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DC glass insulators are specialized components for direct current (DC) power transmission and distribution systems, designed to address the unique electrical challenges of DC circuits—such as persistent electric fields and ion migration—while maintaining the core advantages of glass insulators. Unlike alternating current (AC) systems, where voltage polarity reverses periodically, DC systems operate with constant polarity, demanding insulators with enhanced resistance to surface charge accumulation and long-term pollution effects. Below is a detailed introduction to DC glass insulators, covering their structural features, performance advantages, applications, and key distinctions from AC insulators.
Crafted from high-strength tempered borosilicate glass with anti-static surface treatments, these insulators prevent charge buildup that can lead to surface flashover in DC environments. Their optimized shed geometry enhances pollution resistance and water runoff, making them suitable for long-distance HVDC (High-Voltage Direct Current) transmission lines, cross-border energy interconnections, and renewable energy grid integration projects. Compared to AC insulators, DC variants feature thicker insulating cores and hydrophobic coatings to counteract ion migration, ensuring stable performance over decades of operation in harsh climates.
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Since 1958, the total sales volume of Thunder Lightning brand tempered glass insulator has exceeded 100 million pieces, accounting for half of the country and one sixth of the world.
The glass insulator is composed of an iron cap, toughened glass parts and steel pin, which are combined with cement adhesive. Before assembling, the top of the steel pin is provided with a soft gasket, the inner cavity of the iron cap and the pin ends at the contact point with the cement adhesive are covered by tar. The gasket and tar are used to buff in case of damage when insulator facing thermal expansion and contraction. Toughened glass parts are used to insulate.
Glass insulators have the characteristics of small size, light weight, zero-value self-breaking, and easy detection; high mechanical strength; good arc resistance; good self-cleaning performance and not easy to age. In addition, the spraying material has the advantages of strong hydrophobicity, long-term resistance to pollution, low leakage current on the surface, and maintenance-free during operation; it is widely used in various circuits at home and abroad.
Disk suspension glass insulators are divided into standard type, anti-pollution type, DC type, , aerodynamic type, out-ribs type and ground wire type.
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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.
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.
