RECTIPHASE CAPACITORS

Energy Storage Capacitors

High Energy Density (DC) Capacitors For Special Application :

  • High Energy Density
  • Very Low Inductance
  • High Peak Discharge Current
  • High Pulse Repetition Rate
  • Life With High Reliability
  • Applied Standard :

    Rectiphase Make Energy Storage‚ Special Application Capacitors are manufactured to meet the specification of IS 13666 : 1993.

    Operating Conditions :

  • Installation : Indoor.
  • Ambient temperature : 0° C to 50° C.
  • Altitude : Not exceeding‚ 1‚800 meters above sea level.
  • Mounting : Any position.
  • Design :

    Rectiphase Make Energy Storage Special Application Capacitors are designed with the aid of specially developed Computer Programmes. These are manufactured upto 150 KVDC rated Voltage.

    Construction :

    • The Capacitors are manufactured using all film or mixed dielectric impregnated with Non PCB fluid.
    • Winding is done and arranged in such a fashion that it gives minimum inductance‚ for external connection sparallel bus bar system is used.
    • Considering the high discharge current duty the inter element connections are designed to withstand the electromagnetic forces developed.
    • The bushings are designed so as to withstand the discharge curreri upto 400 KAmps.

    Standard Rating :

  • Voltage : 1.5 KV to 35 KV.
  • Energy in KJ : 1 KJ to 12.5 KJ.
  • Mfd. : 10µf to 250µf.
  • Inductance : Less than 30 nanohenry.
  • Peak current : Upto 375 KA.
  • Life expectancy : 10 5 shots.
  • Capacitors are designed to operate at value of percentage voltage reversal between 20 to 80.

    Categories :

    Energy storage capacitors are classified into different categories depending on maximum peak current‚ repetition rate‚ Working temperature‚ storage temperature or inductance value.

    Classification Based On Maximum Peak Current :

  • Category A1 Maximum peak current : 25 KA.
  • Category A2 Maximum peak current : 50 KA.
  • Category A3 Maximum peak current : 200 KA.
  • Category A4 Maximum peak current : 500 KA.
  • Classification Based On Repetition Rate :

  • Category A Upto : 5 PPM.
  • Category B Upto : 1 PPS.
  • Category C Upto : 10 PPS.
  • Category D Upto : 100 PPS.
  • Category E Over : 100 PPS.
  • Classification Based on Temperature :

  • Category L : 0 to 45° C ambient.
  • Category H : 0 to 50° C ambient.
  • Classification Based on Storage Temperature :

  • Category L1 : 0 to 70° C.
  • Category H1 : 0 to 50° C.
  • Classification Based on Inductance Value :

  • Category 1 : 15 to 60 nanohenry.
  • Category 2 : 61 to 150 nanohenry.
  • Category 3 : above 150 nanohenry.
  • Electrical Performance :

    • These Capacitors are charged at a relatively slow rate‚ from few milliseconds to a couple of seconds and discharged at very fast rate. Thus‚ very high power outputs are obtained.
    • Energy stored in a Capacitor is calculated as ; 1/2 CV2.
    • Generally‚ these types of Capacitors are operated in oscillatory circuits.
    • The % voltage reversal becomes an important parameter both in design and cost. Generally‚ this ranges upto 80% from 20%.

    D. C. Life :

    This is an important factor to be considered while designing Capacitors.

    The Capacitor is charged to its rated voltage and held at this Voltage continuously though a trickle charge with ±5 Percent Variation. The test is continued till there is a breakdown. The time of breakdown shall be taken as total D. C. life.

    Routine Test :

  • Visual Examination.
  • Sealing Test.
  • Test for Capacitance.
  • Insulation resistance test.
  • Voltage test between terminals.
  • Voltage test between terminals and container.
  • Measurement of dissipation factor.
  • Charge/discharge cycle test.
  • Type Test :

  • ESL Measurement.
  • ESR Measurement.
  • Capacitor discharge test.
  • D. C. Life Test.
  • Life Expectancy / Endurance test.
  • Over Load :

    The maximum permissible overload current can be 1.1 times rated peak discharge current at rated percentage Voltage reversal and rated Voltage. depending on percentage Voltage.

    ESR Measurement (Equivalent Series Resistance) :

    Charge / Discharge Cycle Test :

    Life Expectancy Test :

    In this test through an automatic switching device the capacitor charging / discharging cycle are repeated and the charging and discharging Current / Voltage parameters are monitred. The rated life of the capacitor varies between 104 to 106 cycles.

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