Omron K7DD User Manual page 160

A Appendices
ID Feature
Current
fundamental
10
amplitude
I
Fnd
0.5th order
harmonic
11
current
I I
0.5 = HD0.5
1.5th order
harmonic
12
current
I I
1.5 = HD1.5
: :
63rd order
harmonic
135
current
I I
63 = HD63
Current total
harmonic
136
distortion
I
THD
A - 16
3P3W2M
Primary harmonics (fundamental wave)
when calculating harmonics
c : Measuring channel (1 to 3)
Ik
(c)
× 100 [%]
HDk(c) =
I
I1
(c)
c : Measuring channel (1 to 3)
k : Harmonic order (0.5, 1.5 to 62.5, 63)
I1: Fundamental wave
Σ
K
Ik
k=2
THD(c) =
I
I1
(c)
c : Measuring channel (1 to 3)
K : 63
k : Integer order harmonics (2 to 63)
I1: Fundamental wave
Wiring state
3P4W
I1
(c)
c : Measuring channel (1)
k : Harmonic order
(0.5, 1.5 to 62.5, 63)
I1: Fundamental wave
2
(c)
× 100
c : Measuring channel (1)
K : 63
k : Integer order harmonics (2 to 63)
I1: Fundamental wave
Power Line Data Generator User's Manual (N233)
Single phase current
Primary harmonics
I1
(fundamental wave)
(c)
when calculating harmonics
c : Measuring channel (1)
Ik
(c)
× 100 [%]
HDk(c) =
I
I1
(c)
I
THD(c)
Σ
K 2
Ik
(c)
k=2
× 100
=
I1
(c)