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Section 23
Basic IED functions
23.13
23.13.1
788
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 PMU functionality, only PTP, GPS or IRIG-B or a combination of both
GPS and IRIG-B is allowed.
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:
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
1MRK 502 071-UUS A
IP1750-1 v2
M11345-3 v10
Application manual
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