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What is the Best Silicone Insulator for High Voltage?

For engineers and procurement professionals, the question “what is the best silicone insulator for high voltage” is both critical and technical. In high-voltage transmission systems, insulators must withstand extreme climates, voltage surges, and mechanical stress over long periods. This article provides a direct answer, supported by technical parameters, key performance features, and industry use cases.

 

insulator factory work

 Composite Silicone Insulators Meeting IEC 61109 Are the Best Choice

The most reliable and efficient high-voltage silicone insulator today is the composite type—made of an ECR fiberglass core, liquid silicone rubber sheds, and galvanized metal fittings. These outperform porcelain and glass insulators in electrical, mechanical, and environmental durability.

Industry Applications

  • High voltage transmission lines (35kV to 500kV)
  • Distribution lines and substation equipment
  • Harsh environments: high altitude, pollution, humidity
  • Renewable energy: wind farms and solar power grids

Technical Specifications

Parameter Specification
Rated Voltage (kV) 35 / 66 / 110 / 220 / 500
Shed Material Liquid silicone rubber, UV-resistant
Core Rod ECR epoxy fiberglass rod
Tensile Strength ≥70kN (custom up to 160kN)
Creepage Distance ≥1050mm (depending on rating)
Standard IEC 61109 / GB 19519

Key Performance Features

  • Anti-pollution flashover: Hydrophobic silicone sheds create water film to reduce flashover risk.
  • High mechanical strength: Core rod offers excellent tensile and bending resistance.
  • Lightweight: Over 50% lighter than porcelain alternatives, easier to install.
  • Environmental durability: UV, ozone, and cold-resistant; ideal for extreme climates.
  • Low maintenance: Self-cleaning surface reduces cleaning frequency; 30+ years of service life.

Compliance & Standards

WishPower silicone insulators are manufactured in full compliance with IEC 61109 and GB 19519 standards. All products are tested by third-party labs for electrical, thermal, and mechanical performance.

 

END

 composite insulators with liquid silicone rubber and fiberglass core are the top recommendation. WishPower provides a complete range from 35kV to 500kV, with fast delivery and full customization support.

WishPower is a professional factory and supplier of electrical power system equipment. If you have procurement needs, please contact us for quotations and customized service.

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