Curated Purchase Three-Phase Step-Up Dry Type Distribution Transformer
Procuring transformers is a critical task that directly impacts the overall progress of a project.
For clients, the core value of Instrava lies in its ability to supply the most suitable transformers for a given project, offering a selection of three to five tailored options.
Transformer certifications include: IEC, IEEE, CE, UL, GOST, Intertek, ETL, and TÜV Rheinland. The Chinese manufacturing market can meet these certification requirements.
Similarly, customized capacities(30kVA-2500kVA), voltage levels, and functions can also be accommodated.
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
The Engineering Behind High-Performance Cast Resin Transformers
Modern electrical infrastructure demands uncompromising safety and efficiency, which is directly reflected in the structural architecture of cast resin dry-type transformers.
At the heart of the system is a highly optimized magnetic core, constructed from precision-laminated silicon steel sheets processed via fully automated lamination lines. Depending on your project’s efficiency targets, options range from standard high-permeability CRGO sheets to laser-marked silicon steel sheets designed to slash no-load losses.
The winding technology balances dielectric strength with thermal resilience. The high-voltage windings are vacuum-cast with premium epoxy resin to prevent solid insulation cracking and eliminate partial discharge. Concurrently, the low-voltage windings employ copper or aluminum foil or wire configurations to maximize short-circuit ride-through capabilities.
For seamless field integration, the HV/LV outgoing terminals are engineered based on your specific busbar or cable connection requirements. Utilizing copper, aluminum, or bimetallic composites treated with silver, nickel, or zinc plating, these terminals guarantee low contact resistance and excellent corrosion defenses. Combined with a Class F/H insulation system and an automated Forced Air (AF) cooling fan array, these transformers deliver consistent reliability under the harshest operational profiles.
Dry-type transformer series available
Special dry-type transformer products:
Railway energy feedback transformers
Railway traction rectifier transformers
Railway bidirectional converter transformers
Polycrystalline silicon special transformers
Photovoltaic power generation dry-type transformers
Wind power generation dry-type transformers
Offshore platform dedicated dry-type transformers
Three-phase/single-phase excitation rectifier transformers
Gas-fired power generation starting isolation transformers
Pumped storage input/output transformers
Multi-pulse phase-shifting rectifier transformers
Standard dry-type transformer products:
Dry-type distribution transformers
North American standard series dry-type transformers
Amorphous alloy dry-type transformers
Railway power transformers
Transformer Parameter
| Feature / Technical Parameter | Engineered Specifications |
| Product Classification | Three-Phase Step-Up Dry Type Distribution Transformer |
| Rated Power Capacity | 500kVA 1000 kVA 1500 kVA 2000kVA 2500kVA or custom |
| Circuit Configuration | Three-Phase / Three-Leg High-Permeability Iron Core |
| Winding Topography | Vacuum-Cast Resin Potted Foil-Type Coils |
| Primary / Secondary Voltages | Fully Configurable Step-Up Profiles to Suit Project Grid Requirements |
| Thermal Insulation Classes | Class F ($155^\circ\text{C}$) / Class H ($180^\circ\text{C}$) High-Performance Ratings |
| Cooling Mechanisms | Air Natural (AN) / Forced Air (AF) Dynamic Ventilation |
| Integrated Thermal Management | BWDK Series Sensor Signal Thermometer with Auto-Display, Alarm & Trip |
| Mechanical Fault Resistance | High Short-Circuit Stress Dissipation via Void-Free Epoxy Casting |
| Environmental Protections | Moisture-Proof, Anti-Fouling, and Corrosive Atmosphere Resistant |
| Acoustic Profile | Engineered Low-Noise Operation Suitable for Commercial/Urban Environments |
| Operational Reliability Level | Certified to International Advanced Grid Performance Standards |
| Rated Capacity(kVA) | Voltage Combined | Vector-group | No-load Loss(W) | 75ºC Load Loss(W) |
No-load current(%) | Short-circuit Impendance(%) | ||
| High voltage(KV) | Tapping Ranges | Low voltage(KV) | ||||||
| 30 | 6
6.3 6.6 10 10.5 11 |
±5% ±2×2.5% |
0.4 | Dyn11
Yyn0 |
190 | 710 | 2.4 | 4 |
| 50 | 270 | 1000 | 2.4 | |||||
| 80 | 370 | 1380 | 1.8 | |||||
| 100 | 400 | 1570 | 1.8 | |||||
| 125 | 470 | 1850 | 1.6 | |||||
| 160 | 540 | 2130 | 1.6 | |||||
| 200 | 620 | 2530 | 1.4 | |||||
| 250 | 720 | 2760 | 1.4 | |||||
| 315 | 880 | 3470 | 1.2 | |||||
| 400 | 980 | 2990 | 1.2 | |||||
| 500 | 1160 | 4880 | 1.2 | |||||
| 630 | 1340 | 5880 | 1.0 | |||||
| 630 | 1300 | 5960 | 1.0 | 6 | ||||
| 800 | 1520 | 6960 | 1.0 | |||||
| 1000 | 1770 | 8130 | 1.0 | |||||
| 1250 | 2090 | 9690 | 1.0 | |||||
| 1600 | 2450 | 11730 | 1.0 | |||||
| 2000 | 6050 | 14450 | 0.8 | |||||
| 2500 | 3600 | 17170 | 0.8 | |||||
| 1600 | 2450 | 12960 | 1.0 | 8 | ||||
| 2000 | 3050 | 15960 | 0.8 | |||||
| 2500 | 3600 | 18890 | 0.8 | |||||
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 dry-type 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 dry-type 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.
When should an energy engineer configure a 1500kva dry type transformer with Class H insulation instead of Class F?
An engineer should specify Class H insulation when the 1500kva transformer is deployed in extreme ambient temperatures up to 180°C, high-harmonic industrial environments, or applications subject to frequent severe overloads. While Class F insulation provides exceptional thermal performance up to 155°C for standard utility networks, Class H material chemistry offers an elevated thermal cushion that prevents insulation aging and maximizes transformer operating life under intense cyclic thermal stress.
How do the combined AN and AF cooling methods optimize the operational efficiency of a step up power transformer?
The combined AN (Air Natural) and AF (Forced Air) cooling methods optimize efficiency by balancing low self-consumption with high peak-capacity cooling. Under standard operating conditions, the transformer relies entirely on passive AN natural air ventilation, consuming zero auxiliary fan power. When generation levels spike, the automated forced air (AF) system engages to accelerate heat dissipation through the resin cooling ducts, safely boosting the transformer’s continuous overload capacity without risking thermal runaway.
How does vacuum-potted resin encapsulation protect dry type transformers from moisture and fouling?
Vacuum-potted resin encapsulation protects the transformer by surrounding the foil-type coils with a thick, solid block of cured epoxy resin that eliminates microscopic air voids. This airtight, non-porous shield prevents ambient moisture, conductive dust, and airborne chemical contaminants from penetrating the windings. This eliminates the risk of internal tracking or insulation tracking flashovers, rendering the unit virtually maintenance-free in humid, coastal, or heavily polluted industrial settings.
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.
