ABB Relion 670 Series Applications Manual page 517
Bay control, version 2.1 ansi
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Also See for Relion 670 Series:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (944 pages)
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1MRK 511 358-UUS A
The G.703 E1, 2 Mbit shall be set according to ITU-T G.803, G.810-13
•
One master clock for the actual network
•
The actual port Synchronized to the SDH system clock at 2048 kbit
•
Synchronization; bit synchronized, synchronized mapping
•
Maximum clock deviation <±50 ppm nominal, <±100 ppm operational
•
Jitter and Wander according to ITU-T G.823 and G.825
•
Buffer memory <250 μs, <100 μs asymmetric difference
•
Format.G 704 frame, structured etc.Format.
•
No CRC-check
Synchronization in PDH systems connected to SDH systems
•
Independent synchronization, asynchronous mapping
•
The actual SDH port must be set to allow transmission of the master clock from the PDH-
system via the SDH-system in transparent mode.
•
Maximum clock deviation <±50 ppm nominal, <±100 ppm operational
•
Jitter and Wander according to ITU-T G.823 and G.825
•
Buffer memory <100 μs
•
Format: Transparent
•
Maximum channel delay
•
Loop time <40 ms continuous (2 x 20 ms)
IED with echo synchronization of differential clock (without GPS clock)
•
Both channels must have the same route with maximum asymmetry of 0,2-0,5 ms, depending
on set sensitivity of the differential protection.
•
A fixed asymmetry can be compensated (setting of asymmetric delay in built in HMI or the
parameter setting tool PST).
IED with GPS clock
•
Independent of asymmetry.
22.5
IEC 61850-9-2LE Merging unit requirements
The merging units that supply the IED with measured values via the process bus must fulfill the
IEC61850-9-2LE standard.
This part of the IEC61850 is specifying "Communication Service Mapping (SCSM) – Sampled values
over ISO/IEC 8802", in other words – sampled data over Ethernet. The 9-2 part of the IEC61850
protocol uses also definitions from 7-2, "Basic communication structure for substation and feeder
equipment – Abstract communication service interface (ACSI)". The set of functionality
implemented in the IED (IEC61850-9-2LE) is a subset of the IEC61850-9-2. For example the IED
covers the client part of the standard, not the server part.
The standard does not define the sample rate for data, but in the UCA users group
recommendations there are indicated sample rates that are adopted, by consensus, in the
industry.
Application manual
Section 22
Requirements
SEMOD166590-11 v4
511
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