SIMOVERT MV Medium-Voltage Drives 660 kVA to 9100 ... - Industry

SIMOVERT MVEngineering informationDimensioning the power section and driveInstallation conditions and correction factorsIf SIMOVERT MV drives areoperated at installation altitudesof 1000 m above sea level andabove or at ambient or coolingmediumtemperatures > 40 °C,then the current reductionfactors k T and k H , taken fromFig. 6/3 and Fig. 6/4 must betaken into account for the ratedcurrent.The permissible continuouscurrent , is given by:, ˆ , N · k H · k T, : permissible continuouscurrent, N : rated currentExample:Installation altitude 2000 mMaximum ambient temperature30 °CCorrection factor k H = 0.9Correction factor k T = 1.0,ˆ , N · 0.9 · 1.0 = , N · 0.9The current must be de-ratedfor this particular example.Hence, the drive converter mayonly be operated at 90% of itsrated current.At installation altitudes> 2000 m, in addition to a currentde-rating the voltagemust be reduced to complywith DIN VDE 0110/IEC 664-1.This reduction depends on theair and creepage distances inthe drive converter.The voltage reduction can betaken from Fig. 6/5 as voltagereduction factor k U .Example:Drive 6SE8020-1CA012 3-ph. 2.2 kV AC,2000 kVA, 280 AInstallation altitude 3000 mMaximum ambient temperature30 °CCorrection factor k H = 0.84Correction factor k T = 1.0Correction factor k U = 0.9,ˆ , N·0.84 · 1.0 = , N · 0.84Both the current and the voltagemust be de-rated by 16%and 10% respectively.The drive converter can still beoperated from a line voltage2 3-ph. 1.98 kV AC.Note:The ambient temperature maynot exceed 45 °C so that theoperating conditions for theopen-loop and closed-loopcontrol are maintained.The spatial mounting conditions,including the clearancesto walls and ceilings which mustbe observed, are listed in the dimensiondrawings in Section 7. Fig. 6/3Current reduction factor k T as a function of the cooling-medium temperature Fig. 6/4Current reduction factor k H as a function of the installation altitude6 Fig. 6/5Voltage reduction factor k U as a function of the installation altitudeSiemens DA 63 · 2004 6/5