Custom Three-Phase Oil-Type Distribution Transformer Supplier
As a global B2B supplier, rather than a single manufacturer, Instrava’s core value lies in its professional product sourcing.
For distribution transformers, we can customize capacity, voltage, and form factor to suit your project.
As a supplier, all product certifications are met, including CE, UL, and TUV.
Quotation time: 1-3 work days for standard voltage and functional projects; 3-7 work days for special projects (high voltage, customized functions).
Delivery time: 60-90 days (depending on quantity and project requirements).
Transformer Description
Structure of Main Distribution Transformers
Core: The core assembly process—from handling silicon steel to the finished core—is fully automated. Materials used include silicon steel, as well as amorphous alloys, Permalloy, nanocrystalline alloys, soft magnetic ferrites, and iron-aluminum alloys.
Windings: Winding fabrication involves a combination of manual and machine-based processes. Options include copper, aluminum, or copper-aluminum composite materials.
Oil Tank: A critical component for heat dissipation.
Gas Relay: Serves as the primary protection device against internal transformer faults; it is installed in the connecting pipe between the oil tank and the conservator. In the event of a severe internal fault, the relay triggers the circuit breaker trip circuit; for minor internal faults, it activates the fault signal circuit.
Insulating Bushings: High- and low-voltage bushings are located on the top cover of the transformer tank; oil-immersed transformers typically utilize porcelain bushings. These bushings ensure effective insulation between the high- and low-voltage winding leads and the tank, while also securing the leads in place.
Application Classification of Oil-Immersed Transformers
| Application Category | Typical Product Types | Main Applications |
|---|---|---|
| Power Transmission & Distribution | Distribution Transformers, Step-up Transformers, Step-down Transformers | Power grids, substations, utility power systems, urban power distribution |
| Industrial Power Supply | Industrial Oil-immersed Transformers, Medium Voltage Transformers | Manufacturing plants, mining, steel, cement, chemical, and heavy industries |
| Renewable Energy Applications | Solar Transformers, Wind Power Transformers, Energy Storage Transformers | Solar power plants, wind farms, battery energy storage systems (BESS) |
| Infrastructure Applications | Power Transformers, Distribution Transformers | Airports, railways, ports, urban infrastructure projects |
| Commercial & Building Power Supply | Compact Oil-immersed Distribution Transformers | Commercial buildings, shopping centers, large facilities, building power systems |
| Data Center Power Applications | Medium Voltage Oil-immersed Transformers, Dedicated Distribution Transformers | Data centers, cloud computing facilities, AI computing infrastructure |
| Mining Applications | Mining Transformers, Mobile Transformers | Coal mines, metal mines, open-pit mining operations |
| Oil & Gas Applications | Industrial Transformers, Hazardous Area Transformers | Refineries, oil fields, gas processing plants, offshore platforms |
| Rail Transit Applications | Traction Transformers, Auxiliary Transformers | High-speed rail, metro systems, electrified railway networks |
| Marine & Offshore Applications | Marine Oil-immersed Transformers | Ships, offshore platforms, marine power systems |
| Special Industrial Applications | Rectifier Transformers, Furnace Transformers, Arc Furnace Transformers | Electrolysis plants, electric furnaces, metallurgical industries |
Transformer Parameter
|
Model Number
|
oil immersed transformer
|
|
Phase
|
Three
|
|
Coil Number
|
3
|
|
Usage
|
power
|
|
Coil Structure
|
layer coil
|
|
Rated Primary Voltage
|
11
|
|
Rated Secondary Voltage
|
0.415
|
|
Power
|
100kva
|
|
Rated capacity
|
30-3000kva
|
|
Frequency
|
50/60Hz
|
|
Material
|
Copper/aluminum
|
|
Input Voltage
|
10kv-35kv
|
|
Output Voltage
|
200v/220/240/380v/400v/415v/440v
|
|
Color
|
Grey
|
|
Certification
|
ISO9001
|
|
Winding material
|
100%Copper
|
|
Cooling Method
|
ONAN
|
|
Vector Group
|
Dyn11/Yyn0/Yd11/YNd11
|
| 10kv-35kv Distribution Transformer | ||||||
| Rated Power(kva) | High Voltage(kv) | Low Voltage(kv) | Connection symbol | No-load loss(w) | On-load loss(w) | No load current(%) |
| 400kva | 10kv 11kv 20kv 35kv |
0.4 | Ydn11 Yyn0 |
570 | 4300 | 0.45 |
| 500kva | 680 | 5410 | 0.45 | |||
| 630kva | 810 | 30800 | 0.4 | |||
| 800kva | 980 | 7500 | 0.4 | |||
| 1000kva | 1150 | 10300 | 0.35 | |||
| 1250kva | 1360 | 12000 | 0.3 | |||
| 1600kva | 1640 | 145000 | 0.6 | |||
| 2000kva | 1950 | 19140 | 0.6 | |||
| 2500kva | 2340 | 22220 | 0.5 | |||
Instrava OEM/ODM
Tailored Sourcing & Customization: Getting You the Exact Product You Need
As your trusted supplier and sourcing partner, we bridge the gap between your custom requirements and China’s vast manufacturing capabilities.
Finding the right product in a massive supply chain can be challenging. That is where we step in.
As a curated industrial supplier, our core value is simple: we stand in your shoes to help you procure the most optimal products. Whether you are an EPC contractor needing specialized technical compliance, an OEM equipment manufacturer looking for custom branding, or an industrial distributor/trader seeking competitive edge, we customize and tailor products to fit your exact procurement needs.
How We Customize to Fit Your Procurement Needs
For EPC Contractors & Engineers: We custom-configure instruments and devices to match your precise datasheets—tailoring process connections, exotic materials, signal protocols, and managing third-party calibration and testing so you get project-ready solutions.
For OEM Equipment Manufacturers: We provide comprehensive OEM/ODM customization, including custom housing, labeling, branding (private labeling), and tailored technical specifications to seamlessly integrate with your machinery.
For Industrial Distributors & Traders: We offer flexible customization in packaging, product ranges, and technical parameters, helping you differentiate your portfolio and win more local bids.
Why Partner with Us for Custom Sourcing?
One-Stop Engineering Alignment: You don’t have to deal with multiple factories. We translate your technical requirements into precise manufacturer blueprints.
Strict Quality & Compliance Safeguard: We oversee the entire customization and production process in China, ensuring the final customized product meets your local standards and certifications.
Our Ultimate Value: We don’t just sell what’s on the shelf. We find, customize, and deliver the most suitable and cost-effective product for your unique application.
What is the process for purchasing oil immersed transformers from Instrava?
1. Inquiry (We will respond to your inquiry within 24 hours to confirm specifications and initiate the process.)
2. Quotation (Quotation timelines vary based on the project type and your specific requirements. Standard stock items are quoted within one day, while special orders require three days or a mutually agreed-upon timeframe.)
3. Product Selection (We will present 3–5 product options and pricing for your approval. During this stage, we verify the manufacturer’s production capabilities and relevant national certifications.)
4. Contract, Prepayment, and Production (A 40% prepayment is required to initiate production at a qualified facility. For stock items, we promptly arrange for product testing and packaging.)
5. Interim Payment (Upon successful completion of production and quality inspection, the next 50% of the total amount is due. For stock items, this payment is made after packaging is complete.If the transaction amount does not exceed $50,000, the remaining 60% is paid.)
6. Shipment (You may designate a freight forwarder, or we can arrange shipping for you.)
7. Receipt of Goods (Our Quality Guarantee: When your cumulative order value reaches $50,000, you pay the remaining 10% only after receiving and verifying the product quality. We let our quality do the talking.)
8. After-Sales Service (We actively address and resolve issues through both online and offline channels. We place great importance on after-sales support, as it reflects our responsibility and reputation—the foundation of Instrava’s long-term growth.)
What are the advantages of buying oil transformers from Instrava suppliers?
Compared to factories, we offer a more objective and impartial assessment of the advantages and disadvantages of our products compared to those from different manufacturers. We provide you with a wider selection of types, ensuring the best cost-effectiveness for your project. Our 3-5% service fee saves you significant time in finding and comparing products.
What types of transformers can I buy from Instrava?
Dry-type transformers, low-voltage small oil-immersed distribution transformers below 35KV, high-voltage transformers above 66KV-220KV (if higher voltage such as 500KV is required, detailed communication is needed), pole-mounted transformers, pad-mounted transformers, box-type transformers, UPS transformers, rectifier transformers, frequency converter transformers and other multi-purpose transformers.
How does a 10kv input voltage profile benefit industrial and commercial facility infrastructures?
A 10kv input voltage profile allows large-scale facilities to connect directly to medium-voltage utility distribution lines, reducing line current and minimizing voltage drops across long distances. By accepting a 10KV supply and stepping it down locally via a 630kVA transformer, plants can optimize their power factor, avoid high-voltage line losses, and secure lower industrial energy tariffs from utility providers.
What makes this 630kVA three-phase transformer classification a “low-loss” energy solution for smart facilities?
This transformer achieves its low-loss status by combining precision-cut grain-oriented silicon steel cores with premium copper windings to reduce both no-load and load losses. The multi-layered core architecture minimizes magnetic hysteresis and eddy currents when the unit is energized but idling, while the high-purity copper conductors keep resistive losses at absolute minimums during full-capacity 630kVA operation.
How does the step-down architecture in a three-phase oil distribution transformer protect terminal machinery?
The step-down architecture protects terminal machinery by converting volatile, high-amplitude 10KV grid power into a highly stable, regulated low-voltage output. The physical separation between the primary and secondary windings acts as a dampening barrier against grid-side voltage transients, while the three-phase distribution network balances the current load evenly across all lines, preventing harmful phase voltage imbalances from damaging downstream motors and automated equipment.
Why Trust Instrava?
We select manufacturers from a neutral, impartial standpoint, always with your best interests in mind.
Our very existence depends on helping you source the products that are the perfect fit for your needs.
Based in China, we are able to conduct on-site inspections of production environments and product quality firsthand.
We help you avoid intermediaries posing as factories.
We facilitate smoother after-sales support, eliminating time zone issues and the delays often associated with dealing directly with factories.
Our multilingual team ensures effective communication.
For a trading startup, every interaction with a client is a precious opportunity—a sign that you are willing to place your trust in us and give us the chance to prove ourselves.
In the digital age, while information is easily accessible, misconceptions often cloud the trust between people.
Instrava relies entirely on trust; it is our core philosophy and the foundation of our existence in society. It is the fundamental basis for our long-term growth and our commitment to serving the community.
Please place your trust in us.
