I. Failure Characteristics The fracture typically occurs inside the ball-end or socket-end metal fitting. The primary symptom is a tensile failure load that is significantly lower than the rated design value. II. Root Cause Analysis Excessive Crimping Force: The pressure applied during the crimping process exceeds the radial compressive strength of the core rod, leading to internal structural damage. Improper Crimping Position: The crimping dies are not centered; the compression zone should ideally be located in the middle of the fitting's connection area. Poor Machining Precision of Fittings: Issues such as eccentricity of the inner hole, insufficient cylindricity, or internal tapers can...

The manufacturing process of composite insulators has evolved significantly, from dry-sleeve assembly to integral injection molding. Simultaneously, core rods have advanced from standard types to high-temperature, acid-resistant, and high-impact-strength versions to meet the demands of modern production techniques. Currently, the integral injection molding combined with crimped end-fittings is the most recommended structure for suspension insulators. However, a technical contradiction exists: according to polymer characteristics, core rods with higher heat resistance often exhibit lower impact strength. Solving this requires collaboration between core rod and insulator manufacturers to ensure the rod can withstand injection temperatures while maintaining the high impact strength necessary for...

Insulators are essential components used extensively in power grids. Currently, porcelain insulators are the most widely used, followed by glass insulators. In recent years, organic or composite insulators have also seen increasing application across domestic networks. 1. Classification of Insulators Insulators come in various shapes and sizes, categorized by their application and structure: By Application: Line insulators and station insulators; indoor and outdoor types. By Shape/Structure: Suspension, pin-type, post, long-rod, bushing, and stay (guy) insulators. Special Types: Anti-pollution (dust-proof) insulators and insulating cross-arms. The porcelain or glass components provide both electrical insulation and high mechanical strength. To ensure durability, these parts are often...