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Porcelain spool insulators, also known as porcelain spool-type insulators or simply spool insulators, are electrical insulating devices commonly used in overhead power transmission and distribution systems. These insulators are typically made of porcelain, a material known for its electrical insulating properties and durability. The main uses of porcelain spool insulators include:

Supporting Overhead Conductors: One of the primary functions of porcelain spool insulators is to provide mechanical support for overhead conductors, such as electrical wires or cables. These insulators are used to elevate the conductors above ground or other structures, maintaining a safe clearance distance.

Preventing Electrical Short Circuits: Porcelain spool insulators serve as electrical insulators, preventing electrical current from flowing between the conductor and the supporting structure. This insulation is essential for maintaining the integrity of the electrical distribution system and preventing short circuits.