toroidal nanocrystalline core factory 90/120*20mm

Current transformer is a special transformer for measuring current of power transmission and distribution lines. The measurement precision differs from soft magnetic materials it uses. The higher precision (less measurement error) is, and the higher core permeability requires. When cold rolling silicon steel sheet cannot reach the requirement of little transformation ratio and low ampere turns, it has to use soft magnetic material with high permeability, such as perm alloy and Nanocrystalline alloy. Nanocrystalline alloy has the similar initial permeability as perm alloy, higher maximum permeability, good temperature stability, and 70%-75% lamination coefficient. In the same size and performances, amorphous core's weight is only two thirds of perm alloy core, and price is more competitive. In recent years, the demand of high-precision transformer (such as grades 0.2, 0.2S and 0.5S) has rapidly increased. Therefore, domestic demand of nanocrystalline alloy measurement current transformer core rapidly increases.

The core casing is made of SS, PC, DMC plastic,Aluminum or insulation paper.

Performance Parameters
Saturation Magnetic Induction Bs   1.25
Initial Permeability    4-10×10 4
Maximum Permeability   60×10 4
Curie Temperature ℃    570
Density(g/cm 3 )     7.3
Space Factor (%)     70-75
Space Factor(mm)   0.025-0.042