5. Increase the measured voltage to rated load conditions.6. Check that the PICKUP signal resets.7. Instantaneously decrease the voltage in one phase to a value about 20% lowerthan the measured trip value.8. Measure the time delay for the TRIP signal, and compare it with the set value.9. Check the inverse time delay by injecting a voltage corresponding to 0.8 ×Vpickup<.For example, if the inverse time curve A is selected, the tripsignals TRST1 and TRIP trip after a time corresponding to theequation:( ) 11TDt s VVpickup= æ ö-ç ÷<è øANSIEQUATION2428 V1 EN-US (Equation 96)where:t(s) Trip time in secondsTD1 Settable time multiplier of the function for step 1V Measured voltageVpickup< Set pickup voltage for step 1For example, if the measured voltage jumps from the rated value to 0.8 times theset pickup voltage level and time multiplier TD1 is set to 0.05 s (default value),then the TRST1 and TRIP signals trip at a time equal to 0.250 s ± tolerance.10. The test above can be repeated to check the inverse time characteristic at differentvoltage levels.11. Repeat the above described steps for Step 2 of the function.Extended testing M13796-35 v8The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.13.6.1.2 Completing the test M13796-25 v5Continue to test another function or end the test by changing the TESTMODE setting toDisabled. Restore connections and settings to their original values, if they werechanged for testing purposes.Section 13 1MRK 502 073-UUS ATesting functionality by secondary injection220 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062Commissioning manual
