Eaton EDR-5000 Nstallation, Operation And Maintenance Manual page 693

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Commissioning: 81R Rate of Change (df/dt)

Object to be tested:

All frequency protection stages that are projected as df/dt.

Necessary means:

Three-phase voltage source and

Frequency generator that can generate and measure a linear, defined rate of change of frequency.

Testing the threshold values

Keep on increasing the rate of change of frequency until the respective element is activated and

Note the value.

Testing the trip delay

Set the test voltage to nominal frequency:

Now apply a step change (sudden change) that is 1.5 times the setting value (example: apply 3 Hz per second if

the setting value is 2 Hz per second); and

Measure the tripping time at the relay output. Compare the measured tripping time to the configured tripping

Successful test result:

Permissible deviations/tolerances and dropout ratios can be taken from the Technical Data.

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