Core definition

A polymer/composite deadend insulator is an electrical component for power systems. It anchors overhead conductors to poles/towers ("dead-end" function) while insulating live conductors from grounded structures, using polymer-based composites instead of traditional porcelain/glass.

Key Components

>> Composite Body: Fiber-reinforced polymer (FRP, matrix like silicone rubber + glass/carbon fibers) with "sheds" (umbrella shapes) to boost creepage distance.

>> Metal Fittings: Galvanized steel/aluminum alloy at both ends (top: connects to conductor; bottom: attaches to support) for tension transfer and stability.

>> Optional Internal Shield: Carbon-filled polymer for high-voltage use, reducing electric field concentration.

Dual Core Functions

>> Mechanical: Absorbs conductor tension (from weight/wind) to prevent sagging, via FRP’s strength.

>> Electrical: Blocks current leakage (polymer’s high resistivity: 10¹⁴–10¹⁶ Ω·cm); sheds stop flashover in wet/polluted conditions.

Main Advantages (vs. Porcelain/Glass)

>> Lighter (up to 70% less), easier to install.

>> Stronger (tensile/impact resistance), less brittle.

>> Weatherproof (UV, corrosion-resistant; 20–30-year life vs. 15–20 for porcelain).

>> Hydrophobic (no frequent cleaning), lower maintenance.