Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of auto power transformer in China. If you're going to wholesale durable auto power transformer made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Zhejiang Hengli Electrical manufactures Auto Power Transformers (Autotransformers) for applications where the input and output voltages are relatively close and electrical isolation between the two circuits is not required.
Unlike a conventional two-winding transformer, an autotransformer uses a common winding section for both the primary and secondary sides. This construction reduces winding material, overall size and losses while providing efficient voltage transformation. The design is particularly suitable for medium- and high-voltage systems, industrial voltage conversion and grid interconnection.
For projects requiring a specific voltage ratio, capacity, cooling method or tap-changing arrangement, we provide factory-engineered solutions based on the customer's electrical system and installation conditions.
Main Parameters
|
Parameter |
Typical Specification |
|
Transformer Type |
Oil-Immersed Auto Power Transformer |
|
Rated Capacity |
Customized according to project requirements |
|
Rated Voltage |
Customized, including medium- and high-voltage applications |
|
Frequency |
50 Hz / 60 Hz |
|
Phase |
Single Phase / Three Phase |
|
Cooling |
ONAN / ONAF as required |
|
Winding |
Copper or Aluminum |
|
Tap Changer |
Off-Circuit or On-Load Tap Changer |
|
Insulating Medium |
Mineral Oil or specified insulating liquid |
|
Design Standard |
Customer-specified standard |
Construction
The transformer consists mainly of a magnetic core, common winding, series winding, insulation system, transformer tank, bushings, cooling components and protection accessories.
The common winding is shared by the input and output circuits, while the series winding provides the required voltage difference. Because part of the winding carries power through electrical conduction rather than only magnetic induction, an autotransformer can achieve a more compact structure and lower material consumption than an equivalent two-winding transformer.
For larger power ratings, optional radiators, conservator tanks, temperature indicators, Buchholz relays and other monitoring or protection devices can be configured according to the project specification.
Key Features & Advantages
Compact and Material-Efficient
The shared-winding design requires less conductor and core material, making the transformer more compact and lighter than a comparable conventional transformer when the voltage ratio is relatively close.
High Operating Efficiency
Reduced winding resistance and material consumption can contribute to lower losses, making the autotransformer attractive for high-power voltage conversion and interconnection applications.
Good Voltage Regulation
The relatively low leakage reactance of an autotransformer can provide favorable voltage regulation characteristics, particularly for suitable voltage-ratio applications.
Flexible Voltage Configuration
Step-up or step-down configurations, tap positions and voltage ratios can be engineered according to the customer's electrical requirements.
Factory Customization
Zhejiang Hengli Electrical can customize capacity, voltage ratio, winding material, cooling arrangement, tap changer and accessories for different project conditions.
Important
Because the primary and secondary circuits share a conductive winding section, an autotransformer does not provide the galvanic isolation of a conventional two-winding transformer. This factor should be considered during system protection, grounding and equipment selection.
Applications
Auto Power Transformers are commonly used for:
- Transmission and sub-transmission voltage interconnection
- Medium- and high-voltage substations
- Industrial power systems
- Voltage step-up and step-down applications
- Grid interconnection between different voltage levels
- Motor starting and industrial equipment voltage matching
- Voltage regulation and power system applications
For example, autotransformers are particularly suitable for voltage levels such as 132/66kV or other relatively close voltage ratios, where their compact design and efficient power transfer can offer practical advantages.
Project Reference
For a high-voltage interconnection project, an autotransformer can be selected where two grid sections operate at different but relatively close voltage levels. The shared-winding configuration helps reduce equipment size and material requirements while maintaining the required power-transfer capacity. The final voltage ratio, impedance, cooling method and tap-changing arrangement are determined from the project load-flow and protection requirements.
Why Choose Zhejiang Hengli Electrical?
As a transformer manufacturer in China, Zhejiang Hengli Electrical provides factory-direct transformer production and project-based customization. We support overseas buyers with technical parameter confirmation, drawing review, production, routine testing and export documentation.
Our engineering team can work from a customer's single-line diagram, transformer specification, voltage requirements or existing equipment data to recommend a suitable autotransformer configuration rather than supplying a standard model that may not match the actual system.
FAQ
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