•
HwSyncSrc
: set to
Off
•
AppSynch
: set to
NoSynch
. This means that protection functions will not be blocked
•
SyncAccLevel
: set to
unspecified
Settings in PST in PCM600 under: Hardware/Analog modules/Merging units/MU01
•
SyncMode
: set to
NoSynch
. This means that the IED do not care if the MU indicates loss of
time synchronization.
• TSYNCERR signal will not be set since there is no configured time synchronization source
• SYNCH signal on the MU_4I_4U function block indicates when protection functions are
blocked due to loss of internal time synchronization to the IED. Since
AppSynch
is set to
NoSynch
this signal will not be set.
• MUSYNCH signal on the MU_4I_4U function block will be set if the datastream indicates
time synchronization is lost. However, protection functions will not be blocked.
To get higher availability in the protection functions, it is possible to avoid blocking if time
synchronization is lost when there is a single source of analog data. This means that if there is
only one physical MU and no TRM, parameter
AppSynch
can be set to
NoSynch
but parameter
HwSyncSrc
can still be set to
PPS
. This will keep analog and binary data correlated in
disturbance recordings while not blocking the protection functions if PPS is lost.
18.4 LON communication protocol
IP14420-1 v1
18.4.1 Application
IP14863-1 v1
M14804-3 v3
Control Center
IED IEDIED
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
IEC05000663-1-en.vsd
IEC05000663 V2 EN-US
Figure 208: Example of LON communication structure for a substation automation
system
An optical network can be used within the substation automation system. This enables
communication with the IEDs through the LON bus from the operator’s workplace, from the
control center and also from other IEDs via bay-to-bay horizontal communication.
The fiber optic LON bus is implemented using either glass core or plastic core fiber optic
cables.
Section 18 1MRK 511 358-UEN A
Station communication
420
Application manual
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