1MRK 505 353-UEN Section 5
Bay protection functions
Application Manual 37
Bay protection functions REB500
5.2.1.2 Star point setting for bay protection
If a REB500 bay unit includes bay protection functionality with 3-
phase voltage measurement, the mode of VT connection
“3Phase_Star” is mandatory.
Setting example for BP applications
• VT data:
UN primary = 220 kV / √3
UN secondary = 110 V / √3
Connection to REB500: 3 phases_star (mandatory connection)
• Settings made in HMI500
VT connection: 3 phases_star (mandatory setting)
Primary voltage: 220,000 V
Secondary voltage: 100 V
Scaling factor: 1.1
5.2.1.3 Scaling factor setting for bay protection
The scaling factor only applies to the voltage functions and not to
distance protection.
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