Medium Voltage V/S Low Voltage Generator

With what aim? After all, all this information is available using an internet search engine and a telephone.

Aim of learning.... unable to get info by internet... some of the difference i already know

If they’re doing the same work, there’s no difference.

What's the difference in those areas between a 100 KW three phase generator wired for 277 VAC delta and 480 VAC Wye?

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You are misunderstanding the concept.

Voltage levels refer to the transmission lines. The longer the distance, the higher the voltage.

End of discussion.

Generators extract energy from different sources. Comparing fuel and wind efdiciency is pointless. Thermal to electrical energy conversion is way more inefficient than mechanical to electrical, but efficiency is not the key. Profits of the investment are.

MV generators are normally used above 1000 KW. As you know as the rating increases in LV current values will be high.It is easier to handle a higher voltage than higher current.There is no major difference except in insulation and protection.Fuel consumption is purely a engine related subject.Ultimately a cost to be seen vis a vis the cost of large size cables and bus bars in Switch board vs Cost of MV generator ,Protection and switch gear.as rating goes up it is difficult to get a circuit breaker with suitable fault level.Even in MV Voltage levels like 3.3,6.6 kv and 11 kv to be selected suitably .

Thanks all for the replies

Low Voltage ranges below 600 V whereas Medium Voltage ranges in
600 V to 69 kV.