Hitachi Relion 670 Series Applications Manual page 380
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Section 18
Station communication
IEC/UCA 61850-9-2LE
IEC10000075 V2 EN-US
Figure 190:
It is also possible to use IEC/UCA 61850-9-2LE communication without time synchronization.
Settings on the local HMI under Main menu/Configuration/Time/Synchronization/
TIMESYNCHGEN:1/IEC61850-9-2:
•
HwSyncSrc: set to Off
•
SyncLostMode: set to No block to indicate that protection functions are not blocked
•
SyncAccLevel: set to unspecified
Two status monitoring signals with no time synchronization:
•
SYNCH signal on the MUx function block indicates that protection functions are blocked due to
loss of internal time synchronization to the IED. Since SyncLostMode is set to No block, this
signal is not set.
•
MUSYNCH signal on the MUx function block is set if the datastream indicates time
synchronization loss. However, protection functions are not blocked.
To get higher availability in protection functions, it is possible to avoid blocking during time
synchronization loss if there is a single source of analog data. This means that if there is only one
physical MU and no TRM, parameter SyncLostMode is set to No block but parameter HwSyncSrc is
still set to PPS. This maintains analog and binary data correlation in disturbance recordings without
blocking protection functions if PPS is lost.
18.3.5
IEC 61850 quality expander QUALEXP
The quality expander component is used to display the detailed quality of an IEC/UCA 61850-9-2LE
analog channel. The component expands the channel quality output of a Merging Unit analog
channel received in the IED as per the IEC 61850-7-3 standard. This component can be used during
the ACT monitoring to get the particular channel quality of the Merging Unit.
Figure
191
374
IED
Data
MU
IEC10000075=2=en=Original.vsd
Setting example without time synchronization
depicts the usage of the quality expander block in ACT.
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