Transmission lines|distribution lines|Difference Between Transmission and Distribution Line

 

The transfer of an electric power from a power station(where power is generated) to consumer is known as electric supply system . 

An electric supply system consists of three major components viz. , the power station ,. the transmission lines and the distribution system . Electric power is produced at the power stations which are located at favourable places , generally these power stations are away from the consumers. We have to transmit it over large distances to load centers with the help of conductors known as transmission lines. Then power is distributed to large number of small (domestic) and big (industrial) consumers through a distribution network . 

The Difference Between Transmission and Distribution Line

 (1) Transmission Line helps in transfer of electricity from a power plant to the various substations whereas the distribution line carries electricity from the substation to the consumer’s end. i.e, to the domestic and commercial customers.

(2)Transmission line carries power or electricity in three phase supply system (three wires of phases r,y,b). Distribution system requires a single phase supply system for carrying electricity(three phases as well as neutral wire) .

(3)In transmission line ,neutral is not provided (to decrease cost of conductor) whereas in distribution line neutral is present.

(4) Transmission lines are not insulated (to minimize cost of insulation as high voltage requires high insulation) but distribution lines are insulated( for safety) .

(5) Transmission line carries electricity at a very high voltage (about 11000 volts ) whereas Distribution lines carries electricity at a very low and safe value level (about 220  or 440 volts.)

(5)Transmission line, conducts current at 69 kilo ampere or more, but distribution line conduct current at less than 69 kilo ampere.

(6)Distribution line are thin as compared to the transmission line.

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