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Composite insulators, also known as polymer insulators, are advanced components for power transmission and distribution systems, featuring a lightweight, high-performance design. Unlike traditional glass or porcelain insulators, they consist of three core parts: a fiberglass-reinforced polymer (FRP) rod (providing mechanical strength and insulation), silicone rubber sheds (offering anti-pollution and hydrophobic properties), and metal end fittings (connecting to conductors and towers).
Their key advantages include exceptional hydrophobicity—silicone rubber sheds repel water, preventing pollution flashover in coastal, industrial, or high-humidity areas. Weighing 70%–80% less than porcelain insulators, they simplify transportation and installation, especially in remote or mountainous regions. They also resist breakage from impact or thermal shock, with a wide operating temperature range of -60°C to +120°C.
Common applications span medium-voltage (MV) to ultra-high-voltage (UHV) grids, offshore wind farms, and high-speed rail traction systems. With a service life of 20–25 years and low maintenance needs (no frequent cleaning), they balance reliability and cost-effectiveness, making them a vital choice for modern, resilient power infrastructure.
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The main structure of the composite insulator is generally composed of three parts: shed sheath, glass fiber and end fittings. The shed sheath is generally made of high temperature vulcanized silicone rubber material, the fiber is generally a glass fiber reinforced plastic composite material with glass fiber as the reinforcing material and epoxy resin as the matrix; the end fittings are generally carbon cast steel or carbon structural steel with hot-dip galvanized coating on the outer surface. The fiber and the shed sheath bear the mechanical and electrical loads respectively, thus combining the advantages of the superior atmospheric aging resistance of the shed sheath material and the good tensile mechanical properties of the fiber material. Silicone rubber is currently the best material for composite insulator shed group sheaths, and its unique hydrophobic migration performance is the key to successful use of silicone rubber in polluted areas.
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Company Profile
Nanjing Electric was founded in 1936 and is the first high-voltage ceramic manufacturer in the history of China's electrical industry. It is also the headquarters of Baiyun Group in the East China region. Nanjing Electric has been rated as one of the top 500 mechanical industrialization enterprises in China and a first-class industrial enterprise in China. At present, the base covers an area of 19 hectares and employs 1000+ people. The industrial base was put into operation with equipment in 2015. Nanjing Electric specializes in developing glass insulators, composite insulators, and ceramic insulator products. In 1958, China developed the first Tempered Glass insulator and condenser Bushing, filling the domestic gap. The company's products are exported to more than 120 countries and regions around the world, such as the Americas, Australia, the Middle East, Southeast Asia, and more than 50% of countries and regions in Europe. The main customers are national power grid companies or local power grid companies in various countries. The domestic market has achieved full coverage. The company's products are widely used in national strategic projects, including 33 UHV projects above 800KV. Our company is the largest insulator supplier in national engineering.
Nanjing Electric International Co., Ltd., formerly known as the Overseas Business Unit of Nanjing Electric Technology Group, established an international trade company in 2021 based on the development strategy of the group. With insulators and sleeves as the two flagship exhibits, the company actively carries out resource and multi-party cooperation around common values and market views. On the way to the world, international trading companies will firmly step forward and work hard for the century old white clouds and the world's white clouds.
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The international trade team participated in international power exhibitions held in countries each year such as Germany, the United States, Brazil, Saudi Arabia, Egypt, India, Italy, Saudi Arabia, Australia, the Philippines, Thailand, Spain, Mexico, etc; Track the progress of key power projects in various countries; Further promote the internationalization process of products.
Facing the future, the company will focus on the needs of national power construction, seize the opportunities of new power infrastructure, ultra-high voltage projects, the "the Belt and Road" construction, and the development of green energy. According to the strategic positioning of Baiyun Electric Group to build the company into the second headquarters of the group relying on the Yangtze River Delta, the company will build and develop a world-class insulator and related product R&D and production base, explore and build new products, new technologies, and new formats, Make new contributions to national power construction and global power development, and strive to become a century old enterprise.
