ABB Relion REB500, Applications Manual

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Section 5
1MRK 505 353-UEN
Bay protection functions
36 Application Manual
Bay protection functions REB500
5.2 Technical additions
5.2.1 Voltage transformers for bay protection
The HMI500 “ Settings/Voltage transformers/Overview ” tab opens a dialog with
the list of all 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 “Trans-
former 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 ei-
ther 100 V or 200 V. Other voltages are accommodated by appropriately setting the
scaling factor.
This menu item appears only if voltage transformers have been fitted.
Figure 22 Settings/Voltage transformers