1 2A BEnergizingCheckLine voltageBus voltageANSI10000078-4-en.vsdVLiveBusEnerg > 50 - 120 % of GblBaseSelBusVLiveLineEnerg > 50 - 120 % of GblBaseSelLineVDeadBusEnerg < 10 - 80 % of GblBaseSelBusVDeadLineEnerg < 10 - 80 % of GblBaseSelLineVMaxEnerg < 50 - 180 % of GblBaseSelBus and/orGblBaseSelLineANSI10000078 V4 EN-USFigure 106: Principle for the energizing check functionThe energizing operation can operate in the dead line live bus (DLLB) direction, deadbus live line (DBLL) direction, or in both directions over the circuit breaker.Energizing from different directions can be different for automatic reclosing andmanual closing of the circuit breaker. For manual closing it is also possible to allowclosing when both sides of the breaker are dead, Dead Bus Dead Line (DBDL).The equipment is considered energized (Live) if the voltage is above the set value forVLiveBusEnerg or VLiveLineEnerg of the base voltages GblBaseSelBus andVGblBaseSelLine, which are defined in the Global Base Value groups, according to thesetting of GblBaseSelBus and GblBaseSelLine; in a similar way, the equipment isconsidered non-energized (Dead) if the voltage is below the set value forVDeadBusEnerg or VDeadLineEnerg of the respective Global Base Value groups. Adisconnected line can have a considerable potential due to factors such as inductionfrom a line running in parallel, or feeding via extinguishing capacitors in the circuitbreakers. This voltage can be as high as 50% or more of the base voltage of the line.Normally, for breakers with single breaking elements (<330 kV) the level is well below30%.When the energizing direction corresponds to the settings, the situation has to remainconstant for a certain period of time before the close signal is permitted. The purposeof the delayed operate time is to ensure that the dead side remains de-energized andthat the condition is not due to temporary interference.14.1.2.4 Voltage selection M12321-3 v11The voltage selection function is used for the connection of appropriate voltages to thesynchronism check, synchronizing and energizing check functions. For example, whenthe IED is used in a double bus arrangement, the voltage that should be selectedSection 14 1MRK 511 401-UUS AControl308 Bay control REC670 2.2 ANSIApplication manual
