ABB RELION 670 Series Applications Manual page 435
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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 505 337-UUS A
20.4
Sample specification of communication requirements for
the protection and control terminals in digital
telecommunication networks
The communication requirements are based on echo timing.
Bit Error Rate (BER) according to ITU-T G.821, G.826 and G.828
•
<10
Bit Error Rate (BER) for high availability of the differential protection
•
<10
•
<10
During disturbed conditions, the trip security function in can cope with high bit error rates up to
-5
10
or even up to 10
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).
Application manual
-6
according to the standard for data and voice transfer
-8
-9
-10
during normal operation
-6
during disturbed operation
-4
. The trip security can be configured to be independent of COMFAIL from the
Section 20
Requirements
GUID-0A9F36AF-3802-42FE-8970-4662798C19D1 v1
429
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