ABB Relion 670 series - Page 916

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:
• 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 select more than one time source, in which case one is backup for the other.
The time synchronization source with the best calculated time-quality is automatically
selected. For instance, if both GPS and IRIG-B are selected and both sources have the
required accuracy, optical IRIG-B with IEEE1344 will be automatically selected as the
Section 24 1MRK 506 369-UUS -
Basic IED functions
910 Line distance protection REL670 2.2 ANSI
Application manual