Correct Answer - Option 4 : Oil circuits and pumps
Electrical equipment of Hydro-Electric Power Plant:
Alternators:
- Each alternator is coupled to the turbine and converts the mechanical energy of the turbine into electrical energy.
- The alternator may be hydrogen or air-cooled.
- The necessary excitation is provided by means of main and pilot exciters directly coupled to the alternator shaft.
Transformers:
- A generating station has different types of transformers that are the main step-up transformers that step up the generation voltage for transmission of power, station transformers that are used for general service (e.g., lighting) in the power station.
- Auxiliary transformers which supply to individual unit-auxiliaries.
Switchgear:
- It houses such equipment which locates the fault on the system and isolates the faulty part from the healthy section.
- It contains circuit breakers, relays, switches, and other control devices.
Control Room Equipment: The main control and automation system in a hydroelectric power plant are associated with the start and stop sequence for the unit and optimum running control of power (real and reactive), voltage, and frequency.
