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Three Phase Transformer

Your Professional Three Phase 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 Three Phase Transformer

More Power Delivery
A three-phase auto variable transformer has the most advantages over a single-phase transformer in that it can provide additional electricity to the grid. It is more efficient because it has three windings on the main.

 

Inexpensive
A three-phase dry style transformer is significantly less expensive than a single-phase transformer. The cost of purchasing three single-phase transformers is higher because it has a single core with three windings. Three-phase transformers will help the power generation industry save a lot of money.

 

Quick Assembly
A three-phase transformer is much simpler to assemble than a single-phase transformer. It is simple to obtain a single-phase current from a three-phase device, but it is more complicated to do the reverse. Since the three-phase system has three single-phase windings, it can supply power to a single circuit.

Lightweight

A three-phase transformer is lighter in weight than a single-phase transformer, which could surprise you. It is, therefore, cheaper to transport from one location to another as a result of this. It takes up less space and is simple to deploy at the power plant. Because of its small scale, it is portable and simple to install in a variety of industries.

Easy Maintenance and Repair

Three-phase transformers need less maintenance and repair. If a failure or problem occurs in a single phase, the other two stages may carry the power load. You can, however, rebuild the entire three-phase transformer or patch the single-phase transformer before using it. It is very unlikely for the fault to occur simultaneously in all three stages.

Higher Efficiency

Finally, a three-phase variable voltage autotransformer consumes far less power than its single-phase equivalent. It delivers constant power to the load, making it more stable and cost-effective. It is a self-cooling transformer that immediately prepares for the next power demand when it happens.

 

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

 

Types of Three Phase Transformer

 

Classification

Type

Features

Cooling Method

Oil-immersed

Efficient cooling, high power capacity
 

Dry-type

Oil-free, fire-resistant, indoor use

Application

Power transformer

Used in transmission & distribution
 

Distribution transformer

Supplies end users
 

Special transformer

E.g., rectifier, furnace transformers

Phase Configuration

Three-phase

Standard for industrial & power systems
 

Single-phase

Low-power applications

 

Structure of a Three Phase Transformer

 
 

Core
Made of laminated silicon steel sheets to minimize eddy current losses.
Common structures: Three-limb core (standard design) and Five-limb core (used for high-capacity transformers).

 
 

Windings (Coils)
High-voltage (HV) winding: More turns, thinner wire.
Low-voltage (LV) winding: Fewer turns, thicker wire.
Connection methods: Star (Y) or Delta (Δ).

 
 

Cooling System
Oil-immersed: Uses transformer oil for cooling, suitable for high-power applications.
Dry-type: Air-cooled, ideal for indoor or fire-sensitive environments.

 
 

Other Components
Tank, bushings, temperature gauges, Buchholz relay (for fault detection), etc.

 

 

Applications of Three-Phase Transformers

 
 
01
 

Power systems

Voltage step-up at power plants, step-down at substations.

 
02
 

Industrial use

Supplies motors, welders, variable frequency drives (VFDs).

 
03
 

Renewable energy

Grid integration in wind & solar power plants.

 
04
 

Railway & transportation

Electrified rail systems.

250 Kva 3 Phase Transformer

 

FAQ

 

Q: What are three-phase transformers most commonly used for?

A: Three-Phase Transformers:
Operate with three alternating voltage cycles, each 120° apart. Used in industrial and commercial settings, such as manufacturing plants and large office buildings. Provide more stable and consistent power, ideal for heavy machinery, motors, and large HVAC systems.

Q: What are the advantages of 3-phase transformers?

A: Compared to multiple single-phase transformers, three-phase transformers require less space, simplify installation, and have minimal infrastructure costs. These transformers are ideal for applications where space is limited, such as urban substations or onboard electrical systems in ships and aircraft.

Q: What is the working principle of a 3-phase transformer?

A: When a three phase supply is connected to the primary winding of a three phase transformer, it produces an alternating flux in the core. According to Faraday's law of induction, this alternating flux induces voltages in the secondary windings (working principle of three phase transformer).

Q: What is the efficiency of a 3-phase transformer?

A: It varies between 95% and 98%, depending on load, voltage, and design. The calculating efficiency of a transformer method is the same as for three-phase transformers.

Q: How to select a three-phase transformer?

A: The frequency of the line supply and electrical load must be the same. A three phase transformer is selected which is designed to operate at this frequency having a primary (input) equal to the supply voltage and a secondary (output) equal to the voltage required by the load.

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

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