Leidian‑brand tempered glass insulators, first developed in China in 1958, have now surpassed 100 million units in cumulative sales, accounting for one‑half of the national market and one‑sixth of the global market.

For more than 60 years, Nanjing Electric’s Leidian‑brand tempered glass insulators have reliably supported key national projects, contributing to the construction of landmark initiatives such as the Three Gorges Project, the West-to-East Power Transmission Program, the Anhui‑to‑East Power Transmission Project, the Xinjiang‑to‑Out‑of‑Province Power Transmission Project, the Shaanxi‑to‑Out‑of‑Province Power Transmission Project, the Inner Mongolia‑to‑Out‑of‑Province Power Transmission Project, and the North China‑to‑South China Power Supply Project. They have also played a vital role in the Belt and Road Initiative, new infrastructure development, and global power‑sector growth. Since winning the bid for the State Grid’s Jin–Su UHV transmission line project in 2011, Nanjing Electric’s Leidian‑brand glass insulators have secured contracts for 24 UHV projects, including 10 UHV AC lines and 14 UHV DC lines, with a total delivery of 4.46 million units.

Leidian‑brand tempered glass insulators, first developed in China in 1958, have now surpassed 100 million units in cumulative sales, accounting for one‑half of the national market and one‑sixth of the global market.

For more than 60 years, Nanjing Electric’s Leidian‑brand tempered glass insulators have reliably supported key national projects, contributing to the construction of landmark initiatives such as the Three Gorges Project, the West-to-East Power Transmission Program, the Anhui‑to‑East Power Transmission Project, the Xinjiang‑to‑Out‑of‑Province Power Transmission Project, the Shaanxi‑to‑Out‑of‑Province Power Transmission Project, the Inner Mongolia‑to‑Out‑of‑Province Power Transmission Project, and the North China‑to‑South China Power Supply Project. They have also played a vital role in the Belt and Road Initiative, new infrastructure development, and global power‑sector growth. Since winning the bid for the State Grid’s Jin–Su UHV transmission line project in 2011, Nanjing Electric’s Leidian‑brand glass insulators have secured contracts for 24 UHV projects, including 10 UHV AC lines and 14 UHV DC lines, with a total delivery of 4.46 million units.

The Composite Business Division is equipped with state-of-the-art domestic and international production facilities for composite insulators, ensuring product quality that meets customer requirements. These include more than 20 sets of silicone rubber compounding equipment—such as kneaders, open‑mill mixers, extruders, and filter presses—with a theoretical annual compounding capacity of approximately 6,000 tons. The division also operates over 20 sets of rubber injection molding machines, ranging from 1,100 t to 550 t, 500 t, and 330 t, enabling an annual production capacity of up to 1.3 million rod‑type suspended composite insulators (converted to the 110 kV standard). In addition, more than 10 sets of imported crimping and pressing equipment—models such as 175/165/140—are available, fully satisfying market demand for various types of composite insulators. Furthermore, nearly 50 additional units of molding, extrusion‑coating, umbrella‑insertion, grading‑ring die‑casting, bending, and machining equipment are in place, ensuring complete capability to fulfill both diverse composite‑insulator specifications and large‑volume order production needs.

The Composite Business Division is equipped with state-of-the-art domestic and international production facilities for composite insulators, ensuring product quality that meets customer requirements. These include more than 20 sets of silicone rubber compounding equipment—such as kneaders, open‑mill mixers, extruders, and filter presses—with a theoretical annual compounding capacity of approximately 6,000 tons. The division also operates over 20 sets of rubber injection molding machines, ranging from 1,100 t to 550 t, 500 t, and 330 t, enabling an annual production capacity of up to 1.3 million rod‑type suspended composite insulators (converted to the 110 kV standard). In addition, more than 10 sets of imported crimping and pressing equipment—models such as 175/165/140—are available, fully satisfying market demand for various types of composite insulators. Furthermore, nearly 50 additional units of molding, extrusion‑coating, umbrella‑insertion, grading‑ring die‑casting, bending, and machining equipment are in place, ensuring complete capability to fulfill both diverse composite‑insulator specifications and large‑volume order production needs.

High‑voltage bushings are critical components in power systems, providing both current-carrying capability and insulation when high‑voltage lines pass through walls or equipment enclosures, connect equipment to one another, or serve as grounding points. Since 1958, when the company pioneered the domestic production of capacitive bushings, more than 50 years of manufacturing experience have enabled it to produce over 100,000 units of various types of high‑voltage bushings for the transmission and distribution industry—accounting for approximately 50% of the total number currently in service nationwide. Building on its established bushing‑manufacturing expertise, the company has actively explored new materials and advanced processes, successfully developing, in 2001, a glass‑fiber‑reinforced dry‑type capacitor core. Leveraging this technology, it has also introduced a series of glass‑fiber‑reinforced dry‑type bushings. At present, the company operates production lines for high‑voltage bushings employing three distinct manufacturing processes: oil‑paper capacitive, resin‑impregnated paper capacitive, and glass‑fiber capacitive.

High‑voltage bushings are critical components in power systems, providing both current-carrying capability and insulation when high‑voltage lines pass through walls or equipment enclosures, connect equipment to one another, or serve as grounding points. Since 1958, when the company pioneered the domestic production of capacitive bushings, more than 50 years of manufacturing experience have enabled it to produce over 100,000 units of various types of high‑voltage bushings for the transmission and distribution industry—accounting for approximately 50% of the total number currently in service nationwide. Building on its established bushing‑manufacturing expertise, the company has actively explored new materials and advanced processes, successfully developing, in 2001, a glass‑fiber‑reinforced dry‑type capacitor core. Leveraging this technology, it has also introduced a series of glass‑fiber‑reinforced dry‑type bushings. At present, the company operates production lines for high‑voltage bushings employing three distinct manufacturing processes: oil‑paper capacitive, resin‑impregnated paper capacitive, and glass‑fiber capacitive.

Hollow composite insulators are primarily used as critical components to increase creepage distance in high-voltage bushings, such as transformer bushings, GIS bushings, and wall‑through bushings. Key features include: explosion‑proof design—preventing the product from exploding and causing damage to surrounding equipment; lightweight construction; excellent seismic performance, making them suitable for earthquake‑prone regions; exceptionally high electrical insulation performance; outstanding resistance to ultraviolet radiation; and the use of environmentally friendly materials that are safe and harmless to human health.

Hollow composite insulators are primarily used as critical components to increase creepage distance in high-voltage bushings, such as transformer bushings, GIS bushings, and wall‑through bushings. Key features include: explosion‑proof design—preventing the product from exploding and causing damage to surrounding equipment; lightweight construction; excellent seismic performance, making them suitable for earthquake‑prone regions; exceptionally high electrical insulation performance; outstanding resistance to ultraviolet radiation; and the use of environmentally friendly materials that are safe and harmless to human health.

The company primarily manufactures high-voltage suspension porcelain insulators, high-voltage line post porcelain insulators, high-voltage line pin-type porcelain insulators, high-voltage porcelain cross‑arm insulators, and porcelain insulators for electrical equipment.
To accelerate industrial development and continuously enhance its product brand, the company is investing an additional RMB 25 million to expand its testing hall and product technology center, while steadily introducing cutting-edge technologies and equipment. With dependable product quality, it provides high‑quality services to customers both domestically and internationally.

The company primarily manufactures high-voltage suspension porcelain insulators, high-voltage line post porcelain insulators, high-voltage line pin-type porcelain insulators, high-voltage porcelain cross‑arm insulators, and porcelain insulators for electrical equipment.
To accelerate industrial development and continuously enhance its product brand, the company is investing an additional RMB 25 million to expand its testing hall and product technology center, while steadily introducing cutting-edge technologies and equipment. With dependable product quality, it provides high‑quality services to customers both domestically and internationally.

The main products include prefabricated substations, vehicle-mounted mobile substations, and protection and control equipment.

The main products include prefabricated substations, vehicle-mounted mobile substations, and protection and control equipment.