Time Synchronization Timesynchgen; Application - ABB REB670 Applications Manual

Section 20
Basic IED functions
20.13
20.13.1
518

Time synchronization TIMESYNCHGEN

Application

Use time synchronization to achieve a common time base for the IEDs in a protection
and control system. This makes it possible to compare events and disturbance data
between all IEDs in the system. If a global common source (i.e. GPS) is used in
different substations for the time synchronization, also comparisons and analysis
between recordings made at different locations can be easily performed and a more
accurate view of the actual sequence of events can be obtained.
Time-tagging of internal events and disturbances are an excellent help when evaluating
faults. Without time synchronization, only the events within one IED can be compared
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
• IEEE 1588 (PTP)
For IEDs using IEC/UCA 61850-9-2LE 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 PTP, optical PPS or IRIG-B. For
IEDs using IEC/UCA 61850-9-2LE from one single MU as analog data source, the
MU and IED still need to be synchronized to each other. This could be done by letting
the MU supply a PPS signal to the IED or by supplying a PPS signal from the IED to
the MU, by using a GTM.
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.
1MRK 505 370-UUS A
M11345-3 v10
Busbar protection REB670 2.2 ANSI
Application manual
IP1750-1 v2