Buy 220 kv 230kv High Voltage Oil immersed Power Transformer in China Supplier
For power grids, large-scale substations, and sectors such as mining or petrochemicals—where long-term energy efficiency and grid safety are paramount—procuring high-voltage 220kV/230kV transformers is a critical decision. These assets are vital to essential industries and represent a long-term strategic investment.
Although Instrava operates as a trading supplier rather than a manufacturer, our core value lies in our exceptional engineering-led vetting process. We rigorously evaluate manufacturing resources in China, selecting only those power equipment manufacturers that possess comprehensive qualifications, advanced facilities, and a skilled workforce.
We can meet your specific customization needs, project requirements, and product certification standards by leveraging China’s vast manufacturing market.
Our delivery lead times are significantly shorter than those of European or American companies.
Transformer Description
Advantages of choosing Chinese-made power transformers-1
Complete Industrial Chain Support: From upstream silicon steel, copper, and insulation materials to downstream complete machine manufacturing and testing equipment, the entire process is independently controllable. Raw material response speed and supporting costs are significantly superior to those in Europe, America, and Japan.
Scalability and Delivery Efficiency: Possessing the world’s largest single-plant production base, with an annual production capacity of tens of millions of kVA, enabling “factory prefabrication + rapid assembly,” shortening delivery cycles by 30%-50% compared to international counterparts, and adapting to urgent overseas orders.
Technological Maturity and Reliability: 220kV/230kV is the standard voltage for the domestic power grid, and the manufacturing process is extremely mature. Some companies have achieved breakthroughs in 230kV high seismic resistance, low noise, vegetable oil environmental protection, and first-class energy efficiency technologies, setting an industry record of “zero failures upon first commissioning” for hundreds of units.
Cost and Cost-Effectiveness: Under the same parameters, the overall cost is 20%-30% lower than imported products, and customized designs (such as special seismic resistance and high-altitude adaptation) are supported, combining high performance and price advantages.
Full coverage of international standard certifications: Products from leading mainstream companies have passed IEC, KEMA, ASTA, and CE certifications, meeting the power grid standards of Europe, the United States, and many countries along the Belt and Road Initiative. Exports surged by 36% year-on-year in 2025.
Key capabilities of China in manufacturing high-voltage transformers are demonstrated.
Breakthrough in High-End Manufacturing: Mastering technologies such as fully insulated windings, low partial discharge (≤10pC), high short-circuit withstand capability, and intelligent temperature control; some products are designed with a lifespan of up to 40 years.
Leading in Green and Energy-Saving Technology: Widely adopting Class 1 energy-efficient amorphous alloys or low-loss silicon steel solutions, reducing no-load losses by 60%-70% compared to traditional products, aligning with the global trend towards carbon neutrality.
Adaptable to Specialized Scenarios: Providing customized solutions for high overload, fireproof, explosion-proof, and strong seismic resistance for scenarios such as new energy power plants, data centers, rail transit, and overseas earthquake zones. Note: 230kV is often used as a voltage level for specific export markets (such as South America and some Asian countries) or special engineering projects. Chinese manufacturers can flexibly adapt to 220kV production lines for customized production without the need to rebuild production lines.
Transformer Parameter
| Feature / Technical Parameter | Engineered Specifications |
| Product Classification | High Voltage Special Oil-Immersed Power Transformer |
| Primary Voltage Rating | 220 kV / 230 kV (Fully Customizable to Regional Grids) |
| Secondary Voltage Ratings | 6.3 kV, 10.5 kV, 11 kV, 33 kV, 35 kV, 69 kV (Fully Customizable) |
| Power Capacity Range | 6,300 kVA to 200 MVA |
| Core Processing & Cut Line | Top-Grade Hi-B Silicon Steel via CNC GEORG Cutting Lines |
| Winding Matrix Engineering | Premium Oxygen-Free Copper Coils / Self-Adhesive Transposed Conductors |
| Structural Alignment | Six-Sided Assembly Positioning |
| Drying & Filling Processing | Kerosene Vapor Phase Drying (VPD) / Full Vacuum Oil-Filling |
| Connection Vector Groups | YNd11 / YNyn0 (Other Configurations Available Upon Request) |
| Cooling Medium | High-Dielectric Mineral Insulation Oil |
| Design Life Profile | 30-Year Maintenance-Free Lifespan via Specially Sealed Tank Design |
| International Quality Marks | ISO 9001, ISO 14001, CE, SGS, UL |
| Applicable Standards | IEC Series, ANSI / IEEE, CSA / CAN |
| Main Technical Parameters for oil-immersed power transformer | ||||||||
| Rated Power(kva) | High Voltage(kv) | H.V.Tap range | Low Voltage(kv) | Connection symbol | Short Circuit Impendence | No-load loss(kw) | On-load loss(kw) | No-load current(%) |
| 6300 | 63 66 69 110 132 138 220 |
±8x 1.25% |
6.3 6.6 10.5 11 33 69 |
YNd11 YNyn0 others |
10-14 | 9.4 | 34 | 0.63 |
| 8000 | 11.2 | 40.4 | 0.63 | |||||
| 10000 | 13.1 | 47.6 | 0.75 | |||||
| 12500 | 15.4 | 56.5 | 0.53 | |||||
| 16000 | 18.5 | 69.5 | 0.49 | |||||
| 20000 | 21.8 | 84.2 | 0.49 | |||||
| 25000 | 25.6 | 99.5 | 0.4 | |||||
| 31500 | 30.4 | 120 | 0.4 | |||||
| 40000 | 36.2 | 140.3 | 0.39 | |||||
| 50000 | 42.6 | 174.3 | 0.39 | |||||
| 63000 | 52 | 210 | 0.39 | |||||
| 75000 | 60 | 238 | 0.49 | |||||
| 90000 | 69 | 274 | 0.49 | |||||
| 120000 | 85 | 328 | 0.46 | |||||
| 150000 | 101 | 385 | 0.42 | |||||
| 160000 | 105 | 404 | 0.42 | |||||
| 180000 | 115 | 436 | 0.42 | |||||
| 240000 | 144 | 539 | 0.4 | |||||
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 power 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 power 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.
What are the long-term economic benefits of a 30-year maintenance-free transformer tank sealing structure?
The primary economic benefit is the near-total elimination of recurring operational expenditure (OPEX) associated with oil filtration, dehydrating breather replacements, and scheduled downtime. Instrava’s curated 220kV/230kV units utilize a fully enclosed oil tank equipped with a specialized sealing structure. This absolute seal prevents atmospheric moisture and oxygen from contacting the mineral oil, halting the chemical aging of both the fluid and paper insulation to guarantee a 30-year operational life without routine fluid reconditioning.
How does a core made with Hi-B silicon steel and cut on GEORG lines enhance substation performance?
A core engineered with top-grade Hi-B silicon steel and cut on CNC-controlled GEORG cutting lines maximizes transformer efficiency while minimizing magnetic hum. Hi-B silicon steel laminations possess exceptional magnetic permeability, which drastically lowers core and hysteresis losses. Precision CNC-milled cutting and rounding eliminate microscopic burrs and gaps at the joints, ensuring optimal magnetic flux distribution and significantly lower audible noise levels inside municipal or industrial substations.
Which connection groups and international standards are compatible with this 220kV/230kV high-voltage line?
This high-voltage transformer line is fully compatible with standard global utility architectures, supporting YNd11 and YNyn0 connection vector groups, alongside completely customizable primary and secondary configurations. To ensure seamless transnational grid integration, the series conforms to all major international grid codes and engineering criteria, including IEC, ANSI/IEEE, and CSA/CAN standards, backed by ISO 9001, ISO 14001, CE, SGS, and UL certifications.
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.
