ABB Relion 670 series - Local HMI Use and Operations; Logging On to the IED via Local HMI

5.4 PDH telecommunication via C37.94 interface to
transceiver 21-216
5.4.1 Communication requirements
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A PDH telecommunication network set-up can be done via 64 kbit/s C37.94
interface to transceiver type 21-216.
There is a short delay in alarm time, typically 100 ms, for a communication fail in
the relay, and it is derived from the dependability of the line differential protection
function. This requires a high quality communication system as defined in
Appendix
Sample specification of communication requirements. If the
telecommunication network is disturbed for more than 100 ms, an alarm will be
issued.
5.4.2 Communication structure via C37.94 interface to
transceiver 21-216
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LOCAL REMOTE
< 10 m
IED
C37.94
Transceiver
21-216xx
PCM
Multi-mode
fibre-optic
< 3 km
Galvanic
connection
interface
G.703
Internal clock
(master)
External clock
(slave)
External clock
IEC07000260-1-en.vsdx
IED
C37.94
< 10 m
Transceiver
21-216xx
PCM
(slave)
Galvanic
connection
interface
G.703
Multi-mode
fibre-optic
< 3 km
IEC07000260 V1 EN-US
Figure 64: Communication structure via C37.94 interface to transceiver 21–
216
IED
Terminal used for binary signal transfer
Transceiver 21–216 Optical-to-electrical interface converter
PCM Pulse code multiplexer
1MRK 505 382-UEN B Section 5
Communication set-up
Communication set-up 670/650 series 2.2 79
Application Guide