Hitachi Relion 670 Series Applications Manual page 413

1MRK506375-UEN Rev. N
Setting example
Station bus
Process bus
IEC16000167 V1 EN-US
Figure 201:
Figure 201
SAM600, and gets its synch from the GPS. Moreover, the REL and REC both acts as a boundary
clock to provide synch to the SAM600. The REL contains a GTM card, which has a PPS output that
is used to synchronize merging units that are not PTP compliant. As a side effect, the GTM contains
a GPS receiver and the REL acts as a backup of the GPS on the station bus.
On all access points, the PTP parameter is "ON".
On the REL, the parameter FineSyncSource (under Configuration/Time/Synchronization/
TIMESYNCHGEN:1/General) is set to "GPS" if there is a GPS antenna attached.
If the GTM is used as a PPS output only, the FineSynchSource is not set.
21.11.2.3 Process bus IEC/UCA 61850-9-2LE synchronization
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
SyncLostMode 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
Railway application RER670
Application manual
GPS
PTP
PTP PTP
REC REL GTM
PTP 9-2
9-2 PTP 9-2
9-2 9-2
SAM600-TS
SAM600-CT
SAM600-VT
IEC16000167-1-en.vsdx
Example system
describes an example system. The REC and REL are both using the 9-2 stream from the
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PPS
MU
Section 21
Basic IED functions
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