6-11kV Amorphous Metal Dry Type Transformer

6-11kV Amorphous Metal Dry Type Transformer

Amorphous metal transformer is a low loss, high-efficiency power transformer. This type of transformer uses iron-based amorphous metal as the iron core. Due to the lack of long-range ordered structure of this material, its magnetization and demagnetization are easier than general magnetic materials. Therefore, the iron loss (i.e. no-load loss) of amorphous alloy transformers is 70-80% lower than that of traditional transformers that generally use silicon steel as the iron core. Due to the reduction in losses, the demand for power generation also decreases, and greenhouse gas emissions such as carbon dioxide also decrease accordingly. Due to energy supply and environmental protection factors, amorphous alloy transformers have been widely adopted in large developing countries such as China and India. Based on the electricity consumption of China and India, if amorphous alloy transformers are fully adopted in the distribution network, approximately 25-30 TWh of electricity can be saved annually, as well as 20 to 30 million tons of carbon dioxide emissions can be reduced.

The biggest advantage of amorphous alloy core distribution transformers is that they have extremely low no-load loss values. Whether the no-load loss value can be guaranteed in the end is the core issue to be considered in the entire design process. When arranging the product structure, in addition to considering that the amorphous alloy core itself is not affected by external forces, the characteristic parameters of the amorphous alloy must be accurately and reasonably selected during calculation. In addition to this design idea, the following three requirements must also be followed:

(1) Due to the low saturation magnetic flux density of amorphous alloy materials, the rated magnetic flux density should not be selected too high during product design. Usually, a magnetic flux density of 1.3 to 1.35T can obtain a better no-load loss value.

(2) The thickness of a single sheet of amorphous alloy material is only 0.03mm, so its lamination coefficient can only reach 82% to 86%.

(3) In order to enable users to obtain the benefits of maintenance-free or low-maintenance, amorphous alloy distribution transformer products are now designed as fully sealed structures.

Characteristics of Transformer Amorphous Alloy Structure

Using amorphous alloys with outstanding magnetic permeability as iron core materials for manufacturing transformers can ultimately achieve very low loss values. But it has many characteristics that must be guaranteed and considered in design and manufacturing. The main manifestations are as follows:

(1) Amorphous alloy sheet materials have high hardness and are difficult to shear with conventional tools, so reducing the amount of shear should be considered in design.

(2) If the thickness of an amorphous alloy single piece is extremely thin and the material surface is not very flat, the filling coefficient of the iron core is relatively low.

(3) Amorphous alloys are highly sensitive to mechanical stress. When designing the structure, it is necessary to avoid traditional design schemes that use iron cores as the main load-bearing structural components.

(4) In order to obtain excellent low loss characteristics, amorphous alloy iron chips must undergo annealing treatment.

(5) In terms of electrical performance. In order to reduce the shear of the iron chip, the entire product's iron core is composed of four separate iron core frames arranged in parallel, and each phase winding is mounted on two independent magnetic circuit frames. In addition to the fundamental magnetic flux, there is also the presence of third harmonic magnetic flux in each box. In two core boxes of a winding, the third harmonic magnetic flux is exactly opposite in phase and equal in value. Therefore, the sum of the third harmonic magnetic flux vectors in each winding group is zero. If the primary side is a D-connected circuit with third harmonic current, there will be no third harmonic voltage component on the induced secondary voltage waveform.

According to the above analysis, the most reasonable structure for three-phase amorphous alloy distribution transformers is: iron core, composed of four separate iron core frames in the same plane to form a three-phase five column structure, which must be annealed and have cross yoke joints, with a rectangular cross-sectional shape. Winding, with a rectangular cross-section, can be individually wound into a double-layer or multi-layer rectangular layered structure. The fuel tank is a fully sealed and maintenance free corrugated structure.

Technical Specifications

Note:

1. If you need more information about specifications, please contact us.

2. Due to the continuous updates of products, there may be some changes in the outline dimension and weight in the table. Please refer to the outline dimension diagram provided when placing an order.

3. Customized production can be carried out according to the customer's drawings and technical parameters.

Why choose BEYONDT?

1. We are an experienced manufacturer. We have 16 years of industry experience, from R&D to production.

2. We are a manufacturer that values quality and service. We always believe that quality and service are the life and soul of an enterprise.

3. We have the ability to provide customers with the best customized services, because our production lines and personnels are fully equipped.