Setting Examples For Iec/Uca 61850-9-2Le And Time Synchronization - ABB REC670 Applications Manual

1MRK 511 401-UEN A
20.3.2.3
Bay control REC670 2.2 IEC
Application manual
Setting examples for IEC/UCA 61850-9-2LE and time
synchronization
The IED and the Merging Units (MU) should use the same time reference
especially if analog data is used from several sources, for example from an internal
TRM and an MU, or if several physical MUs are used. Having the same time
reference is important to correlate data so that channels from different sources refer
to the correct phase angle.
When only one MU is used as an analog source, it is theoretically possible to do
without time synchronization. However, this would mean that timestamps for
analog and binary data/events become uncorrelated. If the IED has no time
synchronization source configured, then the binary data/events will be
synchronized with the merging unit. However, the global/complete time might not
be correct. Disturbance recordings then appear incorrect since analog data is
timestamped by MU, and binary events use the internal IED time. It is thus
recommended to use time synchronization also when analog data emanate from
only one MU.
An external time source can be used to synchronize both the IED and the MU. It is
also possible to use the MU as a clock master to synchronize the IED from the MU.
When using an external clock, it is possible to set the IED to be synchronized via
PPS,IRIG-B or PTP. It is also possible to use an internal GPS receiver in the IED
(if the external clock is using GPS).
Section 20
Station communication
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