3-Phase Power Autotransformer Bulk Procurement
Bulk procurement of transformers is a critical task that impacts overall business development.
As a supplier, Instrava offers a curated selection of transformers; our core value lies in presenting products that are the best fit for our clients’ projects, based on an objective and impartial assessment.
Our products offer reliable performance and regulatory compliance, meeting standards such as IEC 60076, CE, UL/CSA, RoHS, and CSA.
Bulk customization of low-voltage autotransformers offers a cost-effective solution; we can customize units for step-up or step-down applications, as well as for specialized industry power conversion requirements.
These are standard transformer models; quotations are typically provided within 1–2 business days, with a delivery lead time of 30–45 days.
Transformer Description
Autotransformer Structure
Core: High-permeability silicon steel sheets / Cold-Rolled Grain-Oriented (CRGO) silicon steel
(Three-phase: three-limb core; Single-phase: EI-type, toroidal, or C-core)
Winding: Common winding (shared by high and low voltage) and series winding (connected in series with the input voltage).
Insulation System: Epoxy resin casting / Vacuum Pressure Impregnation (VPI)
Cooling System: AN/AF
Monitoring: PT100 temperature sensor / temperature controller
Enclosure: Powder-coated carbon steel / stainless steel / aluminum alloy
Main Application Categories of Autotransformers
| Application Area | Typical Use | Typical Capacity |
|---|---|---|
| Motor Starting | Reduced-voltage motor starting to reduce starting current and mechanical stress | kVA to MVA |
| Industrial Power Distribution | Voltage conversion and power supply matching for industrial equipment | kVA to MVA |
| Power Transmission | High-voltage transmission voltage transformation and grid interconnection | 100 MVA and above |
| Data Centers | Power distribution voltage conversion and high-efficiency power supply systems | MVA level |
| Railway Systems | Autotransformer (AT) traction power supply systems | MVA level |
| Renewable Energy | Voltage step-up and grid connection for wind farms, solar plants, and energy storage systems | MVA level |
| Laboratory & Testing Equipment | Adjustable voltage supply and voltage regulation applications | Small capacity |
Transformer Parameter
| Parameter | Specification |
|---|---|
| Product Name | 3-Phase Autotransformer |
| Transformer Type | Auto Transformer |
| Voltage Configurations | 600V / 480V / 400V / 240V / 208V |
| Voltage Conversion | Step-Up or Step-Down |
| Phase Configuration | Three Phase |
| Frequency | 60 Hz |
| Winding Material | Copper |
| Insulation Class (3–15 kVA) | 130°C |
| Insulation Class (30–225 kVA) | 220°C |
| Temperature Rise (3–15 kVA) | 80°C |
| Temperature Rise (30–225 kVA) | 150°C |
| Insulation System | Class F |
| Encapsulation | Fully Resin Encapsulated (Up to 15 kVA) |
| Winding Treatment | Vacuum Pressure Impregnated (VPI) |
| Enclosure Type | NEMA 3R Indoor / Outdoor |
| Mechanical Lugs | Included up to 75 kVA |
| Certifications | UL Approved, CSA Approved |
| Installation Environment | Indoor and Outdoor Applications |
| Voltage Regulation | Precision Autotransformer Design |
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 autotransformer 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.
What does Vacuum Pressure Impregnation (VPI) provide?
VPI technology improves transformer durability by thoroughly impregnating the winding insulation with resin under vacuum and pressure conditions.
Benefits include:
- Increased moisture resistance
- Improved dielectric strength
- Better mechanical stability
- Extended service life
Is this transformer UL and CSA approved?
Yes. The transformer is manufactured to meet UL and CSA requirements, helping ensure compliance with North American electrical standards and installation requirements.
How do I determine the correct transformer size?
Transformer sizing should consider:
- Total connected load
- Continuous operating demand
- Motor starting currents
- Future expansion requirements
- Voltage conversion requirements
Proper sizing improves efficiency, reliability, and equipment protection.
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.
