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Composite insulators, also known as polymer insulators, are electrical insulating devices used in high-voltage transmission and distribution systems. They are made of a composite material, typically a fiberglass reinforced polymer (FRP) core covered with a weather-resistant silicone rubber housing.

Composite insulators offer several advantages over traditional porcelain insulators. Here are some of the key features and benefits of composite insulators:

1. Light Weight: Composite insulators are significantly lighter than porcelain insulators, making them easier to handle, transport, and install. This reduces labor and equipment costs associated with installation.
2. High Mechanical Strength: The fiberglass core of composite insulators provides excellent mechanical strength and resistance to mechanical stresses such as wind, vibration, and impact. This makes them more durable and less prone to breakage compared to porcelain insulators.
3. Excellent Electrical Performance: Composite insulators offer superior electrical insulation properties, including high dielectric strength and low electrical conductivity. They can effectively withstand voltage stresses and prevent electrical leakage, ensuring reliable and safe operation of the transmission lines.
4. Resistance to Pollution: The silicone rubber housing of composite insulators is hydrophobic and has excellent resistance to pollution, such as dirt, dust, and chemical contaminants. This helps to maintain the insulator’s surface cleanliness and insulating properties, even in harsh and polluted environments.
5. Superior Performance in Contaminated Conditions: Composite insulators have a unique shed design that promotes the self-cleaning effect when exposed to rain or moisture. This helps to prevent the accumulation of pollution and ensures optimal performance, particularly in areas with high levels of pollution or salt deposits.
6. Longer Service Life: Due to their robust construction and resistance to environmental factors, composite insulators typically have a longer service life compared to porcelain insulators. This results in reduced maintenance and replacement costs over the lifetime of the transmission line.

Overall, composite insulators offer a reliable, lightweight, and cost-effective solution for high-voltage transmission and distribution systems. Their unique properties make them well-suited for various environmental conditions and contribute to improved system performance and reliability.