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

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SIMOVERT MVEngineering informationSystem componentsTransformers (continued), ) $ ! # $ >6Fig. 6/12 Parallel circuit: Rectifier side with one shared 12-pulse driveconverter transformer and commutating reactorsBraking chopper and braking resistorIf brake operation is required fora SIMOVERT MV diode rectifier,an optional braking chopperwith braking resistor can be implemented.Like the motor-side inverter, thebraking chopper in the outputrange P 20 = 400 kW to 2000kW consists of Power-Cardswith HV-IGBT power semiconductors.This guarantees thesame modular design as withthe drive converter in standarddesign. The braking chopperdesign is automatically adaptedto the cooling principle of thedrive converter (air or watercooling).For the braking chopper thesame engineering informationapplies as with the power sectiondimensioning of the driveconverter (Page 6/4 and 6/5).An external load resistor is connectedvia two connectors(center tap not required) toserve as braking resistor. Dueto the power loss of the brakingresistor attention must be paidto the design of the room wherethe drive converter is installed;if necessary, the braking resistorshould be installed outsidethe room.The breaking resistor must beequipped with a temperaturemonitor. This must be wired insuch a way that when energized,the converter is switchedoff.Requirements regarding the inductanceL apply for the brakeresistor and the cable routing.The time constant L/R may notexceed 20 µs i.e. L must be lessthan R ·20 µs.The brake resistor is not includedin the scope of supply.Fig. 6/13 Parallel circuit: Rectifier side with two 12-pulse drive convertetransformers. An additional phase shift allows 24-pulseharmonics.Chopper braking data with external load resistorDrive converterratedoutputS NkVADriveconverterratedvoltageV NkVBrakingresistancerequired(tolerance± 20%)RWSupplyvoltageof the brakingresistorV WkVChopperbrakingpowerP 20kWP DBkW800 2.3 26 – 40 3.9 400 1701000 – 1600 2.3 13 – 20 3.9 800 1501800 – 2400 2.3 8.68 – 13.3 3.9 1200 2002600 2.3 7.8 – 12 3.9 1300 2501000 3.3 40.8 – 62.6 5.6 500 3001300 – 2100 3.3 20.4 – 31.2 5.6 1000 4002300 – 3100 3.3 13.6 – 20.8 5.6 1500 5003600 – 4000 3.3 11 – 16 5.6 1900 6501300 4.16 45.4 – 70 7.1 700 3001700 – 2600 4.16 26.6 – 40.8 7.1 1200 5002900 – 7200 1 ) 4.16 16 – 24.5 7.1 2000 6008000 – 9100 4.16 16 – 24.5 7.1 2500 8001) Deviation: For drive converter 6SE8047-1CA01 the following is valid:P 20 = 1200 kW, P DB = 500 kW and R = 26.6 to 40.8 W Braking chopperExternalbraking resistor `, ) $ ! # $ =P DB = Continuous outputP 20 = Output permissible for 20 s every 90 sFig. 6/14 Block diagram of braking chopper with braking resistorFig. 6/15 Load diagram6/18 Siemens DA 63 · 2004
SIMOVERT MVEngineering informationSystem componentsOutput reactorsOutput reactors limit capacitivepre-charging currents for longcables.The maximum cable lengthswhich can be connected asstandard without having to usereactors, are specified in thefirst table on this page. Longercable lengths should be dimensionedaccording to the secondtable.The reactors have an iron coreand are suitable for drives withstandard induction motors anda rated motor frequency (frequencyat the start of fieldweakening) of up to 150 Hz.The output reactors limit therates-of-rise of the voltages atthe motor winding due to cablecapacitances.Maximum cable length 1 ) without output reactorDrive converter rated output Rated voltage Maximum cable length0.8 MVA to 9.1 MVA 2.3 kV to 4.16 kV 1 to 2 parallel cables3 parallel cablesmore than 3 parallel cablesScreened cables100 m80 m–0.66 MVA to 2.0 MVA 6.0 kV to 6.6 kV 1000 m 1000 mUnscreened cables–Maximum cable length 1 ) with output reactorNo. of reactors in series1 reactorDrive converter rated output Rated voltage Maximum cable lengthScreened cables0.8 MVA to 9.1 MVA 2.3 kV to 4.16 kV 1000 mSine-wave EMC filter for third-party or old motorsIf fixed-speed motors or non-Siemens motors are to be usedfor variable-speed drivestogether with SIMOVERT MV,then a sine-wave EMC filtermust be connected betweenthe drive converter and motor.It should be observed that onlyloads with a square-law torquecharacteristic (fans and pumps)can be driven; field weakeningis not permissible.Constant-load torque drives onrequest.When using sine-wave EMC filters,the drive converter outputquantities are almost sinewave.The voltage distortion fora 50 Hz output frequency isless than 5% when a sine-waveEMC filter is used. The stressingon motors, which are suppliedvia sine-wave EMC filters, liesunder the values according toDIN VDE 0530.When using a sine-wave EMCfilter, the drive converter outputmust be reduced (see technicaldata part 3).When ordering the sine-waveEMC output filter the motor ratedcurrent, the motor current inthe operating point and the motorno-load current should bestated in plain text.The possible rated outputfrequencies are restricted to therange between 30 Hz and66 Hz. The frequency controlrange is 1:10.Sine-wave EMC filters are suitablefor supplying Ex(pe) motorsin EEx pe type of protection(see Note on Page 6/13).Note:SIMOVERT MV drive convertersfor output voltages of 6.0 kVand 6.6 kV have an IHV outputfilter (Integrated High Voltage)as standard. For this filter, thesame engineering informationapplies as for the sine-waveEMC filter.Maximum cable lengths using sine-wave EMC filtersOutput Rated voltage Maximum cable lengthScreened cablesUnscreened cables0.66 MVA to 3.64 MVA 2 ) 2.3 kV to 4.16 kV 1000 m 1000 m6Note:All of the cable lengths, specified onthis page, apply when using the recommendedoutput cables as listedon Pages 6/20 - 6/23.The capacitances per unit lengthmust be appropriately convertedwhen using other cables than thoserecommended.1) Distance between the drive converter and motor,depending on the current,for max. 3 parallel 3-conductor EMC cables.2) Higher outputs on request.Siemens DA 63 · 2004 6/19
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SIMOVERT MV Medium-Voltage Drives 660 kVA to 9100 ... - Industry

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