Vectorial Compensation (Phase and quadrature mode) LDC setting
Refer to the wiring diagram to choose the appropriate mode setting. The negative modes simply
reverse the sense of the compensation voltage which is more convenient than changing the
wiring polarity.
For the correct setting in these modes it is necessary to calculate the resistive and inductive line
voltage drop, referred to the secondary side of the voltage transformer in V and the correct
setting of the existing measuring transformer configuration according to the following formula:
R
CT
U
r
= I
N
.
. r . L
Volts
____
R
VT
R
CT
U
x
= I
N
.
. x . L
Volts
____
R
VT
Where:
U
r
=
LDC setting for resistive line voltage drop in Volts
U
x
=
LDC setting for inductive line voltage drop in Volts
I
N
= rated current in A of the selected current transformer connection to the voltage
regulator, i.e. 1A or 5A
R
CT
=
current transformer ratio, e.g. 200A/5 Amps
R
33,000V /
√
3
VT
=
voltage transformer ratio: e.g.
IN PHASE connection wiring
________________
110V
33,000V
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for the latest product information.
Due to RMS continuous product improvement policy this information is subject to change without notice. 2V164-S_Guide/Iss A - 01/04/09
e.g.
IN QUAD connection wiring
___________
110V
r
=
ohmic resistance of the line in ohm/km per phase
x
=
inductive reactance of the line in ohm/km per phase
L
=
length of the line in km
