Insulator functions and requirements

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 specified operating voltage, lightning overvoltage, and internal overvoltage, no breakdown or surface flashover occurs; Under specified long-term and short-term mechanical loads, there will be no damage or destruction; After long-term operation under specified mechanical and electrical loads and various environmental conditions, there will be no significant deterioration; The insulator fittings shall not produce obvious corona discharge under the operating voltage, so as not to interfere with radio or television reception. Because insulators are widely used devices, interchangeability is also required for their connecting hardware.
In addition, the technical standards for insulators also require various electrical, mechanical, physical, and environmental conditions tests to be conducted on insulators based on their models and usage conditions, in order to verify their performance and quality.