•
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 fibers 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.
An optical budget calculation should be made for the actual case. For medium range LDCM and
long range LDCM the recommendation is to use the
LowPower setting to minimize the power
consumption and keep the heat dissipation at minimum.
The
HighPower setting adds 3 dBm extra optical power and can be used to increase the
margin at distances close to maximum.
Table 11: Optical budgets with C37.94 protocol
Type of LDCM
Short range (SR)
Short range (SR)
Medium range (MR) Long range (LR)
Type of fibre
Multi-mode fiber
glass 50/125 μm
Multi-mode fiber
glass 62.5/125 μm
Single-mode fiber
glass 9/125 μm
Single-mode fiber
glass 9/125 μm
Modem type
1MRK0002122-AB
1MRK0002122-AB
1MRK002311-AA
1MRK002311-BA
Contact type
ST
ST
FC/PC
FC/PC
Table continues on next page
1MRK 505 382-UEN E
Section 4
Analog and binary signal transfer for line differential protection
Communication set-up, 670/650 series
53
Application Guide
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