Composite insulator began internationally in the 1950s and has been in production for more than 40 years. Silicone rubber composite insulators were put into production in the world around 1967. China silicone rubber insulators were put into production in the world around 1967. There are thousands of high-voltage composite insulators in operation in the electric power system. With the implementation of extra-high voltage transmission projects, the demand for high-voltage composite insulators will increase significantly.
1、Composite insulator's composition
Composite insulator is mainly composed of three parts: glass fiber epoxy resin pulling rod, silicone umbrella skirt, and gold tool. The Silicone umbrella skirt adopts the whole injection process, which solves the key problem affecting the reliability of composite insulator: interface breakdown. The connection between the glass lead rod and the metal fixture adopts advanced crimping technology and is equipped with ultrasonic flaw detection system, which is characterized by high strength, beautiful appearance and small size.
2、Composite insulator is a special insulator, mainly used in low-voltage overhead distribution lines
It is made by using special raw materials and occupies an important role in use. When using plastic combination insulator, we should pay attention to some usage methods and matters, to prevent the aging of insulator, which will have certain influence on the equipment, damage the efficacy of the equipment and fail to play the effect of insulation.
Plastic composite insulator for low-voltage overhead distribution lines, generally using high-density polyethylene as the main material, plus anti-aging agent in one extrusion, can be made into various types of low-voltage insulators according to the different uses of insulators. Compared with the traditional porcelain insulators, these insulators can reduce the cost, facilitate the construction, improve the work efficiency, and its damage rate is almost zero, with good performance, high applicability, safety and reliability, and is also a kind of ideal insulator for low-voltage overhead distribution lines.
The plastic combination insulator has relatively good advantages and can show good use value in use, improve the efficiency of the project, ensure the normal conduct and implementation of the construction, and reduce the cost and expense of the project. The composite insulator installed on the transmission line, in the process of operation due to long-term exposure to electromechanical load, sun and rain, cold and heat changes, may have insulation resistance reduction, cracking or even breakdown and other faults, which brings potential threat to the reliability of power supply, therefore, the composite insulator online inspection is of great significance.
3、In high-voltage transmission lines, the aging of composite insulator directly threatens the safe operation of the power system
The aging of Composite insulator directly affects the safety of the power system. Aging insulators, especially zero-value insulators, are not only prone to overheating and expansion, leading to insulator head bursting and causing line breakage accidents, but also their low flashover voltage reduces the insulation level of high-voltage lines. Zero-value insulators refer to insulators whose potential distribution is close to or equal to zero at both ends of the insulator in operation. If the insulator has zero value, it means that it has been or will be penetrated, and it cannot play the role of insulation, which will seriously affect the safety of transmission and distribution of the line and substation, and needs to be replaced immediately.
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