Glass insulator

Information

A glass insulator is a vital component used in high-voltage transmission lines. It supports live conductors on transmission towers while preventing electrical current from leaking to the ground. The most common type today is the tempered glass insulator, made through a special toughening process that delivers outstanding mechanical strength and durability. Tempered glass insulators offer unique benefits over porcelain. One standout feature is "zero-value self-shattering" — if an internal defect occurs, the insulator breaks into small pieces instead of developing hidden cracks. This makes damage instantly visible to inspection crews, significantly reducing the risk of unexpected line failures. Glass insulators also resist aging and environmental corrosion better than other materials. They maintain stable dielectric performance throughout their service life and perform well even in heavily polluted areas. Their strong arc resistance and thermal stability allow them to withstand lightning strikes, switching surges, and sudden temperature changes. Jiangxi QOCI Electric Co., Ltd. is a national high-tech enterprise and an A-rated supplier for State Grid and China Southern Power Grid. We manufacture both porcelain and tempered glass insulators ranging from 10kV to 1000kV, with strength classes from 40kN to 840kN. Our portfolio includes suspension, line post, pin-type, and cap-and-pin designs. Our glass insulators serve major projects across 30+ Chinese provinces, including the 110kV Manduo and 500kV Jinling transmission projects. With annual sales above RMB 400 million, we are a reliable partner committed to supporting global energy infrastructure with quality products and timely delivery.
Jiangxi QOCI Electric Co.,LTD.Z3.A52Jiangxi QOCI Electric Co., Ltd. is a national high-tech enterprise established in 2002, specializing in the research and development, production, and sales of porcelain and glass insulators for power transmission and distribution. We are a qualified supplier for both State Grid Corporation of China and China Southern Power Grid — the two largest grid operators in the country — and our products cover voltage ratings from 10 kV to 1000 kV, with mechanical strength classes ranging from 40 kN to 840 kN. Our portfolio includes line post insulators, pin-type, suspension, and cap-and-pin types, both in porcelain and glass, which have been deployed in major projects such as the 110kV Manduo Transmission Project and the 500kV Jinling Transmission Project, serving more than 30 provinces across China. We operate from a 70,000-square-meter facility in Jiangxi Province with a team of 136 employees, including 41 senior engineers, and have maintained annual sales exceeding RMB 400 million over the past two years. Our manufacturing processes are fully certified under ISO 9001, ISO 14001, ISO 45001, and ISO 50001, and we are recognized by China's Ministry of Industry and Information Technology as a Green Manufacturing Factory. We have also developed the industry's first intelligent production line for UHV insulators through our partnerships with leading universities. In short, we are a proven, reliable partner for high-voltage insulation solutions — from standard distribution lines to ultra-high-voltage transmission projects — and we are here to support your grid infrastructure needs with quality products and on-time delivery.

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