Distribution Transformer Oil Type Manufacturers – Oil-Immersed Factory Supply
Subian Electric manufactures oil immersed distribution transformers from 6 kV to 132 kV class at our 50,000-square-metre factory in Xuzhou, Jiangsu, China. Our 350+ employees have supplied power grids, utilities and industry in 50+ countries since 2019.
As a factory-direct manufacturer and supplier, we provide oil-type distribution transformers 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
Oil Immersed Distribution Transformers We Manufacture
Oil-type distribution transformers from 6 kV to 132 kV class, 30 kVA to 63000 kVA – pole-mounted, pad-mounted and substation designs with ONAN/ONAF cooling.
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Transformador de tipo seco de 10kV - serie SCBH Aleación Amorfosa
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Transformador de tipo seco de 20-35KV
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Transformador de tipo seco de resina epóxica serie SCB de 20-35KV
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Transformador de distribución sumergido en aceite de 20KV
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Transformador de Potencia Sumergido en Aceite de 35KV
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Transformador de distribución de potencia sumergido en aceite de 6-10KV
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Transformador de Corriente –10KV Interior Alta Tensión
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Transformador de corriente–Transformador de corriente enrollado LMZK 300/5a
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Transformador de corriente–LSY-10 transformador CT integrado
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transformador de corriente–LXK secuencia cero de alta tensión
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transformador de distribución de tipo seco - serie SCB de resina epóxica de 6-10 KV
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Transformadores eléctricos–JDZ – 10 Voltaje de potencia
What Is an Oil Type Distribution Transformer?
An oil type distribution transformer uses mineral oil for insulation and cooling, making it the most economical and widely used transformer technology for outdoor distribution. The oil dissipates heat and provides dielectric strength, allowing high capacity in a compact tank.
Utilities and industrial sites around the world rely on oil-immersed distribution transformers for pole, pad and substation installations. They deliver proven reliability, low first cost and easy maintainability over decades of service.
- 6-132 kV class – oil-immersed units for pole, pad and substation duty.
- Proven technology – the world standard for outdoor distribution.
- 50,000m² factory – in-house winding, vacuum drying and testing.
- 350+ employees – engineering, production and export teams.
- Type test evidence – power frequency and impulse reports to 110 kV class.
- OEM / ODM & wholesale – custom branding, packaging and volume supply.
Main Types of Oil Immersed Distribution Transformers
We manufacture three oil-type configurations:
Pole-mounted
Compact single-phase and three-phase units for rural and overhead networks.
Pad-mounted
Enclosed ground-level units for urban and commercial distribution.
Substation type
Larger units for distribution substations up to 132 kV class.
Oil Immersed Distribution Transformer Specifications
| Parámetro | Specification |
|---|---|
| Voltaje nominal | 6 kV – 132 kV class |
| Capacidad nominal | 30 kVA – 63000 kVA |
| Frecuencia | 50/60 Hz |
| Refrigeración | ONAN / ONAF |
| Grupo vectorial | Yyn0 / Dyn11 |
| Estándar | IEC 60076 / GB 1094 |
Oil Immersed Transformer Manufacturing: Full Factory Control
From material preparation to winding, vacuum drying, oil filling, assembly and testing – every 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.
OEM/ODM & Wholesale Oil Immersed Transformer Supply
Distributors and utilities can brand or resell oil-type 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
Oil Immersed vs Dry Type Distribution Transformers
Oil-immersed units offer the lowest cost per kVA and suit outdoor, high-capacity duty, but need oil containment and periodic oil maintenance. Dry-type units remove those needs at higher first cost.
For utility and outdoor distribution, oil type remains the standard – our engineers confirm the right technology for your project.
Oil Type Distribution Transformer Manufacturers & Suppliers: How to Choose
Compare manufacturers on type test evidence, vacuum drying capability and reference deliveries to utilities. These factors determine transformer life and reliability.
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, capacity and standard – we confirm the design on drawings before production.
Certifications & Quality Assurance
Our oil-immersed transformers are produced under ISO9001, ISO14001 and ISO45001 management systems, with CE and UL certification and type test reports to 110 kV class.
Product Certifications
Oil Type Distribution Transformer FAQ
Common questions about oil immersed distribution transformers and factory sourcing.
¿Por qué están llenos de aceite los transformadores de distribución?
What is the difference between ONAN and ONAF cooling?
What oil is used?
What maintenance does an oil transformer need?
Do you provide type test reports?
What is the minimum order quantity?
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.