Introducción
A three phase transformer is one of the most widely used electrical transformers in industrial power distribution systems. It is designed to transfer electrical energy between three-phase power circuits while changing voltage levels efficiently and safely.
Three phase transformers are commonly used in:
- Plantas industriales
- Edificios comerciales
- Subestaciones de servicios públicos
- Plantas de energía solar
- Proyectos de energía eólica
- Mining facilities
- Centros de datos
- Plantas de fabricación
Compared with single phase transformers, a three phase transformer provides higher power capacity, improved efficiency, and better load balance, making it the preferred solution for medium voltage and high-power electrical systems.
As an experienced three phase transformer manufacturer, EverNew Transformer provides customized transformer solutions from De 15 kVA a 500 MVA, including:
- Three phase dry type transformers
- Three phase oil immersed transformers
- Transformadores de distribución
- Transformadores de potencia
- Transformadores montados sobre plataforma
What Is a Three Phase Transformer?
A three phase transformer is an electrical transformer designed for three-phase alternating current (AC) systems.
Unlike a single phase transformer, which operates with one alternating voltage waveform, a three-phase transformer uses three separate phases with a 120-degree phase difference.
The three phases provide:
- Higher power transmission efficiency
- Reduced conductor size
- Better motor performance
- More stable industrial power supply
A typical three phase transformer contains:
- Three primary windings
- Three secondary windings
- Núcleo magnético
- Sistema de aislamiento
- Cooling system
- Transformer enclosure
How Does a Three Phase Transformer Work?
The operating principle of a three phase transformer is based on electromagnetic induction.
When AC voltage is applied to the primary winding, it creates alternating magnetic flux inside the transformer core. This magnetic flux induces voltage in the secondary winding.
The voltage conversion ratio depends on the relationship between winding turns:
Voltage Ratio = Primary Turns / Secondary Turns
Por ejemplo:
Step Down Transformer
Input:
13.8kV
Output:
480 V
The transformer reduces medium voltage electricity to a usable low voltage level for industrial equipment.
Three Phase Transformer Types
Three phase transformers can be classified according to construction, insulation method, cooling system, and application.
1. Three Phase Dry Type Transformer
A three phase dry type transformer uses air as the cooling and insulation medium instead of transformer oil.
Dry type transformers are widely used where fire safety and environmental protection are important.
Advantages of Dry Type Transformer
Alta seguridad contra incendios
Sin riesgo de fugas de aceite
Requisitos de mantenimiento mínimos
Apto para instalación en interiores
Respetuoso con el medio ambiente
Aplicaciones comunes
Three phase dry type transformers are commonly installed in:
Edificios comerciales
Hospitales
Aeropuertos
Centros de datos
Instalaciones industriales
Centros comerciales
Calificaciones típicas:
| Capacidad | Solicitud |
|---|---|
| 15 kVA | Small commercial loads |
| 45 kVA | Industrial equipment |
| 75 kVA | Building power supply |
| 500 kVA | Factory distribution |
| 2500 kVA | Large industrial systems |
EverNew manufactures dry type transformers with:
- Copper winding
- Aluminum winding
- Cast resin insulation
- UL/CSA compliant designs
2. Three Phase Oil Immersed Transformer
A three phase oil immersed transformer uses insulating oil for cooling and electrical insulation.
Oil immersed transformers are commonly used for outdoor power distribution because they provide excellent heat dissipation and high capacity capability.
Ventajas
- High power capacity
- Excellent cooling performance
- Larga vida útil
- Suitable for outdoor applications
Aplicaciones
Entre sus aplicaciones más comunes se encuentran:
- Subestaciones de servicios públicos
- Parques solares
- Parques eólicos
- Plantas industriales
- Power transmission systems
Typical voltage ratings:
- 6kV
- 10 kV
- 11 kV
- 13.8kV
- 35 kV
- 110 kV
- 220kV
3. Three Phase Distribution Transformer
A three phase distribution transformer is designed to reduce medium voltage electricity to low voltage for end users.
Typical conversion:
11kV → 400V
13.8kV → 480V
35kV → 400V
Aplicaciones:
- Residential areas
- Instalaciones comerciales
- Plantas industriales
4. Three Phase Power Transformer
A transformador de potencia trifásico is used in high voltage transmission and substations.
Aplicaciones:
- Power plants
- Grid substations
- Proyectos de energía renovable
Power range:
From several MVA to hundreds of MVA.
Three Phase Transformer Applications
Sistemas de energía industrial
Factories rely on three phase transformers to supply power for:
- Motores
- Compressors
- Bombas
- Máquinas CNC
- Production lines
- Automation equipment
Industrial transformers usually require:
- High efficiency
- Continuous operation
- Strong overload capability
Edificios comerciales
Three phase transformers are commonly used in:
- Edificios de oficinas
- Hotels
- Centros comerciales
- Aeropuertos
A common North American system:
480V → 208Y/120V
This voltage system is widely used for:
- Iluminación
- Sistemas de climatización
- Building equipment
Proyectos de energía renovable
Solar and wind projects require transformers to increase voltage before grid connection.
Ejemplo:
Solar inverter:
800V
↓
Transformer:
0.8kV / 35kV
↓
Grid connection
Three Phase Transformer Voltage Ratings
Different countries use different voltage standards.
América del Norte
Common voltages:
| Tensión primaria | Tensión secundaria |
|---|---|
| 480 V | 208Y/120V |
| 600V | 347/600V |
| 13.8kV | 480 V |
| 34.5kV | 480 V |
International Markets
Common systems:
| Primary | Secondary |
|---|---|
| 10 kV | 400V |
| 11 kV | 415V |
| 20kV | 400V |
| 35 kV | 400V |
EverNew transformers can be designed according to:
- IEC
- ANSI
- IEEE
- UL
- CSA
- CE
- GOST
How To Select A Three Phase Transformer?
Choosing the correct transformer requires evaluating several technical parameters.
1. Transformer Capacity (kVA)
The transformer capacity must match the electrical load.
Common sizes:
- 15 kVA
- 30 kVA
- 45 kVA
- 75 kVA
- 112,5 kVA
- 150 kVA
- 500 kVA
- 1000 kVA
- 2500 kVA
2. Input and Output Voltage
Ejemplo:
Commercial building:
Input:
480V Three Phase
Output:
208Y/120V Three Phase
3. Frecuencia
Common frequencies:
- 50Hz
- 60Hz
4. Transformer Cooling Method
Choose according to installation environment:
Indoor:
Transformador de tipo seco
Outdoor:
Transformador sumergido en aceite
5. Transformer Standards
Los proyectos internacionales pueden requerir:
- UL certification
- CSA certification
- DOE efficiency
- Normas de la IEC
- Normas del IEEE
Three Phase Transformer Manufacturer
Selecting a reliable three phase transformer manufacturer is important for ensuring safety, efficiency, and long service life.
A professional transformer supplier should provide:
✔ Engineering design support
✔ Factory testing
✔ International certifications
✔ Customized voltage solutions
✔ Export experience
¿Por qué elegir el transformador EverNew?
EverNew Transformer is a professional transformer manufacturer in China with more than 30 years of experience.
Our manufacturing capabilities include:
Product Range
- Transformador de distribución
- Transformador de tipo seco
- Transformador sumergido en aceite
- Transformador montado en base
- Transformador de potencia
Technical Capability
Capacity:
15 kVA – 500 MVA
Voltage:
6kV – 500kV
Certificaciones
- UL
- CSA
- CE
- GOST
- ISO
We supply transformers for:
- EE. UU.
- Canadá
- América del Sur
- Europa
- Asia
- África
Three Phase Transformer FAQ
What is the difference between single phase and three phase transformer?
A single phase transformer is normally used for smaller loads, while a three phase transformer is designed for industrial and commercial power systems requiring higher capacity.
What is the most common three phase transformer voltage?
Common systems include:
- 480 V
- 208Y/120V
- 400V
- 415V
- 13.8kV
- 35 kV
How much does a three phase transformer cost?
El precio depende de:
- Transformer capacity
- Voltage rating
- Copper or aluminum winding
- Método de enfriamiento
- Normas obligatorias
- Order quantity
How do I choose a three phase transformer size?
You should consider:
- Total connected load
- Starting current
- Future expansion
- Voltage requirements
- Requisitos de eficiencia
Conclusión
A three phase transformer is an essential component in modern electrical power systems, providing efficient voltage conversion for industrial, commercial, and renewable energy applications.
Choosing the correct transformer requires careful evaluation of:
- Power capacity
- Voltage levels
- Método de enfriamiento
- Entorno de instalación
- International standards
Como profesional three phase transformer manufacturer, EverNew Transformer provides reliable transformer solutions worldwide with customized designs from low voltage distribution systems to high voltage power networks.
Contact EverNew Transformer today for your three phase transformer project.
