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

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SIMOVERT MVEngineering informationDimensioning the power section and driveOverload capability of the drive converterWhen powering-up the drive,the drive converter can beloaded with a higher currentthan the rated current , N for upto 60 s. This maximum overloadcurrent for 60 s is:¦ 1.13 , N for drive convertersfor 2.3 kV 1 )¦ 1.20 , N for drive convertersfor 3.3 kV 1 )¦ 1.13 , N for drive convertersfor 4.16 kV 1 )Rated motor voltage 2.3 kVThis is permissible since it maybe assumed that the drive converterhas still not reached themaximum temperature specified.In operation, overload is onlypermissible if before overloadthe load current was less thanthe rated current , N . For driveswith overload duty, it is thereforenecessary to use the followingbase load current for therequired load:¦ 0.75 , N for drive convertersfor 2.3 kV¦ 0.80 , N for drive convertersfor 3.3 kV¦ 0.75 , N for drive convertersfor 4.16 kVThus, for a 560 s cycle time, thedrives can be overloaded for60 s with the following currents(refer to Fig. 6/2a):¦ 1.13 , N for drive convertersfor 2.3 kV 1 )¦ 1.20 , N for drive convertersfor 3.3 kV 1 )¦ 1.13 , N for drive convertersfor 4.16 kV 1 )Rated motor voltage 2.3 kVThe load duty cycles, shown inFig. 6/2, show examples, whichcan be roughly estimated due tothe similar overload situation.For other overload requirementsand in borderline cases, we recommendthat an inquiry is sentto the plant.Drive converters for 6 kV and6.6 kV as well as drive converterswith sine-wave EMCoutput filter (option Y15) are notspecified for overload. Thesedrive converters are designedfor drives with square-law loadtorque (pump and fan drives)and reach the maximum permissibleutilization with ratedcurrent , N .Short time current , kRated output current , NBase load current , 0Short time current , kRated output current , NBase load current , 0Rated motor voltage 3.3 kVRated motor voltage 3.3 kV6Rated motor voltage 4.16 kVRated motor voltage 4.16 kVa)b)Fig. 6/2Definition of the nominal as well as the overload and base load currents of the SIMOVERT MV drive converter fora) a 60 s overload conditionb) a 30 s overload condition1) 700 A at maximum6/4 Siemens DA 63 · 2004
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
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SIMOVERT MVOverview11/2 Application
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SIMOVERT MV Medium-Voltage Drives 660 kVA to 9100 ... - Industry

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