ABB Relion 670 Series Technical Reference Manual page 70

Busbar protection

Hide thumbs Also See for Relion 670 Series:

Table of Contents

Basic IED functions

Synchronization

IEC08000287 V2 EN

Design of time system (clock synchronization)

All time tagging is performed by the software clock. When for example a status

signal is changed in the protection system with the function based on free running

hardware clock, the event is time tagged by the software clock when it reaches the

event recorder. Thus the hardware clock can run independently.

The echo mode for the differential protection is based on the hardware clock. Thus,

there is no need to synchronize the hardware clock and the software clock.

The synchronization of the hardware clock and the software clock is necessary only

when GPS or IRIG B 00X with optical fibre, IEEE 1344 is used for differential

protection. The two clock systems are synchronized by a special clock

synchronization unit with two modes, fast and slow. A special feature, an

automatic fast clock time regulator is used. The automatic fast mode makes the

synchronization time as short as possible during start-up or at interruptions/

disturbances in the GPS timing. The setting fast or slow is also available on the

If a GPS clock is used for other 670 series IEDs than line differential RED670, the

hardware and software clocks are not synchronized

Time tagging and general synchronisation

Connected when GPS-time is

used for differential protection

(fast or slow)

1MRK 505 208-UEN B

Synchronization for differential protection

(ECHO-mode or GPS)

*IEC 61850-9-2

IEC08000287-2-en.vsd

Technical reference manual

Show Quick Links

Table of Contents