800kva Amorphous Alloy Oil Immersed Transformer

With 20 years of experience in transformer production, Wenzhou XiFa Electric Power Equipment Co., Ltd. is an enterprise specializing in the research and manufacturing of power equipment. We focus on providing efficient, reliable and energy saving power solutions. To further meet the excellent performance transformer demands of domestic and foreign customers, Wenzhou XiFa Electric Power Equipment Co., Ltd. Launched 800kva amorphous alloy oil immersed transformers. The whole products obey ISO quality management standards and have passed domestic and international certifications, serving both domestic and international markets.

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Product Description

800kva amorphous alloy oil immersed transformer is made of a new type of energy saving material. Its core material‌ is made of amorphous alloy, featuring high magnetic permeability and extremely low hysteresis loss, which can significantly enhance the no load energy efficiency and complies with GB/T 20052 or IEC 60076 standards.‌ And its cooling method‌ is oil immersed.

The sealed structure of the 800kva amorphous alloy oil immersed transformer is conducive to moisture proof and corrosion resistant, suitable for outdoor or indoor substations, with an altitude of ≤1000m and an environmental temperature rise of ≤55K.

The greatest advantage‌ of this 800kva amorphous alloy oil immersed transformer lies in extremely low no load loss. This transformer is approximately 300–450W (compared to silicon steel sheet which is about 1000–1500W), which is 60 to 75% lower than traditional silicon steel sheet transformers. At the same time, it has low noise (≤55 to 60 dB), strong overload capacity, long lifespan, and can typically be used for 25 to 30 years. However, the cost is higher (about 20% to 40% more expensive than transformers of the same specification with silicon steel sheets).

Therefore, 800kva amorphous alloy oil immersed transformer is suitable for industrial, commercial or power distribution scenarios with high energy efficiency requirements.

800kva Amorphous Alloy Oil Immersed Transformer

Technical parameter:

Product Name	800kva amorphous alloy oil immersed transformer
Rated Power	800 kva
High Voltage	6 6.3 10 10.5 11 kv
H.V. Tap Range	±2×2.5%
Low Voltage	0.4 kv
Connection Symbol	Dyn11 / YNyn0
Short Circuit Impedance	4.5 %
Excitation Losses	380 kw
Winding Losses	7500 kw
No Load Current	0.3 %

Q:Why is the no load loss of the 800kva amorphous alloy oil immersed transformer significantly lower than that of the transformer with the same capacity made of silicon steel sheets?

A:Firstly, the thickness of the amorphous alloy strip is only 20 to 30 µm, which is approximately one tenth of the thickness of conventional silicon steel sheets (230 to 350 µm). According to the relationship that eddy current loss is proportional to the square of thickness, the eddy current loss in the 800 kVA core is significantly reduced. At the same time, the resistivity of the amorphous alloy is about 2.5 times higher than that of silicon steel sheets, further weakening the circulating current loss induced between the layers when the magnetic flux changes.

Secondly, the hysteresis loop is narrow and the coercivity is low. The amorphous alloy has an amorphous structure without grain boundary defects, and the resistance of magnetic domain flipping is small. The coercivity is only 1/3 to 1/5 of that of silicon steel sheets. This significantly reduces the energy required for each cycle of magnetization and greatly decreases the hysteresis loss.

Thirdly, the design of working magnetic flux density is relatively low. For 800kva amorphous alloy oil immersed transformer, the rated magnetic flux density is typically set at 1.35 to 1.45T, which is lower than the 1.65 to 1.75T of silicon steel sheets. Since iron loss is proportional to the square or higher power of the magnetic flux density, appropriately reducing the magnetic flux density can lead to a significant decrease in unit mass loss.

Based on the above mechanisms, the no load loss of an 800kva amorphous alloy oil immersed transformer is generally only 30% to 40% of that of a transformer of the same capacity with S13 or S14 grade silicon steel sheets. It is particularly suitable for power distribution scenarios where the equipment is often in light load or standby conditions.