SW time
Time
regulator
(fast or slow)
Time tagging and general synchronization
Time
regulator
(Setting:
see
Technical
manual)
Commu-
nication
Events
Synchronization for differential protection
(Echo mode)
Diff.
commu-
nication
*IEC 61850-9-2
IEC16000002-2-en.vsdx
External
synchronization
sources
Merging
units*
LON
SPA
SNTP
IRIG-B
PPS
Off
Min. pulse
DNP
IRIG-B
PPS
Off
Protection
and control
functions
A/D
converter
HW time
Off
On
PTP(IEEE 1588)
Slave only
IEC16000002 V2 EN-US
Figure 383:
Design of the time system (clock synchronization)
All time tagging is performed by the software clock. When, for example, a status
signal is changed in the protection system of a function based on the free running
hardware clock, the event is time tagged by the software clock when it reaches the
event recorder. The hardware clock can thus run independently.
The echo mode of the line differential protection function is based on the hardware
clock. Thus, there is no need to synchronize the hardware clock and the software
clock.
Synchronization of the hardware clock to the software clock is necessary only
when IRIG B 00X with optical fibre, IEEE 1344 is used for differential protection.
The two clock systems are synchronized by a special clock synchronization unit
with two modes, fast and slow. A special feature, an automatic fast clock time
regulator is used. The automatic fast mode makes the synchronization time as short
as possible during start-up. The
Fast
and
Slow
settings are also available on the
local HMI.
SyncLostMode
is not required to set as
Block
/
BlockonLostUTC
when differential
protection is based on ECHO mode.
Section 19
1MRK 506 382-UEN A
Basic IED functions
802
Line distance protection REL650 2.2 IEC
Technical manual
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