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Overhead power line

An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. In the transmission lines, power companies used some polymer insulators or porcelain insulators to support and insulate for ensuring safety.

Overhead power line

Overhead power line

Overhead power line consists of one or more conductors (commonly multiples of three) suspended by towers or poles. Since most of the insulation is provided by air, overhead power lines are generally the lowest-cost method of power transmission for large quantities of electric energy.

Overhead power transmission and distribution lines are classified in the electrical power industry by the range of voltages:
◆ Low voltage (LV) – less than 1000 volts, used for connection between a residential or small commercial customer and the utility with LV insulators, such as shackle insulator.
◆ Medium voltage (MV; distribution) – between 1000 volts (1 kV) and to 69 kV, used for distribution in urban and rural areas with MV insulators, such as composite pin insulator.
◆ High voltage (HV; subtransmission less than 100 kV; subtransmission or transmission at voltage such as 115 kV and 138 kV), used for sub-transmission and transmission of bulk quantities of electric power and connection to electrical insulators, such as composite suspension insulator.
◆ Extra high voltage (EHV; transmission) – over 230 kV, up to about 800 kV, used for long distance, very high power transmission.
◆ Ultra high voltage (UHV) – higher than 800 kV


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