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Difference between transmission lines and distribution lines


Electrical power is produced at the generating stations which is then transported to the points of utilization with the help of electric power lines. The electric utility companies install two different types of electric power lines.transmission line and distribution line for conveying the electric power from power plant to consumer’s premises for utilization.

here the key differences between transmission line and distribution line. We also briefly explained that what the transmission line and distribution line are.

What is a Transmission Line?
Transmission lines are the power lines that carry the electric power at high voltage from generating station to a number of substations. Generally, the transmission lines carry the electricity over long distances such as across the province. The typical transmission voltage is more than 69 kV.

The transmission lines are usually supported by tall steel towers and uses a three-phase, three-wire AC system for power transmission. The transmission lines are segmented in two parts that is primary transmission line (transport power from power plant to the receiving station) and secondary transmission line (which transports electric power from receiving station to the substations).

What is a Distribution Line?
The power lines that are used for carrying electricity from substations to the consumers are known as distribution lines. Generally, the distribution lines carry the electricity over short distances (within a city). The support to the distribution lines is usually provided by the wooden poles, RCC poles, steel poles, etc.

In practice, the distribution lines may be single-phase or three-phase. The AC system adopted at distribution stage is 3-phase 4-wire system, where three wires are provided for lines conductors and one wire is for neutral. The distribution lines carry the electric power at lower voltage (less than 10 kV).

The distribution lines are also of two types. primary distribution lines (carry power from substation to distribution station) and secondary distribution lines (carry power from distribution station to the end consumers).

Difference between Transmission Lines and Distribution Lines
Both transmission and distribution lines are used for carrying the electric power. 
Difference in application
Transmission lines are used for carrying electric power from power stations to the substations.
Distribution lines are used for carrying the electricity from substations to load points such as home, businesses, industries, etc.

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