Interface; Pdh Telecommunication Via C37.94 Interface To External Transceiver C37.94-X.21; Pdh Telecommunication Via C37.94 Interface To Transceiver 21-216; Communication Requirements - ABB Relion 670 Series Application Manual

Section 5
Communication set-up
PCM
5.4.5.1 Service settings for the line differential protection IED with X.21 galvanic

interface

X.21 Micro D-sub 15–pole male connector according to V11 (X:27) balanced version is used for
X.21 communication.
5.4.5.2 PDH telecommunication via C37.94 interface to external transceiver
C37.94-X.21
When the distance between IED and PCM equipment is more than 10 meters and an X.21
interface on the PCM needs to be used, it can be accomplished by using an external converter
from C37.94 to X.21.
LOCAL
IEC18000099 V1 EN-US
Figure 68: PDH Communication structure using PCM with X.21
5.5 PDH telecommunication via C37.94 interface to
transceiver 21-216
5.5.1

Communication requirements

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
70
Pulse code multiplexer
< 10 m
IED
C37.94/X.21
PCM
converter
C37.94
Multi-mode
fibre-optic
< 3 km
Galvanic
connection
interface
G.703
External clock Internal clock
(slave) (master)
Contact your local ABB representative for more details about C37.94 to X.21
converters.
© Copyright 2017 ABB. All rights reserved
< 10 m
PCM C37.94/X.21
converter
Multi-mode
fibre-optic
Galvanic
connection
interface
G.703
External clock
(slave)
Sample specification of
Communication set-up, 670/650 series
1MRK 505 382-UEN E
GUID-66F9DFE3-3D64-4CDB-97D8-19D13F56EA55 v2
GUID-65BB5DA1-51AC-45CA-A482-FE0EB48CB622 v1
REMOTE
IED
C37.94
< 3 km
IEC18000099-1-en.vsdx
GUID-1BF17CA3-93F5-4661-9695-368FE7F359E2 v1
Application Guide