Knowledge of high voltage line post porcelain insulator
Line post insulator is a kind of rigid insulator composed of one or more insulating parts permanently glued on the metal base and sometimes a cap, and can be rigidly installed on the support structure with stud bolts or one or more bolts installed on the metal base. It is used for insulating and supporting conductors in AC power lines with nominal voltage higher than 1000V, frequency less than 100Hz and altitude less than 1000m in ordinary areas and medium and heavy polluted areas. The ambient temperature of its installation site is between – 40 ℃ and ~ + 40 ℃.
The line (solid) post insulator can replace the pin insulator. The pin insulator is a type B insulator, which is prone to breakdown and damage during operation. The toughened glass insulator will break itself at this time, while the porcelain insulator will not. Therefore, the power industry department has to spend a lot of manpower and material resources on electrical detection and preventive test of porcelain insulators, which has some deficiencies in economic and safe power supply. Therefore, with the development of manufacturing technology, line (solid) post insulators have emerged. This kind of insulator has solid insulator and belongs to type a insulator. Therefore, there is no need to worry about breakdown along the interior of the insulator during operation, which is one of its advantages.
According to the rated lightning impulse withstand voltage, the line post porcelain insulator is divided into eight grades: 95, 105, 125, 150, 170, 200, 250 and 325kv; According to the rated bending failure load, it is divided into four grades: 3, 5, 8 and 12.5kn; According to its installation mode, it can be divided into vertical installation and horizontal installation; It can be divided into top binding type and top clamp type according to the connection mode with high-voltage conductor; According to the connection mode between steel foot and base, it can be divided into separable (threaded connection) and non separable.
Psn-105 / 5zs connecting threads produced by our company are available in M16, M18 and M20. At the same time, in order to improve the creepage distance, psn4-105 / 5zs pollution-resistant products are developed.
Post time: Apr-13-2022