Dry Type Rectifier Transformer

Product Introduction:

1. Safe and Reliable:

Made of non-toxic and flame-retardant epoxy resin, with high mechanical strength, flame resistance, fire resistance, and pollution-free characteristics.

2. Easy Installation:

The complete machine can enter the site and be put into operation once it is in place, making it convenient and easy to install.

3. Insulation and Heat Resistance:

Class H insulation is heat-resistant, capable of withstanding up to 180℃ and an overload strength ≤ 200%.

4. Investment Saving:

It can be installed together with electrical equipment such as rectifiers to save space and reduce investment costs.

Product Advantages:

1. Reliability of Insulation Technology:

From the initial two-dimensional electric field simulation, three-dimensional electric field measurement, and impulse characteristic measurement to theoretical analysis and simulation testing on the main insulation characteristics of the transformer—longitudinal insulation, end insulation, cable insulation, and winding under lightning impulse—through years of research and multiple verification methods, the reliability of the transformer’s insulation has been ensured.

2. Calculation of Leakage Magnetic Field and Reduction of Eddy Current Losses:

We specialize in calculating and measuring the transformer’s leakage magnetic field, magnetic shielding structure, and the dynamic and thermal stability of transformers. This ensures accurate leakage inductance field calculations, reduces parasitic losses, and improves the dynamic stability of the transformer.

3. Accurate Analysis of Coil Temperature Field:

Our company has cooperated with universities such as Tsinghua University, Beijing University of Science and Technology, and Huazhong University of Science and Technology to jointly develop a coil temperature field calculation program. By calculating the distribution of coil losses (including resistance losses, eddy current losses in different directions, and circulating current losses between parallel wires) and the cooling conditions of the flow velocity field, we can accurately calculate the coil temperature distribution and hot-spot temperature rise, allowing effective control of hot-spot temperature, which affects the transformer’s service life.

4. Reduction of Partial Discharge in Transformers:

The electric field intensity of each component has been strictly analyzed and controlled during the design stage. The compliance of manufacturing quality, reliability of processing methods, and rationality of operating technology also effectively control the partial discharge levels of transformers.

 

Use Scenarios 

Industrial Power Supply Systems with Integrated Rectification
In heavy industries such as metal processing and manufacturing, this dry type transformer serves as a critical component for stable power conversion through rectification. It operates within environments requiring both high heat resistance and low emissions, such as electric furnace applications. Its compact and flame-retardant design meets strict safety and performance standards, enabling seamless integration with rectifier modules and motor control systems. This transformer ensures regulated voltage supply, enhancing both production consistency and the longevity of connected equipment within industrial power distribution frameworks.

Frequency Conversion and Motor Control in Automation Facilities
Automation plants use this dry type rectifier transformer to support frequency conversion, allowing precise motor speed regulation critical for process optimization. Operating in electrically demanding and thermally challenging settings, it complies with rigorous performance benchmarks and noise restrictions. This transformer’s capacity to sustain thermal overload and integrate directly with variable frequency drives improves energy efficiency and system responsiveness. Its reliable operation reduces downtime in industrial automation workflows, assisting in meeting production targets while maintaining compliance with electrical power safety regulations.


Technical Parameter Table:

Execution Standards:

1. GB 20052-2020 Energy Efficiency Limits and Grades for Power Transformers
2. GB/T 1094.1-2013 Power Transformers Part 1: General Provisions
3. GB/T 1094.3-2017 Power Transformers Part 3: Insulation Levels, Dielectric Tests, and External Clearances
4. GB/T 1094.5-2008 Power Transformers Part 5: Ability to Withstand Short Circuits
5. GB/T 1094.10-2022 Power Transformers Part 10: Determination of Sound Levels
6. GB/T 1094.11-2022 Power Transformers Part 11: Dry-Type Power Transformers
7. GB/T 1094.12-2013 Power Transformers Part 12: Loading Guide for Dry-Type Transformers
8. GB/T 10228-2015 Technical Parameters and Requirements for Dry-Type Power Transformers

Advanced Production Technology Ensures Product Reliability:

1. 3D Design: Based on more than 30 years of experience in transformer design, manufacturing, and testing, Shanghai Zhiyou has developed a pioneering "3D + parameterized" software system that enables automatic design, cost optimization, simulation, and modeling. It fully considers national and industry standards to ensure the progress and accuracy of product design.
2. High-Voltage Winding: The high-voltage winding conductor is made of high-quality copper wire, reinforced with long and short-cut glass fiber felt as filler, and cast under vacuum using the world-class Heinrich vacuum casting system. This effectively suppresses partial discharge phenomena, with a partial discharge capacity of less than 5pC.
3. Low-Voltage Winding: The low-voltage winding uses high-quality foil conductors and is wound by an automatic foil winding machine. The machine adopts an "energy-saving hydraulic winding system" with ±0.5mm precision detection and advanced hydrogen arc welding technology, which plays a key role in ensuring coil winding quality.
4. Iron Core: The iron core adopts a multi-step lap joint structure, ensuring that under various operating conditions, the core does not shift laterally or longitudinally.
5. High-Quality Insulation:

The transformer body adopts a high-temperature-resistant mixed insulation system, effectively solving temperature field differences in various transformer structures and ensuring insulation safety and reliability.

6. Advanced Winding Technology:

Made of high-quality conductor windings reinforced with long and short glass fiber felt, poured under vacuum using the world-class Heinrich vacuum casting system.

7. Fully Automatic Core Stacking Technology:

The robot performs fully automatic lamination using a 45-degree 7-step miter joint structure, improving transformer lamination efficiency and quality.

8. Testing and Inspection Techniques:

All products strictly control the production process and quality links and undergo rigorous tests and inspections according to national standards and customer requirements before leaving the factory, including partial discharge testing, lightning impulse resistance, and noise inspection. Advanced testing equipment and a comprehensive inspection system ensure high product quality and excellence.

Ordering Notice:

1. Please provide detailed product parameters.
2. Please provide as much relevant product information as possible, such as product specifications, drawings, nameplates, and photos, so we can offer you a faster and more accurate quotation.
3. Please send the product specifications, drawings, nameplates, and photos you need to order to: shanghaizhiyou@gmail.com. We will reply as soon as we receive your email.
4. You can also quickly contact our sales manager Yang through the following: WeChat: +86 13122066665 or WhatsApp: +86 189 3091 2328.

We are committed to serving you with professionalism, sincerity, and integrity.


FAQ

What materials are used in the Dry Type Rectifier Transformer construction?
The Dry Type Rectifier Transformer features a core and winding encapsulated in non-toxic, flame-retardant epoxy resin, offering superior safety and durability. This material enables efficient heat resistance and meets strict environmental and operational standards expected from dry type transformers.

Can the Dry Type Rectifier Transformer be customized for specific industrial applications?
Yes, Shanghai Zhiyou offers customization services to tailor power transformers to customer specifications. Whether for electric furnace use, variable frequency drives, or specific voltage requirements, the transformer design can be adapted to suit diverse industrial needs while maintaining certified safety and reliability.

What installation considerations are there for the Dry Type Rectifier Transformer?
This transformer is designed for straightforward onsite installation and can be directly integrated with rectifier equipment, saving space and installation cost. Its dry-type construction eliminates the need for special distribution rooms, facilitating quicker deployment within industrial power systems.

How does Shanghai Zhiyou ensure the quality and certification of its transformers?
All transformers, including this electrical transformer, undergo rigorous quality inspection aligned with Chinese national standards (GB standards) and are certified by national electrical product quality supervision centers. This guarantees performance reliability, low noise levels, and operational safety across industrial applications.