•
IRIG-B
•
GPS+IRIG-B
•
PPS
CoarseSyncSrc which can have the following values:
•
Off
•
SPA
•
LON
•
DNP
•
IEC 60870-5-103
The function input to be used for minute-pulse synchronization is called BININPUT. For a
description of the BININPUT settings, see the
Technical Manual.
The system time can be set manually, either via the local HMI or via any of the communication
ports. The time synchronization fine tunes the clock (seconds and milliseconds).
The parameter
SyncMaster defines if the IED is a master, or not a master for time
synchronization within a Substation Automation System, for IEDs connected in a
communication network (IEC 61850-8-1). The
SyncMaster can have the following values:
•
Off
•
SNTP -Server
Set the course time synchronizing source (
CoarseSyncSrc) to Off when GPS
time synchronization of line differential function is used. Set the fine time
synchronization source (
FineSyncSource) to GPS. The GPS will thus provide the
complete time synchronization. GPS alone shall synchronize the analogue
values in such systems.
All protection functions will be blocked if the AppSynch parameter is set to
Synch while there is no 9-2 synchronization source. For more information
please refer to the "IEC/UCA 61850-9-2LE communication protocol" section.
22.13.2.3
Process bus IEC 61850-9-2LE synchronization
GUID-6E384BDB-5598-4108-99B4-0B4A4E1828B2 v3
When process bus communication (IEC 61850-9-2LE protocol) is used, it is essential that the
merging units are using the same time source as the IED. To achieve this, a satellite-controlled
clock shall provide time synchronization to the IED (either internal GPS or via IRIG-B 00x with
IEEE1344 support) and to the merging units (via for instance PPS). For the time
synchronization of the process bus communication, GPS Time Module (GTM) and/or IRIG-B
module can be used. If the IED contains a GTM, the merging unit can be synchronized from the
PPS output of the GTM.
22.13.2.4
Time synchronization for differential protection and IEC 61850-9-2LE
sampled data
GUID-413328FC-47E2-499B-8E11-AD51EF1B525A v2
When using differential communication in conjunction with sampled data received from
merging units (MU) over the IEC 61850-9-2LE process bus, the MU and the IED needs to be
controlled by the same GPS synchronized clock. The required accuracy is +/- 2 µs. The MU
needs to get an optic PPS signal from the clock in order to take samples at the correct time
1MRK 505 343-UEN B
Section 22
Basic IED functions
731
Application manual
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