![background image](http://html1.mh-extra.com/html/abb/relion-670-series/relion-670-series_applications-manual_3052129715.webp)
RemoteTermNo: This setting assigns a number to each related LDCM in the remote IED. For
each LDCM, the parameter
RemoteTermNo shall be set to a different value than parameter
TerminalNo, but equal to the TerminalNo of the remote end LDCM. In the remote IED the
TerminalNo and RemoteTermNo settings are reversed as follows:
•
LDCM for slot 302: Set
TerminalNo to 2 and RemoteTermNo to 1
•
LDCM for slot 303: Set
TerminalNo to 4 and RemoteTermNo to 3
The redundant channel is always configured in the lower position, for example
•
Slot 302: Main channel
•
Slot 303: Redundant channel
The same is applicable for slot 312-313 and slot 322-323.
DiffSync: Here the method of time synchronization, Echo or GPS, for the line differential
function is selected.
Using
Echo in this situation is safe only as long as there is no risk of varying
transmission asymmetry.
GPSSyncErr: If GPS synchronization is lost, the synchronization of the line differential function
will continue during 16 s. based on the stability in the local IED clocks. Thereafter the setting
Block will block the line differential function or the setting Echo will make it continue by using
the
Echo synchronization method. It shall be noticed that using Echo in this situation is only
safe as long as there is no risk of varying transmission asymmetry.
CommSync: This setting decides the Master or Slave relation in the communication system
and shall not be mistaken for the synchronization of line differential current samples. When
direct fibre is used, one LDCM is set as
Master and the other one as Slave. When a modem and
multiplexer is used, the IED is always set as
Slave, as the telecommunication system will
provide 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.
1MRK 505 343-UEN B
Section 20
Remote communication
709
Application manual
Summary of Contents for Relion 670 series
Page 1: ...RELION 670 SERIES Line differential protection RED670 Version 2 1 IEC Application manual...
Page 2: ......
Page 40: ...34...
Page 64: ...58...
Page 150: ...144...
Page 406: ...400...
Page 472: ...466...
Page 494: ...488...
Page 512: ...506...
Page 524: ...518...
Page 604: ...598...
Page 686: ...680...
Page 718: ...712...
Page 722: ...716...
Page 758: ...752...
Page 759: ...753...