300kN U300bd High Voltage Cap and Pin Type Toughened Double Shed Glass Electric Insulator

| Company Profile

Nanjing Rainbow Electric Co., Ltd. (NJREC) stands as a premier manufacturer and trusted supplier of advanced electrical insulators and transformer bushings. With decades of engineering excellence, NJREC delivers highly reliable electrical insulation solutions tailored for complex transmission lines and high-voltage substations. Our comprehensive portfolio extends to one-stop solutions for distribution and power transformers, pad-mounted systems, and specialized wall-mounted applications. We strictly adhere to international electrotechnical standards, including IEC 60383, GB/T 1001.1, and BS 3288. Backed by ISO 9001 quality management systems and certifications from internationally recognized bodies like Bureau Veritas (BV), our facilities ensure seamless global grid access. We empower infrastructure developers with components that guarantee uninterrupted power flow, maximizing operational uptime and significantly reducing lifecycle maintenance costs for large-scale energy projects across diverse geographic regions.

|  Product Introduction

As the critical linchpin for overhead power transmission systems, the 300kN U300BD High Voltage Cap and Pin Type Toughened Double Shed Glass Electric Insulator is meticulously engineered to deliver uncompromising electrical insulation and exceptional mechanical stability.

Core Materials & Component Synergy

The structural integrity of this insulator relies on a precise assembly of premium materials. It features a heavy-duty, hot-dip galvanized ductile iron cap paired with a forged steel pin, bound together by high-strength aluminate cement. This combination ensures remarkable mechanical resilience under extreme thermomechanical stress. Furthermore, the inclusion of stainless steel or phosphor bronze split pins provides a secure, corrosion-resistant locking mechanism that maintains its grip even after decades of exposure to harsh elements.

Advanced Structural Design & Anti-Flashover Principle

The U300BD utilizes a sophisticated double-shed cross-sectional profile. This unique geometry significantly extends the surface creepage distance, effectively dispersing the electric field intensity. By doing so, it drastically lowers the risk of localized discharges and prevents surface electrical corrosion. The smooth, angled toughened glass surface feels incredibly dense and features a natural self-cleaning property, allowing rainwater to swiftly wash away conductive dust and industrial pollutants.

Key Features & Benefits:

• ✔ Enhanced Electrical Insulation – The double-shed structure extends the surface leakage path, preventing flashovers caused by contamination and wet conditions.

• ✔ Superior Pollution Resistance – Ideal for medium to heavily polluted areas, reducing maintenance frequency compared to single-shed designs.

• ✔ Self-Cleaning Effect – Angled sheds promote rainwater runoff, minimizing dirt accumulation and sustaining long-term performance.

• ✔ Mechanical Durability – Manufactured from toughened glass, it withstands high mechanical loads, sudden impacts, and extreme weather conditions.

• ✔ Wide Application – Used in overhead transmission lines, substations, and transformer bushings, ensuring stable power flow and grid reliability.

| Data Sheet

When sourcing components for critical high-voltage infrastructure, precise technical specifications are the foundation of grid reliability. The following data sheet outlines the exacting parameters of our double-shed toughened glass insulators, including the U300BD model which boasts a formidable 300kN mechanical failing load and a generous 485mm creepage distance. These meticulously verified metrics ensure that engineering teams can accurately match our insulators to specific tower configurations, tension requirements, and environmental pollution levels. Every value listed below represents our commitment to absolute precision, ensuring that your transmission networks operate safely within their designed thermal and mechanical limits without compromise.

| Support Custom

Recognizing that no two transmission environments are identical, we offer extensive customization options to meet the unique demands of your specific grid infrastructure. Our engineering team fully supports OEM and ODM partnerships, working directly from your technical drawings to produce insulators that integrate flawlessly into your existing hardware. For environments plagued by heavy industrial pollution or coastal salt fog, we provide specialized anti-corrosion solutions. Clients can opt for custom zinc sleeves that act as a sacrificial anode, significantly extending the lifespan of the metal fittings by absorbing corrosive attacks. Additionally, we offer flexible hardware configurations, including the choice between W-type and R-type locking pins, ensuring that the installation process aligns perfectly with your regional maintenance protocols and operational preferences.

| Factory Pictures

Stepping onto the floor of our modernized manufacturing facility reveals a symphony of automated precision and industrial scale. The air hums with the steady rhythm of advanced machinery, while the intense, radiating heat from the glass tempering furnaces transforms raw silica into incredibly resilient dielectric components. Our production lines are highly automated, minimizing human error and ensuring absolute consistency across massive production runs. You can witness the glowing, molten glass being pressed into exact double-shed molds before undergoing a rapid, meticulously controlled cooling process that locks in its immense mechanical strength. This flawless integration of heavy industry and delicate precision engineering guarantees that every single insulator leaving our factory floor is a masterpiece of structural integrity, ready to withstand the harshest environmental extremes.

| Product Applications

The versatile double-shed toughened glass insulators are widely deployed across some of the most demanding power transmission and distribution projects worldwide. They serve as the critical barrier on high-voltage transmission towers and within complex substation architectures, effectively preventing electrical leakage and ensuring the stable, uninterrupted operation of vital power lines. Whether suspended high above varied terrains in long-distance overhead transmission networks or integrated into the dense internal wiring of a high-capacity substation, these insulators provide reliable, fail-safe insulation protection. Their unique aerodynamic profile makes them particularly invaluable in regions prone to heavy dust storms, seasonal monsoons, or severe industrial smog, where maintaining a clean surface leakage path is absolutely essential for preventing catastrophic grid flashovers and costly power outages.

| Products Packages

We understand that the journey from our production line to your installation site is fraught with logistical challenges, which is why our packaging protocols are engineered for maximum security. Every batch of toughened glass insulators is meticulously packed into premium, fumigation-free plywood boxes that strictly comply with international sea freight standards. Typically arranged in secure sets (such as 5 pieces per carton), each insulator is individually nested to prevent any micro-fractures or abrasive damage caused by transit vibrations. This robust packaging ensures that the products arrive in pristine, ready-to-install condition. Furthermore, we support your procurement cycle with clear minimum order quantities, highly flexible payment structures, and steadfast on-time delivery commitments, ensuring your large-scale construction schedules remain entirely uninterrupted.

| Testing Quality

Absolute reliability is non-negotiable in high-voltage infrastructure, which is why our comprehensive quality control system scrutinizes every stage of production. Relying on automated testing lines, we execute a rigorous sequence of evaluations. Before manufacturing even begins, raw materials undergo strict chemical composition and metallographic analysis to verify their fundamental purity. Once assembled, the finished insulators are subjected to brutal mechanical failing load tests, pushing them to their 300kN limits to guarantee structural safety. We employ advanced ultrasonic flaw detection to identify microscopic internal imperfections that could compromise performance. Finally, every batch must pass severe lightning impulse withstand voltage tests, simulating the most extreme atmospheric electrical strikes, ensuring that every single insulator delivered to your site is fundamentally zero-defect.

| Our Customers

Over the years, NJREC has cultivated deep, enduring partnerships with major grid operators, EPC contractors, and infrastructure developers across the globe. Our commitment to delivering uncompromising quality and highly responsive technical support has made us a preferred supplier in highly competitive international markets. We collaborate closely with procurement specialists and chief engineers to solve complex environmental and logistical challenges specific to their regional power networks. By consistently delivering robust, high-performance glass insulators that exceed operational expectations, we have built a legacy of trust. Our clients rely on our transparent communication, precise engineering, and unwavering dedication to helping them build safer, more efficient, and incredibly resilient power distribution systems for the future.