5.6 Making the optical connections
5.6.1 Connecting station communication interfaces
The IED can be equipped with an optical ethernet module (OEM), see figure 26,
needed for IEC 61850 communication and a serial communication module (SLM),
see figure
26 for LON, SPA, IEC 60870–5–103 or DNP3 communication. In such
cases optical ports are provided on the rear side of the case for connection of the
optical fibers. For location of OEM and SLM, refer to section "Rear side
connectors".
• Optical ports X311: A, B (Tx, Rx) and X311: C, D (Tx, Rx) on OEM are used
for IEC 61850-8-1 communication. Both ports AB and CD shall be connected
when redundant IEC 61850-8-1 communication is used. Connectors are of ST
type. When OEM is used, the protection plate for the galvanic connection must
not be removed.
• Optical port X301: A, B (Tx, Rx) on SLM module is used for SPA, IEC
60870-5-103 or DNP3 communication. Connectors are of ST type (glass) or
HFBR Snap in (plastic).
• Optical port X301: C, D (Tx, Rx) on SLM module is used for LON
communication. Connectors are of ST type (glass) or HFBR Snap in (plastic).
The optical fibers have Transmission (Tx) and Reception (Rx) connectors, and they
should be attached to the Tx and Rx connectors of OEM and SLM module (Tx
cable to Rx connector, Rx cable to Tx connector).
Connectors are generally color coded; connect blue or dark grey cable connectors
to blue or dark grey (receive) back-side connectors. Connect black or grey cable
connectors to black or grey (transmit) back-side connectors.
The fiber optical cables are very sensitive to handling. Do not bend
too sharply. The minimum curvature radius is 15 cm for the plastic
fiber cables and 25 cm for the glass fiber cables. If cable straps are
used to fix the cables, apply with loose fit.
Always hold the connector, never the cable, when connecting or
disconnecting optical fibers. Do not twist, pull or bend the fiber.
Invisible damage may increase fiber attenuation thus making
communication impossible.
Please, strictly follow the instructions from the manufacturer for
each type of optical cables/connectors.
Section 5 1MRK 502 029-UEN A
Installing the IED
76
Installation and commissioning manual
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