The main function of the insulator is to achieve electrical insulation and mechanical fixation, for which various electrical and mechanical performance requirements are specified. Under the specified operating voltage, lightning overvoltage and internal overvoltage, no breakdown or flashover along the surface will occur; under the specified long-term and short-term mechanical load, no damage or damage will occur; in the specified machine After long-term operation under electrical load and various environmental conditions, no obvious deterioration will occur.
The fittings of the insulator do not produce obvious corona discharge phenomenon under the operating voltage, so as not to interfere with the reception of radio or television. Because insulators are used in large quantities, their connection fittings are also required to be interchangeable. In addition, the technical standards of insulators also require different electrical, mechanical, physical and environmental conditions to be tested on insulators to verify their performance and quality, depending on the model and conditions of use.
Since 2004, the main business income of major enterprises in China's insulator arrester industry has continued to grow rapidly, with an average annual growth rate close to 25%. With the improvement of China's insulation product manufacturing technology level, and the acceleration of economic development in East Asia, South Asia and other countries The major domestic enterprises seized the opportunity to actively explore the international market, and the export delivery value of the industry increased year by year. According to relevant research predictions, the compound annual growth rate of my country's insulator arrester manufacturing industry's sales revenue is 17.83% from 2012 to 2015. In 2015, the domestic insulator arrester industry's sales revenue will reach 40.3 billion yuan.
The power industry is the most important application market for insulator arrester products. Many power projects in China at this stage, such as the construction and renovation of urban and rural power grids, the West-East Power Transmission Project, the electrified railway construction project, and the launch of the UHV product market are not only for the insulator arrester industry. The development has provided a broad market space, but also put forward new requirements for the industry product market, promoted the adjustment of the market structure of insulator arrester products and the development of new technologies.