the generator voltage for modern utility-connected generators ranges from in smaller units to in larger units. the generator high-voltage leads are normally large aluminium channels because of their high current as compared to the cables used in smaller machines. they are enclosed in well-grounded aluminium bus ducts and are supported on suitable insulators. the generator high-voltage leads are connected to step-up transformers for connecting to a high-voltage electrical substation (usually in the range of 115 kv to 765 kv) for further transmission by the local power grid.