4.3.2.4 Setting examples for IEC 61850-9-2LE and time synchronization
It is important that the IED and the merging units (MU) uses the same time reference.
This is especially true if analog data is used from several sources, for example an
internal TRM and a MU. Or if several physical MU is used. The same time reference is
important to correlate data so that channels from different sources refer to correct
phase angel.
When only one MU is used as analog source it is theoretically possible to do without
time- synchronization. However, this would mean that timestamps for analog and
binary data/events would be uncorrelated. Disturbance recordings will appear incorrect
since analog data will be timestamped by MU and binary events will use internal IED
time. For this reason it is 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 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 or IRIG-
B. It is also possible to use an internal GPS-receiver in the IED (if the external clock is
using GPS).
Using the MU as time source for synchronization
IED
MU
Analog data
PPS
IEC 61850-9-2LE
Synchronization
IEC10000061-1-en.vsd
IEC10000061 V1 EN
Figure 319: Setting example when MU is the synchronizing source
Settings in local HMI under Settings/Time/Synchronization/TIMESYNCHGEN/
IEC 61850-9-2:
Section 4 1MRK504116-UUS C
Station communication
824
Application manual
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