1-State the advantages and disadvantages of using low-voltage transmission lines

Question

1-State the advantages and disadvantages of using low-voltage transmission lines.

2-State the advantages and disadvantages of using high-voltage transmission lines.

3-Why are transformers used with transmission lines?

4-A two-pole generator is to be connected to a 60 Hz power grid. Compute the speed of its turbine.

5-Why are there different voltage and frequency standards worldwide?

6-How is the lightning energy that strikes power lines dissipated?

7-Why are transformers often blown up when a lightning strike reaches its terminals?

Note: type the answer please

Explanation / Answer

State the advantages and disadvantages of using high-voltage transmission lines.

   Advantages:

·                       With increase in the transmission voltage size of the conductors is reduced (Cross section of the conductors reduce as current required to carry reduces).

·                     As the reduction in progress transportation prerequisite losses reduces results in better efficiency.

·                     Due to low current voltage drop will be less so voltage guideline improves.

Limitations:

·                     With the increase in the voltage of transmission, the lagging required between the conductors and the earthed tower increases. This increase the cost of line support.

·                     With increase in the voltage of transmission, more authorization is compulsory between conductors and ground. Hence higher towers are required.

·                     With increase in the voltage transmission, more distance is required between the conductors. Therefore cross arms should be long.

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