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Dc power plants for telecom and data
 

Dc power plants for telecom and data

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    Dc power plants for telecom and data Dc power plants for telecom and data Presentation Transcript

    • DC Power Plants for Telecommunications and Data Presented to INFOBATT 2005 Thomas G. Croda Principal EngineerCSI Telecommunication 1Engineers
    • Introduction Engineering Requirements Applicable Standards CSI Telecommunications 2 Engineers
    • Engineering ConsiderationsEquipment to be PoweredRequired Reserve TimeMinimum Operating VoltageSize of the Facility CSI Telecommunications 3 Engineers
    • Plant Size and Design Load current Voltage operating range Required reserve time Recharge time Battery sizing Rundown problems Allowable plant voltage drop Grounded (+) conductor CSI Telecommunications 4 Engineers
    • 2000 - 25,000 Amp DC Power Plant Dual Level Distribution Shunt -48 VDC Return Primary Secondary + + Power Bay Power Bay1 24 1 24 600 A Fuses “A” Power2 23 2 23 1 Battery Battery 2 String #N “B” Power String #1 1300 AH 1300 AH To Equipment11 12 11 12 Bays Return 14 800 Amp 800 Amp Battery Battery Charger Charger #1 #N 480 VAC 480 VAC 3 Phase 3 Phase CSI Telecommunications 5 Engineers
    • Load Current At float voltage At end of discharge CSI Telecommunications 6 Engineers
    • Voltage Operating Range See T1.315 for new equipment (40-57 VDC) Check specific equipment for its operating range Float voltage End of discharge voltage Equalize voltage CSI Telecommunications 7 Engineers
    • Required Reserve Time Regulatory requirements Reliability requirements Economic issues CSI Telecommunications 8 Engineers
    • Recharge Time Reliability Requirements Rundown Problem Charger sizing CSI Telecommunications 9 Engineers
    • Rundown Problem The problem of more load than the chargers will support What happens with a 1000 Amp load at 54 VDC? Since the entire load is "constant power" the load at 40 VDC is: 54 * 1000 / 40 = 1350 Amps The MINIMUM amount of chargers must exceed 1350A. CSI Telecommunications 10 Engineers
    • Plant Type Single or Dual Level Distribution Architecture Small plants use single level distribution Large plants use dual level distribution CSI Telecommunications 11 Engineers
    • DC Power – Single Point Ground Minimal current in framework Balanced distribution to cancel fields CSI Telecommunications 12 Engineers
    • Applicable Standards T1.311 DC Power Systems – Telecommunications Environment Protection T1.315 Voltage Levels for DC-Powered Equipment in the Telecommunications Environment NFPA 70 National Electrical Code Applicable Local Standards CSI Telecommunications 13 Engineers
    • Allowable Plant Voltage Drop2 volts - battery to load0.25 volts - between battery and primarydistribution1.0 volt - between primary and secondarydistribution0.5 volts - between secondary distributionand load bay0.25 volts - allocated for fuse, circuitbreaker, and shunt lossOther allocations are possible CSI Telecommunications 14 Engineers
    • Battery Sizing Considerations Average Discharge Current Average Discharge Voltage used for calculating Average Discharge Current 45 VDC is a good value (42- 48)/2=45VDC If the load is 1000 ADC at Float (54 VDC), the load at 45 VDC is 1000*54/45 = 1200 ADC USE THIS VALUE TO SIZE YOUR BATTERY CSI Telecommunications 15 Engineers
    • Battery Disconnect Not generally used in the telecom industry. If used, it should be 2-pole to completely isolate the battery. Each string should have a separate disconnect so one failure will not fail the plant. CSI Telecommunications 16 Engineers
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    • Questions?CSI Telecommunications 25 Engineers