Some things you should know about insulators
2025-12-02
Insulators of various types in China have successfully withstood the test of long-term icing, high altitude, pollution, high temperatures, low temperatures, ultraviolet radiation, rain exposure, lightning strikes, earthquakes, and typhoons—special operating conditions that challenge insulators. The successful operational experience has demonstrated that different types of insulators possess excellent electrical, mechanical, climatic, and seismic resistance characteristics. Each type of insulator has its own strengths and weaknesses. For instance, suspension porcelain insulators boast 95 years of operational experience, feature a rich variety of shed shapes, and their inherent defects are not easily detected, necessitating regular degradation monitoring and other operational maintenance activities. Suspension glass insulators, on the other hand, have the unique characteristic of self-explosion at zero value, eliminating the need for zero-value detection. Their shed shapes are relatively simple, mainly featuring deep ribbed profiles. Both of these types of insulators exhibit outstanding electromechanical performance and have service lives exceeding thirty years. Composite insulators offer distinctive advantages, including superior electromechanical performance, excellent anti-pollution capabilities, light weight, simple manufacturing processes, minimal constraints on diameter and structural height due to manufacturing techniques, high flexibility, good heat dissipation, excellent explosion-proof properties, and ease of operation and maintenance. They are non-puncture-type insulators, thus avoiding the issue of zero-value detection altogether, and have a service life of over twenty years. Suspension composite insulators, pillar composite insulators, hollow composite insulators, and pillar porcelain insulators have been widely adopted in AC and DC high-voltage, extra-high-voltage, and ultra-high-voltage transmission and transformation projects. This reflects that, over the past two decades, the development of composite insulators has reached today’s stage, where their outstanding performance and high reliability have been accepted and recognized by users.
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