IEC 61109:2025 pdf download,Insulators for overhead lines – Composite suspension and tension insulators with AC voltage greater than 1 000 V and DC voltage greater than 1 500 V – Definitions, test methods and acceptance criteria.

IEC 61109:2025 pertains to composite insulators designed for overhead power lines. These insulators feature a robust cylindrical insulating core made from a fiber-reinforced resin matrix, typically utilizing glass fibers for enhanced strength. Surrounding this core is a housing constructed from polymeric materials, complemented by metal end fittings that are permanently affixed to the insulating core.

The composite insulators detailed in this standard are primarily intended for use as suspension or tension line insulators. However, it is important to note that they may occasionally experience compression or bending forces, particularly when employed as interphase spacers. To assist users in understanding how to manage these additional loads, Annex C provides specific guidance on the performance and handling of the insulators under such conditions.

This standard is crucial for ensuring the reliability and safety of overhead line systems, as it addresses the unique challenges posed by the materials and configurations used in composite insulators. By adhering to IEC 61109:2025, manufacturers and operators can enhance the durability and performance of their insulator systems in various operational scenarios.