Synchronous Generators
Type of Cooling	Power Rating	Frequency	Terminal Voltage	Features
Air Cooled (2 Pole)	3 - 160 MW	50/60 Hz	400 V to 15.75 kV	TEWAC (Bottom or Side mounted)/ Open air cooling Bottom/ Side/ Top Terminals Brushless/ Static Excitation
Air Cooled (4 Pole)	3 - 40 MW	50/60 Hz	3.3 kV to 13.8 kV	TEWAC (Bottom or Side mounted)/ Open air cooling Bottom/ Side/ Top Terminals Brushless/ Static Excitation
Hydrogen Cooled (2 Pole)	60 - 270 MW	50/60 Hz	10.5 kV to 16.5 kV	Frame mounted H2 coolers Bottom/ Top Terminals Brushless/ Static Excitation
Excitation systems
Type of Mounting	Power Rating		Features
Non Over-hang	Up to 832 kW		Fuse protection for each Diode RC snubber protection
Over-hang	Up to 602 kW		RC snubber protection Online changeable brush holder assembly for earth fault monitoring
Special purpose machines
BHEL is capable of manufacturing equipment suitable for strategic applications as required by customers.