high stress. When porcelain fails, it can send sharp fragments into neighbouring components, increasing the risk of secondary damage. Composite insulators offer a safer and more reliable alternative for modern power grids as their strong mechanical structure will not rupture under extreme stress.
Conductor cores for resilient power grids
In the on-going energy modernization transition, polymeric matrix composites( PMC) cores offer higher strength-to-weight ratio than traditional steel cores used in aluminum conductor steel reinforced( ACSR) conductors. They also expand less when heated, increase transmission capacity and reduce energy losses, maximizing efficiency. Multi-wire PMC cores maintain structural integrity even when individual strands are damaged, ensuring safe and consistent performance in overheard lines.
Beyond the grid
While utility poles and insulators are often the most visible examples, composite materials play an important role across a wide range of electrical applications where insulation and strength are key.
One long-established application is insulated rail joints, used to carry the electrical signals that indicate track position across railway lines. Glass fiber composite rail joints offer electrical insulation and resistance to environmental impacts like UV, heat, and moisture.
Used across Continuous Welded Rail( CWR) and jointed tracks, composite insulated rail joints are easy to install, needing no adhesives or welding. This differs from their heavy steel counterparts, which require multiple complex installation steps. The high electrical insulation of the rail joints also ensures virtually failsafe performance, saving costly delays for railway operators and passengers.
Whether electrical or transportation, the demands on decades-old infrastructure continues to grow. The modernisation of electrical components will require expertise and education on advanced materials like composites to provide advantageous properties and longevity.
For further information, please visit www. exelcomposites. com / composites-for-electrical-distribution /
Issue 79 PECM 63