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Polymer insulators, also known as composite insulators, are electrical insulators made from a combination of polymer materials and fiberglass reinforced rods. They are widely used in various electrical applications, including overhead power lines, substations, and electrical equipment. Here are some reasons why polymer insulators are preferred over porcelain insulators in certain applications:

1. Lighter weight: Polymer insulators are significantly lighter than porcelain insulators. Their reduced weight makes them easier to handle, transport, and install, resulting in lower labor and operational costs.
2. Higher mechanical strength: Polymer insulators have excellent mechanical strength due to the combination of polymer materials and fiberglass reinforcement. They can withstand high mechanical loads, such as wind, snow, and ice, without experiencing significant deformation or breakage.
3. Better resistance to vandalism and theft: Polymer insulators are less attractive to thieves and vandals compared to porcelain insulators. The absence of metal parts in polymer insulators reduces their scrap value, making them less likely to be targeted for theft. Additionally, their non-fragile nature makes them more resistant to intentional damage.
4. Enhanced pollution performance: Polymer insulators typically have a hydrophobic surface, which means they repel water. This property makes them less prone to the accumulation of contaminants, such as dust, salt, or pollution, on their surface. As a result, polymer insulators exhibit better pollution performance and require less frequent cleaning and maintenance compared to porcelain insulators.
5. Improved electrical properties: Polymer insulators offer excellent electrical performance, including low leakage current, high insulation resistance, and good dielectric strength. These properties contribute to improved electrical reliability and efficiency in power transmission and distribution systems.

That being said, porcelain insulators still have some advantages over polymer insulators in certain applications. Porcelain insulators are highly resistant to ultraviolet (UV) radiation, making them suitable for outdoor installations exposed to direct sunlight. They also have lower thermal expansion coefficients, which may be advantageous in some specific environments.