5 PF Convention
3) There are two ways to calculate kVA:
Mode V (Vector method):
2
2
totaltotal
kvarkWkVA
total

Mode S (Scalar method):
c
kVAkVAkVAkVA
ba
total

4) There are two ways to calculate THD:
THDf (based on Fundamental):
%100THD
1
2
2




I
I
n
n
where I
n
represents the RMS value for the n
th
harmonic and I
1
represents the RMS value of the
Fundamental harmonic.
THDr (based on RMS):
%100THD
1
2
2
2







n
n
n
n
I
I
where I
n
represents the RMS value for the n
th
harmonic.
5) This menu only appears if the meter is equipped with the corresponding options.