Insulators in the overhead transmission line
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Insulators are necessary in overhead power lines to prevent current from flowing through support poles and towers, which would be hazardous. Effective insulators have high mechanical strength, electrical resistance, relative permittivity of insulating material, and ratio of puncture strength to flashover. Common types of insulators used in overhead power lines include pin, suspension, strain, and shackle insulators.
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Insulators in the overhead transmission line
- 1. Insulators in the Overhead Transmission line
- 3. • It is obvious that if overhead power lines are not properly insulated from their support poles/towers, the current will flow towards the ground through the poles/towers which also become hazardous. • Overhead line insulators should have the following properties: high mechanical strength in order to withstand the conductor load, wind load etc. • high electrical resistance in order to minimize the leakage currents • high relative permittivity of insulating material so that the dielectric strength is high • high ratio of puncture strength to flashover
- 4. Types Of Insulators Used In Overhead Power Lines • Pin type insulators • Suspension type insulators • Strain insulators • Shackle insulators