MR ECOTAP VPD CONTROL PRO, Руководство по эксплуатации

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8 Operation
Maschinenfabrik Reinhausen GmbH 2018 96 5252433/02 EN ECOTAP
®
VPD
®
CONTROL PRO
To use Z compensation, you need to calculate the increase in voltage (ΔU)
taking the current into account. Use the following formula for this purpose:
∆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
Transmission ratio of current
transformer
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%
The following sections describe how you can set the parameters you need
for Z compensation.
Selecting Z compensation
To select Z compensation, proceed as follows:
1. Go to Settings > Parameters > Compensation > Compensation
method .
2. Select the Z compensation option.
3. Press the Accept button to save the modified parameter.
Setting the current-dependent voltage increase
You can use this parameter to set the voltage increase ∆U.
To set the limit value for voltage increase ΔU, proceed as follows:
1. Go to Settings > Parameters > Compensation > Voltage increase .
2. Enter voltage increase.
3. Press the Accept button to save the modified parameter.
Setting voltage limit value
You can use this parameter to define the maximum permissible voltage in-
crease to avoid excess voltage on the transformer.
To set the voltage limit value, proceed as follows:
1. Go to Settings > Parameters > Compensation > Voltage limit value .
2. Enter voltage limit value.
3. Press the Accept button to save the modified parameter.