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REF 610
124
Feeder Protection Relay
Technical Reference Manual
Output contacts PO1, PO2 and PO3 are heavy-duty trip contacts capable of
controlling most circuit breakers (see table 4.2.1-4). The signals to be routed to
PO1...PO3 are selected with the switches of switchgroups SGR1...SGR3. On
delivery from the factory, the trip signals from all the protection stages are routed to
PO1, PO2 and PO3.
Output contacts SO1...SO5 can be used for signalling on start and tripping of the
relay (see table 4.2.1-4). Output contacts SO3...SO5 are optional and available only
if the optional I/O module has been installed. The signals to be routed to SO1...SO5
are selected with the switches of switchgroups SGR4...SGR8. On delivery from the
factory, the start and alarm signals from all the protection stages are routed to SO1
and SO2.
The IRF contact functions as an output contact for the self-supervision system of the
protection relay (see table 4.2.1-3). Under normal operating conditions the relay is
energized and the contact closed (X4.1/3-5). When a fault is detected by the
self-supervision system or the auxiliary voltage is disconnected, the output contact
will drop off and the contact close (X4.1/3-4).
Fig. 4.2.1.-1...Fig. 4.2.1.-3 present a rear view of REF 610, showing four connecting
sockets: one for measuring transformers, one for the optional I/O module, one for
power supply and one for optional serial communication.
X3.1
X4.1
1
2
3
X5.1
4
5
6
X5.2
7
8
9
TX
10
X5.3
11
12
RX
13
14
15
TX
16
17
X5.4
18
RX
19
20
21
22
23
24
Fig. 4.2.1.-1
Rear view of REF 610 with the fibre-optic communication module
for plastic and glass fibre with light sensor inputs
X2.1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1MRS 755310
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