ABB RELION RET670, Installation And Commissioning Manual

Page: 70 / 240

• Optical ports X311: A, B (Tx, Rx) and X311: C, D (Tx, Rx) on OEM are used
for IEC 61850-8-1 communication. 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 or IEC
60870-5-103 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.
5.5.2 Connecting remote communication interfaces LDCM
The Line Data Communication Module (LDCM), see figure 22 is the hardware
used for the transfer of binary and analog signal data between IEDs in different
protection schemes on the IEEE/ANSI C37.94 protocol. The optical ports on the
rear side of the IED are X302, X303, X312 and X313. For location of LDCM, refer
to section
"Rear side connectors" .
Section 5
1MRK 504 088-UEN C
Installing the IED
64
Installation and commissioning manual