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294
LED indication function (HL, HLED)
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The LED indication module is an additional feature for the REx 500 terminals for pro-
tection and control and consists totally of 18 LEDs (Light Emitting Diodes). It is located
on the front of the protection and control terminal. The main purpose is, to present on
site an immediate visual information on:
•
actual signals active (or not active) within the protected bay (terminal).
•
alarm signals handled as a simplified alarm system.
•
last operation of the terminal. Here we understand the presentation of the signals ap-
peared during the latest start(s) or trip(s) since the previous information has been
reset.
The user of this information is the technician in substation or the protection engineer
during the testing activities. The protection engineer can also be able to read the status
of all LEDs over the SMS in his office as well as to acknowledge/reset them locally or
remotely.
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Each LED indication can be set individually to operate in six different sequences; two
as follow type and four as latch type. Two of the latching types are intended to be used
as a protection indication system, either in collecting or re-starting mode, with reset
functionality. The other two are intended to be used as a signaling system in collecting
mode with an acknowledgment functionality.
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Each LED can show green, yellow or red light, each with its own activation input. If
more than one input is activated at the time a priority is used with green as lowest pri-
ority and red as the highest.
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LEDs which are used in collecting mode of operation are accumulated continuously un-
til the unit is acknowledged manually. This mode is suitable when the LEDs are used
as a simplified alarm system.
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