The materials utilized to make the winding and clamping devices of the amorphous alloy dry type transformer is basically the identical as those used in the frequent epoxy cast dry-type transformer. Nevertheless, the materials used to make the iron cores of both transformers are of nice difference. The former one has adopted a new high-tech product called the amorphous alloy.
The amorphous alloy is a thin magnetic material with a thickness of only about 0.03mm. It’s made by using the extremely-fast cooling technology to forged the alloy material with a sure proportion into ribbon chips via the cooling float bowl. Compared with the cold-rolled silicon metal sheet, the amorphous alloy materials has five advantages but in addition has 5 disadvantages, which bring many difficulties to the design and manufacture of all types of distribution transformers.
(1) Isotropic soft magnetic materials;
(2) Low loss, about 30% of that of the silicon metal sheet;
(three) High electrical resistivity, about three instances of that of the silicon steel sheet;
(four) Handy subsequent processing (subsequent processing can get the required magnetism);
(5) The manufacturing process is environmentally friendly.
(1) It is extremely thin. The surface of the fabric shouldn’t be ideally smooth, and the filling coefficient of the iron core is about 0.86;
(2) Its hardness is way higher than that of the silicon metal sheet, which brings inconvenience to cutting and processing;
(3) It should receive annealing remedy;
(four) The fabric is fragile after annealing;
(5) Mechanical stress has a terrific affect on its performance.
Advantages of Amorphous Metal Transformers (AMT) Lower no-load loss. As the no-load loss is lower, the temperature rise of transformer is lower. Better harmonic wave tolerances. Potential for lower total cost of ownership.
Its high permeability adds to its supreme mixture for use in high frequency transformers and adjustable inductors. In actual fact, the high magnetic permeability alongside with with a low electrical conductivity of ferrites helps in the prevention of eddy currents.
The cores of conventional transformers include stacks of laminations that are made from silicon metal with an almost uniform crystalline structure (CRGO). In transformers with amorphous cores, a ribbon of steel is wound to form the core.
As the rankings are increased stepped or multi-stepped cores are favorred, which improve mechanical stability, reduce the length of mean turn and end in copper financial savings besides rising efficiency and improving regulation.