tonytomson
tonytomson
Branch Unspecified
16 Mar 2012

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

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
aarthivg

aarthivg

Branch Unspecified
17 Mar 2012
@ tonytomson
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.
absunilkumar

absunilkumar

Branch Unspecified
21 Mar 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
khyzer shamsi

khyzer shamsi

Branch Unspecified
06 Jun 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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