Explain, why transmission lines are built as three-phase lines? Explain, why ver

Question

Explain, why transmission lines are built as three-phase lines? Explain, why very high voltage has to be used for energy transmission? Explain situations in which energy has to be transmitted by DC lines. Explain Oersted, Faraday and Maxwell contribution to electrical engineering. When and where in USA the first AC line was built. What it is British Thermal Unit (Btu)?. How much energy is needed for vaporization of one liter of water? Prove that instantaneous power of inductors is p(t) = u(t) i(t). Explain physical meaning of the reactive power. Prove that power balance is not satisfied for the apparent power.

Explanation / Answer

Transmission lines are built as three phase systems due to the following advantages:

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