ABB RED650 - Page 428

PPS in
IRIG-B
LDCM
diffSync
GPS
3xI 3xI
GPS
IED
Satellite-controlled
clock
Merging unit (MU)
IED
IEC/UCA 61850-
9-2LE
IEC17000070-1-en.vsd
IRIG-B
Satellite-controlled clock
GPS
TRM
IEC17000070 V1 EN-US
Figure 174: Time synchronization of merging unit and IED
The parameter DiffSync for the LDCM needs to be set to GPS and the GPSSyncErr
needs to be set to Block.
In "ECHO" mode MU and IED still need to be synchronized. In this case they can
be synchronized with either PPS or IRIG-B.
Section 21 1MRK 505 393-UEN B
Basic IED functions
422 Line differential protection RED650 2.2 IEC
Application manual