Characteristics of High Voltage post insulator

The post insulator product is composed of iron cap, tempered glass piece and steel foot, and is glued together with cement cement. This product adopts the most advanced cylindrical head structure in the world, characterized by small head size. Light weight, high strength and large creepage distance. It can save metal materials and reduce line cost. In order to meet the needs of live working, the traditional domestic structure shape is adopted on the brim. Indoor post insulators are used for power distribution devices and electrical equipment in indoor power stations and substations with rated voltages of 6~35kV to insulate and fix conductive parts. The insulator is applicable to the ambient temperature of - 40 ℃~+40 ℃, the altitude of the installation site is not more than 1000m for ordinary type, and not more than 4000m for plateau type. Insulators can be divided into three types according to the glue mounting structure: external glue mounting, internal glue mounting and combined glue mounting.
Tempered glass insulator has the characteristic of zero value self breaking. As long as it is observed on the ground or on the helicopter, there is no need to board the pole to detect piece by piece, reducing the labor intensity of workers.
The annual self breaking rate of products introduced from the production line is 0.02-0.04%, which can save the maintenance cost of the line and has good arc resistance and vibration resistance.
During operation, the new surface of the glass insulator suffering from lightning burns is still a smooth glass body, and has a tempered internal stress protective layer. Therefore, it still maintains sufficient insulation and mechanical strength.
The galloping disaster caused by conductor icing occurred many times on 500 kv lines, and the mechanical and electrical performance of the glass insulator subjected to conductor galloping did not decline after testing.
It is generally reported by the power sector that the glass insulators are not easy to accumulate dirt and are easy to clean, and the glass insulators running on the southern line are washed clean after rain.
The mechanical and electrical properties of glass insulators on lines in typical areas are regularly sampled and tested after operation. The accumulation of thousands of data shows that the mechanical and electrical properties of glass insulators after 35 years of operation are basically the same as those when they leave the factory, and there is no aging phenomenon.

With large main capacity, uniform distribution of string voltage and dielectric constant of glass of 7-8, toughened glass insulators have large main capacitance and uniform distribution of string voltage, which is conducive to reducing the voltage borne by insulators near the conductor side and the grounding side, so as to reduce radio interference, reduce corona loss and extend the service life of glass insulators. The operation practice has proved this.