EMR-5000
IM02602012E
Commissioning: Aux. Overvoltage
Object to be tested:
Aux. Overvoltage 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 voltage has to be increased
until the relay is activated. When comparing the displayed values with those of the voltmeter, the deviation must be wi-
thin 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 exceeded and it is stopped when the relay trips.
Testing the dropout ratio
Reduce the measuring quantity to less than 97% of the trip value. The relay must only dropout at a minimum of 97% 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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