2007-01-09 07:39:38 · 5 answers · asked by johnsmithinlondon 1 in Science & Mathematics ➔ Engineering
UK voltage is variable and though quoted as 240V is closer to 230V. The indian voltage (on which I cannot comment , but I'll take your word for it) is probably equally variable so there may well not be that much difference. However, I suspect that the ambient temperature may be the principal factor being generally rather higher in India than in the UK and influencing the rate of heat loss from the transformer.
2007-01-09 08:40:34 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Two things affect heat generation in a trasformer; the ambient temperature, and the waveform (including amplitude, frequency, and harmonics) of the current.
If the AVERAGE Indian voltage is lower than that seen in the UK, the current will increase by the same proportion ... but the heat is proportional to the square of the current. Therefore a 10 percent change in current is approximately 20 percent change in heat generated. (All the losses are what is known in the industry as 'copper' losses ... i.e. they are proportional to resistance and the square fo the current).
It is likely that the power system (in general) in India is carrying a higher harmonic content than the UK, as it is still more-or-less in the process of development. Higher harmonic content means a higher AVERAGE amplitude, which in turn means more heating.
Finally, the AVERAGE temperature of the cooling medium (water or air) is almost guaranteed to be higher in most of India than it would be in the UK. This means the surface of the transformer will not shed heat quite as readily as it might in the northern climate ... making it appear hotter to the touch.
2007-01-09 09:37:23 · answer #2 · answered by CanTexan 6 · 0⤊ 0⤋
UK voltage is 240, India's is 220. A difference of 10%. So the current draw in India will be 10% more which will make the resistance loss (heat) 10% more.
Frequency is the same (50hz)
2007-01-09 07:46:28 · answer #3 · answered by catarthur 6 · 3⤊ 0⤋
What about the frequency? I think UK has 50 Hz, what is the frequency of power in India? If not 50 Hz, then that isyour problem the freq must be the same. In the US we have 60 Hz power.
2007-01-09 07:45:25 · answer #4 · answered by Anonymous · 1⤊ 0⤋
power supply voltage india
2016-05-22 23:33:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋