Main Transformer Web-Plate Structure Clamping Frame

This product is a specialized Web-Plate Structure Clamping Frame for large oil-immersed power transformers. It serves as the core load-bearing component within the transformer, responsible for supporting the windings and core, and withstanding short-circuit electromagnetic forces. The design features an integrated structure of high-strength box-type web plates and multiple support beams, providing exceptional mechanical stability and short-circuit withstand capability for main transformers across the entire voltage range from 110kV to 500kV.

Core Structural Features

1. Box-Type Web-Plate Load-Bearing Structure

Utilizes high-strength steel plates to form closed box-type web plates, significantly enhancing out-of-plane stiffness and overall torsional resistance.

Incorporates orthogonally arranged stiffening ribs, optimized based on voltage level (110-500kV) and power rating, to create an efficient multi-chamber force-bearing system.

Web plate cut-outs and edges are optimized through Finite Element Analysis (FEA) to ensure uniform stress distribution and prevent local stress concentrations.

2.Integrated Multi-Layer Support System

The upper section incorporates a precision-machined winding pressing platform equipped with modular, finely adjustable pressing studs, ensuring uniform and reliable axial clamping force distribution.

The middle section integrates a high-precision core positioning and clamping structure. Pre-installed conduits or dedicated raceways are provided for sensor cabling to facilitate integrated condition monitoring.

The lower section interfaces with the transformer tank using high-strength, anti-loosening bolted connections, complemented by dowel pins or alignment keys to ensure precise overall positioning and enhanced vibration resistance.

3. Dynamic Mechanical Optimization Design

Modal analysis and harmonic response analysis ensure the structure's natural frequencies effectively avoid excitation frequencies during normal operation and common fault conditions, preventing resonance.

Short-circuit withstand capability is verified according to the IEC 60076 series standards, ensuring structural safety and reliability under short-circuit shock loads.

The design incorporates fatigue analysis to ensure structural durability under long-term cyclic electromagnetic forces.

Technical Parameters and Specifications

Parameter Category	Typical Specifications for 110-220kV	Typical Specifications for 330-500kV	Design Standards
Rated Voltage Level	110kV, 220kV	330kV, 500kV	IEC 60076 Series
Short-Circuit Withstand	Verified for respective peak short-circuitcurrents	Verified for very high short-circuit currentsand durations	IEC 60076-5
Main Material Grades	Q355B/C,S355J2	Q390C/D, S460N, Special Steelfor UHV	GB/T1591,EN10025
Main Plate Thickness	14-20mm	20-30mm	Design Dependent
Surface Treatment	Sa2.5 Blast Cleaning + Epoxy Zinc-RichPrimer (60um)	Sa2.5 Blast Cleaning + High-Performance Anti-Corrosion Coating System	IS012944
Overall Dimensional Tolerance	Complies with ISO 2768-mk or strictercustomer standards	Complies with ISO2768-mK or strictercustomer standards	S02768

Manufacturing Process Advantages

Digitalization & Precision Cutting

Utilizes CNC plasma/laser cutting to ensure precision and bevel quality for high-strength steel plates.

Automated Welding

Core welds employ robotic automatic welding (MAG/SAW), equipped with seam tracking and real-time monitoring systems to ensure stability and consistency in deep penetration and multi-pass welds.

Large Component Forming & Control

Employs large-scale, high-precision press brakes and rolling machines, combined with dedicated assembly fixtures and 3D laser measurement instruments, to control dimensions, flatness, and geometric tolerances of large welded structures.

Quality Control System

1. Incoming Raw Material Inspection

Chemical composition, mechanical properties, and Ultrasonic Testing (UT) re-inspection for each batch of steel plates; welding consumables qualified per procedure qualifications.

2. In-Process Quality Control

Weld bevel inspection prior to welding; Non-Destructive Testing (NDT) such as Magnetic Particle Testing (MT) and Ultrasonic Testing (UT) performed on critical welds as specified.

3. Final Factory Inspection

Final dimensional inspection of the complete assembly; flatness inspection of load-bearing mating surfaces; review of the complete Manufacturing and Inspection Data Record (MDR) to ensure traceability.

Core Value Proposition

High Reliability

The proven optimized design and rigorous manufacturing provide a solid "skeleton" for the transformer, ensuring its ability to withstand electromagnetic, mechanical, and environmental stresses throughout its lifecycle, forming the foundation for safe transformer operation.

Excellent Performance

Superior short-circuit and vibration withstand capabilities directly contribute to reducing transformer operational noise and losses, enhancing grid stability.

Manufacturing & Delivery Assurance

Advanced automated production processes and strict quality control ensure high product quality, consistency, and reliable delivery schedules.

Technical Adaptability

Covers the full range from 110kV to 500kV, with sufficient standardization and customization capabilities to flexibly meet specific technical requirements of different global markets and projects.

This product features an advanced design philosophy and mature, reliable manufacturing processes. It is widely used in power grid projects and major initiatives across all voltage levels, making it an ideal choice for high-performance, high-reliability large power transformers.

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