High-performance insulation solutions designed to withstand extreme mechanical loads and heavy environmental pollution.
In high-voltage (HV), extra-high voltage (EHV), and ultra-high voltage (UHV) systems, the stability of electrical systems relies heavily on the physical integrity of mechanical supports. **Post insulators** act as the primary mechanical anchors and electrical isolation barriers for busbars, disconnect switches, and substation structures.
At Jiangxi QOCI Electric Co. Ltd, we engineer state-of-the-art post insulators and toughened glass insulators that mitigate the risks associated with transient overvoltages, seismic stress, and severe atmospheric pollution. Our manufacturing processes utilize raw materials configured to resist cantilever deformation, torsional buckling, and environmental aging.
All components are verified in our laboratories under strict compliance with IEC 60305, IEC 60815, and ANSI C29 standards, ensuring high creepage distances and optimized shed profiles.
Backed by structural investment and modern manufacturing operations, QOCI ensures top-tier performance for critical grid infrastructure.
Established in December 2002 with a registered capital of 508 million Yuan, QOCI is located in the Industrial Park of Luxi County, Pingxiang City, Jiangxi Province. As an industry leader in one of China's primary electrical porcelain hubs, we specialize in high-strength glass and ceramic insulation designs.
Our core mission is to serve global utility networks, offering engineered reliability to mitigate system outages. We combine physical structural expertise with manufacturing processes to ensure every component leaving our facility can endure severe electrical and physical stress.
Optimized geometrical configurations customized to perform under diverse and challenging climatic conditions worldwide.
Designed with shallow, evenly spaced ribs to maximize aerodynamic self-cleaning via wind and rain. Creepage values exceed basic IEC 60305 provisions, making them ideal for temperate zones with low to moderate airborne dust.
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Featuring deep, widely-spaced under-ribs designed to prevent electrical arc bridging under wet or foggy conditions. Excellent leakage-to-spacing ratio (~3.2), optimized for saline marine atmospheres and coastal installations.
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Engineered without under-ribs to minimize the accumulation of dry industrial particles or desert sand. The flat, wind-swept lower surface prevents ice-bridging and reduces pollution buildup in arid and semi-arid zones.
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Features double external ribs to facilitate manual maintenance and wind-driven cleaning. Provides creepage distances comparable to anti-pollution models, making them suitable for severe industrial pollution and saline environments.
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Optimized with three independent, protective umbrella discs for critical transmission applications. This configuration prevents cascading electrical discharges, making it suitable for UHV/EHV networks operating at high altitudes.
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Features integrated grounding connections to safely route lighting strikes and transient surges, protecting line infrastructure. The smooth surface resists dirt accumulation, ensuring reliable grounding performance.
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Coated with Room Temperature Vulcanization (RTV) silicone. This coating provides hydrophobicity, keeping leakage currents low in polluted environments, and reduces the need for manual washing.
View ApplicationsHow QOCI post and suspension insulators support high-voltage infrastructure in diverse climates around the world.
Engineered to perform in environments ranging from sub-zero mountain ranges to hot desert regions. The glass formulations resist thermal shock (up to 100°C temperature shifts) and retain mechanical strength across seasonal changes.
Optimized for low, high, and ultra-high voltage AC and DC transmission networks. Tested to ensure low radio interference voltage (RIV) and corona performance, maintaining efficiency on busy transmission corridors.
Engineered for high mechanical reliability under mechanical strain. Designed to withstand wind loads, short-circuit forces, and seismic events, helping to secure electrical systems from unexpected outages.
Custom configurations designed for heavy chemical, metallurgical, and marine environments. Optional RTV coatings and specialized disc geometry provide performance in coastal or industrially polluted areas.
Behind every high-performance insulator is a precise, multi-stage production and verification protocol.
High-purity raw materials (silica, soda ash, feldspar) are blended to ensure chemical consistency and eliminate structural impurities in the glass melt.
Automated high-pressure presses shape the glass or ceramic bodies, establishing uniform thickness and clean geometric lines prior to heat treatment.
Our oxygen-fuel combustion furnace operates at stable high temperatures to melt glass with low energy consumption and minimal flue gas emissions.
Rapid thermal quenching creates high compressive stresses on the glass surface, providing resistance to mechanical impact and thermal shock.
Every insulator unit undergoes steep-front impulse, power-frequency, and mechanical load test runs to verify that electrical insulation holds under stress.
Caps and pins are assembled using high-grade cement formulas, securing the glass component and ensuring uniform mechanical stress distribution.
Addressing energy transition challenges with updated insulation materials and integrated performance monitoring.
Our ongoing R&D focus is the enhancement of RTV (Room Temperature Vulcanizing) silicone formulations. By integrating nano-fillers, we improve surface tracking resistance and prolong hydrophobicity retention under intense UV exposure and heavy industrial air pollution.
Developing prototype post insulators equipped with fiber-optic leakage current and temperature sensors. This technology supports predictive maintenance by providing real-time data on insulator condition, helping to prevent flashover events.
Transitioning our tempering lines and total oxygen kilns to include green hydrogen and clean electric heating systems, reducing the carbon footprint of our glass production.
Technical answers on post insulator design, material selection, and installation compliance.
Discover our comprehensive range of high-strength glass and porcelain insulators for transmission lines and distribution substations.
QOCI supports grid utilities, substation contractors, and high-voltage supply chains worldwide.
Stay updated on our product developments, international exhibitions, and technological advancements.
As the global energy transition accelerates, the importance of electricity, renewable energy, and energy storage technologies is becoming increasingly critical. We will present our high-voltage post and glass insulation solutions designed to support modern African grid infrastructure.
Read Full AnnouncementHaving withstood extreme environmental conditions including icing, high altitude, pollution, earthquakes, and typhoons, China's insulator industry delivers reliability for global grid operators.
On behalf of our team at Jiangxi QOCI Electric, we invite you to connect with us at the IEEE PES T&D Conference, the premier event for the power transmission and distribution industry.
Confirming our commitment to the Middle East, our technical delegation will exhibit our specialized dry-environment post insulators at the Iraq Energy Exhibition.