Testing the frequency differenceThe frequency difference test should verify that operation is achieved when theFreqDiffA and FreqDiffM frequency difference is lower than the set value for manualand auto synchronizing check, FreqDiffA and FreqDiffM respectively and thatoperation is blocked when the frequency difference is greater.Test with frequency difference = 0 mHzTest with a frequency difference outside the set limits for manual and autosynchronizing check respectively.1. Apply voltages U-Line equal to 100% GblBaseSelLine and U-Bus equal to100% GblBaseSelBus, with a frequency difference equal to 0 mHz and a phasedifference lower than the set value.2. Check that the AUTOSYOK and MANSYOK outputs are activated.3. Apply voltage to the U-Line equal to 100% GblBaseSelLine with a frequencyequal to 50 Hz and voltage U-Bus equal to 100% GblBaseSelBus, with afrequency outside the set limit.4. Check that the two outputs are not activated. The test can be repeated withdifferent frequency values to verify that the function operates for values lowerthan the set ones. If a modern test set is used, the frequency can be changedcontinuously.Testing the reference voltage1. Use the same basic test connection as in figure 19.The voltage difference between the voltage connected to U-Bus and U-Lineshould be 0%, so that the AUTOSYOK and MANSYOK outputs are activatedfirst.2. Change the U-Line voltage connection to U-Line2 without changing the settingon the local HMI. Check that the two outputs are not activated.6.9.1.3 Testing the energizing checkDuring the test of the energizing check function for a single bay arrangement, thesevoltage inputs are used:U-Line UL1, UL2 or UL3 line1 voltage inputs on the IEDU-Bus Bus voltage input on the IEDGeneralWhen testing the energizing check function for the applicable bus, arrangement shallbe done for the energizing check functions. The voltage is selected by activation ofdifferent inputs in the voltage selection logic.Live voltage level is fixed to 80% UBase and dead voltage level to fixed 40% UBase.Section 6 1MRK 502 049-UEN ATesting functionality104Commissioning manual
