Omron K7DD User Manual page 158

A Appendices
ID Feature
Voltage
3 unbalance
V
Unb
Voltage
fundamental
4
amplitude
V
Fnd
Voltage total
harmonic
5
distortion
V
THD
A - 14
3P3W2M
1 − 3 - 6β
× 100 [%]
Unb =
V
1 ＋
3 - 6β
4 4
V1 ＋ V1 ＋ V1
(12) (23)
=
β
(
2 2
V1 ＋ V1 ＋ V1
(12) (23)
− 2×V1
2 2
=
V1 V1 ＋ V1
(1) (2)
(12)
− 2×V1
2 2
=
V1 ＋ V1
V1
(2) (3)
(23)
− 2×V1
2 2
=
V1 ＋ V1
V1
(31) (3) (1)
V1 V1 V1
、 、 ：Fundamental wave voltage
(1) (2) (3)
θ1 θ1 θ1
、 、 ：Angle defined by each fundamental wave voltage
(12) (23) (31)
Primary harmonics (fundamental wave) when
calculating harmonics of voltage between lines
Fnd(12) =
V V1
(12)
Fnd(23) =
V V1
(23)
Fnd(31) =
V V1
(31)
Σ
K
Vk
(12)
k=2
THD(1) =
V
V1
(12)
Σ
K
Vk
(23)
k=2
THD(2) =
V
V1
(23)
Σ
K
Vk
(31)
k=2
THD(3) =
V
V1
(31)
K : 63
k : Harmonic order
V1: Fundamental wave
Wiring state
4
(31)
V1 , V1 , V1
(12) (23)
2
)
2
voltage between lines
(31)
×V1 ×cosθ1
(1) (2) (12)
×V1 ×cosθ1
(2) (3) (23)
×V1 ×cosθ1
(3) (1) (31)
Primary harmonics (fundamental wave) when
calculating harmonics of phase voltage
Fnd =
V V1
c : Measuring channel (1 to 3)
2
× 100
2
THD(c) =
V
× 100
c : Measuring channel (1 to 3)
2
K : 63
× 100
k : Harmonic order
V1: Fundamental wave
Power Line Data Generator User's Manual (N233)
3P4W
:
Fundamental wave of
(31)
(c)
Σ
K 2
Vk
(c)
k = 2
× 100
V1
(c)