5.2.2
Outputs for signalling
Output contacts SO1 and SO2 in slot X100 can be used for signalling on start and
tripping of the protection relay. On delivery from the factory, the start and alarm
signals from all the protection stages are routed to signalling outputs.
Table 21:
Output contacts X100:10...14
Terminal
Description
X100:10
SO1, common
X100:11
SO1, NC
X100:12
SO1, NO
X100:13
SO2, NO
X100:14
SO2, NO
5.2.3
IRF
The IRF contact functions as an output contact for the self-supervision system of the
protection relay. Under normal operating conditions, the protection relay is energized
and the contact is closed (X100:3-5). When a fault is detected by the self-supervision
system or the auxiliary voltage is disconnected, the contact X100:3-5 drops off and the
contact X100:3-4 closes.
Table 22:
IRF contact
Terminal
Description
X100:3
IRF, common
X100:4
Closed; IRF, or U
aux
disconnected
X100:5
Closed; no IRF, and U
aux
connected
1MRS757455 E
Section 5
Protection relay's physical connections
REB611
65
Application Manual
