9.5.3.1 Verifying the settings SEMOD54358-35 v111. Apply a single-phase voltage either to a single-phase voltage input or to aresidual voltage input with the start value below the set value U1>.2. Slowly increase the value until ST1 appears.3. Note the operate value and compare it with the set value.4. Decrease the voltage slowly and note the reset value.5. Set and apply a 20% higher voltage than the measured operate value for onephase.6. Measure the time delay for the TR1 signal and compare it with the set value.7. Check the inverse time delay by injecting a voltage corresponding to 1.2 ×U1>.For example, if the inverse time curve A is selected, the tripsignals TR1 and TRIP operate after a time corresponding tothe equation:t s kUU( ) => − 11 1IECEQUATION2429 V1 EN-US (Equation 90)where:t(s) Operate time in secondsk1 Settable time multiplier of the function for step 1U Measured voltageU1> Set start voltage for step 18. Repeat the test for Step 2 of the function.9.5.3.2 Completing the test SEMOD54358-38 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.9.6 Frequency protection SEMOD53547-1 v19.6.1 Underfrequency protection SAPTUF M16289-2 v7Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".9.6.1.1 Verifying the settings M16289-15 v3Section 9 1MRK 506 383-UEN ATesting functionality by secondary injection126 Line distance protection REL650 2.2 IECCommissioning manual
