Introduction
12
7SS52 V4 Manual
C53000-G1176-C182-3
Event buffer in cen-
tral unit
The SIPROTEC 7SS52 V4 distributed busbar and circuit breaker failure protection
supplies battery-buffered data for the analysis of faults as well as for operational
events.
Up to 200 operational events and 80 fault events with real-time information are stored
in a circulating buffer in the central unit.
Operational events include switching operations, protection status indications, isolator
status irregularities and monitoring functions.
Fault events include trip signals in the event of busbar short-circuits, circuit-breaker
failure and transfer trip.
Event buffer in
bay unit
Up to 50 operational events and 100 fault events per fault.
Self
monitoring
Hardware and software are continuously monitored; irregularities are recognized in-
stantly and annunciated.
A high degree of security and availability is achieved by the continuous monitoring of:
• Isolator statuses
• Trip circuits
• Measured current circuits
• Measured value transformations
• Supply voltages
• Program memories
• Program processing
• Discharge degree of battery (central unit and bay unit)
For diagnosis purposes in the event of device failures, a battery-buffered dedicated
data memory is available in the central unit.
Clock control • Central unit
− Battery-buffered time with 1 ms resolution
− Time set by entry of current data
− Synchronization of the central unit via binary input or system port (synchroniza-
tion signal DCF77, IRIG B by satellite receiver)
− IEC 60870-5-103 and IEC 61850
• Bay unit
− Battery-buffered time with 1 ms resolution
− Clock synchronization by central unit in intervals of 1 minute
− Local clock setting possible as well
Battery-buffered
functions
The central unit and the bay units are equipped with buffer batteries to ensure that
LED states, date and time, operational and fault events as well as fault records are
maintained in case of an auxiliary power failure.
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