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 in utility poles. Later, one end of the high-voltage wire connection tower was hung with a large number of disk-shaped insulators. In order to increase the creepage distance, usually made of glass or ceramic, it 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.

A line column insulator is a steel insulator consisting of one or more insulating members that are permanently glued to a metal base and sometimes have a cap, and may be studs or one or more mounted on a metal base. The bolts are steel mounted on the support structure. For the rated voltage higher than 1000V, the frequency is not more than 100Hz, the altitude is not more than 1000m, the insulation and support wires are used in the AC power lines of ordinary areas and medium and heavy pollution areas, and the installation environment temperature is between -40°C to + 40°C.

The line column insulator can replace the pin insulator, and the spindle for pin insulator is a B type insulator. It is easy to cause breakdown and damage during operation. The tempered glass insulator will break at this time, and the porcelain insulator will not break. Therefore, the electric industry department has to spend a lot of manpower and material resources to conduct electrical test and preventive tests on porcelain insulators, and has certain deficiencies in economic and safe power supply. Therefore, with the development of manufacturing technology, line (solid) column insulators have emerged. These insulators all have a solid insulator and are Type A insulators, so there is no need to worry about breakdown along the inside of the insulator during operation, which is a major advantage.

Porcelain line post insulators are classified into eight grades of 95, 105, 125, 150, 170, 200, 250 and 325kV according to the rated lightning impulse withstand voltage value; It is divided into four grades of 3, 5, 8 and 12.5kN; it is divided into two types, vertical installation and horizontal installation according to its installation method; it is divided into two types according to the connection method of high voltage conductors: top tying type and top line clamping type; The connection between the foot and the base is divided into two types: separable threaded connection and non-separable type.

Porcelain Line Post Insulators

Generally used in township power lines, wired insulators, can play an important role in overhead transmission lines. Slowly developed at the end of the high-voltage high-voltage wire connection tower, a number of suspended insulators are hung. In order to increase the creepage distance, usually made of silica gel or ceramic, it is called an insulator. Insulators play two fundamental roles in overhead transmission lines, namely supporting the conductors and preventing current from returning to the ground. These two functions must be ensured. The insulators should not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions. Otherwise, the insulator will not have a major effect, which will damage the use and operating life of the entire line.

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