MR ETOS TD, Operating Instructions Manual

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9 Visualization
Maschinenfabrik Reinhausen GmbH 2020 223 4453918/14 EN ETOS
®
TD
9.25 On-load tap-changer monitoring
9.25.1 Changing tap position designation (optional)
This function allows you edit the designation of the tap position. The desig-
nations are displayed on the main screen when each of the tap positions is
active and are used for the control system.
Settings Tap position table
Raw value Tap position Control system
1 1 1
2 2 2
3 3 3
4 4 1
5 5 2
6 6 1
7 7 3
8 8 4
9 9 5
10 10 6
Accept Cancel
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EN CHANGE REBOOT admin 23.03.2020 08:08
Figure 158: Tap position table
1. Go to Settings > Tap position table .
2. Enter the designation for the tap position and for the control system.
3. Click on the Accept button.
9.25.2 Setting the TCR calculation factor (optional)
If you only measure the voltage and current on the high-voltage side of the
transformer, you can set the TCR (Transformer Current Rating) calculation
factor for each tap position of the on-load tap-changer using this function.
The device uses this calculation factor to calculate the current on the low-
voltage side depending on the current tap position.
The TCR calculation factor is defined as the ratio of the current on the low-
voltage side (
I
LV
) to the high-voltage side ( I
HV
):
TCR =
I
LV
I
HV