ABB Relion RES670, Technical Manual

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the TZ Offset supplied in the message equals UTC at all times. For RES670, optical
IRIG-B 00x with IEEE1344 support is recommended.
Redundant time synchronization via both GPS and IRIG-B
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In order to improve the time reliability of the PMU, time synchronization redundancy
is provided in RES670. In this case, both built-in GPS and IRIG-B modules shall be
used and the
FineSynchSource parameter shall be set as GPS+IRIG-B . The time
synchronization source with the best calculated time-quality is automatically selected.
If both GPS and IRIG-B sources have the required accuracy, optical IRIG-B with
IEEE1344 will be automatically selected as the time synchronization source.
22.1.3.4 Process bus IEC/UCA 61850-9-2LE synchronization
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When process bus communication (IEC/UCA 61850-9-2LE protocol) is used, it is
essential that the merging units are synchronized with the hardware time of the IED
(see Technical manual, section
Design of the time system (clock synchronization ) ). To
achieve this, PTP, PPS or IRIG-B can be used depending of the facilities of the
merging unit.
If the merging unit supports PTP, use PTP. If PTP is used in the IED and the merging
unit is not PTP capable, then synchronize the merging unit from the IED via a PPS out
from the GTM. If PTP is used in the IED and the merging unit cannot be synchronized
from the IED, then use GPS-based clocks to provide PTP synch as well as sync to the
merging unit.
If synchronization of the IED and the merging unit is based on GPS, set the parameter
LostSyncMode to BlockOnLostUTC in order to provide a block of protection functions
whenever the global common time is lost.
If PTP is not used, use the same synchronization method for the HwSyncSrc as the
merging unit provides. For instance, if the merging unit provides PPS as
synchronization, use PPS as
HwSyncSrc . If either PMU or LDCM in GPS-mode is
used, that is, the hardware and software clocks are connected to each other, HwSyncSrc
is not used and other means to synchronize the merging unit to the IED is required.
Either
FineSyncSource is set to the same source that the merging unit uses, or the PPS
output from the GTM module is used to synchronize the merging unit. If the PPS
output from the GTM module is used to synchronize the merging unit and PTP is not
used, the IED does not know how the merging unit is synchronized and the parameter
LostSyncMode must be set to NoBlock .
22.1.3.5 Precision Time Protocol (PTP)
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PTP according to IEEE 1588-2008 and specifically its profile IEC/IEEE 61850-9-3 for
power utility automation is a synchronization method that differs from SNTP, for
instance, by providing much better accuracy and by being not predefined. By not
1MRK 511 408-UUS A
Section 22
Basic IED functions
Phasor measurement unit RES670 2.2 ANSI 771
Technical manual