Hitachi Relion 670 Series Applications Manual page 396
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Also See for Relion 670 Series:
- Applications manual (354 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
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Section 19
Remote communication
OutOfService
TerminalNo is used to assign a unique address to each LDCM in all current differential IEDs. Up to
256 LDCMs can be assigned a unique number. For example, in a local IED with two LDCMs:
•
LDCM for slot 305: set TerminalNo to 1 and RemoteTermNo to 2
•
LDCM for slot 306: set TerminalNo to 3 and RemoteTermNo to 4
In multiterminal current differential applications,with 4 LDCMs in each IED, up to 20 unique
addresses must be set.
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
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 Block blocks the
line differential function or setting Echo keeps it on by using the Echo synchronization 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 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 HighPower.
Long-range LDCM: Typical distance 120 km for 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.
390
IED informs the remote end that it is out of service
A unique address is necessary to give high security against incorrect addressing in the
communication system. If the same number is used for TerminalNo in some of the
LDCMs, a loop-back test in the communication system can give an incorrect trip.
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.
Using Echo in this case is safe only if there is no risk of varying transmission asymmetry.
Using Echo in this case is safe only if there is no risk of varying transmission asymmetry.
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