DOC. MIE91093 Rev. 1.34 Page 37 of 145
. Set the “Automatic save at trip” function, as follows.
Test control > Save > Confirm at trip > ESC
1.4.3. P% Threshold and drop-off
. The first session is finding P%.
. Set the current to voltage angle at 180°.
. Select ON; slowly increase the current. As the relay trips,
pressing the multi-function knob tripping values can be saved.
The TRIP LED (43) turns on for 5 seconds; during 5 seconds,
parameters at trip are displayed; then, the standard
measurement is restored. Confirm save results pressing the
multi-function knob, and proceed: the display shows the
corresponding single-phase power.
NOTE: If the relay is three-phase, power should be multiplied
by 3. This can easily be done after transferring test results to
X-PRO1000.
. Next, we find the drop-off threshold for P%. From the trip
current above, slowly decrease the current; as the relay
resets, save test result.
NOTE: stored value is the current as the relay resets; as reset
timing is usually very short, current does not change very
much at drop-off, and the measurement is accurate.
1.4.4. Threshold and drop-off of other points
. Next sessions serve to find P1, P2 threshold and drop-off.
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