20kV 3150A Porcelain Wall Bushing

High-Current Indoor & Outdoor Power Distribution Bushing

The 20kV 3150A Porcelain Wall Bushing is designed to provide safe and reliable insulation and current transmission through walls, partitions, and electrical enclosures in medium-voltage power systems. Manufactured with high-strength glazed porcelain and high-conductivity copper or aluminum conductors, the bushing ensures excellent electrical performance, mechanical strength, and long service life under demanding operating conditions.

Widely used in substations, switchgear, transformer stations, and industrial power distribution systems, the wall bushing enables secure conductor passage while maintaining insulation integrity between different compartments.

Product Features

High Current Carrying Capacity

Rated current up to 3150A for heavy-duty power transmission applications.

Premium Porcelain Insulator

Manufactured from high-quality electrical porcelain with excellent dielectric and mechanical properties.

Superior Insulation Performance

Provides reliable insulation for 20kV medium-voltage systems.

Corrosion-Resistant Hardware

Galvanized steel and copper alloy fittings ensure long-term outdoor durability.

High Mechanical Strength

Designed to withstand conductor tension, vibration, and installation stresses.

Long Service Life

Weather-resistant glazed surface minimizes contamination accumulation and maintenance requirements.

Easy Installation

Standard mounting flange design simplifies installation in substations and switchgear rooms.

Technical Specifications

Specifications can be customized according to project requirements.

Applications

• Medium-voltage substations
• Power transformer stations
• Ring main units (RMU)
• Metal-clad switchgear
• Industrial distribution systems
• Renewable energy substations
• Utility transmission and distribution projects

Construction

The wall bushing consists of:

• High-strength glazed porcelain insulator
• Copper or aluminum conductor rod
• Mounting flange assembly
• Galvanized fastening hardware
• Sealing components for moisture protection

The design ensures reliable electrical insulation while safely passing conductors through walls or barriers.

Advantages of Porcelain Wall Bushings

Excellent Insulation Performance

Porcelain provides stable dielectric properties over decades of service.

High Mechanical Reliability

Superior resistance to compression, bending, and environmental stress.

UV and Weather Resistant

Suitable for long-term outdoor installations.

Cost-Effective Solution

Lower lifecycle cost with proven field performance.

Quality Control

Each wall bushing undergoes:

• Power frequency withstand voltage test
• Partial discharge inspection
• Dimensional verification
• Mechanical strength test
• Visual glazing inspection
• Routine factory testing according to IEC standards

Why Choose Wolun Electric?

• Professional manufacturer of medium and high-voltage insulation products
• OEM & ODM service available
• Strict IEC quality control
• Competitive factory-direct pricing
• Fast delivery worldwide
• Technical support for utility and EPC projects

FAQ

What is a wall bushing used for?

A wall bushing allows conductors to safely pass through walls, barriers, or enclosures while maintaining electrical insulation.

Can the bushing be used outdoors?

Yes. The glazed porcelain housing is suitable for both indoor and outdoor applications.

Is customization available?

Yes. Current rating, creepage distance, mounting dimensions, and conductor material can be customized.

What standards does it comply with?

The product is manufactured according to IEC 60137 and relevant utility specifications.