Three Phase Transformer: Working Principle, Types, Applications and Selection Guide

Voltage Ratio = Primary Turns / Secondary Turns

예를 들어:

스텝다운 변압기

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
높은 화재 안전성
No oil leakage risk
유지 관리가 거의 필요하지 않음
실내 설치에 적합합니다
친환경적인
Common Applications

Three phase dry type transformers are commonly installed in:

상업용 건물
병원
공항
데이터 센터
산업 시설
쇼핑센터

Typical ratings:

EverNew manufactures dry type transformers with:

• Copper winding
• Aluminum winding
• Cast resin insulation
• UL/CSA compliant designs

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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.

장점

• High power capacity
• 뛰어난 냉각 성능
• 긴 수명
• Suitable for outdoor applications

애플리케이션

일반적인 용도로는 다음과 같은 것들이 있습니다:

• 유틸리티 변전소
• 태양광 발전소
• 풍력 발전소
• 산업 플랜트
• Power transmission systems

Typical voltage ratings:

• 6kV
• 10kV
• 11kV
• 13.8kV
• 35kV
• 110kV
• 220kV

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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

애플리케이션:

• 주거 지역
• Commercial facilities
• 산업 공장

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4. Three Phase Power Transformer

A 3상 전력 변압기 is used in high voltage transmission and substations.

애플리케이션:

• 발전소
• Grid substations
• 재생에너지 프로젝트

전력 범위:

From several MVA to hundreds of MVA.

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Three Phase Transformer Applications

산업용 전력 시스템

Factories rely on three phase transformers to supply power for:

• 모터
• Compressors
• Pumps
• CNC 공작기계
• 생산 라인
• Automation equipment

Industrial transformers usually require:

• 고효율
• Continuous operation
• Strong overload capability

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상업용 건물

Three phase transformers are commonly used in:

• 사무실 건물
• 호텔
• 쇼핑몰
• 공항

A common North American system:

480V → 208Y/120V

This voltage system is widely used for:

• Lighting
• HVAC 시스템
• Building equipment

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재생 에너지 프로젝트

Solar and wind projects require transformers to increase voltage before grid connection.

예시:

Solar inverter:

800V

↓

Transformer:

0.8kV / 35kV

↓

Grid connection

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Three Phase Transformer Voltage Ratings

Different countries use different voltage standards.

북미

Common voltages:

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International Markets

Common systems:

EverNew transformers can be designed according to:

• IEC
• ANSI
• IEEE
• UL
• CSA
• CE
• GOST

---

How To Select A Three Phase Transformer?

올바른 변압기를 선택하려면 몇 가지 기술적 매개변수를 평가해야 합니다.

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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

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2. 입력 및 출력 전압

예시:

Commercial building:

Input:

480V Three Phase

Output:

208Y/120V Three Phase

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3. Frequency

Common frequencies:

• 50Hz
• 60Hz

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4. Transformer Cooling Method

Choose according to installation environment:

Indoor:

건식 변압기

Outdoor:

오일 침지형 변압기

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5. Transformer Standards

국제 프로젝트의 경우 다음 사항이 필요할 수 있습니다:

• UL certification
• CSA certification
• DOE efficiency
• IEC 표준
• IEEE 표준

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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

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왜 에버뉴 트랜스포머를 선택해야 할까요?

EverNew Transformer is a professional transformer manufacturer in China with more than 30 years of experience.

Our manufacturing capabilities include:

Product Range

• 배전 변압기
• 건식 변압기
• 오일 침지형 변압기
• 패드 장착형 변압기
• 전력 변압기

Technical Capability

용량:

15 kVA – 500 MVA

전압:

6kV – 500kV

인증

• UL
• CSA
• CE
• GOST
• ISO

We supply transformers for:

• 미국
• 캐나다
• 남미
• 유럽
• 아시아
• 아프리카

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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.

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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?

The price depends on:

• Transformer capacity
• Voltage rating
• 구리 또는 알루미늄 권선
• 냉각 방법
• Required standards
• Order quantity

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How do I choose a three phase transformer size?

You should consider:

• Total connected load
• Starting current
• Future expansion
• 전압 사양
• Efficiency requirements

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결론

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
• 냉각 방법
• 설치 환경
• 국제 표준

전문가로서 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.