What type of insulator is typically used for high voltage lines and can be found in suspension form?

The porcelain suspension insulator is commonly used for high voltage lines due to its durability, strength, and excellent electrical insulating properties. This type of insulator is designed to be suspended from a structure, allowing it to support the weight of the conductor while keeping it insulated from the tower or pole. Its shape and material allow it to withstand significant mechanical stress from wind, ice, and electrical arcing, making it ideal for transmission lines where reliability is crucial.

Porcelain, as a material, offers excellent thermal and mechanical properties, helping to ensure that high voltage lines remain stable during extreme weather conditions. The design of suspension insulators allows for the easy addition of multiple units in series, enabling engineers to customize the electrical and mechanical characteristics as needed for specific applications in the grid.

Other types of insulators, while useful in certain contexts, are not primarily employed in suspension configurations for high voltage lines.