Introduction
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:
- المصانع الصناعية
- المباني التجارية
- محطات الكهرباء الفرعية
- محطات الطاقة الشمسية
- مشاريع طاقة الرياح
- Mining facilities
- مراكز البيانات
- Manufacturing plants
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 من 15 كيلو فولت أمبير إلى 500 ميغا فولت أمبير, including:
- Three phase dry type transformers
- Three phase oil immersed transformers
- محولات التوزيع
- محولات الطاقة
- محولات مثبتة على قاعدة
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
- اللب المغناطيسي
- نظام العزل
- نظام التبريد
- 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
على سبيل المثال:
محول خفض الجهد
Input:
13.8kV
Output:
480V
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
مستوى عالٍ من السلامة من الحرائق
لا يوجد خطر تسرب الزيت
متطلبات صيانة قليلة
مناسب للتركيب الداخلي
صديقة للبيئة
Common Applications
Three phase dry type transformers are commonly installed in:
المباني التجارية
المستشفيات
المطارات
مراكز البيانات
المنشآت الصناعية
مراكز التسوق
التقييمات المعتادة:
| السعة | التطبيق |
|---|---|
| 15 كيلو فولت أمبير | Small commercial loads |
| 45 kVA | Industrial equipment |
| 75 كيلو فولت أمبير | Building power supply |
| 500 كيلو فولت أمبير | Factory distribution |
| 2500 كيلو فولت أمبير | 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.
Advantages
- High power capacity
- أداء تبريد ممتاز
- عمر خدمة طويل
- Suitable for outdoor applications
التطبيقات
Common applications include:
- محطات الكهرباء الفرعية
- مزارع الطاقة الشمسية
- Wind farms
- المنشآت الصناعية
- Power transmission systems
Typical voltage ratings:
- 6kV
- 10kV
- 11kV
- 13.8kV
- 35kV
- 110kV
- 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
التطبيقات:
- Residential areas
- Commercial facilities
- المصانع الصناعية
4. Three Phase Power Transformer
A three phase power transformer is used in high voltage transmission and substations.
التطبيقات:
- محطات توليد الطاقة
- Grid substations
- مشاريع الطاقة المتجددة
Power range:
From several MVA to hundreds of MVA.
Three Phase Transformer Applications
Industrial Power Systems
Factories rely on three phase transformers to supply power for:
- المحركات
- Compressors
- Pumps
- آلات التصنيع باستخدام الحاسب الآلي (CNC)
- خطوط الإنتاج
- Automation equipment
Industrial transformers usually require:
- كفاءة عالية
- Continuous operation
- Strong overload capability
المباني التجارية
Three phase transformers are commonly used in:
- مباني المكاتب
- الفنادق
- مراكز التسوق
- المطارات
A common North American system:
480V → 208Y/120V
This voltage system is widely used for:
- Lighting
- أنظمة التدفئة والتهوية وتكييف الهواء
- Building equipment
مشاريع الطاقة المتجددة
Solar and wind projects require transformers to increase voltage before grid connection.
Example:
Solar inverter:
800V
↓
Transformer:
0.8kV / 35kV
↓
Grid connection
Three Phase Transformer Voltage Ratings
Different countries use different voltage standards.
أمريكا الشمالية
Common voltages:
| الجهد الأولي | الجهد الثانوي |
|---|---|
| 480V | 208Y/120V |
| 600V | 347/600V |
| 13.8kV | 480V |
| 34.5kV | 480V |
International Markets
Common systems:
| Primary | Secondary |
|---|---|
| 10kV | 400V |
| 11kV | 415V |
| 20kV | 400V |
| 35kV | 400V |
EverNew transformers can be designed according to:
- اللجنة الانتخابية الدولية (IEC)
- ANSI
- IEEE
- UL
- CSA
- CE
- GOST
How To Select A Three Phase Transformer?
يتطلب اختيار المحول المناسب تقييم عدة معايير فنية.
1. Transformer Capacity (kVA)
The transformer capacity must match the electrical load.
Common sizes:
- 15 كيلو فولت أمبير
- 30 kVA
- 45 kVA
- 75 كيلو فولت أمبير
- 112.5 kVA
- 150 kVA
- 500 كيلو فولت أمبير
- 1000 كيلو فولت أمبير
- 2500 كيلو فولت أمبير
2. جهد الدخل والجهد الخرج
Example:
Commercial building:
Input:
480V Three Phase
Output:
208Y/120V Three Phase
3. Frequency
Common frequencies:
- 50Hz
- 60Hz
4. Transformer Cooling Method
Choose according to installation environment:
Indoor:
محول من النوع الجاف
Outdoor:
محول مغمور بالزيت
5. Transformer Standards
قد تتطلب المشاريع الدولية ما يلي:
- UL certification
- CSA certification
- DOE efficiency
- IEC standards
- معايير 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
Why Choose EverNew Transformer?
EverNew Transformer is a professional transformer manufacturer in China with more than 30 years of experience.
Our manufacturing capabilities include:
Product Range
- محول التوزيع
- محول من النوع الجاف
- محول مغمور بالزيت
- محول مُركَّب على قاعدة
- محول الطاقة
Technical Capability
Capacity:
15 kVA – 500 MVA
Voltage:
6kV – 500kV
الشهادات
- UL
- CSA
- CE
- GOST
- ISO
We supply transformers for:
- الولايات المتحدة الأمريكية
- كندا
- أمريكا الجنوبية
- Europe
- Asia
- أفريقيا
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:
- 480V
- 208Y/120V
- 400V
- 415V
- 13.8kV
- 35kV
How much does a three phase transformer cost?
يعتمد السعر على:
- Transformer capacity
- Voltage rating
- ملف من النحاس أو الألومنيوم
- طريقة التبريد
- المعايير المطلوبة
- Order quantity
How do I choose a three phase transformer size?
You should consider:
- Total connected load
- Starting current
- Future expansion
- متطلبات الجهد الكهربائي
- متطلبات الكفاءة
الخلاصة
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
- طريقة التبريد
- بيئة التثبيت
- International standards
بصفتي محترفًا 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.
