Thytronic NV10B - Signal Processing and Calculated Measures

CHARACTERISTICS
25
NV10B - Manual - 04 - 2022
Samples are processed by means DFT (Discrete Fourier Transform) algorithm and the phase and
amplitude of fundamental are computed:
• Input voltages U
L1
, U
L2
, U
L3
• Residual voltage U
E
Calculated
By means vector addition of direct measures the following are calculated (RMS value of fundamen-
tal components):
• Calculated residual voltage U
EC
• Negative sequence voltage: U
2
Use of over-described measures is shown in the following tables.
UL1-en.ai
ACQUISITION
u
L1
, u
L2
, u
L3
DFT
TV
≈
U
L1
, U
L2
, U
L3
(E
n
)
UE-en.ai
(U
En
)
(U
En
)
ACQUISITION
u
E
DFT (fundamental)
TV
≈
U
E
DFT (3rd harmonic)
U
E3H
UEC.ai
U
L1
U
EC
= U
L1
+ U
L2
+ U
L3
U
EC
U
L3
U
L2
(U
En
)
U2.ai
U
L1
U
2
U
2
= (U
L1
+ e
-j120°
U
L2
+ e
+j120°
U
L3
)
U
L3
U
L2
e
-j120°
= -
√3
j
1
2 2
-
e
+j120°
= -
√3
j
1
2 2
+
(u
n
)