3.4 Basic IED functions
3.4.1 Self supervision with internal event list
3.4.1.1 Application
The protection and control IEDs have many functions included . The included self-
supervision with internal event list function block provides good supervision of the
IED. The fault signals make 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 power supply module 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 IED and, in case of failure,
a corresponding event is generated. Similarly, when the failure is corrected, a
corresponding 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 IED is changed.
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 contents cannot be modified, but the whole
list can be cleared using the Reset menu in the LHMI.
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 PCM600 Event Monitoring Tool.
The PC can either be connected to the front port, or to the port at the back of the IED.
3.4.1.2 Setting parameters
The function does not have any parameters available in the local HMI or PCM600.
Section 3 1MRK504116-UUS C
IED application
74
Application manual
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