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Time-out on synchronization sources
M11346-96 v3
All synchronization interfaces have a time-out, and a configured interface must
receive time synchronization messages regularly in order not to give an error signal
(TSYNCERR) that is reported from the INTERRSIG function block. The time-out
is such that one message can be lost without getting a TSYNCERR, but if more
than one message is lost, a TSYNCERR is given.
19.1.3.3
Synchronization alternatives
M11346-3 v7
Three main alternatives of external synchronization sources are available. The
synchronization message is applied:
•
via any of the communication ports of the IED as a telegram message
including date and time
•
as a minute pulse connected to a binary input
•
via IRIG-B or PPS
Synchronization via SNTP
M11346-33 v7
SNTP provides a ping-pong method of synchronization. A message is sent from an
IED to an SNTP server, and the SNTP server returns the message after filling in a
reception time and a transmission time. SNTP operates via the normal Ethernet
network that connects IEDs together in an IEC 61850 network. For SNTP to
operate properly, there must be an SNTP server present, preferably in the same
station. The SNTP synchronization provides an accuracy that gives +/- 1 ms
accuracy for binary inputs. The IED itself can be set as an SNTP-time server.
SNTP provides complete time-information and can be used as both fine and coarse
time synch source. However SNTP shall normally be used as fine synch only.
SNTP server requirements
GUID-588FCD12-C494-445E-8488-8287B34EFD9A v4
The SNTP server to be used is connected to the local network, that is not more than
4-5 switches or routers away from the IED. The SNTP server is dedicated for its
task, or at least equipped with a real-time operating system, that is not a PC with
SNTP server software. The SNTP server should be stable, that is, either
synchronized from a stable source like GPS, or local without synchronization.
Using a local SNTP server without synchronization as primary or secondary server
in a redundant configuration is not recommended.
Synchronization via serial communication module (SLM)
M11346-50 v7
On the serial buses (both LON and SPA) two types of synchronization messages
are sent.
•
Coarse message is sent every minute and comprises complete date and time,
that is, year, month, day, hours, minutes, seconds and milliseconds.
•
Fine message is sent every second and comprises only seconds and
milliseconds.
The SLM module is located on the first analog digital conversion module (ADM)
1MRK 506 382-UEN A
Section 19
Basic IED functions
Line distance protection REL650 2.2 IEC
805
Technical manual
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