Thytronic XMR-T - Page 36

36
FUNCTION CHARACTERISTICS
Direct
• Frequency. The measure of period is taken preferably from voltage inputs; when all voltage are
missing the input current are employed.
Samples are processed by means DFT (Discrete Fourier Transform) algorithm and the phase and
amplitude of fundamental are computed:
• Phase currents I
L1
, I
L2
, I
L3
• Phase voltages U
L1
, U
L2
, U
L3
• Residual current I
E
• Residual voltage U
E
(traditional VT inputs only)
F.ai
(Hz)
(Hz)
u
L1
u
L2
U
L1
U
L2
ACQUISITION
VT or ThySensor
CT or ThySensor
≈
≈
u
L3
U
L3
I
L1
I
L2
I
L3
≈
i
L1
i
L2
≈
≈
i
L3
≈
f
T
f
T
IL1.ai
(I
n
)
i
L1
, i
L2
, i
L3
DFT
CTs or ThySensor
I
L1
, I
L2
, I
L3
≈
≈
ACQUISITION
u
L1
, u
L2
, u
L3
DFT
U
L1
, U
L2
, U
L3
(E
n
)
UL1.ai
VTs or ThySensor
≈
≈
ACQUISITION
IE.ai
(I
En
)
ACQUISITION
i
E
DFT
CT
≈
I
E
UE.ai
(U
En
)
(U
En
)
ACQUISITION
u
E
DFT (fundamental)
VT
≈
U
E
DFT (3rd harmonic)
U
E3H
XMR-T EQUIPMENT MANUAL
Ed. 2.9 - 02/2021