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Email： sales@njrecgroup.com
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Nanjing Rainbow Electric Co., Ltd. (NJREC) stands as a premier manufacturer and supplier of electrical insulators and transformer bushings in China, deeply rooted in advancing power grid infrastructure. Specializing in highly dependable electrical insulators for transmission lines and substations, NJREC engineers products meticulously tailored to meet stringent international industry standards. Beyond individual components, the company delivers comprehensive, one-stop solutions encompassing distribution transformers, large-scale power transformers, pad-mounted units, and specialized wall-mounted applications. Our manufacturing facilities utilize rigorous testing protocols and precise material selection to ensure every component contributes to efficient and safe power system operations. By focusing on long-term structural integrity and precise electrical grading, we empower utility operators and industrial facilities to maintain continuous energy flow, minimize unexpected downtime, and optimize their overall grid performance across demanding environmental conditions.
Through decades of engineering expertise, we have developed a resilient supply chain network capable of delivering predictable, rapid turnaround times for both standard and highly specialized orders, ensuring your critical infrastructure projects remain on schedule.
Oil-Impregnated Paper (OIP) Condenser Wall Bushings serve as critical high-voltage insulation components for modern power systems, widely integrated into transformers and heavy-duty switchgear. Compared with standard Epoxy Resin Bushings, OIP Bushings boast significantly higher voltage tolerance and superior dielectric strength, with common voltage classes covering 72.5kV, 145kV, 252kV, 363kV, 420kV, and up to 550kV.
Core Structure & Materials: Featuring a highly conductive central conductor wrapped in premium condenser-graded paper cores, enclosed within a high-strength insulating envelope for exceptional mechanical support and long-term durability.
Electrical Stress Control: By utilizing finely tuned capacitance layers, these bushings evenly distribute electrical field stress, allowing them to effortlessly handle lightning surges and sudden voltage spikes, thereby safeguarding grid stability under extreme conditions.
Safety Protection Mechanisms: The advanced OIP insulation technology incorporates a reliable grounding shield barrier that actively suppresses partial discharge, addressing root vulnerabilities and preventing risks associated with transformer short circuits or thermal runaway.
Lifespan Optimization: Engineered for an extended 20 to 30-year operational lifecycle, this equipment supports proactive condition monitoring and preventive maintenance strategies that drastically reduce the total cost of ownership (TCO).
The precise engineering behind these parameters guarantees stable operation across diverse thermal and electrical load variations. Every specification is meticulously verified through rigorous factory acceptance testing to ensure absolute compliance with international safety frameworks.
Maximum operating voltage (50/60Hz) | 225kV |
Rated Current | 1250A |
One minute power frequency withstand voltage(dry) | 505kV |
Partial discharge level at Um | ≤10pC |
Lightning impulse withstand voltage(dry) | 1050kV |
Creepage distance | ≧7812mm |
Installation angle | 0-30° |
Cantilever test load | 2000N |
Type of conductor | Draw lead |
Internal insulation | OIP |
Comply with standard | IEC60137 |
OIP Condenser Bushing | 40.5kV ~2000kV OIP Condenser Transformer/Reactor Bushing |
40.5kV ~800kV OIP Condenser Transformer/Reactor Bushing with composite envelope | |
40.5kV ~252kV Oil-Oil OIP Condenser Transformer Bushing | |
126kV ~550kV Oil-SF6 OIP Condenser Transformer Bushing | |
24kV ~40.5kV Heavy Current OIP Transformer Bushing | |
72.5kV ~800kV OIP Condenser Wall Bushing |
Our comprehensive portfolio of OIP Condenser Bushings covers a wide spectrum of voltage requirements and structural configurations to accommodate diverse infrastructure demands. From standard 40.5kV transformer bushings to ultra-high-voltage 2000kV applications, each variant is engineered with precise capacitance grading. The selection includes specialized composite envelope designs for enhanced pollution resistance, Oil-Oil configurations for specific internal transformer routing, and Oil-SF6 hybrid bushings tailored for gas-insulated switchgear connections. Heavy current variants are also available to handle intense load requirements without excessive thermal buildup, ensuring optimal energy transfer across all operational phases.
Understanding that no two power grids are identical, we offer extensive customization services for our OIP Condenser Bushings to perfectly match specific dimensional and electrical requirements. Our engineering team collaborates closely with clients to develop tailored retrofit solutions that smoothly integrate with major transformer and switchgear brands. Whether you are upgrading aging grid infrastructure or designing a newly commissioned substation, our custom-engineered bushings provide a hassle-free installation process and a flawless upgrade path. We meticulously analyze your existing flange dimensions, draw lead specifications, and spatial constraints to produce precise technical drawings and prototypes. This bespoke approach eliminates the need for costly modifications to your existing heavy equipment, ensuring a smooth transition, reduced installation time, and immediately improved dielectric performance for your critical assets.
The OIP Condenser Bushing is a reliable and high-performance component, well-suited for diverse scenarios in the high-voltage electrical sector, delivering exceptional insulation and structural stability to guarantee secure and seamless power transmission and distribution operations. Inside our advanced manufacturing facility, the air carries the distinct, clean scent of specialized dielectric fluids and refined kraft paper, hallmarks of premium OIP production. Skilled technicians operate precision winding machines, carefully layering the conductive foils and insulating paper to form the critical condenser core. You can hear the steady hum of vacuum drying ovens where moisture is meticulously extracted from the paper layers before the deep oil impregnation process begins. The sleek, cool touch of the finished porcelain or composite outer shells reflects the rigorous quality control applied to every unit, guaranteeing that each bushing meets the highest operational standards.
Used globally in power systems across North America, South America, Australia, Southeast Asia, Africa, Europe, and over 50 regions. Meets international quality standards at competitive prices, outperforming products with higher costs or lower reliability.
These components are routinely deployed in step-up transformers at generation plants, ensuring that the massive energy output is safely insulated and directed into the transmission grid without electrical breakdown.
In massive autotransformers and critical tie-lines connecting diverse grid networks, their durable construction allows them to endure harsh environmental conditions. From freezing coastal winds to scorching desert heat, they maintain stable internal temperatures and prevent flashovers.
Choose Nanjing Rainbow Electric Co. for reliable, durable, and cost-effective solutions that comply with international standards, meeting the needs of expanding infrastructures. By ensuring continuous operation in these demanding applications, our bushings help utility providers avoid catastrophic outages and maintain the steady flow of electricity required for modern industrial and residential demands.
Proper packaging is crucial for preserving the intricate internal structure and fragile outer envelope of high-voltage bushings during transit. We utilize heavy-duty, custom-fitted wooden crates reinforced with steel banding to completely immobilize the OIP Condenser Bushings. Inside the crate, thick layers of shock-absorbing foam and vibration-dampening materials cradle the porcelain or composite housing, protecting it from sudden impacts and mechanical stress. The mounting flanges and sensitive connection terminals are wrapped in specialized moisture-barrier materials to prevent oxidation and contamination from dust or sea salt during long-distance ocean freight. This meticulous attention to packaging ensures that every unit arrives at your installation site in pristine condition, ready for immediate deployment.
NJREC has built a good reputation for dependable products, timely delivery and responsive customer service. And has kept its development process, considering his responsibilities and missions about being one of the esteemed and respectful companies in the transformer bushing, transmission line and substation industry. Our commitment to excellence is validated by a comprehensive suite of international certifications, including ISO quality management systems and rigorous third-party type test reports from internationally recognized laboratories. These credentials serve as a testament to our unwavering dedication to electrical safety, environmental compliance, and continuous operational improvement. By adhering to these strict regulatory frameworks, we provide our clients with absolute confidence in the mechanical and electrical integrity of our insulation components.
Our extensive client base spans multinational utility companies, regional grid operators, and major heavy-industry manufacturers who rely on uninterrupted power delivery. By fostering long-term partnerships, we have developed a deep understanding of the unique operational challenges faced across different geographical regions. We back our physical products with round-the-clock technical support, comprehensive installation guidance, and a rapid-response spare parts network. This dedicated global service ensures that whenever technical consultations or urgent replacements are required, our engineering experts are readily available to assist, empowering our customers to build more resilient and future-proof power networks.
