Thytronic NC20 - Page 31

31
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Calculated
By means vector addition of direct measures the following are calculated (RMS value of fundamen-
tal components):
Residual current (RMS value of the fundamental component) I
EC
Harmonic distortion factor for phase currents THD
L1
, THD
L2
, THD
L3
Thermal image Δθ
Displacement angle of the I
N
neutral current respect the I
L1
phase current: (φ
N
)Phi
N
Displacement angle of the I
NC
compensated neutral current respect the I
L1
phase current:
(φ
N
)Phi
NC
Maximum RMS value between I
L1RMS
, I
L2RMS
, I
L3RMS
I
Lmax-RMS
Minimum current between I
L1RMS
, I
L2RMS
, I
L3RMS
I
Lmin-RMS
Average current between I
L1RMS
, I
L2RMS
, I
L3RMS
I
L-RMS
Maximum voltage between U
L1
-U
L2
-U
L3
U
Lmax
Average voltage between (U
L1
+U
L2
+U
L3
)/3 U
L
•
•
•
•
•
•
•
•
•
•
IECOMP.ai
(I
n
)
ACQUISITION
i
L1
, i
L2
, i
L3
i
EC
DFT
CT
≈
∑
I
EC
IECOMP.ai
(I
n
)
ACQUISITION
i
L1
, i
L2
, i
L3
i
EC
DFT
CT
≈
∑
I
EC
THD.ai
THD
L1
% (%)
THD
L2
% (%)
THD
L3
% (%)
I
L1RMS
I
L1
THD
L1
% = 100∙I
L1RMS
/ I
L1
I
L2RMS
I
L2
THD
L2
% = 100∙I
L2RMS
/ I
L2
I
L3RMS
I
L3
THD
L3
% = 100∙I
L3RMS
/ I
L3
THD.ai
THD
L1
% (%)
THD
L2
% (%)
THD
L3
% (%)
I
L1RMS
I
L1
THD
L1
% = 100∙I
L1RMS
/ I
L1
I
L2RMS
I
L2
THD
L2
% = 100∙I
L2RMS
/ I
L2
I
L3RMS
I
L3
THD
L3
% = 100∙I
L3RMS
/ I
L3
Theta.ai
I
L1RMS
I
L3RMS
I
L2RMS
I
th
= max(I
L1RMS
, I
L2RMS
, I
L3RMS
)
Δθ
(Δθ
B
)
2
dΔθ
dt
I
B
I
th
Δθ
T+ T+
( )
+=
Theta.ai
I
L1RMS
I
L3RMS
I
L2RMS
I
th
= max(I
L1RMS
, I
L2RMS
, I
L3RMS
)
Δθ
(Δθ
B
)
2
dΔθ
dt
I
B
I
th
Δθ
T+ T+
( )
+=
Fase.ai
ϕ
N
= I
N
- I
L1
ϕ
NC
= ϕ
N
- ϕ
C
ϕ
N
(Phi
N
)
(° )
ϕ
NC
(Phi
NC
)
(° )
I
N
I
NC
I
C
I
L1
Fase.ai
ϕ
N
= I
N
- I
L1
ϕ
NC
= ϕ
N
- ϕ
C
ϕ
N
(Phi
N
)
(° )
ϕ
NC
(Phi
NC
)
(° )
I
N
I
NC
I
C
I
L1
AV-RMS.ai
I
L1RMS
I
Lmax-RMS
I
Lmin-RMS
I
L-RMS
I
L3RMS
I
L2RMS
max(I
L1RMS
, I
L2RMS
, I
L3RMS
)
min(I
L1RMS
, I
L2RMS
, I
L3RMS
)
mean(I
L1RMS
, I
L2RMS
, I
L3RMS
)
AV-RMS.ai
I
L1RMS
I
Lmax-RMS
I
Lmin-RMS
I
L-RMS
I
L3RMS
I
L2RMS
max(I
L1RMS
, I
L2RMS
, I
L3RMS
)
min(I
L1RMS
, I
L2RMS
, I
L3RMS
)
mean(I
L1RMS
, I
L2RMS
, I
L3RMS
)
AV-RMS.ai
I
L1RMS
I
Lmax-RMS
I
Lmin-RMS
I
L-RMS
I
L3RMS
I
L2RMS
max(I
L1RMS
, I
L2RMS
, I
L3RMS
)
min(I
L1RMS
, I
L2RMS
, I
L3RMS
)
mean(I
L1RMS
, I
L2RMS
, I
L3RMS
)
AV-RMS.ai
I
L1RMS
I
Lmax-RMS
I
Lmin-RMS
I
L-RMS
I
L3RMS
I
L2RMS
max(I
L1RMS
, I
L2RMS
, I
L3RMS
)
min(I
L1RMS
, I
L2RMS
, I
L3RMS
)
mean(I
L1RMS
, I
L2RMS
, I
L3RMS
)