Column-type porcelain insulator

The main function of insulators is to achieve electrical insulation and mechanical fixation, for which various electrical and mechanical performance requirements are specified. For example, under the influence of specified operating voltage, lightning overvoltage, and internal overvoltage, no breakdown or surface flashover should occur; under the influence of specified long-term and short-term mechanical loads, no destruction or damage should occur; after long-term operation under specified mechanical, electrical loads and various environmental conditions, no significant degradation should occur; the metal fittings of the insulators should not produce significant corona discharge under the operating voltage to avoid interference with radio or television reception. As insulators are widely used, their connecting metal fittings are also required to be interchangeable. Moreover, the technical standards for insulators require various electrical, mechanical, physical, and environmental condition tests based on different models and usage conditions to verify their performance and quality.