Weshare Electrical Laminated Wood Series | Full Product Guide & Industry Knowledge

Published by Weshare | Professional Electrical Insulation Material Supplier | Focus on Transformer & Electric Locomotive Insulation Solutions

Introduction

Weshare is a professional manufacturer specializing in the R&D, production and customization of electrical laminated wood products. Our product series covers ordinary electrical laminated wood boards, 7° scarf-jointed laminated wood boards, X-shape one-time pressed transformer pressure rings, and laminated wood screws & nuts. All products are precision-manufactured to meet the insulation and structural support needs of medium, high and ultra-high voltage electrical equipment such as power transformers, instrument transformers, traction transformers, and electric locomotives. With advanced production technology, strict quality control and professional customization capabilities, Weshare has become a reliable partner for global customers in the electrical insulation field.

1. Ordinary Electrical Laminated Wood Board

1.1 Product Overview

Electrical laminated wood board is a high-performance insulating and supporting material widely used in power transformers and instrument transformers. It is made from premium birch veneers through a strict manufacturing process: cooking, rotary cutting, and drying to produce uniform veneers, followed by coating with special insulating adhesive, and finally high-temperature, high-pressure pressing into solid, durable boards.

1.2 Core Advantages

Moderate specific gravity: Lightweight yet robust, helping reduce overall equipment weight

High mechanical strength: Excellent compression, flexural, and tensile strength

Easy vacuum drying: Suitable for transformer manufacturing processes

Excellent machinability: Easily cut, drilled, and milled into complex shapes

Matched dielectric constant: Close to transformer oil, ensuring optimal insulation coordination

Long-term thermal stability: Continuous operation at 105℃ in transformer oil

1.3 Key Applications

Electrical laminated wood board has replaced traditional materials (steel plates, insulating paperboards, epoxy paperboards, and epoxy glass cloth laminates) in numerous transformer components, reducing both equipment weight and material costs.

Oil-immersed transformers: Upper/lower pressure plates, lead brackets, yoke spacer blocks

Instrument transformers: Clamps and structural supports

Custom machined parts: Tailored components for specific transformer designs

1.4 Flatness & Surface Quality Standards

1.4.1 Boards Flatness (Unit: mm)

1.4.2 Surface Quality Standard

1.5 Standard Specifications

1.5.1 Maximum Size (Length × Width × Thickness)

4000 × 3000 × 120 mm

1.5.2 Common Stock Sizes (Length × Width × Thickness)

*Custom sizes and special thicknesses are available upon request.*

2. 7° Scarf-Jointed Electrical Laminated Wood Board

2.1 Difference Between Ordinary & 7° Scarf-Jointed Laminated Wood

Traditional ordinary electrical laminated wood adopts lap joint connection between veneers of the same layer. This simple connecting method inevitably causes inherent structural defects, including uneven density distribution, unbalanced internal stress, residual air holes and delamination risks inside the board. These hidden defects will gradually expand under long-term high voltage, vibration and oil immersion environment, affecting mechanical stability and insulation performance.

To solve the above pain points, Weshare introduces advanced domestic veneer grinding and lengthening production units. All single veneers are precisely polished and processed, then connected integrally at a 7° scarf joint angle to realize integral whole-size veneer molding without broken joints.

2.1.1 Advantages of 7° Scarf-Jointed Laminated Wood

Uniform overall density with no local loose or dense areas

Balanced internal stress, not easy to deform or crack

No internal air holes, improving overall compactness

Higher mechanical strength, compression resistance and bending resistance

More stable electrical insulation performance and lower partial discharge rate

Stronger structural integrity, suitable for long-term high-load operation

With upgraded comprehensive performance, Weshare scarf-jointed laminated wood fully meets the strict technical standards of high-voltage and ultra-high-voltage transformers.

2.2 Application Matching for 35kV / 110kV / 230kV Power Transformers

2.2.1 35kV Grade - Ordinary Electrical Laminated Wood

35kV belongs to medium-voltage power distribution transformer. Working load, electromagnetic force and insulation margin are relatively moderate.

Applicable Equipment: Distribution transformers, factory industrial transformers, urban and rural power grid conventional oil-immersed transformers.

Matching Components: Yoke cushion blocks, common support parts, ordinary clamping plates, simple internal fixing structural parts.

Reason: Ordinary lap-jointed laminated wood meets basic mechanical strength and conventional insulation requirements, cost-effective and fully qualified for medium-voltage daily operation.

2.2.2 110kV Grade - 7° Scarf-Jointed Laminated Wood

110kV is mainstream high-voltage transmission transformer, with high requirements for insulation stability, vibration resistance and structural safety.

Applicable Equipment: Regional power grid main transformers, substation core transformers, traction supporting transformers.

Matching Components: Upper and lower pressure plates, lead wire brackets, key winding support blocks, high-voltage end positioning parts.

Reason: Long-term operation under strong electromagnetic vibration; the 7° integral scarf joint structure eliminates air holes and stress defects, ensures stable insulation coordination with transformer oil, effectively prevents partial discharge, and greatly improves operation safety and service life.

2.2.3 230kV Grade - High-Strength Thickened Scarf-Jointed Laminated Wood

230kV belongs to ultra-high voltage power transmission equipment, with extremely strict standards for material compactness, mechanical uniformity and high-voltage insulation durability.

Applicable Equipment: Large regional power hub substations, long-distance power transmission main transformers, heavy-duty industrial high-voltage transformers.

Matching Components: Ultra-thick pressure rings, heavy-load pressure plates, core key insulation supports, main winding fixed structural parts.

Reason: Ultra-high voltage environment requires zero internal air gaps and overall uniform stress. Weshare whole-piece scarf-jointed laminated wood with integral molding features high density, overall consistent mechanical performance, excellent high-voltage aging resistance, and can operate stably in harsh ultra-high voltage and temperature cycle working conditions for a long time.

2.3 Standard Specifications

2.3.1 Maximum Overall Size

4000 × 3000 × 120 mm

2.3.2 Regular Common Sizes

Custom length, width, thickness and CNC customized shaped parts are available according to customer drawings.

3. X-Shape One-Time Pressed Transformer Pressure Ring

3.1 Product Overview

Pressure rings are critical insulating components in transformers, requiring high mechanical and electrical performance. Traditional laminated wood pressure rings are processed from standard boards, where veneers are stacked with perpendicular fiber directions. This causes significant variation in vertical bending strength along the radial direction, with a maximum deviation of 70%, which is disadvantageous for resisting electrodynamic forces and ensuring transformer safety.

3.2 Weshare Innovative Technology

Weshare has developed a patented one-time forming process for pressure rings (Patent No.: ZL 02 1 16076.7):

Veneers are arranged with an "X" fiber orientation along the radial direction

One-time hot pressing into circular blanks

Precision machining via CNC woodworking centers

3.3 Key Features

High overall mechanical strength and elastic modulus

Uniform vertical bending strength at all radial points

For rings with density ≥1.1 g/cm³, radial bending strength exceeds 120 MPa

Maximum finished diameter up to 2400mm (customizable)

Excellent anti-vibration and anti-loosening performance, suitable for harsh working environments

3.4 Applications

Widely used in high-voltage and ultra-high-voltage transformers, including power transformers, traction transformers for electric locomotives, and industrial high-voltage transformers, as core coil clamping components to resist electromagnetic forces and ensure stable operation.

4. Laminated Wood Screws & Nuts

4.1 Product Overview

Weshare laminated wood screws & nuts are precision custom fasteners made of high-quality electrical laminated wood through professional molding, CNC precision machining, and post-processing. They are a new type of composite fastening component that integrates fastening, insulation, and load-bearing functions, and are mainly used in the internal fastening of high-voltage electrical equipment such as transformers and electric locomotives-where both reliable fastening performance and excellent insulation performance are required.

4.2 Core Material Advantages

Excellent insulation performance: Applicable to 110kV+ high-voltage environments, dielectric constant close to transformer oil

High mechanical strength: Can bear sufficient fastening force, anti-vibration and anti-deformation

Lightweight & cost-effective: Reduce equipment weight and procurement cost compared with metal fasteners

Good oil compatibility & thermal stability: Can operate continuously at 105℃ in transformer oil

Corrosion resistance & non-magnetic: No rust, no interference with transformer electromagnetic field

4.3 Precision Processing Technology

The processing process includes raw material pretreatment, adhesive coating & veneer stacking, hot press forming, CNC precision machining, post-processing & finishing, and strict quality inspection. Key highlights:

CNC precision machining: Thread accuracy up to 6H, dimensional tolerance within ±0.1mm

Optional anti-loosening treatment: Resin coating on thread surface to resist vibration and loosening

Strict quality control: Full inspection of mechanical strength, insulation performance and oil compatibility

4.4 Applications

Electric locomotives: Traction transformers, auxiliary transformers, onboard electrical cabinets

Power transformers: Fastening of pressure rings, spacer blocks, insulating plates

High-voltage electrical equipment: Internal fastening and insulation components

5. Weshare Core Competitiveness

Full Product Line: Covering ordinary laminated wood, scarf-jointed laminated wood, X-shape pressure rings, and laminated wood screws & nuts to meet diverse customer needs

Advanced Technology: 7° scarf joint, X-shape one-time pressing, CNC precision machining, ensuring product quality and performance

Strict Quality Control: Multiple inspection points from raw material to finished product, with real-time parameter recording and quality tracing

Professional Customization: Support custom sizes, specifications, shapes and performance requirements, one-stop solution supply

Industry Experience: Deep understanding of transformer and electric locomotive industry needs, reliable product and service

Contact Weshare

For technical data sheets, mechanical test reports, samples, or custom quotes, please contact the Weshare sales team. We provide one-stop solutions for all your electrical insulation wood needs, supporting wholesale, OEM and project bulk orders.