7.8.2 FunctionalityInadvertent or accidental energizing of off-line generators has occurred oftenenough due to operating errors, breaker head flashovers, control circuitmalfunctions, or a combination of these causes. Inadvertently energized generatoroperates as induction motor drawing a large current from the system. The voltagesupervised overcurrent protection is used to protect the inadvertently energizedgenerator.Accidental energizing protection for synchronous generator (AEGGAPC) takes themaximum phase current input from the generator terminal side or from generatorneutral side and maximum phase to phase voltage inputs from the terminal side.AEGGAPC is armed when the terminal voltage drops below the specified voltagelevel for the preset time.7.8.3 Function blockAEGGAPCI3P*U3P*BLOCKBLKTRTRIPSTARTARMEDIEC09000783-1-en.vsdIEC09000783 V1 ENFigure 103: AEGGAPC Function block7.8.4 Input and output signalsTable 108:AEGGAPC Input signalsName Type Default DescriptionI3P GROUPSIGNAL- Three Phase Current inputU3P GROUPSIGNAL- Three Phase Voltage inputBLOCK BOOLEAN 0 Block of functionBLKTR BOOLEAN 0 Block of tripTable 109:AEGGAPC Output signalsName Type DescriptionTRIP BOOLEAN Trip signal from accidental energizing protectionSTART BOOLEAN Start signal from accidental energizing protectionARMED BOOLEAN True when accidental energizing protection isarmed1MRK 502 034-UEN - Section 7Current protection201Technical Manual
