Electrical Properties Of Cable Insulation Materials

It is cheap durable and widely available.

Electrical properties of cable insulation materials.

Electrical properties of polyolefins poly olefin structure and dielectric behavior. Temperature dependent electrical properties of thermoplastic polypropylene nanocomposites for hvdc cable insulation abstract. High mechanical strength to withstand the mechanical handling of cables. Cable insulation is used to provide electrical separation between conductors of a cable.

The electrical behavior of insulating materials is influenced by temperature time moisture and other contaminants geometric relationships mechanical stress and electrodes and frequency and magnitude of applied voltage. High dielectric strength to avoid electrical breakdown of the cable. Learn about the physical properties of different insulation and jacket materials. However the chlorine in pvc a halogen causes the production of thick toxic black smoke when burnt and can be a health hazard in areas where low smoke and toxicity are required e g.

In general the insulating materials used in cables should have the following properties. Water directly lowers electrical properties such as electrical resistance and dielectric strength. Electrical insulation materials are employed over the metallic conductors of underground cables at all voltage ratings. Confined areas such as tunnels.

Polymeric materials are employed as the insulation but the nature of the polymer may vary with the voltage class. During the historical development of cables numerous types of insulation have been employed. Cables laid in the soil can deteriorate by the action of chemicals in soils. Thermoplastic compounds are materials that go soft when heated and harden when cooled.

The suitability of insulating materials for such conditions can be decided by a long experience. High insulation resistance to avoid leakage current. Pvc polyvinyl chloride is the most commonly used thermoplastic insulator for cables. Effect of water and tropical tests.

Since paper insulation was used first in the power industry and was later replaced in low and medium voltage applications any comparison of properties usually employs the paper fluid system as the standard. These factors interact in a complex fashion.