Product Introduction:

The S22-M-10 (10-35KV) series transformers are Class 1 energy-efficient oil-immersed distribution transformers in accordance with the Chinese National Standard (GB 20052-2020/2024). They are the maximum energy-saving grade of current electrical steel strip oil-immersed transformers, and the maximum of current energy-saving limits. The main principle for S22 is “trade-off higher initial costs for lower operating losses” and to get the lowest total life-cycle cost.

Application scenarios：

1. Large industrial parks and manufacturing enterprises (continuous production).

2. Data centres, communication base stations, large commercial centres.

3. New high standard projects or existing network upgrading nodes with strict energy saving requirements.

Product Characteristics：

1. Improved grade iron core: Ultra-high permeability, thinner (ie 0.23mm and below) cold-rolled, grain-oriented silicon steel sheets (e.g. 23ZH90/23ZH80) with more refined lamination processes (e.g. five-stage step lamination) to minimise iron losses.

2. High quality windings: Generally use oxygen free copper wire or copper foil windings. Copper foil structures are often used for low voltage windings to improve conductivity and short circuit withstand capability and to reduce copper losses.

3. Structure and sealing: Uses a fully sealed corrugated oil tank to isolate air and prevent moisture, no need to maintain the core lifting. The operating noise is generally 20% lower than the average national standard, which is suitable for sensitive places such as residential areas.

Technical Parameter

Structure and Working Principle of Oil-Immersed Transformers:

Oil-immersed transformers are structurally similar to ordinary transformers. They are one type of transformer classified according to the method of core insulation. Therefore, they possess the significant characteristics of oil-immersed coils, which can reduce the thermal effects on internal equipment.

 The basic components of an oil-immersed transformer include the core, windings, and bushings. The core provides a path for magnetic flux. The windings generate the magnetic field. They consist of conductor coils wound around the core and insulated with cardboard diaphragms and shielding layers. The thickness of the winding insulation increases with increasing voltage. Bushings connect the transformer windings to the substation. 

Oil-immersed transformers are used in power distribution or substations. Their core and coils are immersed in oil, which serves as both cooling and insulation. The oil circulates through convection in oil pipes within the coils and flows around the coils and core assembly. In small-power transformers, the oil is cooled externally by the tank, while in large-power transformers, it is cooled by an air-cooled radiator. 

Purpose of Using Oil-Immersed Transformers:

1. Oil-immersed transformers can be installed on the ground, on a base, or on a pole, making them suitable for outdoor environments. They operate efficiently in a variety of applications, including power transmission and distribution networks, renewable energy generation, and small-scale industrial applications.

2. Oil-immersed transformers have a large capacity, thus saving significant amounts of electricity, minimizing power losses, conserving energy, and reducing user costs. Furthermore, the oil inside the transformer cools the internal iron core, thereby improving the durability and electrical performance of the transformer.

 Standard operating conditions:

1. Maximum ambient temperature ≤ +40℃

2. Minimum ambient temperature ≥ -25℃

3. Standard installation altitude ≤ 1000m

4. Derating is required for special conditions.