Custom High-Precision Cut Silicon Steel Core for Reduced Eddy Current Losses Power/Oil Transformer Core

Product Description

Product Description

Oil-Immersed Transformer Core refers to the magnetic core component specially used inside the oil-immersed transformer. It is mainly made of high magnetic permeability materials (such as oriented silicon steel sheets) and is responsible for guiding magnetic flux and realizing efficient conversion of electrical energy. It is immersed in insulating transformer oil for cooling, insulation and protection.

Materials: cold-rolled oriented silicon steel sheets (CRGO), amorphous alloys or nanocrystalline materials
Structure: EI type, winding type, C type, stepped lamination, etc.

Excellent magnetic properties
Using high-grade high-quality cold-rolled oriented silicon steel sheets (30Q120, 23QG100, etc.)
High magnetic flux density, low hysteresis loss and low eddy current loss, significantly reducing no-load loss
Improve magnetic circuit efficiency and optimize energy consumption performance

Premium Quality & Fully Assembled Transformer Cores
Maximum Weight of Automatically Stacked Core: 60 Tons
Maximum Weight of Manually Stacked Core: 120 Tons
Precision Gap Limit at the Joint: Less than 1.0mm
Window Height Precision Accuracy: ±1mm
Window Width Precision Accuracy: ±1mm

We meticulously calculate and constantly update the quotation based on your precise drawings, ensuring the highest accuracy and cost-efficiency.Upon your confirmation, we will promptly initiate production based on the detailed drawings you provide, ensuring exact adherence to your specifications.

Why choose our transformer core

Electromagnetic properties: low iron loss, excellent magnetic properties.
Thickness accuracy: small longitudinal and transverse thickness difference, high stacking coefficient.
Processing performance
Easy to punch, high sheet size accuracy.
Insulation coating: uniform color, good insulation, strong adhesion, excellent heat resistance, good processing performance, long-lasting corrosion resistance. There are a variety of insulation coatings to choose from. After testing by professional testing agencies, the content of harmful substances meets the requirements of various existing environmental protection regulations at home and abroad, including EU ROHS and REACH.

We provide various types of oriented steel products:
--Ordinary oriented silicon steel G series
--High magnetic induction oriented silicon steel P series
--Magnetic domain refinement high magnetic induction oriented silicon steel R series
--Ordinary oriented silicon steel G series
--High magnetic induction oriented silicon steel P series
--Magnetic domain refinement high magnetic induction oriented silicon steel R series
--Ordinary non-oriented electrical steel A series
--High-efficiency non-oriented electrical steel AH series
--Stress relief annealing high-efficiency non-oriented electrical steel AR series

Painting type	T2	T4	H	C5	C6	Z
Application type	Cold-rolling silicon steel series	Non-oriented silicon steel series	Non-oriented silicon steel series	Non-oriented silicon steel series	Non-oriented silicon steel series	Non-oriented silicon steel series
Component	Inorganic	Semi-organic	Semi-organic	Semi-organic	Semi-organic	Semi-organic
Stacking coefficient	High	High	High	High	High	High
Layer-to-layer resistance	Very high	High	High	Very high	Very high	Very high
Attachment	B-D	Very good	Very good	Good	Good	Very good
Anti-corrosion property	Very good	Good	Good	Good	Good	Good
Heat-resistance	In non-oxygen environment, resistant to 800℃ annealing fire	In non-oxygen environment, resistant to 780℃ annealing fire	In non-oxygen environment, resistant to 750℃ annealing fire	In non-oxygen environment, resistant to 600℃ annealing fire	Unsuitable for annealing	Unsuitable for annealing
Punching property	Good	Very good	Very good	Good	Good	Very good
Welding property	--	Good	Good	Very good	Very good	--

Details

Core production process

Why Choose Us

Certifications

FAQ

Question	Answer
What type of material do you use for transformer cores?	We use high-permeability Cold Rolled Grain Oriented Silicon Steel (CRGO), such as 30Q120 or 23QG100. Non-crystalline and nano-crystalline alloys are also available upon request.
Can you customize the core structure and dimensions?	Yes, we offer OEM customization. We can manufacture EI-type, C-type, wound or laminated cores according to your drawings, voltage level, and transformer design.
Are the cores stress-relieved or annealed?	Yes, all cores are fully annealed to eliminate cutting stress and improve magnetic performance, which helps reduce core loss.
What is the typical no-load loss of your transformer cores?	Our CRGO transformer cores typically achieve no-load losses below 1.1 W/kg. Specific data will vary depending on material grade and structure design.
Do you provide third-party inspection reports?	Yes. We can provide reports from SGS, BV, or other labs upon request. We also offer internal quality certificates for dimension, loss, and insulation.
What voltage range are your cores suitable for?	Our cores are applicable to oil-immersed transformers from 10kV up to 110kV. Please share your design requirements for recommendations.
What is your minimum order quantity (MOQ)?	For standard sizes, small trial orders are acceptable. For custom cores, the MOQ is typically 1 ton or 1 complete core set.
What is your typical lead time?	For standard cores: 7–10 days. For custom designs: 15–20 days depending on complexity and quantity.
Do you provide export packaging?	Yes. Our export packages include anti-rust oiling, shrink-wrapping, anti-vibration padding, and fumigation-free wooden crates or pallets.
Do you have experience working with overseas customers?	Yes. We have exported to customers in Southeast Asia, the Middle East, South America, and Africa. Customer references are available upon request.

Packing & Delivery