Synchronization via Built-in-GPS
The built-in GPS clock modules receive and decode time information from the global
positioning system. The modules are located on the GPS time synchronization
Module (GTM).
Synchronization via binary input
The IED accepts minute pulses to a binary input. These minute pulses can be
generated from, for example station master clock. If the station master clock is not
synchronized from a world wide source, time will be a relative time valid for the
substation. Both positive and negative edge on the signal can be accepted. This signal
is also considered as a fine time synchronization signal.
The minute pulse is connected to any channel on any Binary Input Module in the IED.
The electrical characteristic is thereby the same as for any other binary input.
If the objective of synchronization is to achieve a relative time within the substation
and if no station master clock with minute pulse output is available, a simple minute
pulse generator can be designed and used for synchronization of the IEDs. The minute
pulse generator can be created using the logical elements and timers available in the
IED.
The definition of a minute pulse is that it occurs one minute after the last pulse. As only
the flanks are detected, the flank of the minute pulse shall occur one minute after the
last flank.
Binary minute pulses are checked with reference to frequency.
Pulse data:
• Period time (a) should be 60 seconds.
• Pulse length (b):
• Minimum pulse length should be >50 ms.
• Maximum pulse length is optional.
• Amplitude (c) - please refer to section
"Binary input module (BIM)".
Deviations in the period time (a) larger than 50 ms will cause TSYNCERR.
1MRK502052-UEN B Section 20
Basic IED functions
1113
Technical manual
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