SMPS Power Plant

The salient features & specification for SMPS based power plants are given in the table below. The figure of high frequency switched mode power supply is shown below:

Salient Features of SMPS System: 

  • Smaller in size, 70 to 80 % reduction in size as compared to the thyristor controlled power plant.
  • Lesser in weight, 70 to 80 % reduction in weight as compared to the thyristor controlled power plant.
  • Modular concept, easy to maintain, easy to install and easy to expand the capacity.
  • Higher in efficiency (above 90 %).
  • Improved power factor (near to unity).
  • Controlled harmonic distortion.
  • Limited inrush current. No need to install higher capacity EA set.
  • Accepts wide input voltage variation.

Specification for SMPS Based Power Plant: (GR NO. G SMP-01- 03 MARCH 97). 

  • Standard Modules: 

    • Single Phase: 6.25 A, 12.5 A, 25 A & 50 A.

    • Three Phase: 50 A, 100 A & 200 A.

  • System Application: 

    • Rural System: For small loads.

    • Urban System: For large loads.

  • Battery Application: 

    • VRLA Battery.
    • Lead Acid battery.

  • Environmental: 

    • Dry Heat upto 55 °C.
    • Cold temp upto -5 °C.
    • Humidity upto 95 % RH at 35 °C.

  • COOLING: 

    • Natural cooling: For 6.25 A, 12.5 A & 25 A modules.

    • Forced cooling: For 50 A, 100 A & 200 A modules.

  • Input: 

    • Rural Application: 

      • 1 ϕ, 230 V (150 to 275V).
      • 3 ϕ 400 V (320 to 480V).

    • Urban Application: 

      • 1 ϕ, 230V (150 to 275V).
      • 3 ϕ, 400V (340 to 440V).

    • Frequency: 50 Hz (48 to 52 Hz).

    • Power Factor: Between 0.9 lag to 0.98 lead.

    • Efficiency: 

      • 80 to 85 % for 1 ϕ units.
      • 85 to 90 % for 3 ϕ units.

    • Harmonic Distortion: 

      • Voltage Distortion: within 10 %.

      • Current Distortion: within 20 % for loads between 50 to 100 %.

    • EMI/EMC: As per GR No. G/EMI-01/01 APR 90.

  • Output Voltage: 

    • Battery: 

      Lead Acid BatteryVRLA Battery
      Auto Float Voltage:52.8 V54 V.
      Auto Charge Voltage:56.4 V55.2 V.
      Extended Charge:65.0 VN.A.

    • Regulation: ±1 %.

    • Current limiting: 50 to 100 % adjustable.

    • Psophometric Noise: 2 mV / 4 mV with/without Battery.

    • Peak to peak ripple: 300 mV maximum.

    • Protection: DC overvoltage fuse / CB in output path for overload/Short circuit.

    • Soft Start (Switch ON): 

      • Build up time less than 10 s.
      • Overshoot less than 5 % per 20 ms.

    • Load Sharing: Within ±10 % at 50 to 100 % load.

    • Dimensions: 

      Rural SustemUrban System
      Height (max.)1500 mm2200 mm
      Depth (max.)600 mm600 mm
      Width (max)750 mm750 mm

    • Floor loadind: Less than 975 kg/m².

  • Indications: 

    • Functional (Module / System level): 

      • Mains available.
      • FR/FC on Auto Float.
      • FR/FC on Auto Charge.

    • Alarm (Module level): 

      • DCOV/DCUV/Output Fail
      • FR/FC Overload.
      • Fan Fail (Due to any reason).

    • Alarm (System level): 

      • Load Voltage High/Low.
      • FR/FC fail.
      • Mains out of range.
      • System overload.
      • Mains ON battery discharge.
      • Fan fail (at rack level).
      • Temp Compensation Fail.
      • Battery Fail/Isolated.

  • Battery Protection: 

    • Health monitoring: auto Float/Charge operation depends upon battery condition.

    • Charging Current: Battery current limiting in Float / Charge mode of operation.

    • Isolation: Battery cut-off at 44.4 V for Rural / Unattended stations.

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