ABB RELION 650 SERIES, Applications Manual

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The time synchronization fine tunes the clock.
IEC 60870-5-103 time synchronization
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An IED with IEC 60870-5-103 protocol can be used for time synchronization, but for accuracy
reasons, it is not recommended. In some cases, however, this kind of synchronization is needed,
for example, when no other synchronization is available.
First, set the IED to be synchronized via IEC 60870-5-103 either from IED Configuration/Time/
Synchronization/TIMESYNCHGEN:1 in PST or from the local HMI.
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Figure 113: Settings under TIMESYNCHGEN:1 in PST
Only CoarseSyncSrc can be set to IEC 60870-5-103, not FineSyncSource.
After setting up the time synchronization source, the user must check and modify the IEC
60870-5-103 time synchronization specific settings, under Main menu/Configuration/
Communication/Station communication/IEC60870-5-103.
• MasterTimeDomain specifies the format of the time sent by the master. Format can be:
•
Coordinated Universal Time (
UTC)
• Local time set in the master (
Local)
• Local time set in the master adjusted according to daylight saving time (
Local with DST)
•
TimeSyncMode specifies the time sent by the IED. The time synchronisation is done using the
following ways:
•
IEDTime: The IED sends the messages with its own time.
• LinMasTime: The IED measures the offset between its own time and the master time,
and applies the same offset for the messages sent as in the IEDTimeSkew. But in
LinMasTime it applies the time changes occurred between two synchronised messages.
•
IEDTimeSkew: The IED measures the offset in between its own time and the master time
and applies the same offset for the messages sent.
•
EvalTimeAccuracy evaluates time accuracy for invalid time. Specifies the accuracy of the
synchronization (5, 10, 20 or 40 ms). If the accuracy is less than the specified value, the “Bad
Time” flag is raised. To accommodate those masters that are really bad in time sync, the
EvalTimeAccuracy can be set to Disabled.
According to the standard, the “Bad Time” flag is reported when synchronization has been
omitted in the protection for >23 h.
Section 15 1MRK 505 287-UUS B
Basic IED functions
226 Busbar protection REB650
Application manual
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