Answered Questions

  • What is the power ratio between power in Star and Delta circuit?

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    KaranSorout  

    • Member Since Jul-2006 | Jul 13th, 2006


    The power ratio between Star to Delta is 1:3

    Explanation:

     

    Let?s suppose Vs be the supply voltage per phase.

    So the line voltage of the supply will be ?3Vs.

    Now assume any type of load; for simplicity I?m assuming it a only resistive load.

    And let it be ?R? per phase.

     

    For Delta connected load:

     

    Calculation for per phase power; PD= I2R

     

    Where I ? load current (per phase)

    And,

    I = ?3Vs/R       {as line voltage of the supply is directly applied to the phase of the delta load}

    So,

                Pd = (?3Vs/R )2R = 3Vs2/R  watts per phase.

    For 3 phases:

                P3D = 3Pd = 3*3Vs2/R = 9Vs2/R watts.

     

    Now for Star connected load:

     

    PS = I2R = (Vs/R)2R = Vs2/R watts

    For 3 phases: P3S = 3PS = 3 Vs2/R watts

     

    Conclusion:

    P3S / P3D  =  3Vs2/R / 9Vs2/R = 1/3

    It may be better concluded by drowing figures. If any variations, can connect to me through karan.sorout@gmail.com  

    RUP KAMAL KUTUM

    • Feb 3rd, 2018

    Well first you assumed voltage per phase as Vs and Line voltage as sqrt(3) x Vs: Which is for star connection. Then, you assumed the same thing for Delta Connection(where line and phase voltages are t...

    Anbumozhi R

    • Dec 3rd, 2017

    Power is Same. Whether it is star to Delta conversion or Delta to star conversion. Power is 1:1

  • Assume a particular CPU works properly with 100 MHz clock. What happens if clock is increased to1000 MHz?

    Yogesh

    • Dec 15th, 2006

    If CPU works properly at 100Mhz then it may not work properly at 1000MHz if it is not designed for 1000 MHz. The moment you feed the 1000MHz it may hang /malfunction coz of overclocking and all transistors in CPU would go in matastable states.