ABB RED650, Applications Manual

Page: 440 / 454

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).
22.6 IEC/UCA 61850-9-2LE Merging unit requirements
SEMOD166590-11 v5
The merging units that supply the IED with measured values via the process bus
must fulfill the IEC/UCA 61850-9-2LE standard.
This part of the IEC 61850 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 IEC 61850 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 (IEC/UCA 61850-9-2LE) is a subset of the IEC
61850-9-2. 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.
Section 22
1MRK 505 393-UEN B
Requirements
434 Line differential protection RED650 2.2 IEC
Application manual