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High voltage insulator classification and use
Insulators can be classified into high voltage insulators and low voltage insulators according to the voltage used. Insulators can be divided into porcelain insulators, glass insulators, and organic material (epoxy-resinated) insulators according to manufacturing materials. Insulators can be divided into indoor and outdoor insulators according to the location of their installations. Insulators can be divided into 11 sub-categories and 48 series according to their structures and applications.
The main purpose of high-voltage insulators
1) High-voltage line insulators
1 High-voltage line rigid insulators: including pin-type porcelain insulators, porcelain cross-arm insulators and butterfly-type porcelain insulators.
High-voltage circuit porcelain crossarm insulator can be divided into all-ceramic, rubber-mounted, single-armed and V-shaped according to the structure; according to the installation can be divided into vertical and horizontal two; by 50% full-wave impact flash The network voltage can be divided into 185kV, 2lOkV, 280kV, 380kV, 450kV, 6lOkV and other levels. For high-voltage overhead transmission and distribution lines, can replace the needle and suspension insulators, and save high pole porcelain dan.
The high voltage line butterfly porcelain insulator is divided into 6kV, lOkV two levels according to the rated voltage.
Used for overhead power transmission and distribution line terminals, tension and corner bars for insulation and fixed conductors. At the same time, it is also widely used as a component with line suspension insulators as a component of the line fittings to simplify the fitting structure.
2 High-voltage line suspension insulators : including disc-suspended porcelain insulators, disc-suspended glass insulators, ceramic puller insulators, and ground insulators.
High-voltage line disc suspension ceramic insulators are divided into ordinary type and stain resistant type. For high voltage and extra high voltage transmission lines for hanging or tensioning conductors and insulating them from tower masts. Suspension insulators have high electromechanical strength and can be applied to various voltage levels through different strings. They are suitable for various strength requirements and are most widely used. The common type is suitable for general industrial areas. Comparing with ordinary type insulators, the stain-resistant type has a larger creepage distance and is convenient for weather-and-rain cleaning, and is suitable for coastal areas, metallurgical powders, chemical contamination, and more serious industrial pollution areas. When the stain-resistant insulators are used in the above areas, the size of the towers can be reduced, which has great economic value.
The use of high-voltage line disc suspended glass insulators and high-voltage line disc high voltage insulators is basically the same. The glass insulator has the characteristics of high mechanical strength, resistance to mechanical impact, good cold and heat performance, long life, excellent electrical performance and lightning resistance, and the umbrella tray is automatically broken and easy to be found during operation damage, greatly reducing the amount of insulation detection work. .
The high-tension porcelain insulator rod insulators are used in terminal tension and corner posts on lOkV and below overhead power lines for insulation and fixed conductors. It can be used instead of some butterfly porcelain insulators and disc-suspended porcelain insulators.
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