EMR-5000
IM02602012E
Commissioning: Overfrequency [ANSI 81O]
Object to be tested:
All configured overfrequency protection stages.
Necessary means:
Three-phase voltage source with variable frequency; and
Timer
Procedure:
Testing the threshold values
Keep on increasing the frequency until the respective frequency element is activated;
Note the frequency value; and
Disconnect the test voltage.
Testing the trip delay
Set the test voltage to nominal frequency and
Now connect a frequency jump (activation value) and then start a timer. Measure the tripping time at the relay
output.
Testing the fallback ratio:
Reduce the measuring quantity to less than 99.95% of the trip value (or 0.05% fn). The relay must only fall back at
99.95% of the trip value at the earliest (or 0.05% fn).
Successful test result:
Permissible deviations/tolerances can be taken from the Technical Data.
Commissioning: Underfrequency [ANSI 81U]
For all configured underfrequency elements, this test can be carried out similar to the test for overfrequency protection
(by using the related underfrequency values).
Please consider the following deviations:
For testing the threshold values, the frequency has to be decreased until the protection element is activated.
For detection of the fallback ratio, the measuring quantity has to be increased to more than 100.05% of the trip
value (or 0.05% fn). At 100.05% of the trip value the relay is to fall back at the earliest (or 0.05% fn).
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