Question

Write down different AC sources.​

Answer 1

Answer:

• Power Plant: The power plant is the place where the 3 phase AC power is generated. The reason for using 3 phases is that all the phase currents tend to cancel each other, maintaining a balanced load and can produce a rotating magnetic field used for electric motors. The power plant generally consists of steam turbine generators that work on steam obtained by burning coal, oil, and natural gas or from nuclear power plants. The AC power generated from the generators is converted to a high voltage at about 155KV using large step-up transformers.
• Transmission substations: The generated power at a high voltage of 155KV enters the transmission substations which consists of a step-down transformer, circuit breakers, and control equipment and converts the high voltage AC power to low voltage AC power of 60kV to be fed to the transmission circuits to the power distribution unit.

• Transmission Unit: The transmission unit consists of each 3-wire towers each carrying a phase and also a fourth wire which acts as a ground to protect from lightning. Normally transmission distance is about 400 km.
• Distribution Grid: It consists of step-down transformers that convert the incoming high voltage AC supply of 60kV to 12kV and distribution buses to transmit the AC power.
• Transmission Units to home: The transmission unit consists of 3 wired towers that carry the AC power in each phase and also consists of regulator banks to prevent transients in voltages and taps to obtain single phase or 2 phase supply from the 3 phase supply.
• AC power unit near homes: The AC power unit consists of a step down transformers on the electric poles, which step down the AC voltage from the transmission lines to normal AC voltage of 240V for home supply. The 240V supply comes with three wires, with two wires carrying 120V each at 180 degrees phase difference and the third wire a neutral or ground wire.

Answer 2

The following are the AC sources:-

1. AC generator
2. Thermal power generators
3. Nuclear power generators
4. House generators
5. Hydroelectric Power Plants
6. Car alternators
7. Bicycle dynamos

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