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20/15-0.4kV Double High Voltage Dry Type Transformer

The 20/15-0.4kV Double High Voltage Dry Type Transformer is a dual high-voltage distribution transformer designed for regions where 15kV and 20kV grid voltages are used in different areas.

Through high-voltage tap changing, the transformer can be configured for 15kV or 20kV operation, allowing one transformer to adapt to different grid voltage conditions while reducing equipment replacement and system modification costs.

Featuring copper windings, reliable electrical performance and good thermal stability, it is suitable for industrial, commercial and public power distribution systems requiring flexibility, safety and reliable operation.

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Basic Info.

The 20/15-0.4kV Double High Voltage Dry Type Transformer is designed with two high-voltage winding sets and one low-voltage output. The dual high-voltage winding configuration provides flexible voltage connection options for power distribution systems requiring 20kV and 15kV high-voltage operation with a 0.4kV low-voltage output.

Compared with conventional single-high-voltage dry type transformers, this transformer offers greater flexibility in system configuration while maintaining the advantages of dry-type insulation, low maintenance and reliable operation.

The transformer can be engineered according to different capacity, impedance, insulation level, cooling and enclosure requirements, making it suitable for industrial, commercial, renewable energy and infrastructure power distribution applications.

Performance parameters for reference

Parameter	Specification
Product Type	Dual- Voltage Dry Type Transformer
Rated Capacity	400KVA Customized
Rated Voltage	20/15-0.4kV/Customized
Material	Copper or Aluminum
Frequency	50Hz / 60Hz
Cooling Method	AN / AF
Vector Group	Dyn5
Installation	Indoor / Outdoor with Enclosure
Insulation Level	F/H
Enclosure Protection	IP21 / IP23 / IP31
Standard	IEC,IEEE, ANSI, DOE

Double High Voltage Transformer Configuration

The main feature of this transformer is its two high-voltage winding sets.

The two HV winding sets are designed to work together according to the required electrical configuration. This allows the transformer to accommodate different high-voltage system conditions while providing a single 0.4kV low-voltage output.

This configuration is different from a conventional dry type transformer with only one high-voltage winding. It can provide a more flexible solution for projects where different medium-voltage operating conditions need to be considered.

Applications

01 Industrial Power Distribution

Suitable for factories, manufacturing facilities and industrial plants requiring flexible medium-voltage power distribution.

02 Commercial Buildings

Can be used in commercial buildings, high-rise buildings, business centers and other facilities where safe and low-maintenance transformer equipment is required.

03 Renewable Energy Systems

Suitable for solar PV, energy storage and other renewable energy projects where customized medium-voltage transformer configurations are required.

When Should You Choose a Double High Voltage Transformer?

A double high voltage dry type transformer is mainly selected when a project requires greater flexibility on the medium-voltage side.

It is suitable when:

Two HV voltage levels such as 20kV and 15kV need to be accommodated.
The project requires two high-voltage winding sets.
Series/parallel connection of HV windings is required.
Different or changing medium-voltage supply conditions need to be supported.
Future system expansion or voltage changes are being considered.

If the project has only one fixed high-voltage level and no special connection requirements, a conventional single-HV dry type transformer is usually a more economical and simpler choice.

For specific applications, please provide the single-line diagram and technical specifications for our engineering team to recommend the appropriate configuration.

FAQ

1.What is a double high-voltage dry type transformer?

A double high-voltage dry type transformer is a transformer equipped with two high-voltage winding sets and one low-voltage output. The two HV windings provide additional flexibility for specific medium-voltage system configurations.

2.What is the difference between a double high-voltage transformer and a conventional dry transformer?

A conventional dry transformer generally has one high-voltage winding designed for one rated HV system. A double high-voltage transformer incorporates two HV winding sets, allowing a more flexible configuration for projects involving different medium-voltage conditions.

3.Can the rated capacity be customized?

Yes. The rated capacity, impedance, insulation level, cooling method and other parameters can be customized according to the project requirements.

Looking for a customized double high voltage dry type transformer?

Contact Taili Electric with your required capacity, voltage configuration and technical specifications. Our engineering team can provide a customized transformer solution for your project.

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