During disturbed conditions, the trip security function in can cope with high bit error rates up
to 10
-5
or even up to 10
-4
. The trip security can be configured to be independent of COMFAIL
from the differential protection communication supervision, or blocked when COMFAIL is
issued after receive error >100ms. (Default).
Synchronization in SDH systems with G.703 E1 or IEEE C37.94
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.
23.5
IEC 61850-9-2LE Merging unit requirements
SEMOD166590-11 v4
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.
1MRK 505 343-UEN B
Section 23
Requirements
743
Application manual
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