Precision Transformer Cores for Distribution and Power Transformers
Chenfan Electric manufactures CRGO transformer cores for oil-immersed transformers, dry-type transformers, distribution transformers, and power transformers.
Our main products include stacked transformer cores, cut-to-size CRGO laminations, step-lap cores, and complete core assemblies with clamps. We focus on the manufacturing accuracy of the core itself, because the transformer core directly affects no-load loss, excitation current, noise level, temperature rise, and long-term transformer reliability.
A good transformer core is not only about material grade. It also depends on cutting accuracy, burr control, stacking quality, joint structure, dimensional consistency, and final assembly control.
CRGO Transformer Core Manufacturing
We use CRGO / GOES silicon steel for transformer core production. The material can be selected according to transformer design requirements, including different thicknesses, grades, loss levels, and magnetic performance targets.
The manufacturing process includes:
- CRGO coil slitting
- Core lamination cutting
- Step-lap cutting
- Core stacking
- Clamp assembly
- Dimensional inspection
- Packing for sea shipment
For transformer manufacturers, accurate core processing helps reduce assembly problems and improves consistency during final transformer production.
Key Manufacturing Control Points
Burr Height Control
Burr height is one of the most important details in CRGO core manufacturing.
If the burr is too high, it can damage the insulation coating between laminations. This may increase local eddy current loss, create hot spots, and affect the long-term performance of the transformer core.
Chenfan Electric controls burr height below 0.02 mm to reduce the risk of insulation damage and improve core stability.
High Stacking Factor
The stacking factor directly affects the effective magnetic cross-section of the transformer core.
A low stacking factor means more air gaps and less effective steel area. This can increase excitation current, no-load loss, and transformer noise.
Our target stacking factor is above 97%, helping transformer manufacturers achieve better magnetic performance and more stable transformer assembly.
Multi-Step Lap Core Structure
We manufacture Multi-Step Lap transformer cores to improve magnetic flux transition at the core joints.
Compared with traditional butt-joint structures, step-lap construction helps reduce local magnetic resistance at the joint area. This can support lower no-load loss, lower excitation current, and lower transformer noise.
For transformer manufacturers, MSL step-lap cores are especially useful when the transformer design has strict requirements for loss, noise, and energy efficiency.
Complete Transformer Core Assembly
Chenfan Electric can supply complete transformer core assemblies with clamps according to customer drawings.
This helps transformer manufacturers reduce internal cutting and stacking work, shorten production time, and improve consistency between different transformer batches.
We can manufacture cores for different transformer capacities and voltage classes according to customer design, including 11kV, 22kV, and 33kV transformer applications.
Why Core Manufacturing Accuracy Matters
The transformer core is the magnetic path of the transformer. Any problem in the core manufacturing process may directly affect the final transformer performance.
Common risks include:
- High burr causing insulation damage
- Poor cutting accuracy causing joint gaps
- Low stacking factor increasing excitation current
- Uneven laminations causing core deformation
- Poor packing causing movement during sea shipment
- Incorrect assembly causing difficulty during coil fitting
That is why transformer core manufacturing must be controlled from material selection to cutting, stacking, inspection, and packing.
Transformer Core Supply for Global Transformer Manufacturers
Chenfan Electric supplies transformer core products for transformer manufacturers who need stable quality, accurate dimensions, and reliable delivery.
Our focus is simple: manufacture transformer cores that are easy to assemble, stable in performance, and suitable for international transformer production requirements.
Main products:
- CRGO transformer core
- Stacked transformer core
- Step-lap transformer core
- MSL transformer core
- Cut-to-size CRGO laminations
- CRGO slitted coils
- Complete transformer core assembly with clamps
Conclusion
A transformer core is not just a set of silicon steel sheets. It is a key part that determines transformer loss, noise, excitation current, and long-term reliability.
Chenfan Electric focuses on precision CRGO transformer core manufacturing, with strict control of burr height, stacking factor, cutting accuracy, step-lap structure, and final assembly quality.
For transformer manufacturers, a well-made core means easier assembly, more stable transformer performance, and lower production risk.