The role of insulators: 1. Insulators are usually divided into breakdown type and non-breakdown type. 2. According to the structure, it can be divided into pillar insulator, suspension insulator, pin insulator, butterfly insulator, tension insulator, anti-pollution insulator and bushing insulator. 3. According to the application situation, it can be divided into line insulator, power station insulator and electrical insulator. Among them, the breakdown insulators for transmission lines are needle, butterfly and disk suspension, while the non-breakdown insulators are cross-bar and rod suspension. Breakdown insulators for power plants and electrical appliances include needle-type struts, hollow struts and bushings, while non-breakdown insulators include rod-type struts and ceramic sleeves for containers. 4. Insulators used in overhead lines are needle insulators, butterfly insulators, suspension insulators, ceramic crossbars, rod insulators and tension insulators. 5. The commonly used insulators are ceramic insulators, FRP insulators, synthetic insulators and semiconductor insulators.
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