What are the three types of transformers?

Hui Deng

February 2, 2026

Table of Contents

I. Power Transformers

These are the largest and most critical components in power systems, directly responsible for voltage transformation and power transmission.

Their core function lies in elevating transmission voltages to minimize losses over long distances, or reducing voltages to meet distribution and end-user requirements.

transformer application diagram
transformer application diagram

Step-up transformers: Typically installed at the output of power plants or renewable energy stations, these transformers elevate the medium-voltage electricity (e.g., 10.5kV, 20kV) generated by generators to ultra-high or extra-high voltages (e.g., 110kV, 500kV, 1000kV) for connection to the transmission grid.

Step-down transformers: Primarily located within substations, these transformers progressively reduce high voltages from the transmission grid to distribution voltages (e.g., 10kV, 35kV) or end-user voltages (380V/220V).

Interconnection Transformers: Used to connect transmission networks operating at different voltage levels, enabling power exchange and mutual support between grids. This enhances operational flexibility and reliability of the power system.

From an insulation and cooling perspective: Outdoor large-scale hub substations commonly employ oil-immersed transformers, relying on insulating oil for insulation and heat dissipation. In indoor locations with stringent fire safety requirements—such as high-rise buildings, subways, and data centers—dry-type transformers (air or resin insulated) are universally adopted.

oil immersed distribution transformer
oil immersed distribution transformer

II. Distribution Transformers

The final link directly supplying power to end-users.

• Installation Points: Pole-mounted transformers, distribution rooms, box-type transformers.

• Voltage: Input 10kV level, output 400V/230V.

• Core Requirements: High efficiency range, low losses, strong short-circuit withstand capability.

Amorphous alloy cores are emerging as an energy-saving trend due to their low no-load losses.

distribution transformer
distribution transformer

III. Special-Purpose Transformers

Specialized types designed for specific system requirements.

• Autotransformers: Share a common winding section, used for interconnecting power grids with similar voltages.

• Converter Transformers: Core components of high-voltage direct current transmission systems, capable of withstanding combined AC/DC electric fields.

• Grounding Transformers: Provide an artificial neutral point for ungrounded systems, limiting overvoltages.

Xizi Energy is a stable and reliable supplier of electrical equipment. If you are interested in learning more, please contact us immediately.

Professional Medium & High Voltage Electrical Equipment Manufacturer

No content is added yet.

Request a Call Back

Let’s talk about your project needs.
Submit your details, and one of our engineers or sales representatives will contact you soon to discuss how Xizi Energy can support your power distribution goals.

Iran, Brazil: +86 18878879777

Turkey, Russia: +86 18823198500

Contact Us Now!

No content is added yet.

Related Blog

RMU auxiliary contact testing guide, including switch position feedback, NO NC status check and fault troubleshooting

RMU Auxiliary Contact Testing: Position Feedback, Wiring & Common Faults

Anyone working on medium-voltage switchgear will hit this issue sooner or later. You might have a compact RMU — including our SM6 / RM6 compatible …

RMU safety checklist, 12 critical checks before ring main unit switching and maintenance

RMU Safety Checklist: 12 Critical Checks Before Switching or Maintenance

A ring main unit (RMU) is critical to medium-voltage power distribution. Many field incidents happen because crews rush switching or maintenance and skip basic safety …

Technical line drawing of ring main unit cabinet with RMU mechanical interlock system, medium voltage switchgear safety mechanism

RMU Mechanical Interlock: Working Principle, Types & Troubleshooting

Inside medium-voltage switchgear, RMU mechanical interlocks create a robust physical safety barrier, built entirely from plain metal components. This hardware stops operators from executing risky …

Contact Us Now!