Voltage drop for 50Hz system

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bmabe

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We are involved in supplying equipment for several portable structures in Southwest Asia where the power grid is 380Y/220V or 400Y/230V 50Hz 3Ph. Do the standard calculations and calc tables apply for determining voltage drop? Or do we need to modify the calculations?

Barry Mabery
 
bmabe said:
We are involved in supplying equipment for several portable structures in Southwest Asia where the power grid is 380Y/220V or 400Y/230V 50Hz 3Ph. Do the standard calculations and calc tables apply for determining voltage drop? Or do we need to modify the calculations?

Barry Mabery
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Voltage drop calculation has only one standard worldwide formula only voltage changes no matter.
 
bmabe said:
We are involved in supplying equipment for several portable structures in Southwest Asia where the power grid is 380Y/220V or 400Y/230V 50Hz 3Ph. Do the standard calculations and calc tables apply for determining voltage drop? Or do we need to modify the calculations?

Barry Mabery
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Take a look at the formula(s) for voltage drop, they do not contain input for frequency.

Therefore, VD is VD it doesn't matter where it comes from.:D
(pun intended)
 
Thank you. That's what we believed was correct, but wanted to verify with the experts.

Barry Mabery
 
jghrist said:
The reactance depends on frequency. X = 2?pi?f?L
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Yes, ofcourse it depends but X is small comparing to R and 60Hz and 50Hz does not make too much difference.

He has to check cable catalog in most of cable catalog X is already been calculated and given.Data cable catalog based on IEC are all 50Hz and NEC cables are for 60Hz.
 
Hameedulla-Ekhlas said:
He has to check cable catalog in most of cable catalog X is already been calculated and given.Data cable catalog based on IEC are all 50Hz and NEC cables are for 60Hz.
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Right answer for the wrong reason - cable construction, termination rules, and ampacities in 50hz countries are all different from the stuff you are used to in the USA. Theres no reason that has to be the case, but it just happens that thats the way it is.

Thus when in Rome (or Southwest Asia) you need to do as the Romans do, and use the local tables for calculating what you may do and not do.

Also note worthy is that the NEC does not rule on permissible voltage drop, but many countries regs do.

You need a copy of the local regs, of if the countries regs are rubbish or non-existant, get a copy of the British wiring regs, as many 50Hz countries use those as a basis.
 
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