Chenfan Electric supplies precision transformer cores for oil-immersed transformers, dry-type transformers, distribution transformers, and power transformers.
We focus on laminated transformer core assemblies, CRGO slitting, core cutting, stacking, clamping, inspection, and export packaging. Our work is built around one simple target: helping transformer manufacturers receive stable, accurate, and ready-to-assemble cores.
What We Supply
Chenfan Electric mainly supplies:
- Laminated transformer core assemblies
- Pre-assembled transformer cores
- Step-lap transformer cores
- Multi-Step Lap / MSL transformer cores
- CRGO slitted coils
- Transformer core components and clamping structures
Our products are used in 11kV, 22kV, 33kV and other transformer projects, depending on customer drawings and technical requirements.
Why Transformer Core Quality Matters
The transformer core directly affects no-load loss, excitation current, noise, temperature rise, and long-term operating stability.
Small manufacturing errors can create serious problems:
Poor cutting accuracy may increase air gaps at the joint area.
High burrs may damage the insulation coating of CRGO steel.
Uneven stacking may reduce the stacking factor.
Poor clamping may cause vibration, noise, and transport movement.
That is why transformer core manufacturing is not only a cutting process. It is a complete control process from material selection to final assembly.
CRGO Material and Core Manufacturing Control
We work with CRGO / GOES silicon steel for transformer core production. According to different transformer designs, customers may require different grades, thicknesses, widths, step-lap structures, and window dimensions.
During production, we focus on:
- Burr height control
- Cutting accuracy
- Step-lap consistency
- Stacking factor
- Core window size
- Clamping structure matching
- Final dimensional inspection
- Export packing stability
For precision transformer cores, burr height control is especially important. Excessive burrs may damage the insulation layer between laminations and increase the risk of localized heating.
Chenfan Electric controls burr height within 0.02 mm according to production requirements, and targets a stacking factor above 97% when the material, design, and assembly conditions allow.
Multi-Step Lap / MSL Transformer Core
Multi-Step Lap, also called MSL, is widely used in modern transformer core manufacturing.
Compared with simple lap structures, MSL helps improve magnetic flux transition at the core joint area. A better joint structure can help reduce excitation current, noise, and no-load loss when combined with suitable CRGO material and correct assembly.
For transformer manufacturers, this means the core is not only easier to assemble, but also more stable in electrical performance.
Complete Core Assembly for Export
For overseas transformer manufacturers, incomplete drawings, unclear tolerances, unstable packing, and poor dimensional control can cause serious delays.
Chenfan Electric can supply complete transformer core assemblies according to customer drawings, including core lamination, clamping parts, pre-assembly, inspection, and sea-export packaging.
Before production, we usually confirm:
- Transformer capacity and voltage level
- Core drawings and lamination drawings
- CRGO grade and thickness
- Step-lap structure
- Window size and center distance
- Hole position and clamping structure
- Required inspection points
- Packing and container loading requirements
This reduces misunderstanding between material price, cutting price, and complete core assembly price.
Export Packaging for Transformer Cores
Transformer cores are heavy, precise, and easy to deform during sea transport if packing is not handled properly.
For export orders, we use moisture protection, anti-rust protection, reinforced fixing, and stable loading methods according to the size and weight of the core. The target is to avoid movement, deformation, rust, and edge damage during transportation.
Working With Transformer Manufacturers
Chenfan Electric works with transformer manufacturers that need stable core supply, customized core drawings, CRGO slitted coils, and complete laminated core assemblies.
Customers can send transformer core drawings, CRGO requirements, quantity, packing requirements, and destination port. We will check the technical details first and then provide a quotation based on material, cutting, stacking, assembly, inspection, packaging, and delivery terms.
Conclusion
A transformer core is not a simple steel part. It is the magnetic center of the transformer.
Good CRGO material, accurate cutting, controlled burr height, proper step-lap design, high stacking factor, and stable assembly all affect the final transformer performance.
Chenfan Electric focuses on precision transformer core manufacturing for transformer factories that need reliable, export-ready core assemblies and CRGO slitted coils.