Detail the classification and maintenance management of insulators
A device installed between conductors of different potentials or between conductors and grounded components that can withstand the effects of voltage and mechanical stress There are many types of insulators and different shapes. Although the structure and shape of different types of insulators are quite different, they are composed of two parts: insulators and connecting fittings. Insulators are a special type of insulation control that can play an important role in overhead transmission lines. In the early years, insulators were mostly used for telephone poles, and they were slowly developed in the end of high-type high-voltage wire connection towers with many disk-shaped insulators.
It is designed to increase the creepage distance and is usually made of glass or ceramics, which is called an insulator. Insulators should not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions, otherwise the insulators will not have a significant effect and will damage the use and operating life of the entire line. Insulators can be divided into suspension insulators and pillar insulators according to different installation methods; according to the insulation materials used, they can be divided into porcelain insulators, glass insulators and composite insulators (also called composite insulators).
According to the different voltage levels, it can be divided into low-voltage insulators and high-voltage insulators; according to the different environmental conditions, the pollution-resistant insulators used in dirty areas are derived; according to the types of voltages, DC insulators are derived; there are still various special uses Insulators, such as insulating crossarms, semiconductor glaze insulators and tension insulators for power distribution, bobbin insulators and wiring insulators. In addition, according to the possibility of breakdown of the insulation, it can be divided into two types of A-type non-breakdown type insulators and B-type instant breakdown type insulators.
Suspension insulators are widely used in the insulation and mechanical fixing of high-voltage overhead transmission lines and soft busbars in power generation and substations. In the suspension insulator, it can be divided into disc-shaped suspension insulator and rod-shaped suspension insulator. Disc-shaped suspension insulators are the most widely used insulators for transmission lines. Rod-shaped suspension insulators have been widely used in Germany and other countries. Pillar insulators are mainly used for insulation and mechanical fixing of busbars and electrical equipment in power plants and substations. In addition, post insulators are often used as components of electrical equipment such as disconnectors and circuit breakers.