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251/02 en
4 Parametering
4.10.2
Z-Compensation
For correct setting of the parameters the voltage rise (
Δ
U)
has to be calculated in consideration of the current.
Calculation of the required setting values:
Setting the limitation for
D
Umax (LIMIT)
The value is set by pressing the function keys SET and
. If compensation is set to a certain value while
avoidance of excessive transformer voltage rises (e.g. in case
of an unusually high load) is desired, the limit values can be
set to the desired voltage level.
If no compensation is desired, the value „0“ is to be set.
Setting the voltage rise (VOLTRISE)
The calculated percentage of the voltage rise, referred to the
desired voltage level, is set by pressing the function keys SET
and
. If no compensation is desired, the value „0“ is
to be set (link with
®
LIMIT).
4.11
Analog remote position indication (option)
Optionally, the voltage regulator TAPCON
®
230 VC is
available with an analog control/activation of the remote
position indication. This option requires an analog module.
The following analog values can be processed:
•
4 – 20 mA
•
Potentiometer range with a minimum total resistance of
50
Ω
, up to a maximum total resistance of 2 k
Ω
.
Press the SET and
function keys to set the
respective minimum and maximum positions.
For POS MIN, please enter the position corresponding to e.g.
4mA; for POS MAX, please enter the position corresponding
to e.g. 20mA.
The analog position indication will be included automatically
if the TAPCON® 230 VC is equipped with the parallel
operation option.
Calculation of the required setting values:
UTr - ULoad IN . RCT
Δ
U (%) =
=
=
=
= 100 •
•
ULoad
I
Δ
U
= Setting of Z-Compensation in %
UTr = Transformer voltage at current
I
ULa = Line end voltage at current
I
and with the same
service position of the tap-changer
I
= Load current in A
IN
= Rated current in A of the selected current trans-
former connection to the voltage regulator,
i.e. 0.2 A or 1 A or 5 A
RCT = Current transformer ratio, e. g. 200 A / 5 A
If the active voltage drops Ur and reactive voltage drops Ux
are set correctly, then the line end voltage will remain
constant regardless of load.
Ur = IN
.
RCT
.
r
.
L
(V)
RVT
Ux = IN
.
RCT
.
x
.
L
(V)
RVT
Where
Ur
= LDC setting for resistive line voltage drop in V
Ux
= LDC setting for inductive line voltage drop in V
IN
= Rated current in A of the selected current trans-
former connection to the voltage regulator,
i.e. 0.2 A or 1 A or 5 A
RCT = Current transformer ratio, e. g. 200 A/ 5 A
RVT = Voltage transformer ratio, e. g.
30000 V /
Ö
3
100 V
r
= Ohmic resistance of line in
Ω
/ km per phase
x
= Inductive reactance of line in
Ω
/ km per phase
L
= Length of line in km
Z-COMP VOLTRISE
0.0%
(0.0% - 15.0%)
17/30
Z-COMP LIMIT
0.0%
(0%- 15.0%)
18/30
POS MIN
1
(-35 – 35)
20/30
POS MAX
35
(-35 – 35)
21/30