Custom Cast Resin Transformers Manufacturer & Supplier
Purchasing power transformers is a crucial decision, and choosing the right transformer is even more important.
Instrava, a Chinese supplier of power transformers, offers core value by matching manufacturers to your project needs and enabling comparison of products from multiple manufacturers.
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, 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).
Descripción del transformador
Summary of the structure and characteristics of cast resin dry-type transformers.
Materials for the top outgoing terminals (HV/LV terminal) of dry-type transformers: The core depends on the current rating, temperature rise requirements, connection method (cable/busbar), cost, and corrosion resistance. Common materials include: copper, aluminum, and copper-aluminum composites (surface treatments: zinc plating, silver plating, nickel plating).
Core: A laminated silicon steel sheet structure (completed using a fully automated lamination machine). Silicon steel sheets come in three types: ordinary cold-rolled grain-oriented silicon steel sheets, high-permeability silicon steel sheets (or high-magnetic-induction silicon steel sheets), and laser-marked silicon steel sheets (different manufacturers have different advantages).
High-voltage windings: commonly cast with epoxy resin (to prevent solid insulation cracking, casting defects, and partial discharge).
Low-voltage windings: typically copper/aluminum foil windings or wire windings.
Insulation system: epoxy resin cured structure (F/H class insulation).
Cooling system: forced air cooling fan (AF).
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
Parámetros del transformador
| Engineering Parameter | Curated Performance Baselines |
| Clasificación de productos | Solid Epoxy Cast Resin Transformer |
| Rated Power Capacity Range | 300 kVA – 45 MVA |
| Primary Voltage Rating | Up to 72.5 kV |
| Secondary Voltage Rating | Up to 15 kV |
| Basic Impulse Level (BIL) | Up to 350 kV |
| Partial Discharge Performance | $\le 10\text{ pC}$ (Pico-Coulombs) |
| Insulation Core Matrix | Vacuum-Impregnated Self-Extinguishing Epoxy Resin Shell |
| Maintenance Protocol | Low to Zero Preventative Maintenance |
| Thermal Cooling Topographies | Air Natural (AN) with Optional Forced Air (AF) Fan Systems |
| Environmental Adaptability | Moisture-Proof, Anti-Fouling, and Resistant to Corrosive Atmospheres |
Instrava OEM/ODM
Abastecimiento a medida y personalización: te ofrecemos exactamente el producto que necesitas
Como tu proveedor de confianza y socio en el abastecimiento, tendemos un puente entre tus necesidades específicas y la enorme capacidad de fabricación de China.
Encontrar el producto adecuado en una cadena de suministro tan extensa puede resultar complicado. Ahí es donde entramos nosotros.
Como proveedor industrial especializado, nuestro valor fundamental es sencillo: Nos ponemos en tu lugar para ayudarte a adquirir los productos más adecuados. Tanto si eres un Contratista EPC que requiera un cumplimiento técnico especializado, un Fabricante de equipos originales (OEM) ¿Buscas una imagen de marca personalizada o un distribuidor industrial/comerciante Con el objetivo de ofrecerte una ventaja competitiva, personalizamos y adaptamos los productos para que se ajusten exactamente a tus necesidades de adquisición.
Cómo adaptamos nuestros servicios a tus necesidades de compras
Para contratistas e ingenieros de EPC: Configuramos a medida instrumentos y dispositivos para que se ajusten exactamente a sus especificaciones técnicas, adaptando las conexiones de proceso, los materiales especiales y los protocolos de señal, y gestionando la calibración y las pruebas realizadas por terceros, para que usted disponga de soluciones listas para su proyecto.
Para fabricantes de equipos originales (OEM): Ofrecemos un servicio integral de personalización OEM/ODM, que incluye carcasas a medida, etiquetado, marca propia (marca privada) y especificaciones técnicas adaptadas para que se integren a la perfección con su maquinaria.
Para distribuidores y comerciantes industriales: Ofrecemos opciones de personalización flexibles en cuanto a embalajes, gamas de productos y parámetros técnicos, lo que te ayudará a diferenciar tu cartera de productos y a ganar más licitaciones locales.
¿Por qué colaborar con nosotros en el abastecimiento a medida?
Servicio integral de alineación de ingeniería: No tendrás que tratar con varias fábricas. Nos encargamos de plasmar tus requisitos técnicos en planos de fabricación precisos.
Estrictas medidas de garantía de calidad y cumplimiento: Supervisamos todo el proceso de personalización y producción en China, garantizando que el producto final personalizado cumpla con las normas y certificaciones locales.
Nuestro valor fundamental: No nos limitamos a vender lo que hay en las estanterías. Buscamos, personalizamos y entregamos el el producto más adecuado y rentable para tu aplicación específica.
Recomendaciones de productos relacionados
What is the process for purchasing dry-type transformers from Instrava?
1. Consulta (Responderemos a tu consulta en un plazo de 24 horas para confirmar las especificaciones e iniciar el proceso.)
2. Presupuesto (Los plazos para la elaboración del presupuesto varían en función del tipo de proyecto y de sus requisitos específicos. Los artículos en stock estándar se presupuestan en el plazo de un día, mientras que los pedidos especiales requieren tres días o un plazo acordado mutuamente).
3. Selección de productos (Le presentaremos entre 3 y 5 opciones de productos y sus precios para que los apruebe. Durante esta fase, verificamos la capacidad de producción del fabricante y las certificaciones nacionales pertinentes).
4. Contrato, pago por adelantado y producción (Se requiere un pago por adelantado 40% para iniciar la producción en una instalación homologada. En el caso de los artículos en stock, nos encargamos de organizar sin demora las pruebas y el embalaje del producto).
5. Pago a cuenta (Una vez finalizada con éxito la producción y la inspección de calidad, se abonará el siguiente 50% del importe total. En el caso de los artículos en stock, este pago se realiza una vez finalizado el embalaje. Si el importe de la transacción no supera los $50 000, se abona el 60% restante.)
6. Envío (Puede designar a un agente de transporte o, si lo prefiere, nosotros podemos encargarnos del envío por usted.)
7. Recepción de la mercancía (Nuestra garantía de calidad: cuando el valor acumulado de tu pedido alcance los $50 000, solo tendrás que pagar los 10% restantes tras recibir y comprobar la calidad del producto. Dejamos que nuestra calidad hable por sí misma.)
8. Servicio posventa (Atendemos y resolvemos activamente los problemas a través de canales tanto online como offline. Concedemos gran importancia al servicio posventa, ya que refleja nuestra responsabilidad y nuestra reputación, que constituyen la base del crecimiento a largo plazo de Instrava).
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.
In which scenarios can dry-type transformers be used?
1. High-Density Commercial and Public Buildings
Because they are self-extinguishing and pose zero fire hazard, dry-type transformers can be safely installed indoors and on upper floors of buildings without the need for expensive fireproof vaults or oil-catch basins.
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Skyscrapers & Office Towers: Placed in basement or mid-floor substations to deliver stable voltage closer to the load centers.
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Shopping Malls & Exhibition Centers: High-foot-traffic areas requiring maximum fire safety.
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Hospitals & Medical Centers: Where oil fumes, leaks, or fire hazards cannot be tolerated.
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Airports, Subways, & Railway Stations: Underground and enclosed transit hubs rely entirely on dry-type systems to ensure passenger safety in case of an electrical fault.
2. Industrial Plants with High Safety & Process Standards
In heavy industry, unexpected downtime or contamination can cost millions. Dry-type transformers thrive in harsh but fire-sensitive environments.
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Data Centers: Modern AI and cloud infrastructure require massive power densities. Dry-type transformers are placed directly on the server floors to reduce low-voltage cable losses.
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Automotive & Electronics Factories: Cleanrooms and precision manufacturing lines utilize dry-type transformers to avoid any risk of oil mist contamination.
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Plantas químicas y petroquímicas: Used in non-hazardous control zones where mitigating fire risk is crucial.
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Mining & Tunnels: Enclosed spaces where ventilation is limited and smoke from a potential oil fire would be catastrophic.
3. Renewable Energy and Grid Infrastructure
As the world shifts toward green energy, infrastructure components must match the environmental benefits of the source.
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Wind Power Turbines: Compact cast resin transformers are installed directly inside the tower base or the nacelle because they can withstand vibration and climatic fluctuations without leaking fluid.
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Solar (PV) Power Plants: Stepping up inverter voltage for grid connection in arid, high-temperature solar farms.
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Urban Substations: Replacing older oil-filled units in residential areas to eliminate soil and groundwater contamination risks.
4. Marine and Offshore Applications
Salt spray, high humidity, and constant movement create a highly corrosive and stressful environment for electrical gear.
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Offshore Drilling Platforms & Oil Rigs: Space is premium, and fire at sea is a worst-case scenario. Dry-type units with special anti-corrosion coatings are mandatory here.
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Commercial Vessels & Cruise Ships: Providing safe power distribution across propulsion and luxury hospitality decks.
How do I choose the right dry-type transformer?
Choosing the right dry-type transformer requires balancing your facility’s electrical load requirements with its environmental conditions. Because dry-type transformers rely on ambient air for cooling rather than oil, matching the transformer specifications to the exact installation environment is critical to preventing premature insulation breakdown.
Here is a step-by-step engineering and procurement guide to selecting the right unit:
1. Determine Key Electrical Specifications
Before looking at environmental features, you must establish the baseline electrical parameters required by your system.
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KVA Rating (Capacity): Calculate your total connected load and add a safety margin (typically 20-30%) to accommodate future expansion and inrush currents from motors or heavy machinery.
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Primary and Secondary Voltage: Identify your source voltage (e.g., 11kV, 22kV, 33kV) and the required output voltage for your equipment (e.g., 400V, 415V, 480V).
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Frecuencia: Standard frequency is either 50 Hz (common in Europe, Asia, Africa) or 60 Hz (Americas).
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Phase: Determine if your application requires a Single-Phase or Three-Phase transformer.
2. Choose the Insulation Class and Temperature Rise
Dry-type transformers are rated by their insulation system’s ability to withstand heat. Operating a transformer beyond its thermal limits will rapidly degrade its lifespan.
The industry standards (such as IEC or IEEE) categorize insulation by maximum allowable temperatures:
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Class F (155°C): Allows for a temperature rise of 100°C over a 40°C ambient atmosphere. This is a highly cost-effective standard for general industrial and commercial indoor applications.
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Class H (180°C): Allows for a 125°C or 150°C temperature rise. This is the gold standard for heavy-duty industrial environments, data centers, and areas with fluctuating or high ambient temperatures because it offers a larger thermal safety buffer.
3. Select the Manufacturing Technology: Cast Resin vs. VPI
There are two primary ways dry-type transformers are manufactured. Your environmental conditions dictate which one you need.
Cast Resin (Crushed Quartz/Epoxy Encapsulated)
The windings are completely encapsulated in epoxy resin under a vacuum.
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Best For: Harsh, humid, or highly polluted environments. It prevents moisture absorption entirely.
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Ventajas clave: Heavy-duty short-circuit resistance, self-extinguishing in fire, and near-zero maintenance.
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Typical Scenarios: High-rise buildings, subways, offshore platforms, chemical plants, and tropical climates.
VPI (Vacuum Pressure Impregnated)
The windings are made with high-temperature insulation tape/sheets and dipped in a polyester varnish under vacuum pressure.
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Best For: Clean, dry indoor environments with strict budget constraints.
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Ventajas clave: Lower initial cost, lighter weight, and slightly easier to repair in some configurations.
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Typical Scenarios: Standard indoor commercial electrical rooms, clean manufacturing facilities, and schools.
4. Evaluate the Enclosure Protection Rating (IP Code)
Because dry-type transformers require airflow to cool down, the enclosure must protect the live components from dust and water without choking the ventilation.
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IP00 (No Enclosure): Suitable only if the transformer is being installed inside an existing, locked, and well-ventilated switchgear cabinet or a dedicated, secure electrical vault.
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IP20 / IP21: Standard indoor enclosure. Protects against solid objects larger than 12mm (like fingers) but offers no protection against liquid ingress. Ideal for typical commercial building basements.
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IP23: Offers the same protection as IP20 but adds protection against spraying water (up to 60° from vertical). Used in environments where condensation or occasional dripping might occur.
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IP31 to IP44: Higher protection levels for dusty or damp indoor industrial spaces. Anything higher usually requires a specialized air-to-air heat exchanger.
5. Factor in Cooling Requirements: AN vs. AF
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AN (Air Natural): The transformer relies solely on natural air convection. It operates at its baseline 100% rated capacity.
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AF (Air Forced): The enclosure is fitted with cooling fans. Turning on the fans can increase the continuous power output capability of a cast resin transformer by 25% to 40%.
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Procurement Tip: Always buy a unit with an AN/AF rating. This allows the transformer to run silently under normal loads (AN) while giving you emergency reserve capacity (AF) during peak demand spikes or summer heatwaves.
What makes the insulation system of a cast resin transformer self-extinguishing during a facility fire?
The insulation system is self-extinguishing because the chemical composition of the premium epoxy resin includes fire-retardant properties that prevent it from acting as a fuel source. If an external arc or building fire compromises the substation, the cast resin shell will resist ignition and will not propagate open flames. Once the external flame source is removed, the epoxy matrix naturally extinguishes itself, eliminating toxic smoke emissions and securing critical safety zones.
¿Por qué confiar en Instrava?
Seleccionamos a los fabricantes desde un punto de vista neutral e imparcial, teniendo siempre en cuenta tus intereses.
Nuestra propia existencia depende de que te ayudemos a encontrar los productos que mejor se adapten a tus necesidades.
Al tener nuestra sede en China, podemos realizar inspecciones in situ de los entornos de producción y comprobar de primera mano la calidad de los productos.
Te ayudamos a evitar a los intermediarios que se hacen pasar por fábricas.
Facilitamos una atención posventa más fluida, eliminando los problemas relacionados con las diferencias horarias y los retrasos que suelen producirse al tratar directamente con las fábricas.
Nuestro equipo multilingüe garantiza una comunicación eficaz.
Para una startup dedicada al trading, cada interacción con un cliente es una oportunidad muy valiosa: una señal de que estás dispuesto a depositar tu confianza en nosotros y a darnos la oportunidad de demostrar nuestra valía.
En la era digital, aunque se puede acceder fácilmente a la información, los conceptos erróneos suelen enturbiar la confianza entre las personas.
Instrava se basa por completo en la confianza; es nuestra filosofía fundamental y el pilar de nuestra existencia en la sociedad. Es la base fundamental de nuestro crecimiento a largo plazo y de nuestro compromiso de servir a la comunidad.
Por favor, confía en nosotros.
