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Self supervision (INT)
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The REx 5xx protection and control terminals have a complex design with many includ-
ed functions. The included self-supervision function and the INTernal signals function
block provide good supervision of the terminal. The different safety measures and fault
signals makes it easier to analyze and locate a fault.
Both hardware and software supervision is included and it is also possible to indicate
possible faults through a hardware contact on the PSM and/or through the software
communication.
Internal events are generated by the built-in supervisory functions. The supervisory
functions supervise the status of the various modules in the terminal and, in case of fail-
ure, a corresponding event is generated. Similarly, when the failure is corrected, a cor-
responding event is generated.
Apart from the built-in supervision of the various modules, events are also generated
when the status changes for the:
•
built-in real time clock (in operation/out of order).
•
external time synchronization (in operation/out of order).
Events are also generated:
•
whenever any setting in the terminal is changed.
•
when the content of the Disturbance report is erased.
The internal events are time tagged with a resolution of 1 ms and stored in a list. The
list can store up to 40 events. The list is based on the FIFO principle, that is, when it is
full, the oldest event is overwritten. The list cannot be cleared and its content cannot be
modified.
The list of internal events provides valuable information, which can be used during
commissioning and fault tracing.
The information can only be retrieved with the aid of the SMS. The PC can be connect-
ed either to the port at the front or at the rear of the terminal.
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