簡介
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:
- 工业厂房
- 商业建筑
- 变电站
- 太陽能發電廠
- 風力發電計畫
- Mining facilities
- 数据中心
- 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 15 千伏安至 500 兆伏安包括
- Three phase dry type transformers
- Three phase oil immersed transformers
- 配电变压器
- 电力变压器
- 垫装变压器
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
- 磁芯
- 隔熱系統
- 冷却系统
- 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
例如：
降压变压器
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
高度消防安全
No oil leakage risk
維護需求低
適用於室內安裝
環保
Common Applications
Three phase dry type transformers are commonly installed in:
商业建筑
医院
机场
数据中心
工業設施
購物中心
Typical ratings:
| 容量 | 应用 |
|---|---|
| 15 千伏安 | Small commercial loads |
| 45 kVA | Industrial equipment |
| 75 千伏安 | Building power supply |
| 500 千伏安 | Factory distribution |
| 2500 千伏安 | 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.
优势
- High power capacity
- 卓越的散熱效能
- 使用壽命長
- Suitable for outdoor applications
应用
常見的應用包括：
- 变电站
- 太阳能发电场
- 风电场
- 工業廠房
- Power transmission systems
Typical voltage ratings:
- 6kV
- 10 千伏
- 11 千伏
- 13.8kV
- 35 千伏
- 110 千伏
- 220 千伏
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
应用：
- 住宅區
- Commercial facilities
- 工业厂房
4. Three Phase Power Transformer
A 三相電力變壓器 is used in high voltage transmission and substations.
应用：
- 發電廠
- Grid substations
- 可再生能源專案
功率范围
From several MVA to hundreds of MVA.
Three Phase Transformer Applications
工业动力系统
Factories rely on three phase transformers to supply power for:
- 馬達
- Compressors
- Pumps
- CNC 機台
- 生產線
- Automation equipment
Industrial transformers usually require:
- 高效率
- 連續操作
- Strong overload capability
商业建筑
Three phase transformers are commonly used in:
- 辦公大樓
- 飯店
- 购物中心
- 机场
A common North American system:
480V → 208Y/120V
This voltage system is widely used for:
- Lighting
- 暖通空調系統
- Building equipment
可再生能源项目
Solar and wind projects require transformers to increase voltage before grid connection.
例如
Solar inverter:
800V
↓
Transformer:
0.8kV / 35kV
↓
Grid connection
Three Phase Transformer Voltage Ratings
Different countries use different voltage standards.
北美
Common voltages:
| 初级电压 | 二次电压 |
|---|---|
| 480V | 208Y/120V |
| 600V | 347/600V |
| 13.8kV | 480V |
| 34.5 千伏 | 480V |
International Markets
Common systems:
| Primary | Secondary |
|---|---|
| 10 千伏 | 400V |
| 11 千伏 | 415V |
| 20kV | 400V |
| 35 千伏 | 400V |
EverNew transformers can be designed according to:
- IEC
- ANSI
- 电气和电子工程师学会
- UL
- CSA
- CE
- 社会变革管理计划
How To Select A Three Phase Transformer?
要選擇合適的變壓器，必須評估幾項技術參數。.
1. Transformer Capacity (kVA)
The transformer capacity must match the electrical load.
Common sizes:
- 15 千伏安
- 30 kVA
- 45 kVA
- 75 千伏安
- 112.5 千伏安
- 150 千伏安
- 500 千伏安
- 1000 千伏安
- 2500 千伏安
2. 輸入與輸出電壓
例如
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:
干式变压器
Outdoor:
油浸式变压器
5. Transformer Standards
國際專案可能需要：
- UL certification
- CSA certification
- DOE efficiency
- IEC 標準
- IEEE 標準
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
為什麼要選擇 EverNew 變壓器？
EverNew Transformer is a professional transformer manufacturer in China with more than 30 years of experience.
我們的製造能力包括：
Product Range
- 配电变压器
- 干式变压器
- 油浸式变压器
- 垫装变压器
- 电源变压器
Technical Capability
容量
15 kVA – 500 MVA
电压
6kV – 500kV
认证
- UL
- CSA
- CE
- 社会变革管理计划
- ISO
We supply transformers for:
- 美国
- 加拿大
- 南美洲
- 欧洲
- 亚洲
- 非洲
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
- 35 千伏
How much does a three phase transformer cost?
The price depends on:
- Transformer capacity
- Voltage rating
- 銅線或鋁線繞組
- 冷却方式
- Required standards
- Order quantity
How do I choose a three phase transformer size?
You should consider:
- Total connected load
- Starting current
- Future expansion
- 電壓要求
- Efficiency requirements
结论
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
- 冷却方式
- 安裝環境
- 國際標準
作为专业人员 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.
