Engineered for high performance, structural resilience, and ultimate reliability across standard and extreme overhead line grid installations.
Founded in December 2002, Jiangxi QOCI Electric Co., Ltd. has established itself as an international benchmark for grid reliability. With a registered capital of 508 million Yuan, our sprawling manufacturing facility resides in the Industrial Park of Luxi County, Pingxiang, Jiangxi Province, spanning an area of over 100 mu (70,000 m²).
We combine advanced production infrastructure with rigorous quality management models. Our engineering capabilities focus on delivering optimal price-to-performance options, securing short lead times, and achieving superior electrical safety profiles for transmission, distribution, and substation operations globally.
Through technological dedication, we actively support the development of green energy infrastructures, offering durable solutions for low-voltage, high-voltage, extra-high-voltage (EHV), and ultra-high-voltage (UHV) AC & DC systems.
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Invention & New Utility Patents
A comprehensive examination of engineering parameters, material physics, and application profiles of the industry-standard U70BLD suspension glass disc insulators.
The U70BLD suspension tempered glass disc insulator is a specialized high-voltage component designed under strict IEC and ANSI standards. Crucially, the "U70" designation signifies a nominal electromechanical failing load rating of 70 kN, which provides the critical mechanical support needed to hold heavy conductor bundles. The code suffix, such as "BLD", denotes the standard ball-and-socket connection parameters (specifically conforming to Ball & Socket coupling type) and profile geometry designed to offer specialized creepage performance.
Our toughened glass formulation undergoes a specialized heat treatment process. This process induces permanent compressive stress on the outer glass shell while creating a highly balanced tensile zone within the inner core. As a result, the insulator is remarkably resistant to mechanical impact and thermal shock.
If electrical flashovers or catastrophic mechanical impacts occur, the pre-stressed glass shell shatters into tiny, non-sharp fragments. This unique failure mode is known as "safe shattering," which provides immediate visual confirmation of damage for maintenance crews without compromising the physical integrity of the insulator string.
| Parameters | U70BLD Specification Standard |
|---|---|
| Electro-Mechanical Failing Load | 70 kN |
| Coupling Size & Type | 16 mm Ball & Socket (IEC 60120) |
| Nominal Spacing (Height) | 127 mm / 146 mm |
| Disc Diameter | 255 mm |
| Standard Creepage Distance | 295 mm / 320 mm / 450 mm (Anti-pollution variations) |
| Power Frequency Withstand Voltage (Wet) | 40 kV - 45 kV |
| Lightning Impulse Withstand Voltage | 100 kV - 110 kV |
Matching critical terrain and environmental challenges with specialized toughened glass geometries.
Features shallow, well-spaced ribs that promote natural self-cleaning via rain and wind. Best suited for environments with light contamination where natural cleaning keeps maintenance costs minimal.
Engineered with deeper under-ribs to maximize total leakage distance. This design prevents electrical bridging caused by damp conditions, making it ideal for coastal regions exposed to heavy salt fog.
Designed with a ribless, flat underside to prevent sand and dust accumulation. This shape helps prevent pollution build-up, making it highly effective in arid desert terrains prone to wind and sandstorms.
Understanding the demands of clean energy integration, grid modernization, and infrastructure longevity.
Power transmission grids worldwide are undergoing major transformations. The rapid expansion of high-voltage direct current (HVDC) systems and ultra-high voltage (UHV) transmission networks is being driven by the need to integrate remote clean energy sources like solar, wind, and hydro power.
Modern networks operate under high load, which places strict demands on structural stability. High-performance mechanical components like the U70BLD series are essential for safeguarding these systems. Utility companies are increasingly choosing toughened glass over traditional porcelain due to its superior durability and lower lifecycle maintenance costs.
Furthermore, unpredictable weather patterns—such as intense typhoons, severe winter ice loading, and extreme heatwaves—require structural components that can reliably withstand thermal and mechanical stress. The predictable failure mode of toughened glass, combined with its high mechanical stability, ensures it remains a preferred option for grid operators globally.
Our toughened glass units are designed to withstand rapid temperature swings of up to 100°C without mechanical failure. This performance is vital in regions that experience sharp day-night temperature changes, such as high-altitude environments and arid deserts.
Reliable operations prevent flashover events in heavily polluted industrial areas and chemical zones. By choosing glass insulators with extended creepage profiles, operators can avoid costly unplanned outages.
For regions with severe environmental contamination, we offer Room Temperature Vulcanization (RTV) silicone-coated glass insulators. The hydrophobic coating helps prevent leakage currents and reduces the need for regular manual cleaning.
These specialized designs utilize complex profiles with alternating disc diameters. The configuration breaks up water run-off, which helps prevent ice-bridging and flashover events during winter freezing and heavy rains.
Connecting generation facilities and end consumers with reliable transmission infrastructure, regardless of terrain challenges.
Our vertically integrated manufacturing facility ensures complete control over raw materials, precise molding, and final product testing.
Ensures uniform structural density and precise dimensional tolerances.
Builds high inner compressive stress for maximum mechanical strength.
Mixes pure quartz, feldspar, and soda ash for high-purity glass.
Subjected to high-voltage stress testing to prevent field failures.
Premium mineral supplies ensure batch consistency and stability.
Eco-friendly combustion provides stable melting, reducing micro-bubbles.
Our manufacturing and quality systems align with ISO, IEC, ANSI, and regional grid standards.
Collaborating with electrical utilities, EPC contractors, and global power grid authorities to keep high-voltage lines running smoothly.
Find out where we are participating in international energy events and get updates on the latest insulator technology advancements.
As the global energy transition accelerates, the importance of robust electricity networks and transmission hardware continues to grow. We showcased our latest anti-pollution glass insulation products designed for challenging environmental conditions.
China's insulator industry has built high reliability by handling diverse extreme conditions, including high icing, altitudes, coastal salinity, earthquakes, and typhoons.
We invite you to connect with the Jiangxi QOCI Electric team at the 2026 IEEE PES T&D Conference to discuss high-voltage insulation innovations.
QOCI Electric confirmed its participation in the Iraq Energy Exhibition, showcasing regional glass insulation solutions designed for hot and dusty environments.
Developing next-generation insulation systems designed to improve efficiency, reduce carbon footprints, and integrate with smart power grids.
By using total oxygen melting kilns and natural gas fuel systems, we reduce carbon emissions during raw glass fabrication. Our goal is to achieve carbon-neutral production processes.
We are researching real-time monitoring systems that integrate sensors directly into the metallic fittings of glass insulator discs. This technology helps detect early leakage currents and trace faults.
By combining physical double-shed geometries with durable hydrophobic surface treatments, we aim to design insulators that prevent ice accumulation in cold regions.
Quick answers to common questions about selecting, purchasing, and applying U70BLD toughened glass insulators.
Standard U70BL uses conventional spacing profiles suited for areas with light contamination. The "D" in U70BLD typically designates a double-shed or specialized anti-pollution disc geometry. This design increases the creepage path, providing better protection against flashovers in high-contamination environments.
Tempered glass insulators simplify maintenance through a visual inspection system. When an insulator fails, it shatters in place but keeps its mechanical holding capacity. Maintenance crews can easily spot damaged units from the ground, removing the need for complex testing procedures.
Every production batch is tested in accordance with IEC 60383 and IEC 60305 standards. This includes mechanical failing load tests, steep-front impulse voltage tests, thermal shock cycle tests, and dimension checks. These tests ensure the insulators perform reliably on high-voltage transmission lines.
Yes. We manufacture both standard profiles and specialized variations with creepage distances up to 450 mm and higher. Additionally, we apply factory-cured RTV silicone coatings to improve performance in coastal or highly polluted industrial locations.
Explore our wider range of suspension disc, pin, spool, and low-voltage shackle insulator components.
