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    nik1989's Avatar
    nik1989 Posts: 3, Reputation: 1
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    #1

    Jun 6, 2012, 06:14 AM
    transformer
    Hi,
    A transformer is rated 20kva 3300/200V. To circulate rated current in the primary, what is the value of the voltage to be applied and how to arrive at it?
    My doubt is in Short circuit test, we apply a voltage less than the rated on primary to get rated primary current. But rated primary current is calculated by :(20kva/3300).. I am terribly confused. Somebody please hel me..
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jun 6, 2012, 09:28 AM
    This may help:

    http://nptel.iitm.ac.in/courses/IIT-...I/pdfs/1_7.pdf

    http://theego.com/HND/UEE.PDF

    http://www.ee.iitb.ac.in/~drivelab/E...E003_EXPT2.pdf
    nik1989's Avatar
    nik1989 Posts: 3, Reputation: 1
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    #3

    Jun 6, 2012, 07:30 PM
    Thank you sir but still I am not satisfied..

    Quote Originally Posted by tkrussell View Post
    This may help:

    http://nptel.iitm.ac.in/courses/IIT-...I/pdfs/1_7.pdf

    http://theego.com/HND/UEE.PDF

    http://www.ee.iitb.ac.in/~drivelab/E...E003_EXPT2.pdf
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Jun 7, 2012, 05:26 AM
    Then try this:

    Introduction to the Design and Analysis of Building Electrical Systems - John H. Matthews - Google Books

    What is your confusion?

    Why are you asking this question?
    nik1989's Avatar
    nik1989 Posts: 3, Reputation: 1
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    #5

    Jun 7, 2012, 05:49 AM
    Sir my doubt is: Rated current is the ratio of rated output(say 20kvA) and rated Voltage(say 3300V) in a 20kva 3300/220V transformer. In short circuit test we short LV winding and apply reduced voltage to the primary so as to circulate rated current in the primary. How does rated current flow when a reduced voltage is applied? I am not able to understand that.
    Thank you..
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #6

    Jun 7, 2012, 06:21 AM
    Simply by the virtue of a short circuit allows and causes the rated current to flow in the sec winding with low voltage applied to the pri.
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