Section 23 Security
23.1 Authority status ATHSTAT
23.1.1 Application
Authority status (ATHSTAT) function is an indication function block, which informs
about two events related to the IED and the user authorization:
• the fact that at least one user has tried to log on wrongly into the IED and it was
blocked (the output USRBLKED)
• the fact that at least one user is logged on (the output LOGGEDON)
The two outputs of ATHSTAT function can be used in the configuration for different
indication and alarming reasons, or can be sent to the station control for the same purpose.
23.2 Self supervision with internal event list INTERRSIG
23.2.1 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
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:
1MRK 506 369-UUS - Section 23
Security
Line distance protection REL670 2.2 ANSI 891
Application manual
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