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2.1.2
Device
The device requires some general information. This may be, for example, the type of indication to be issued in
the event a power system fault occurs.
2.1.2.1 Trip-Dependent Indications
The storing of indications masked to local LEDs, and the maintenance of spontaneous indications, can be
made dependent on whether the device has issued a trip signal. This information is then not output if one or
more protection functions have picked up during a system disturbance, but no tripping by the 7VK61 resulted
because the fault was cleared by a different device (e.g. on another line). These indications are then limited to
faults on the line to be protected.
The figure below illustrates the generation of the reset command for stored indications. When the relay drops
off, stationary conditions (fault display on every pickup/on trip only; trip/no trip) decide whether the new fault
will be stored or reset.
Figure 2-1
2.1.2.2 Setting Notes
Fault Annunciations
Pickup of a new protective function generally turns off any previously lit LEDs, so that only the latest fault is
displayed at any time. It can be selected whether the stored LED displays and the spontaneous indications on
the display appear upon renewed pickup, or only after a renewed trip signal is issued. In order to enter the
desired type of display, select the submenu Device in the SETTINGS menu. At address 610
FltDisp.LED/LCD the two alternatives Target on PU and Target on TRIP („No trip - no flag") are of-
fered.
At address 625 T MIN LED HOLD you can specify a delay time (e.g. ) during which the LEDs will not be reset.
After this delay time has elapsed, the LEDs can be reset. All present information items are OR-combined.
After startup of the device featuring a 4-line display, measured values are displayed by default. Use the arrow
keys on the device front to select the different representations of the measured values for the so called default
display. The start page of the default display, which is displayed by default after startup of the device, can be
selected via parameter 640 Start image DD. The available representation types for the measured value are
listed in the appendix .
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Creation of the reset command for the latched LED and LCD messages
Functions
2.1 General
27
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