High-tension dielectric string insulators designed for overhead transmission, substation terminations, and distribution grids.
Founded in December 2002 with a registered capital of 508 million Yuan, Jiangxi QOCI Electric Co. Ltd stands as a modern powerhouse in the electrical insulation sector. Located in the renowned Industrial Park of Luxi County, Pingxiang, Jiangxi Province, our manufacturing footprint covers a massive area of 100 mu (70,000 m²).
We are dedicated to serving world-class transmission lines and high-voltage substations, active in bolstering international green energy grids through innovative design, reliable performance, and cost-effective logistics. Our core competencies encompass toughened glass suspension discs, porcelain utility fittings, and advanced polymeric coating mechanisms designed to thrive in extreme weather conditions.
The global electric power sector is currently undergoing a massive transformation, driven by two key forces: grid modernization to integrate renewable energy systems and the massive deployment of Extra-High Voltage (EHV) and Ultra-High Voltage (UHV) transmission networks across long distances. In this landscape, Cap and Pin type insulators—predominantly made of tempered (toughened) glass or high-grade alumina porcelain—remain the absolute backbone of overhead mechanical support and dielectric isolation.
Unlike composite polymer options, cap and pin assemblies feature structural configurations utilizing steel pins, malleable cast-iron caps, and high-strength dielectric bodies. This design provides unparalleled mechanical security and high electrical reliability. Toughened glass, in particular, has captured massive market share due to its unique "self-shattering" property: a compromised glass shell shatters completely without losing its mechanical integrity, making damaged units instantly identifiable from ground level or by drone flyovers, eliminating the risk of costly line drops.
Key industrial regions, including North America, the European Union, the GCC, and Latin America, are investing heavily in line upgrades. Our products comply strictly with IEC 60305, ANSI C29.2, and BS standards, ensuring trouble-free integration into legacy utility networks and newly commissioned utility infrastructure alike.
By producing up to 39,000 tons of high-grade dielectric systems annually, Jiangxi QOCI Electric provides global utilities with reliable supply chains, preventing costly project delays while helping grid operators maintain mechanical load ratings ranging from 70kN up to 550kN under extreme operational conditions.
A comprehensive overview of profile shapes designed for variable meteorological, aerodynamic, and pollution environments.
Designed with shallow, well-spaced rib structures. The standard profile exceeds baseline leakage limits indicated in IEC 60305, allowing wind and rain to naturally clean surface deposits. Best suited for clean or mildly polluted environments where rainfall is frequent.
Characterized by deep, widely spaced under-ribs. This configuration blocks continuous arc bridging between adjacent ribs, providing a high leakage distance to spacing ratio (approx 3.2). Essential for coastal zones plagued by salt spray and areas with heavy industrial smog.
Exhibits a smooth, under-rib-free flat bottom coupled with a wide disc diameter. This prevents solid particulates like desert sand and dust from accumulating underneath. It relies on ambient wind forces for self-cleaning and prevents the bridging of heavy winter icing.
Features two distinct external sheds designed to reduce build-up from solid pollution. The flat bottom sheds facilitate swift cleaning by wind, and allow for easy manual washdowns during maintenance windows. Widely deployed in saline agricultural soil basins.
Consists of three highly isolated umbrella plates spaced along the insulation body. This geometry generates exceptional creepage pathways, maintaining reliable electrical characteristics in high-altitude environments and critical UHV transmission corridors.
Combines the high mechanical strength of toughened glass with the hydrophobic benefits of composite insulators. The factory-applied Room Temperature Vulcanizing (RTV) silicone coating contains mineral fillers that suppress leakage currents and absorb arc energy, eliminating regular washing cycles.
High-grade anti-pollution disc suspension glass insulator with 100kN rating.
120kN suspension insulator ideal for medium to high pollution AC grids.
Featuring deep rib profile for high dielectric margin in tropical fog areas.
70kN lightweight glass string insulator for sub-transmission systems.
Our high-strength cap and pin glass assemblies are deployed in low voltage, high voltage (HV), extra-high voltage (EHV), and ultra-high voltage (UHV) AC & DC systems.
Engineered to perform in mountain areas, lowlands, marine coastal regions, and sand-swept desert terrains.
Serving as tension and suspension strings for cross-arms, tension towers, and terminal portals.
Providing reliable isolation under mechanical tensions ranging from 70kN up to 550kN.
Deployed in petrochemical complexes, metallurgy plants, and heavy electric rail transit networks.
The insulation industry is shifting toward high-alumina compositions and enhanced thermal tempering processes. At Jiangxi QOCI Electric, we are continuously refining our glass formulation and oxygen kiln firing control. This optimization reduces internal micro-voids, increasing mechanical reliability and improving thermal shock resistance to prevent spontaneous shattering under sudden load changes.
Integrating sensors into transmission lines requires smart insulators. We are researching IoT-enabled cap and pin configurations. These components can monitor leakage currents and mechanical stress in real time, transmitting telemetry to SCADA systems to enable predictive grid maintenance before flashovers occur.
A view inside our state-of-the-art facilities, from automated pressing to high-voltage testing.
Frequently asked questions regarding cap and pin selection, mechanics, and maintenance.
As the global energy transition accelerates, the importance of electricity, renewable energy, and energy storage technologies continues to rise. We are highlighting our latest UHV and HV transmission insulation designs at Enlit Africa, showcasing solutions engineered for coastal and high-pollution environments.
Having withstood extreme environmental conditions including icing, high altitude, pollution, earthquakes, and typhoons, China’s insulator industry...
On behalf of our team at Jiangxi QOCI Electric, we invite you to join us at IEEE PES T&D 2026, the powerhouse showcase event for transmission and distribution technologies...
QOCI Electric, a leading global supplier of power equipment and high-voltage solutions, officially confirmed attendance at this regional energy development platform...
High-performance glass suspension insulators designed for extreme environmental challenges.
