Yuan Lei tells you about the application of gas phase oxidation in composite insulators.

Release time:

2024-01-29 09:35


Yuan Lei tells you about the application of gas phase oxidation in composite insulators.


Insulators are necessary for high-voltage and ultra-high-voltage power transmission lines. At first, only porcelain and glass insulators were used. By the 1970 s, high-temperature vulcanized silicone rubber composite insulators were first introduced in Germany. The composite insulator is composed of three parts: insulating core rod, silicone rubber umbrella sleeve and connecting fittings at both ends. It is processed by integral injection pressure process. It includes rod suspension type, composite needle type, composite pillar, composite cross arm, composite dry wall bushing type, composite insulator for electrified railway, etc. Compared with porcelain, glass and other traditional insulators, composite insulators have the advantages of light weight, high strength, strong resistance to pollution, easy maintenance and transportation, and are used in many countries in the world. So far, 27 countries and regions in the world have used composite insulators, and China is one of the countries with the largest use of composite insulators.
The development of composite insulators in our country started late but the starting point is very high. On the basis of absorbing the experience and lessons of foreign composite insulator production technology, we have developed our own composite insulators. At present, the composite insulators developed in China have a new breakthrough in crimping and sealing technology, and also have the characteristics of no need to detect zero value, no cleaning for life, not easy to brittle fracture, low production cost, and its quality is incomparable to other countries. In addition to meet the needs of the domestic power grid, the number of exports is increasing year by year.
The development of domestic composite insulators has driven the demand for fumed silica. Because the silicone rubber umbrella sleeve of the composite insulator is based on high molecular polymer silicone rubber, supplemented by flame retardant and anti-aging agent, the main filler is fumed silica, and the coupling agent is vulcanized at high temperature and high pressure. The fumed silica has a good reinforcing effect on the silicone rubber umbrella sleeve, and can also ensure the smooth surface of the silicone rubber umbrella sleeve. In addition, due to the low impurity content of fumed silica, it can meet the requirements of electrical properties of composite insulators, which can not be replaced by precipitated silica.

As a new type of insulator, composite insulator has shown a good momentum of development in China, and it is also a development trend of the whole world in the future, which will greatly promote the development of fumed silica industry.




Composite, insulator, silicone rubber, silica, umbrella sleeve, domestic, research, development, vulcanization

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