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24
Time synchronisation (TIME)
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Use time synchronisation to achieve a common time base for the terminals in a protec-
tion and control system. This makes comparision of events and disturbance data be-
tween all terminals in the system possible.
Time-tagging of internal events and disturbances is an excellent help when evaluating
faults. Without time synchronisation, only the events within the terminal can be com-
pared to one another. With time synchronisation, events and disturbances within the en-
tire station, and even between line ends, can be compared during an evaluation.
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Two main alternatives of external time synchronisation are available. Either the syn-
chronisation message is applied via any of the communication ports of the terminal as
a telegram message including date and time, or as a minute pulse, connected to a binary
input. The minute pulse is used to fine tune already existing time in the terminals.
The REx 5xx terminal has its own internal clock with date, hour, minute, second and
millisecond. It has a resolution of 1 ms.
The clock has a built-in calendar that handles leap years through 2098. Any change be-
tween summer and winter time must be handled manually or through external time syn-
chronisation. The clock is powered by a capacitor, to bridge interruptions in power
supply without malfunction.
The internal clock is used for time-tagging disturbances, events in Substation monitor-
ing system (SMS) and Substation control system (SCS), and internal events.
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The time is set with year, month, day and time. Refer to the ,QVWDOODWLRQ DQG FRPPLV
VLRQLQJ PDQXDO for information on the setting procedure.
When the source of time synchronization is selected on the local HMI, the parameter is
called TimeSyncSource. The time synchronisation source can also be set from the CAP
tool. The setting parameter is then called SYNCSCR. The setting alternatives are:
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None (no synchronisation)
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