Dry-Type Transformer Selection Solved: How to Choose Between F-Class, H-Class, SCB, and SCR

How to make the right choice when facing numerous dry-type transformer models on the market? This article will provide you with a detailed explanation of the secrets behind insulation levels (H, F) and models (SCB and SCR), helping you choose the most suitable and economical products according to your actual needs.

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1.Understanding insulation level: How does it affect the lifespan and performance of transformer?

The insulation level is one of the most important parameters of dry-type transformers. It directly determines the transformer’s tolerance and service life at high temperatures.

1.1 What is insulation grade?

The insulation level represents the heat resistance of the insulation material for transformer windings. It is represented by a letter, such as A, E, B, F, H, C. The higher the level, the higher the long-term working temperature allowed by the material. At present, the mainstream in the market are F-grade and H-grade.

1.2 Difference and Selection between F-Level and H-Level

• F-class insulation: The maximum allowable working temperature is 155 ° C. This is currently the most commonly used and cost-effective grade. It can meet the needs of the vast majority of conventional application scenarios, such as ordinary commercial buildings and light industries.
• H-class insulation: The maximum allowable working temperature is 180 ° C. It has higher heat resistance, therefore it has stronger overload capacity and longer lifespan. Suitable for environments with high temperatures, large load fluctuations, or higher reliability requirements, such as steel plants, data center core rooms, etc.
• Simply put, choosing H-class means providing greater temperature margin for the transformer, making it more reliable to operate under more stringent conditions.

2.Decoding Transformer Model: What is the difference between SCB and SCR?

You may often see SCB and SCR models, which represent different materials of winding conductors.

2.1 SCB: Epoxy resin cast dry-type transformer

The “B” in “SCB” represents the “foil” winding (usually copper foil) and casting process.

• Features: Its winding is vacuum cast in high-quality epoxy resin. This gives the transformer extremely high mechanical strength and moisture and dust resistance.
• Advantages: Strong short-circuit tolerance, stable performance, low noise, maintenance free.
• Applicable scenarios: Almost applicable to all standard occasions, it is currently the mainstream technology in the market.

2.2 SCR: Epoxy resin wrapped impregnated dry-type transformer

The “R” in “SCR” represents a “wire wound” winding.

• Features: It adopts wire wound winding and is vacuum impregnated with epoxy resin.
• Advantages: The heat dissipation performance is usually better, and the process is relatively flexible.
• Applicable scenarios: It is commonly used in non-standard products with special requirements or specific specifications for heat dissipation.
• For most users, SCB transformers are a more common and reliable choice due to their durability and excellent performance.

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3.Other key considerations for selecting dry-type transformer

In addition to insulation grade and model, the following points are also crucial:

• Energy Efficiency Level: Pay attention to Chinese energy efficiency standards (such as GB 20052), choose products with Level 1 or Level 2 energy efficiency, and achieve significant long-term energy-saving benefits.
• Protection level: such as IP20 (preventing solid foreign objects larger than 12mm from entering) or IP23 (preventing water splashing), which determines its ability to adapt to the environment.
• Brand and after-sales service: Choose a reputable brand to ensure professional technical support and reliable after-sales service.
• Cost considerations: It is not only necessary to compare the initial purchase price, but also to comprehensively consider the operating electricity costs, maintenance costs, and the total cost of the entire lifecycle.

Choosing the appropriate dry-type transformer is a highly technical decision. By understanding the two core elements of insulation grade and model differences, you can make wiser judgments and choose a reliable, efficient, and economical “heart” for your power system.

Luoyang Datang Energy Technology Co., Ltd. is a high-tech enterprise integrating R&D, manufacturing and supply of power equipment such as transformers, new energy components, distribution cabinets and inverters. With technological innovation as the core, we focus on creating high-reliability and high-performance power solutions to serve global customers. With a strict quality control system and international standard certification, we continue to output excellent products and enable customers to build safe and stable power systems.