Setting Guidelines - ABB REB670 Applications Manual

1MRK 505 337-UUS -
18.16.2
18.16.2.1
Application manual
with each other. With time synchronization, events and disturbances within the whole
network, can be compared and evaluated.
In the IED, the internal time can be synchronized from the following sources:
• BIN (Binary Minute Pulse)
• DNP
• GPS
• IEC103
• SNTP
• IRIG-B
• SPA
• LON
• PPS
For IEDs using IEC61850-9-2LE in "mixed mode" a time synchronization from an
external clock is recommended to the IED and all connected merging units. The time
synchronization from the clock to the IED can be either optical PPS or IRIG-B. For IED's
using IEC61850-9-2LE from one single MU as analog data source, the MU and IED still
needs to be synchronized to each other. This could be done by letting the MU supply a PPS
signal to the IED.
Out of these, LON and SPA contains two types of synchronization messages:
• Coarse time messages are sent every minute and contain complete date and time, that
is year, month, day, hour, minute, second and millisecond.
• Fine time messages are sent every second and comprise only seconds and
milliseconds.
The selection of the time source is done via the corresponding setting.
It is possible to set a backup time-source for GPS signal, for instance SNTP. In this case,
when the GPS signal quality is bad, the IED will automatically choose SNTP as the time-
source. At a given point in time, only one time-source will be used.

Setting guidelines

All the parameters related to time are divided into two categories: System time and
Synchronization.
System time
The time is set with years, month, day, hour, minute, second and millisecond.
Section 18
Basic IED functions
479