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    Power Factor Improvement: Guided by Osman Ali Sir

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    Md Taieebur Rahman

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    Power Factor Improvement: Guided by Osman Ali Sir

    Uploaded by

    Md Taieebur Rahman
    10 views29 pages

    Original Title

    PFI_with_Shadman_Notes

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    Copyright:

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    Download as pptx, pdf, or txt
    10 views29 pages

    Power Factor Improvement: Guided by Osman Ali Sir

    Uploaded by

    Md Taieebur Rahman

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
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    Power Factor Improvement

    Guided By Osman Ali Sir


    an inductive circuit taking a lagging current I from supply voltage V; the angle of
    lag being φ. The phasor diagram of the circuit is shown in Fig. 6.1.
    If each side of the current triangle OAB of Fig. 6.1 is multiplied by voltage V, then we get the Power
    Triangle OAB

    (i)

    (ii)

    (iii)
    A power factor less than unity results in the following disadvantages :

    1. The smaller the power factor, the larger is the kVA rating. Therefore, at low power factor, the kVA rating
    of the equipment has to be made more, making the equipment larger and expensive.

    2. To transmit or distribute a fixed amount of power at constant voltage, the conductor will have to carry more
    current at low power factor.
    3. The large current at low power factor causes more I2R losses in all the elements of the supply system.
    4. The large current at low lagging power factor causes greater voltage drops in alternators, transformers,
    transmission lines and distributors.
    5. The reactive component of current prevents the full utilisation of installed capacity.
    The low power factor is mainly due to the fact that most of the power loads are inductive and, therefore,
    take lagging currents. In order to improve the power factor, some device taking leading power should be
    connected in parallel with the load. One of such devices can be a capacitor.
    Normally, the power factor of the whole load on a large generating station is in the region of 0·8 to 0·9.

    Fig. Static capacitor (i) Delta & (ii) Star configuration

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