Transformer Silicon Steel

Transformer Silicon Steel, also known as silicon steel Sheet or Electrical Steel, it is a ferro-silicon soft magnetic alloy steel with very low carbon content, usually containing 0.5% to 4.5% silicon. The addition of silicon can increase the resistivity and maximum permeability of iron to reduce the coercivity, iron loss and magnetic aging.

At the heart of every transformer lies the transformer core, and the material used for this core plays a pivotal role in determining the efficiency and performance of the transformer. Two materials commonly used in transformer cores are silicon steel and CRGO (Cold-Rolled Grain-Oriented) electrical steel.

GNEE has a vision to be a reputed and most reliable manufacturer and exporter of CRGOelectrical steel laminations ,Slit coil and Active Core Assemblies - Built core.

Our standard practice is to initially check the CRGO materials received from the steel mills, for thickness,width,weight and no-load iron losses.

During the slitting and cutting process, we use electronic scale, vernier callipers, micro meter, and iron-loss tester and Epstein test, to ensure that the quality, dimensions and core losses are checked and maintained at every stage.

Slitting is done with caution and ensuring the right setting of blades to diminish any burr or unwanted shear force, Tolerances in Dimensions & Shape conforms to Standard, Uniquely desiqned software is used to determine the planning of CRGO Coil slitting for optimum use of material.Cutting of material is under supervision of highly experienced engineers, in fully automated CNc lines.

The basic Raw material is Cold Rolled Grain Oriented Steel(CRGO). Every coils is initially checked for Core Losses(lron losses), by the Core loss tester, Epstein tester,surface insulation and bend test checked before slitting the coil. The raw material is used only after it passes the quality checks.

The finished core laminations/ core assembly and Slit coil are well packed on wooden pallets, ensuring that there is no damage to the finished product. We provide complete traceability of material given to our customers.

Power Transformer Lamination
Distribution Transformer Lamination
Slit coil
core Assembly

Final Lamination is checked with core-loss tester foraccurate and achievable core-loss guarantees.

The difference between oriented silicon steel and non-oriented silicon steel
Non-oriented silicon steel: ferro-silicon alloy with very low carbon content. In the deformed and annealed steel sheet, its grains are distributed randomly. The silicon content of the alloy is 1.5% to 3.0%, or the sum of the silicon and aluminum content is 1.8% to 4.0%. The products are usually cold-rolled plates or strips, which are mainly used to manufacture motors and generators.

23HP70D 23HP75D 23HP80D 23HP85D 23HP90D 23HP95D 27HP90D 27HP95D 23HP100 27HP100 30HP105 23CG110 27HP110 27CG120 M4 30CG130 M4 CRGO CORE LOSSES OF ALL GRADES (w/kg 50 hz)

Types of electrical steels: grain- oriented electrical steel and non-oriented electrical steel

Electrical steel sheets are soft magnetic materials, for which high permeability and low magnetic core loss are the most important requirements to be met.
Therefore, electrical steel sheets are very widely used for multiple applications such as transformers, magnetic shield, and magnetic cores of electrical motors and generators. Electrical steels are typically classified into two groups in terms of their specific magnetic anisotropy.
One group are the grain-oriented electrical steel sheet that has a very strong crystallographic Goss texture and is highly anisotropic with one or two magnetic easy axes lying in the sheet plane since the easy axes in Fe–Si lie along the <100> directions. The other group are the non-oriented steels that. They have more raendom texture.
Grain-oriented FeSi steels are often referred to as doubly oriented electrical steels as they have has two perpendicular low-loss magnetic axes in the sheet plane.

Why do transformers use silicon steel sheets as cores?