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Using polymer insulators in transmission lines offers several benefits:

1. Lighter weight: Polymer insulators are significantly lighter than traditional porcelain insulators. This reduces the mechanical stress on supporting structures, making them more cost-effective and easier to install.
2. Higher mechanical strength: Polymer insulators have excellent mechanical strength and can withstand high mechanical loads, such as wind and ice loads. They are less prone to breakage or damage during extreme weather conditions.
3. Improved performance in polluted environments: Polymer insulators have better pollution performance compared to porcelain insulators. The hydrophobic nature of the polymer material prevents the accumulation of dirt, dust, and pollutants on the surface, thereby reducing the risk of flashovers and maintaining reliable operation.
4. Enhanced resistance to vandalism and theft: Polymer insulators have minimal scrap value and are less attractive to thieves, reducing the risk of theft and vandalism compared to porcelain insulators, which are made of valuable materials.
5. Ease of maintenance: Polymer insulators require minimal maintenance. Their smooth surface repels dirt, eliminating the need for regular cleaning. Additionally, they do not suffer from aging or cracking like porcelain insulators and have longer service lives.
6. Cost-effectiveness: Polymer insulators are generally more cost-effective than porcelain insulators. Their lighter weight translates into lower transportation and installation costs. Moreover, the reduced need for maintenance and the longer service life contribute to overall cost savings.
7. Improved electrical performance: Polymer insulators have excellent electrical insulation properties. They are designed to maintain reliable performance under various voltage and environmental conditions, allowing for efficient power transmission.

Overall, the use of polymer insulators in transmission lines offers advantages in terms of weight, mechanical strength, pollution performance, maintenance, cost, and electrical performance, making them a preferred choice for many power utilities.