China Oil-Filled Transformer Manufacturers Suppliers Factory - Custom Oil-Filled Transformer

CHBEB oil-immersed transformers feature high-permeability, low-loss cold rolled silicon steel or amorphous alloy of iron and boron cores, combined with advanced winding techniques and fully sealed tank designs. These ensure significantly reduced no-load losses and operating noise while enhancing reliability and service life. The high-voltage windings employ a multi-layer cylindrical structure, while the low-voltage windings utilize spiral designs to offer superior short-circuit resistance. The oil tank with corrugated plates enables efficient self-cooling and maintenance-free operation, greatly reducing operational costs. Whether in high-temperature, humid, or heavily loaded environments, our transformers deliver stable and reliable performance.

Technical Specifications

Type: 3-phase oil immersed distribution transformer

Rated Power: 30kVA-25,000kVA

Voltage Class: 10-35kV

Frequency: 50 HZ/60 HZ

Protection Degree: IP00 (for indoor use); outdoor enclosure available if required

Insulation Class: A Glass

Efficiency: ≥98%

Standards: IEC 60076 / GB 1094

Winding Material: Copper or Aluminum

* All products can be customized according to capacity, voltage, no-load/load loss, and standards after consultation with our company.

CHBEB Oil-Filled Transformers

Explore our range of high-performance oil-immersed distribution transformers. As a trusted oil-immersed transformer manufacturer in China, we offer a wide selection of capacities and configurations, with customizable solutions to fit specific project requirements.

16000 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
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10000 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more
6000 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more
5000 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more
4000 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more
3750 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more
3000 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more
2500 Kva Oil-filled Transformer
• Coil Material: Copper/Aluminum
• Primary Voltage: 10-35kv
• Working Efficiency: 50HZ/60HZ
• Oil immersed distribution transformer
• Low loss transformer
view more

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Our Certifications

Your Reliable Partner in Transformer Engineering

With a strong foundation in the transformer industry since 1956, our three self-owned factories support full-process
in-house manufacturing, guaranteeing consistent quality.

Customize Based on Our Products Line

Already found a transformer close to your needs in our catalog? We can quickly adapt our standard models to match your application requirements, such as modifying capacity, voltage class, cooling types, or installation structure.
Manufacturing Based on Technical Documents

Have your technical specifications or drawings? Share them with us. Our engineering team will review the design, confirm all key parameters with you, and proceed with production under strict compliance with international standards.
Custom Design from Concept to Product

Don't have a detailed specification yet? Just share your ideas or functional needs, our team will work closely with you to design a fully customized transformer solution, covering everything from electrical design to structural layout and insulation system.

Contact CHBEB for Custom Transformer Solutions

In-House Manufacturing for Reliable Transformers

With a strong foundation in the transformer industry since 1956, our three self-owned factories support full-process in-house manufacturing, guaranteeing consistent quality.

Engineering Design Capability

Our engineering team designs transformers based on the specific requirements of each project. Every design takes into account voltage level, capacity, energy efficiency, and application conditions to ensure that the technical solution meets real-world application scenarios and the operational demands of power and distribution systems.
Modernized Production Facilities

Our three manufacturing plants are each equipped with advanced production lines, including silicon steel cutting lines, coil processing lines, automatic winding machines, and vacuum drying equipment. These facilities enable high-volume, high-consistency transformer manufacturing and are fully capable of supporting both OEM and ODM requirements.
High-Standard Manufacturing Process

Core Manufacturing: We manufacture transformer cores using high-permeability silicon steel sheets or amorphous alloy materials. We apply precision shearing and lamination techniques to effectively reduce no-load losses.

Winding Process: We use multi-layer winding with copper or aluminum conductors to ensure optimal electrical performance.

Assembly and Insulation: Our technicians follow strict assembly procedures, applying layer-by-layer insulation treatment to prevent electrical faults and enhance long-term reliability.

Oil Tank Manufacturing: We complete the system with a robust corrugated steel oil tank, manufactured with high-precision welding and reliable sealing to ensure long-term leak protection.
Insulation Control

High-quality insulating oil is injected and undergoes vacuum degassing to remove impurities and moisture, enhancing insulation performance and extending service life.
Strict Quality Control and Testing

A dedicated quality control team of over 30 professionals rigorously monitors raw materials and the entire production process. Each transformer undergoes full-parameter testing before leaving the factory, including electrical performance, safety, and withstand voltage tests, to ensure compliance with international standards such as IEC and IEEE.

FAQ

Q: What is the service life of a CHBEB oil-immersed transformer ?

A: With proper maintenance, our oil-immersed transformers can last 30 years or even longer.
Q: How does CHBEB test oil type transformers before shipment ?

A: We take a full suite of tests, including insulation resistance, turns ratio, no-load loss, load loss, short-circuit impedance, induced voltage, lightning impulse, and temperature rise tests, following IEC 60076 / GB 1094 standards.
Q: Do you offer OEM/ODM transformer manufacturing services ?

A: Yes, we provide full OEM and ODM services. You can customize based on our existing models, submit technical drawings, or simply share your requirements — our engineering team will take care of the design and manufacturing.
Q: What is the lead time for transformers ?

A: Standard orders are usually ready to ship within 30 days . For custom transformers, the lead time may vary depending on design complexity and order volume.
Q: What industries do you serve with your transformers ?

A: We serve utilities, renewable energy projects, heavy industry, mining, data centers, chemical plants, and infrastructure projects worldwide.
Q: Can you provide references or case studies of past transformer projects ?

A: Yes, we have a wide portfolio of successful transformer projects across different regions and industries.
Q: What is the process to working with your company ?

A: Simply contact us with your requirements. We will review your needs, provide a technical proposal and quotation, confirm specifications, and proceed to manufacturing after final approval.
Q: What is your technical support or after-sales service ?

A: We provide a 2-year warranty. Our engineers provide remote installation instructions, commissioning & and troubleshooting support throughout the life cycle of equipment.
Q: What are the advantages of oil-immersed transformers compared to dry-type transformers ?

A: Oil-immersed transformers offer better cooling efficiency, higher capacity handling, lower noise levels, and longer service life under high-load conditions. However, they require oil containment and fire safety precautions.
Q: What types of oil-immersed transformers are available ?

A: Oil-immersed transformers come in various types, including oil-immersed distribution transformers, oil-immersed power transformers. They can also be categorized by phases (single phase oil immersed transformer or three phase oil immersed transformer), cooling methods (ONAN, ONAF, OFAF), and winding materials (copper or aluminum), etc.
Q: What types of insulating oil are commonly used in oil-filled transformers ?

A: Mineral insulating oil is the most commonly used. Alternatives include biodegradable vegetable-based oil (natural ester) and synthetic ester oil, which offer better fire safety and environmental performance.

We are one of the most experienced oil-filled transformer manufacturers and suppliers in China since 1956, specialized in providing high quality products and service for global clients. We warmly welcome you to wholesale custom made oil-filled transformer from our factory.

Powering the World with Premium Transformer Solutions

As a leading Chinese transformer manufacturer with decades of expertise, CHBEB proudly serves clients across 17 countries and counting. Our global footprint expands continuously as we:

Deliver customized power solutions for more than 10 international projects
Support over 20 trusted distributors worldwide
Manufacture reliable low-voltage transformers with 60+ years of technical excellence

Let's energize your next power project with Chinese precision and global reliability.

Get in Touch with CHBEB

Leave a message for more information about our products series, and request a quote or expert advice.