High Voltage Dry Wall Bushing 12kV-252kV

Overview of Dry-Type Wall Bushings

A high-voltage dry-type wall bushing is a specialized, liquid-free insulation device engineered for safe wall penetrations in power substations and industrial facilities. Utilizing solid dielectric materials, primarily epoxy resin and silicone rubber, these bushings eliminate the risks associated with traditional oil-filled alternatives, such as oil leakage or fire hazards. They are designed to support stable power transmission across various infrastructure setups. The common voltage classes for these solid insulation bushings include 72.5kV, 126kV, 172kV, 252kV, and 363kV, making them highly adaptable for diverse grid requirements.

Types of Wall Bushings: Polymer vs. Porcelain

Selecting the right insulation material is critical for ensuring long-term operational stability. There are different types of wall bushings available, each suited for specific environmental conditions and project applications. The most common types include:

A. Polymer Wall Bushings

Constructed with an epoxy resin core and a silicone rubber housing, polymer wall bushings are highly versatile and durable. They are suitable for both indoor and outdoor use. The silicone rubber sheds provide reliable hydrophobicity, which significantly reduces the risk of pollution flashover in heavily contaminated environments. Additionally, they provide stable insulation, can withstand high temperatures, and offer strong seismic performance due to their flexible nature.

B. Porcelain Wall Bushings

Porcelain wall bushings feature a solid insulation core protected by a high-strength ceramic housing. These are widely used in commercial and heavy industrial settings, as they offer high mechanical strength and outstanding resistance to heat, UV radiation, and harsh chemicals. Porcelain remains a trusted choice for installations requiring rigid structural support and long-term durability under extreme weathering conditions.

Key Physical Characteristics

The transition to solid dielectric materials brings several structural and operational advantages to electrical infrastructure:

• Maintenance-free: The absence of insulating oil means there is no need for regular oil level inspections, dissolved gas analysis, or leak repairs, significantly reducing ongoing operational costs.
• Eco-friendly: Liquid-free construction prevents soil and water contamination risks, aligning with modern environmental protection standards and eliminating fire hazards during operation.
• Lightweight: Compared to traditional oil-impregnated paper (OIP) bushings, dry-type designs are notably lighter. This reduces the mechanical stress on mounting walls and simplifies transportation and installation procedures.

Electrical Performance Indicators

These dry wall bushings are engineered to deliver reliable electrical insulation and thermal stability under demanding operational conditions. The core electrical performance metrics include:

• Voltage rating: 12kV~252kV
• Lightning impulse withstand: 75kV (12kV) / 950kV (252kV), ensuring strong protection against transient overvoltages.
• Partial discharge: <5pC, indicating a highly uniform internal insulation structure with minimal voids, which extends the operational lifespan.
• Operating temperature: -50℃~+130℃ (special models available for extreme environments up to +180℃), guaranteeing stable performance across severe climate variations.

Key Technical Parameters

The following table outlines the detailed technical specifications for the high-voltage wall bushings. All parameters are tested and verified in strict accordance with the IEC 60137 - 2017 standard to ensure procurement reliability.

NJREC GROUP has established a robust global footprint, successfully delivering reliable power infrastructure components worldwide. To date, our products have already exported to North America, South America, Australia, Southeast Asia, Africa, Europe and 50 other countries and regions. This extensive international presence demonstrates our capacity to meet diverse regional demands, adapting to various environmental conditions and grid requirements. Whether for modernizing urban power networks or expanding rural electrification, our global reach underscores the trust international procurement teams place in our brand.

Broad Industry Applications

Our Transformer Bushings and Insulators are engineered to support critical power transmission and distribution systems. These components serve as essential solutions for a wide range of applications, including utility substations, commercial power facilities, heavy industrial plants, and renewable energy integration projects. By providing secure electrical insulation and structural support, they ensure the safe operation of transformers and switchgear equipment across different operational environments. Procurement managers and EPC contractors rely on our components to maintain grid stability and prevent costly downtime.

Compliance with International Standards

Quality assurance and regulatory compliance are at the core of our manufacturing process. All Transformer Bushings and Insulators manufactured by NJREC correspond to the international standards as referred to their quality. This commitment to compliance ensures that our products seamlessly integrate into global power systems, offering consistent performance and long-term reliability. For international buyers, this means reduced project risks, simplified quality audits, and the assurance that every component will perform safely under demanding electrical loads.

Core Commercial Advantages

Beyond technical reliability, NJREC GROUP is dedicated to delivering exceptional commercial value. We understand that large-scale infrastructure projects and equipment manufacturing require strict budget management. Therefore, our Transformer Bushings and Insulators are in the market at the most competitive prices. By optimizing our production efficiency and supply chain management, we provide cost-effective procurement solutions without compromising on quality. Partnering with NJREC ensures that clients receive premium insulation products that enhance project profitability and support sustainable business growth.