Process Bus Iec 61850-9-2Le Synchronization - ABB RELION 670 Series Applications Manual

Section 21
Basic IED functions
SyncAccLevel : This parameter is to define the required time synchronization accuracy for process
bus applications. The options are "Class T5 (1µs)", "Class T4 (4µs)", or "Unspecified". If it is set to
"Unspecified", the time quality will be always accepted and application functions will not be
blocked due to the time quality.
IRIG-B
The IRIG-B parameters have to be set according to the external clock providing the IRIG-B signal to
the IED. The IRIG-B parameters (IRIG-B:1) are as follows:
SynchType
•
TimeDomain
•
Encoding
•
TimeZoneAs1344
•
SynchType : This parameter is used to select the type of IRIG-B synchronization. The options are
"BNC" or "Opto". The IRIG-B module has two inputs. One input is for the electrical IRIG-B (BNC
connector) that can handle both a pulse-width modulated signal (also called unmodulated) and an
amplitude modulated signal (also called sine wave modulated). The other is an optical input type
ST for optical pulse-width modulated signal (IRIG-B 00X). The recommended IRIG-B signal for PMU
time synchronization is IRIG-B optical (IRIG-B 00X) with IEEE1344 support. If the optical IRIG-B
signal is used, this parameter shall be set as "Opto", and If electrical IRIG-B signal is used (not
recommended) this shall be set as "BNC". More information regarding IRIG-B module is available in
Technical Manual under section IED Hardware.
TimeDomain : This parameter shall be also set according to the external clock used. The options
are "LocalTime" or "UTC".
Encoding : This parameter shall be set according to the type of encoding on the IRIG-B signal
provided by the external clock. The options are "IRIG-B", "1344", or "1344TZ". The IRIG-B signal used
for synchrophasor application has to support IEEE 1344. IEEE 1344 can provide Time Zone offset
(TZ) as an additional information. Encoded IRIG-B time plus TZ (Time Zone) offset always equals
to UTC.
TimeZoneAs1344 : This parameter is used to specify the sign of Time Zone (TZ) offset as defined in
IEEE 1344 and according to the external clock. The options are "Plus TZ" or "Minus TZ". Encoded
IRIG-B time plus Time Zone offset always equals to UTC.
21.13.2.3

Process bus IEC 61850-9-2LE synchronization

When process bus communication (IEC 61850-9-2LE protocol) is used, it is essential that the
merging units are using the same time source as the IED. To achieve this, a satellite-controlled
clock shall provide time synchronization to the IED (either internal GPS or via IRIG-B 00x with
IEEE1344 support) and to the merging units (via for instance PPS). For the time synchronization of
the process bus communication, GPS Time Module (GTM) and/or IRIG-B module can be used. If the
IED contains a GTM, the merging unit can be synchronized from the PPS output of the GTM.
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1MRK 511 364-UUS A
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