RemoteTermNo is used to assign a number to each related LDCM in the remote
IED. For each LDCM, RemoteTermNo is set to a different value than TerminalNo,
but equal to the TerminalNo of the remote end LDCM. In the remote IED,
TerminalNo and RemoteTermNo are reversed as follows:
• LDCM for slot 305: set TerminalNo to 2 and RemoteTermNo to 1
• LDCM for slot 306: set TerminalNo to 4 and RemoteTermNo to 3
The redundant channel is always configured to the lower position,
for example:
• Slot 305: main channel
• Slot 306: redundant channel
The same is applicable for slot 312-313 and slot 322-323.
DiffSync defines the method of time synchronization for the line differential
function: Echo or GPS.
Using Echo in this case is safe only if there is no risk of varying
transmission asymmetry.
GPSSyncErr: when GPS synchronization is lost, synchronization of the line
differential function continues for 16 s based on the stability in the local IED
clocks. After that, setting Block blocks the line differential function or setting Echo
keeps it on by using the Echo synchronization method.
Using Echo in this case is safe only if there is no risk of varying
transmission asymmetry.
CommSync defines the Master and Slave relation in the communication system,
and should not be mistaken for the synchronization of line differential current
samples. When direct fiber is used, one LDCM is set as Master and the other as
Slave. When a modem and multiplexer is used, the IED is always set as Slave
because the telecommunication system provides the clock master.
OptoPower has two settings: LowPower and HighPower.
Short-range LDCM: Use LowPower for fibres 0 – 1 km and HighPower for fibers
greater than 1 km.
Medium-range LDCM: Typical distance 80 km for both LowPower and
HighPower.
Long-range LDCM: Typical distance 120 km for both LowPower and HighPower.
Section 4 1MRK 505 382-UEN B
Analog and binary signal transfer for line differential protection
64 Communication set-up 670/650 series 2.2
Application Guide
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