Alstom iSTAT M232 - Page 70

User Manual M2x2/EN M/F
iSTAT M2x2 Page 68
THD

100
I
In
%THDI
1
63
2n
2
f



Current THD
I
1
− value of first harmonic
n − number of harmonic

100
U
nU
%THDU
1f
63
2n
2
f
f



Phase voltage THD
U
1
− value of first harmonic
n − number of harmonic

100
U
nU
%THDU
1
ff
63
2n
2
ff
ff



Phase-to-phase voltage THD
U
1
− value of first harmonic
n − number of harmonic