9 Operation
Maschinenfabrik Reinhausen GmbH 2022
129
8595017/00 EN
TAPCON
®
250
To use Z compensation, you need to calculate the voltage increase (ΔU) tak-
ing the current into account. Use the following formula for this purpose:
Δ
U
=
U
Tr
-
U
Load
U
Load
×
I
N
×
k
CT
I
× 100
%
∆U
Voltage increase
I
Load current in A
U
Tr
Transformer voltage at current I I
N
Nominal current of current-trans-
former connection in A
U
Load
Voltage on line end at current I
and on-load tap-changer in
same operating position
k
CT
Current transformer transmission
ratio
Sample calculation: U
Tr
= 100.1 V, U
Load
= 100.0 V, I
N
= 5 A k
CT
= 200 A/5 A,
I = 100 A
Produces a voltage increase ∆U of 0.2%
1. Go to
Settings > Parameters > On-load tap-changer regulator > Com-
pensation
.
2. Select the desired parameter.
3. Set the desired parameter.
4. Press the
Accept
button to save the modified parameter.
Voltage increase
You can use this parameter to set the current-dependent voltage increase
∆U.
Voltage limit value
You can use this parameter to define the maximum permissible voltage in-
crease to avoid excess voltage on the transformer.
9.3.3 U bandwidth monitoring
The following limit values are monitored via bandwidth monitoring. The set
bandwidth (upper/lower) of the voltage regulation is used for this purpose.
Behavior
If the measured value is higher than the upper limit or lower than the lower
limit, the device triggers the
Upper bandwidth limit value / Lower bandwidth
limit value
message.
The "Function monitoring" function is used to detect long periods when val-
ues are above or below the bandwidth. Long periods when values are above
or below the bandwidth indicate a problem with the device function because
the device is not able to correct the control deviation.
Summary of Contents for TAPCON 250
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