Hitachi Relion 670 Series Applications Manual page 401

1MRK506375-UEN Rev. N
Section 20
20.1 Authority status ATHSTAT
20.1.1 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.
20.2 Self supervision with internal event list INTERRSIG
20.2.1 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:
• 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, in addition to be viewed on the built in HMI, also be retrieved with the aid of a
PC with PCM600 installed and by using the Event Monitoring Tool. The PC can either be connected
to the front port, or to the port at the back of the IED.
20.3 Change lock CHNGLCK
Railway application RER670
Application manual
Security
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Section 20
Security
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