1MRK 505 350-UEN Section 3
System Settings
Technical Manual 27
Distributed busbar protection REB500
3.4 Voltage transformers
The “Overview” tab opens a dialog with a list of all the voltage transformers in the
single-line diagram with their labels, bay labels primary and secondary rated
voltages.
In the “Details” view the description can be edited in the input field “Markings”.
The ratio is determined by the primary and secondary ratings entered in the
“Transformer ratio” input field. The VT input is a single winding, which is suitable
for all the main VT secondary ratings, the effective voltage being set via HMI500
to either 100 V or 200 V. Other voltages are accommodated by appropriately set-
ting the scaling factor. The mode of VT connection (star or delta) and the scaling
factor are entered in addition to the primary/ secondary rating. The scaling factor
adjusts the setting for the rated secondary voltage to equal the effective rated
secondary voltage.
This menu item appears only if voltage transformers have been fitted.
Setting example
• VT data:
UN primary = 220 kV / √3
UN secondary = 110 V / √3
Connection to REB500: 3 phases_star
• Settings made in HMI500
VT connection: 3 phases_star
Primary voltage: 220,000 V
Secondary voltage: 100 V
Scaling factor: 1.1
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