High mechanical rating toughened glass insulator modules designed for overhead high voltage and ultra-high voltage power distribution lines.
In high-voltage electrical grid infrastructures, the select mechanical and electrical configuration of insulation systems acts as the primary barrier against catastrophic failure. The Glass Isolator U420blp represents the highest echelon of electrical isolation engineering. Designed for overhead distribution lines running under high, extra-high (EHV), and ultra-high voltage (UHV) capacities, the U420blp has a rated mechanical failing load of 420kN.
What characterizes the U420blp specifically is its anti-pollution profile (indicated by the 'L' and 'P' identifiers). In regions with high environmental contamination—ranging from coastal saline mist to heavy industrial particulate smog—dust and salt accumulation form conductive layers on standard surfaces. Our U420blp models feature deep, well-calculated under-ribs that increase the leakage path (creepage distance), significantly reducing leakage current and minimizing the probability of dry-band arcing and complete flashover.
Manufactured utilizing premium thermal tempering techniques, providing maximum residual mechanical resistance. The cap-and-pin design ensures load balance even when the glass component is structurally compromised.
Engineered for coastal zones, chemical industrial zones, and high particulate regions. The configuration limits dust accumulation and facilitates natural rain washing.
Toughened glass provides automatic detection: if damaged, the glass shell shatters completely but the mechanical pin holds the line securely. No hidden internal punctures.
Chinese Manufacture fast delivery time with best price
Founded in December 2002, Jiangxi QOCI Electric Co., Ltd. has established itself as an industry leader in manufacturing high-strength cap and pin type suspension glass insulators. With a substantial registered capital of 508 million Yuan, our corporation is strategically situated in the Industrial Park of Luxi County, Pingxiang, Jiangxi Province—the world-renowned capital of electrical ceramic and power transmission insulation technology.
Our site covers an area of 100 mu, equipped with the most advanced automation and environmental control systems. We specialize in producing toughened glass components that are crucial for structural load containment and insulation in transmission towers. Our business model integrates rigorous material sourcing, precision molding, state-of-the-art oxygen-fired kilns, and comprehensive mechanical-electrical quality testing protocols.
Serve the world-class power grid with dedication. Actively participate in the construction of green energy pathways, researching ultra-high mechanical stress isolators for offshore wind farms and mountainous clean energy grid integrations.
Responsibility is the absolute guarantee of quality. Every glass shell undergoes thermal shock testing and mechanical load test runs to eliminate defective components before they leave the factory floor.
Serve the global electric power industry and ensure continuous, reliable safety of the grid. Our engineers provide remote and on-site support to local power agencies, assisting in customized product configurations.
Our design library covers multiple variations of standard, fog, open, and shed configurations. Below is an engineering overview of each design profile and its exact functional purpose.
The characteristic of the standard profile is that the leakage distance is higher than the value indicated for standard insulators in IEC 60305. The insulation part is designed with shallow and well-spaced small ribs, which can be effectively self-cleaned by wind or rain, making it ideal for clean rural and low-pollution metropolitan areas.
The fog type profile is characterized by long and widely-spaced under-ribs so as to avoid arc bridging between adjacent ribs. It features a leakage distance/spacing ratio of around 3.2 and is particularly effective in coastal areas (Salt fog) as well as in polluted areas where a higher specific leakage distance is required.
Design of insulating part with open profile is marked by absence of under-ribs and extended diameter of disk, with no under-ribs so as to avoid the accumulation of solid pollution deposits (dust, sand) on its lower surface. Open profile reduces pollutant accumulation on the surface. This design is effective in desert areas with wind and sand storms, and can solve ice-bridging problems.
The design of the insulation part has two external ribs. The elimination of the under-ribs reduces pollution build-up, and the surface of the insulator can self-clean by strong winds, and facilitate manual cleaning when necessary. This profile provides a leakage distance equivalent to the anti-pollution profile and adapts to extreme industrial pollution.
Triple-shed Type glass insulator is characterized by three layers of umbrella discs separated from each other on the insulation body. Thanks to this open shed design, they achieve self-cleaning during wind and rain and provide a longer creepage distance. This results in excellent pollution flashover resistance and stable electrical performance in heavily polluted areas, high altitudes, and coastal humid regions.
By connecting internal or external metal accessories (such as steel feet and flanges) to the grounding wire, reliable grounding can be achieved. The grounding function effectively guides lightning current, reduces line lightning damage, and protects the safety of lines and equipment. The glass surface is smooth and has low hydrophilicity, making it easy to remove dirt.
Silicone-coated insulators guarantee optimum performance for high-voltage overhead lines in areas with heavy pollution. They minimize leaking currents and reduce operation and maintenance costs. The product used to coat the insulators is Room Temperature Vulcanization (RTV) silicone. This silicone increases the hydrophobic nature of the insulator’s surface, improving its performance in polluted areas. The fillers absorb the energy of any possible electric arcs and protect the integrity of the coating.
Jiangxi QOCI Electric Co., Ltd. resides within Luxi County, Pingxiang, Jiangxi Province. This geographic region is widely recognized as the premier Chinese hub for electrical insulation materials. The resulting industrial cluster provides three major competitive advantages:
The factory utilizes precision-controlled annealing ovens and thermal shock chambers. Every batch of U420blp glass shells is subjected to temperature differentials of over 70°C to guarantee structural stability against extreme atmospheric shifts.
Our products are mainly high-strength glass insulators used in low voltage, high voltage, ultra-high voltage, extra-high voltage AC (DC) electric transmission lines.
Engineered for coastal zones with high saline humidity and inland valleys subject to freezing weather patterns.
Designed to match voltage ratings ranging from 10kV distribution grids up to 1000kV UHV transmission systems.
Configured to provide high mechanical load carrying support on tension towers and dead-end structural locations.
Special installations in heavy chemical industry parks and railway catenary grids requiring specialized creepage profiles.
To qualify for use in global utility grids, our glass isolators undergo extensive third-party testing in accordance with IEC and ANSI requirements.
Large grid projects require strict technical conformity. QOCI supports regional EPC contractors and state-level power operators with a full documentation package including routine type test certificates, chemical assay validations of the raw batch materials, and mechanical fail-safe calculations.
We collaborate with internationally recognized high-voltage laboratories to conduct pre-shipment verification. Additionally, our customized zinc sleeve integration protects the pin base from galvanic erosion—an essential requirement for grids operating in coastal regions.
Quality assurance is backed by global testing authorities and standard systems.
Through our specialized distributors and direct EPC partnerships, our products are installed across grid developments worldwide. Our partners benefit from stable mechanical performance, fast shipping times, and comprehensive quality control.
As the global energy transition accelerates, the importance of electricity, renewable energy, and energy storage technologies is becoming increasingly clear. QOCI will showcase our latest U420blp and RTV-coated suspension glass isolator series designed for African regional grids, improving reliability in desert dust and heavy lightning zones.
Having withstood extreme environmental conditions including icing, high altitude, pollution, earthquakes and typhoons, China's insulator industry is setting new global reliability standards.
QOCI Electric will highlight our certified glass isolators and new high-strength 420kN lines designed for long span river crossings and heavy ice loads in North American transmission corridors.
QOCI Electric, a leading global supplier of power equipment and solutions, officially confirmed attendance to showcase specialized desert anti-sandstorm glass isolators.
Our extensive product lines include anti-pollution, double-shed, standard, and custom industrial-grade glass isolators.
