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  • Need a correct answer about the reason why the transmission voltages are multiples of 11

    tonytomson

    Member

    Updated: Oct 26, 2024
    Views: 1.1K
    When searched for this doubt, I found different answers.Got very confused.Someone help to find correct.
    The answers which I found for this are

    1) Due to: average voltage generated by alternator is multiplied by form factor(1.11) and expressed as rms value(eg:200v is generated,so rms value=>200*1.11=220v)

    2) In early days there is a transmission loss of 10%.In order to compensate that and ensure getting the required fair vale an 10% is extra added when it is transmitting(eg:to get 200v at the end,110% of 200 that is 220v is transmitted)

    3) For the first time it is accidently chose 110v and now also it is following.

    Which answer should I choose???????.......someone plz help.....

    NB: I know that there are exceptional voltages like 25kV,765kV,132kV,165kV etc. I am not talking about them.


    Plz help........thanks in advance
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  • aarthivg

    Member • Mar 16, 2012

    @ #-Link-Snipped-#
    The voltages 6.6kV,11kV,33kV.... is due to the Form Factor. Where form factor for sinusoidal waveform is the ratio of RMS Value to Average Value.

    0.707Em/0.637Em = 1.11

    where Em = Maximum Voltage.
    Because of this factor the voltage levels are in multiples of 11, 1.1, etc.
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  • absunilkumar

    Member • Mar 21, 2012

    tonytomson
    When searched for this doubt, I found different answers.Got very confused.Someone help to find correct.
    The answers which I found for this are

    1) Due to: average voltage generated by alternator is multiplied by form factor(1.11) and expressed as rms value(eg:200v is generated,so rms value=>200*1.11=220v)

    2) In early days there is a transmission loss of 10%.In order to compensate that and ensure getting the required fair vale an 10% is extra added when it is transmitting(eg:to get 200v at the end,110% of 200 that is 220v is transmitted)

    3) For the first time it is accidently chose 110v and now also it is following.

    Which answer should I choose???????.......someone plz help.....

    NB: I know that there are exceptional voltages like 25kV,765kV,132kV,165kV etc. I am not talking about them.


    Plz help........thanks in advance
    first answer is correct
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    Cancel

  • khyzer shamsi

    Member • Jun 5, 2012

    25kva nd other voltages which r not in the ratio of 1.1 are approximate voltages.
    the theoritical exavt voltage will always b in the multiple of 1.1
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