ABB Relion 670 Series Application Manual page 59

1MRK 505 382-UEN E
• LDCM for slot 305: set
• LDCM for slot 306: set
DiffSync defines the method of time synchronization for the line differential function: Echo or
GPS .
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
the line differential function or setting
method.
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
used, the IED is always set as
master.
OptoPower has two settings: LowPower and HighPower .
Short-range LDCM: Use
km.
Medium-range LDCM: Typical distance 80 km for both
Long-range LDCM: Typical distance 120 km for both
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
consumption and keep the heat dissipation at minimum.
HighPower setting adds 3 dBm extra optical power and can be used to increase the
The
margin at distances close to maximum.
Table 11:
Type of LDCM
Type of fibre
Modem type
Contact type
Table continues on next page
Communication set-up, 670/650 series
Application Guide
TerminalNo to 2 and RemoteTermNo to 1
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.
Echo in this case is safe only if there is no risk of varying transmission
Using
asymmetry.
Using Echo in this case is safe only if there is no risk of varying transmission
asymmetry.
Master and the other as Slave . When a modem and multiplexer is
Slave because the telecommunication system provides the clock
LowPower for fibers 0 – 1 km and HighPower for fibers greater than 1
Optical budgets with C37.94 protocol
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
ST
© Copyright 2017 ABB. All rights reserved
Analog and binary signal transfer for line differential protection
Echo keeps it on by using the Echo synchronization
LowPower and HighPower .
LowPower and HighPower .
LowPower setting to minimize the power
Short range (SR) Medium range (MR)
Multi-mode fiber Single-mode fiber
glass 62.5/125 μm glass 9/125 μm
1MRK0002122-AB 1MRK002311-AA
ST FC/PC
Section 4
Block blocks
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
FC/PC
53