Three Phase Oil Immersed Transformer Manufacturers – Utility Grade Supply
Subian Electric manufactures three phase oil immersed transformers from 30 kVA to 63000 kVA at our 50,000-square-metre factory in Xuzhou, Jiangsu, China. Our 350+ employees have supplied utilities and industry in 50+ countries since 2019.
As a factory-direct manufacturer and supplier, we provide three-phase oil-immersed units with factory pricing, custom configurations and complete test documentation.
Send your voltage, capacity and standard. Our export team will respond with a quotation and technical proposal.
Since 2019 · 50,000m² · 350+ Staff
Three Phase Oil Immersed Transformers We Manufacture
Three phase oil immersed transformers from 30 kVA to 63000 kVA, 6 kV to 132 kV class, for grid, industrial and commercial distribution with routine testing on every unit.
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10kV Dry-Type Transformer-SCBH series Amorphous Alloy
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20-35KV Dry-Type Transformer
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20-35KV SCB Series Epoxy Resin Dry-Type Transformer
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20KV Oil-immersed Distribution Transformer
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35KV Oil-immersed Power Transformer
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6-10KV Oil-Immersed Power Distribution Transformer
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Current Transformer –10KV Indoor High Voltage
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Current Transformer–LMZK Wound Current Transformer300/5a
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Current Transformer–LSY-10 transformer Integrated CT
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current transformer–LXK high voltage zero sequence
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dry type distribution transformer-6-10 KV SCB series epoxy resin cast
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Electrical Transformers–JDZ – 10 Power Voltage
What Is a Three Phase Oil Immersed Transformer?
A three phase oil immersed transformer converts three-phase voltage levels using oil-cooled windings, delivering economical and reliable power for distribution networks and industrial loads.
Three-phase units are the standard building block of power distribution – feeding substations, industrial plants, commercial complexes and public infrastructure with proven oil-immersed reliability.
- Three-phase design – standard vector groups Yyn0 / Dyn11 / YNd11.
- 6-132 kV class – voltage classes for distribution and sub-transmission.
- 50,000m² factory – in-house winding, vacuum drying, oil filling and testing.
- 350+ employees – engineering, production and export teams.
- Type test evidence – reports to 110 kV class for project approval.
- OEM / ODM & wholesale – custom branding, packaging and volume supply.
Main Types of Three Phase Oil Immersed Transformers
We manufacture three three-phase configurations:
Distribution type
30 kVA – 2500 kVA for pole, pad and substation distribution.
Power type
Up to 63000 kVA for regional distribution substations.
Pad-mounted type
Enclosed ground-level units for urban and commercial sites.
Three Phase Oil Immersed Transformer Specifications
| Parameter | Specification |
|---|---|
| Rated voltage | 6 kV – 132 kV class |
| Rated capacity | 30 kVA – 63000 kVA |
| Frequency | 50/60 Hz |
| Cooling | ONAN / ONAF |
| Vector group | Yyn0 / Dyn11 / YNd11 |
| Standard | IEC 60076 / GB 1094 |
Three Phase Oil Immersed Manufacturing at Our 50,000 m² Factory
From material preparation to winding, vacuum drying, oil filling, assembly and testing – every three-phase unit is built and tested at our Xuzhou facility.
Production Workshop
Controlled winding, core processing and vacuum drying with quality checkpoints between every stage, so quality is built in from the start.
Quality & Testing Center
Routine inspection on every unit before delivery, with type test reports supporting project approval and market certification.
Materials & Components
Core materials, windings and components are checked against the approved bill of materials on every production run.
OEM / ODM / Agency Supply
Custom branding, packaging and configurations for global partners – from nameplate to complete product design – supported by a dedicated export team.
Three Phase Oil Immersed Transformer Factory Price – Request a Quote
Send your specification, voltage level, capacity and quantity. Our export team will respond with factory pricing, lead time and drawings for approval.
OEM/ODM & Wholesale Three Phase Oil Immersed Transformer Supply
Distributors and utilities can brand or resell three-phase units with custom nameplates, packaging and documentation.
OEM / ODM
Factory-Direct
Custom branding, packaging and product variants built on our standard platforms – from a nameplate to full product design.
Custom nameplate · Custom packaging · Full test docs
Wholesale Supply
Volume Pricing
Factory pricing with flexible container quantities, mixed models per container and reliable global shipping for volume buyers and importers.
Container MOQ · Mixed models · Global shipping
Distributor Support
Channel Partners
Dedicated account management, technical documentation and priority production for distributors and project clients.
Account manager · Sales material · Priority lead times
Three Phase vs Single Phase Oil Immersed Transformers
Three-phase units supply balanced power to three-phase networks and industrial loads at lower cost per kVA than equivalent single-phase banks. Single-phase units serve rural and single-phase networks.
We manufacture both and recommend the configuration that matches your network and load.
Choosing a Three Phase Oil Immersed Transformer Manufacturer
Verify vacuum drying capability, type test evidence and utility reference deliveries. These factors determine transformer reliability and life.
Subian Electric offers a 50,000m² factory, 350+ employees, ISO9001, CE and UL certification and export to 50+ countries.
Request a quotation with your voltage and capacity – we confirm the design before production.
Certifications & Quality Assurance
Our three-phase oil-immersed transformers are produced under ISO9001, ISO14001 and ISO45001 management systems, with CE and UL certification and type test reports.
Product Certifications
Three Phase Oil Immersed Transformer FAQ
Common questions about three phase oil immersed transformers and factory sourcing.
What is a three phase oil immersed transformer?
What vector groups are available?
What capacities do you manufacture?
Can you build to a specific standard?
Why choose a three-phase transformer instead of three single-phase units?
What are your delivery terms?
Contact Subian
Need the Right Specification?
Tell us your target market, product type, quantity and technical requirements. Our team will help you identify a suitable configuration for your project.