EMR-4000
IM02602009E
Commissioning: Aux. Undervoltage
Object to be tested:
Aux. undervoltage protection elements.
Necessary components:
One-phase AC voltage source;
Timer for measuring of the tripping time; and
Voltmeter.
Procedure
(for each element):
Testing the threshold values
For testing the threshold
and dropout values, the test vol
tage at the measuring input for the residual voltage has to be
decreased until the relay is activated. When comparing the displayed values with those of the voltmeter, the deviation
must be within the permissible tolerances.
Testing the trip delay
For testing the trip delay, a timer is to be connected to the contact of the associated trip relay. The timer is started
when the limiting value of the tripping voltage is reached and it is stopped when the relay trips.
Testing the dropout ratio
Increase the measuring quantity to more than 103% of the trip value. The relay must only dropout at a maximum of
103% of the trip value.
Successful test result
The measured threshold values, trip delays, and dropout ratios comply with those specified in the adjustment list.
Permissible deviations/tolerances can be taken from the Technical Data.
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