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Oil Transformer

Your Professional Oil Transformer Supplier

 

Hebei Hozee Electric Co., Ltd., a professional Chinese distribution transformer manufacturer registered in Shijiazhuang, Hebei, adheres to "Efficient, Intelligent, Green" and is led by founder/CTO Liu Yanchao (15+ years in transformers) and his team of senior engineers (avg. 8+ years, mastering IEC/GB standards).It provides customized solutions (for voltage, working conditions, load) to serve domestic industrial/new energy/grid upgrade markets and over 50 countries globally. Future-focused on tech innovation, aiming to support the global energy transition.

 

 
 
Why Choose Us
 

Our Certificate
3 intelligent production lines with an annual production capacity of 500,000 kVA. It has passed ISO 9001 and ISO 14001 certifications, and the products comply with standards such as GB/T and IEC 60076.

 

Production Equipment
Our core equipment includes: slitting machines, horizontal shearing machines, horizontal shearing winding machines, and annealing furnaces; transformer equipment includes: foil winding machines, winding machines, drying furnaces, casting tanks, and transformer testing equipment.

 

Production Market
Our products are exported to countries along the "Belt and Road" such AS Southeast Asia, the Middle East, Latin America and Africa. They are adapted to different climatic conditions (such as tropical high humidity, desert high temperature and plateau low pressure) and power grid standards (IEC, ANSI, BS, AS/NZS, etc.), and have passed international certifications such as CE, CB and SASO, achieving "localized technology and global quality".

 

Technical Team
Our team of senior engineers, with an average of 8+ years of experience, excels in distribution transformer principles, market demands, and international standards (IEC, GB).

 

 
 
Advantages of Oil Transformer
01.

High Efficiency

The cooling oil reduces the risk of overheating, allowing the transformer to operate at higher power levels.

02.

Enhanced Insulation

The oil provides an extra layer of insulation, reducing the risk of electrical failures.

03.

Longer Lifespan

Properly maintained oil-immersed transformers can last 25 to 40 years.

04.

Cost-Effectiveness

Due to their simple construction and efficient cooling, oil-immersed transformers are often more cost-effective than dry-type transformers.

 

Specification

 

Model

S-M-250kVA-11/0.4

Type

Oil Immersed Power Transformer

Standard

IEC60076

Rated Power

250kVA

Frequency

50HZ

Phase

Three

Cooling Type

ONAN

Primary Voltage

11 KV

Secondary Voltage

0.4KV

Winding Material

Copper

Vector Group

Dyn11

Impedance

4%

Tap Changer

NLTC

Tapping Range

±2*2.5% @ Primary Side

No Load Loss

0.40 KW

On Load Loss

3.2KW

Accessories

Standard Configuration

 

250 Kva 3 Phase Transformer

 

Types of Oil Transformer

Single-phase transformers use one pair of windings. It’s used in lower-load situations, such as rural areas.


Three-phase transformers are made up of three pairs of windings. The windings typically go around a core sectioned into three parts. Three-phase transformers are used in higher-load areas and can supply three circuits with energy.


Power transformers are designed to handle much higher loads. They can step voltages up or down and transmit a current from one place to another.


Distribution transformers transmit lower voltages from the electrical grid to homes and businesses. They are much smaller than power transformers.


Pole-mounted transformers are connected to an electrical pole.


Pad-mounted transformers are mounted to a concrete pad on the ground.

 

Key Components of Oil Transformer

Transformer Core

The core is the base of the transformer. It is usually made of thin steel sheets to lower energy loss from eddy currents. The core guides the magnetic flow, which helps transfer energy between the windings.

Windings

Windings are metal coils, often copper or aluminum, wrapped around the core. There are two types: primary and secondary. The primary winding takes in energy, and the secondary sends it out at a different voltage. The number of coil loops decides how much the voltage changes.

Transformer Oil

Transformer oil is very important for oil type transformers. It works as a coolant and an insulator. The oil moves through channels, taking away heat from the core and windings. This cooling is especially needed in big transformers to manage heat.

 

How Oil Transformer Work

Voltage Input: AC voltage is applied to the primary winding.


Magnetic Induction: The AC current generates a magnetic field in the core.


Voltage Induction: The magnetic field induces voltage in the secondary winding, stepping it up or down as needed.

Heat Generation

The current flow generates heat due to electrical resistance.

Cooling Process

The insulating oil absorbs heat from the core and windings, transferring it to the cooling fins or radiators.

Heat Dissipation

The oil circulates naturally or through pumps (in larger models), cooling down as it passes through the fins and radiators.

 

manufacturing process of Oil Transformer

 
 

Design and Engineering:
The first step is designing the transformer according to specific customer requirements, voltage levels, and industry standards. Detailed engineering drawings are made for the core, windings, tank, and other components.

 
 

Core Manufacturing:
The transformer core is typically made of high-quality electrical steel, cut into thin sheets to minimize energy loss. The core is then assembled in a specific configuration to ensure efficient magnetic flux and low core losses.

 
 

Winding Manufacture:
Copper or aluminum wire is used to wind the primary and secondary coils, which are essential for voltage conversion. The windings are carefully designed to ensure proper electrical and thermal performance under load.

 
 

Tank and Cooling System:
The transformer tank is fabricated and then welded, ensuring it is airtight and strong. The cooling system, whether natural or forced, is installed to ensure the transformer operates efficiently under different loading conditions.

 
 

Assembly:
The core, windings, and tank are assembled together. The insulation materials are added between the windings to prevent short circuits and ensure electrical safety.

 
 

Oil Filling:
After assembly, the transformer is filled with high-quality transformer oil that provides both insulation and cooling. The oil is carefully filtered to ensure it is free from impurities and moisture.

 
 

Final Testing and Inspection:
Before leaving the factory, the transformer undergoes a series of tests to verify its performance, safety, and compliance with standards.

 

 

Application of Oil Transformer

 
 
01
 

Power Generation and Substations

In power generation, oil-immersed transformers are vital for stepping up the voltage produced by generators to transmission levels. This is essential for reducing energy losses during long-distance transmission. They are also used in substations to step down the voltage for distribution to end-users. The high voltage capacity and efficient cooling of oil-immersed transformers ensure safe and stable operation.

 
02
 

Industrial Facilities

Oil-immersed transformers are widely used in industrial environments, including steel mills, chemical plants, and manufacturing facilities. These locations require a steady and high-capacity power supply, which oil-immersed transformers can reliably provide. The robust design of these transformers can withstand harsh conditions, making them ideal for heavy industrial usage.

 
03
 

Renewable Energy Projects

With the growing adoption of renewable energy, oil-immersed transformers have become a key component in solar and wind power projects. These transformers are used to connect renewable energy sources to the grid, stepping up the voltage for efficient transmission. The ability to handle fluctuating loads makes them suitable for the intermittent nature of renewable energy generation.

15kva 3 Phase Transformer

 

FAQ

 

Q: What are the advantages of transformer oil?

A: Cooling: Transformers generate considerable amounts of heat when they are in operation. The oil absorbs the heat generated, then transfers it outwards; therefore the transformer does not heat up and burn up.

Q: Which transformer is best, oil or dry?

A: All the factors considered, the oil-filled transformer seems to be a better option. It offers higher efficiency, recyclability, lower noise levels, lower losses, etc.

Q: When to use an oil-filled transformer?

A: Oil-filled transformers are generally more efficient and have a higher power density than dry-type transformers. They are commonly used in high-voltage power transmission and distribution systems, as well as in industrial and commercial applications, where a higher power rating and increased efficiency is required.

Q: Where are oil type transformers used?

A: However, Oil Type Transformers. Windings and magnetic circuits of an oil-type transformer are immersed in oil which effectively insulates and cools the instrument, delivering optimal equipment performance in several applications used in distribution networks, small-scale industries, and renewable energy generation.

We're professional oil transformer manufacturers and suppliers in China, specialized in providing high quality products with advanced design. We warmly welcome you to buy oil transformer at competitive price from our factory. For specifications and drawings, contact us now.