Verification of START value and time delay to operate M16256-10 v51. Check that the settings in the IED are appropriate, especially the STARTvalue and the definite time delay. Set StartFreqGrad, to a rather smallnegative value.2. Supply the IED with three-phase voltages at their rated values.3. Slowly decrease the frequency of the applied voltage, with an increasing rate-of-change that finally exceeds the setting of StartFreqGrad, and check thatthe START signal appears.4. Note the operate value and compare it with the set value.5. Increase the frequency to rated operating conditions, and zero rate-of-change.6. Check that the START signal resets.7. Instantaneously decrease the frequency of the applied voltage to a value about20% lower than the nominal value.8. Measure the time delay for the TRIP signal, and compare it with the set value.Extended testing M16256-29 v41. The test above can be repeated to check a positive setting of StartFreqGrad.2. The tests above can be repeated to check the time to reset.3. The tests above can be repeated to test the RESTORE signal, when thefrequency recovers from a low value.11.7.3.2 Completing the test M16256-39 v4Continue to test another function or end the test by changing the TESTMODEsetting to Off. Restore connections and settings to their original values, if they werechanged for testing purposes.11.8 Multipurpose protection SEMOD53552-1 v111.8.1 General current and voltage protection CVGAPC SEMOD56488-3 v3Prepare the IED for verification of settings as outlined in section "Requirements"and section "Preparing for test" in this chapter.One of the new facilities within the general current and voltage protection functionCVGAPC is that the value, which is processed and used for evaluation in thefunction, can be chosen in many different ways by the setting parametersCurrentInput and VoltageInput.These setting parameters decide what kind of preprocessing the connected three-phase CT and VT inputs shall be subjected to. That is, for example, single-phasequantities, phase-to-phase quantities, positive sequence quantities, negativesequence quantities, maximum quantity from the three-phase group, minimum1MRK 505 378-UEN A Section 11Testing functionality by secondary injectionLine differential protection RED670 2.2 IEC 211Commissioning manual