In the modern electrical infrastructure landscape, the choice of transformer technology directly impacts safety, operational efficiency, and environmental compliance. Engineers, facility managers, and environmental advocates are increasingly shifting away from traditional oil-filled units toward air-cooled alternatives that eliminate fire hazards and reduce ecological risks. Among these, the dry-type transformer stands out as a superior solution for applications requiring high reliability in sensitive environments. Delong Electric Co., Ltd., a leading Chinese manufacturer with decades of expertise, has developed a comprehensive lineup of dry-type transformers that address these exact needs. This article explores the defining characteristics, product varieties, competitive advantages, and real-world applications of dry-type transformers, with a special focus on how Delong Electric delivers unmatched value through innovation and quality. Whether you are designing a hospital power system or upgrading a data center, understanding the nuances of this technology is essential for making informed procurement decisions.

A dry-type transformer is a type of transformer that uses air as the cooling medium instead of insulating oil, which fundamentally changes its safety profile and maintenance requirements. Unlike liquid-filled units, these devices contain no flammable fluids, making them inherently fireproof and suitable for indoor installations where fire codes are stringent. The core and windings are encapsulated in materials such as epoxy resin or varnish, which provides excellent moisture resistance and dielectric strength. This design approach also eliminates the risk of oil leaks, which can contaminate soil and groundwater, aligning with modern environmental regulations. For engineers evaluating different types of transformer, the dry variant offers distinct advantages in terms of reduced maintenance intervals, as there is no need for oil sampling, filtration, or disposal. Additionally, these transformers operate with lower noise levels compared to oil-filled alternatives, a critical factor for installations in office buildings, hospitals, and residential complexes. The dry transformer category includes several sub-types, such as cast resin (epoxy) and VPI (vacuum pressure impregnated) designs, each suited to specific environmental conditions. Delong Electric's dry-type transformers are engineered to meet international standards, including IEC 60076 11, ensuring global acceptance and reliable performance under diverse operating conditions.

Delong Electric Co., Ltd. has invested heavily in research and development to produce a range of dry-type transformers that cater to different performance requirements and environmental challenges. Each series is built with premium materials and advanced manufacturing processes, ensuring that customers receive equipment that delivers long service life and stable operation. The company's product portfolio demonstrates a deep understanding of the electrical distribution market, offering solutions that balance cost-efficiency with cutting-edge technology. Below, we examine three flagship product lines that have gained strong recognition among global clients.

The SCB series represents Delong Electric's standard for high-performance dry-type transformers, utilizing epoxy resin casting for the windings to achieve exceptional mechanical and electrical strength. The core is constructed from high-permeability silicon steel, which significantly reduces no-load losses and improves overall energy efficiency. Copper foil windings are employed to enhance moisture resistance and thermal conductivity, making these units suitable for humid environments without the risk of partial discharge. One of the standout features of the SCB series is its high overload capacity, allowing the transformer to handle short-term peak loads without compromising insulation life. Low noise levels, typically below 45 decibels, make this series ideal for noise-sensitive locations such as libraries, hospitals, and commercial buildings. Delong Electric also ensures that each unit undergoes rigorous testing for dielectric strength and thermal performance, complying with IEC 60076 11 and other international benchmarks. For engineers seeking a reliable dry-type transformer that can operate in demanding conditions, the SCB series offers a proven balance of durability and efficiency.

For applications where energy savings are the highest priority, the SCBH15 series employs amorphous alloy core material to achieve dramatic reductions in no-load losses compared to conventional silicon steel cores. Amorphous alloy has a non-crystalline atomic structure that makes magnetic domain wall movement easier, resulting in losses that are up to 70 percent lower than those of standard grain-oriented silicon steel. This translates directly into lower electricity bills over the transformer's lifetime, making the SCBH15 series an excellent choice for utilities and industrial facilities with continuous operation. The design fully complies with IEC 60076 11, ensuring that the transformer meets global safety and performance standards. Delong Electric combines the amorphous core with epoxy resin-encapsulated windings to maintain the same fire-resistant and moisture-proof characteristics found in the SCB series. The reduced core losses also contribute to lower operating temperatures, which extends insulation life and reduces cooling requirements. For facility managers who are evaluating different types of transformer for green building certifications, this series provides a clear path toward meeting energy-efficiency targets. The SCBH15 series represents how dry transformer technology can evolve to address both economic and environmental pressures simultaneously.

Certain industrial and outdoor installations demand protection levels beyond standard indoor dry-type transformers, and Delong Electric addresses this need with customizable encapsulated designs that achieve Ingress Protection ratings up to IP65. These units feature fully sealed enclosures that prevent the ingress of dust, water jets, and corrosive substances, making them suitable for chemical plants, food processing facilities, and coastal power stations. The encapsulation process uses VPI transformer technology, where windings are impregnated with varnish under vacuum pressure to eliminate voids and enhance thermal transfer. Customers can specify custom voltage ratios, power ratings, and connection configurations through Delong Electric's flexible manufacturing process, which is detailed on theCustomized Service page. The ability to tailor the transformer to exact site conditions reduces installation complexity and improves long-term reliability. Delong Electric's engineering team works closely with clients to ensure that the final product meets all local codes and operational requirements. For projects involving extreme temperatures, high humidity, or exposure to chemicals, these customized encapsulated transformers deliver the ruggedness that standard off-the-shelf units cannot provide.

When selecting a dry-type transformer supplier, the credibility of the manufacturer and the depth of their quality systems are just as important as the technical specifications of the equipment. Delong Electric Co., Ltd. has built a reputation for excellence through strict adherence to international quality standards and continuous investment in production capabilities. The company holds ISO 9001 certification for quality management and CE marking for products sold in European markets, providing assurance that every transformer leaves the factory with consistent build quality. Research and development efforts focus on advanced cooling technologies, such as optimized duct designs and high-thermal-conductivity encapsulants, which extend the operational lifespan of the dry-type transformer. Customer support is another pillar of Delong Electric's competitive edge, with services ranging from pre-sales technical consultation to after-sales installation guidance and extended warranty options. The company can be contacted for detailed quotations and engineering support through the contact information on theHome page. Fast delivery times, supported by a well-organized supply chain and substantial production capacity, ensure that projects stay on schedule even when transformers are required on short notice. Delong Electric's long history in the transformer industry, dating back to 2001 as described on the About Us page, demonstrates stability and accumulated expertise that newer manufacturers cannot easily replicate. For buyers who prioritize reliability, regulatory compliance, and responsive service, Delong Electric offers a partnership that extends beyond simply supplying equipment.

The environmental benefits of dry-type transformers extend beyond the elimination of oil leaks, touching every stage of the product lifecycle from manufacturing to end-of-life disposal. Because these units contain no liquid insulating medium, there is zero risk of soil or water contamination during operation or in the event of a failure. The materials used in Delong Electric's dry-type transformers, including copper, silicon steel, and epoxy resin, are largely recyclable, reducing the volume of waste sent to landfills. The energy efficiency improvements offered by the SCBH15 series, with its amorphous alloy core, directly reduce carbon dioxide emissions associated with electricity generation, making them a valuable component of corporate sustainability strategies. Delong Electric designs its transformers to achieve low stray losses and high power density, which further minimizes the environmental footprint per kilovolt-ampere of capacity. For organizations working toward LEED certification, BREEAM compliance, or other green building standards, specifying a dry-type transformer from a responsible manufacturer contributes positively to the overall score. The shift toward electrification and renewable energy integration makes the efficiency of distribution transformers a critical factor in national carbon reduction goals. By choosing Delong Electric's products, businesses not only comply with environmental regulations but also demonstrate a commitment to sustainable procurement practices. The availability of custom designs allows clients to optimize transformer sizing for actual load profiles, avoiding the waste associated with oversized equipment. In an era where corporate environmental responsibility is under increasing scrutiny, the dry-type transformer represents a tangible step toward greener operations.

The versatility of Delong Electric's dry-type transformers allows them to serve a broad spectrum of applications, each with unique performance requirements. In commercial settings such as shopping malls, office towers, and hotels, the fireproof and low-noise characteristics of these transformers enable installation close to occupied spaces without special fire suppression systems. Industrial applications, including manufacturing plants, chemical processing facilities, and renewable energy installations like solar farms and wind turbine step-up stations, benefit from the high overload capacity and moisture resistance of the SCB and customized series. Infrastructure projects such as subways, airports, and water treatment plants demand reliable power distribution that can withstand vibration, dust, and temperature fluctuations, and Delong Electric's encapsulated models excel in these conditions. The dry transformer is particularly favored in data centers, where cooling efficiency and fire safety are paramount, and any liquid near sensitive electronics poses an unacceptable risk. Hospitals and healthcare facilities require uninterrupted power with minimal downtime, and the low maintenance needs of dry-type transformers support this reliability. Delong Electric's broad product range, showcased on theProductpage, allows specifiers to choose the exact configuration that matches their load profile and environmental constraints. Whether the requirement is for a standard 1 MVA unit or a custom 5 MVA encapsulated design, the company's engineering team can deliver a solution. The growing investment in smart grid infrastructure and distributed energy resources further expands the addressable market for these transformers. By integrating real-time monitoring options, Delong Electric helps facility managers track winding temperatures, load levels, and insulation condition, enabling predictive maintenance that prevents unplanned outages. In every sector, the combination of safety, efficiency, and customization makes Delong Electric's dry-type transformers a strategic choice for modern power distribution systems.

Dry-type transformers have become the preferred choice for a wide range of applications where safety, environmental responsibility, and operational efficiency cannot be compromised. Delong Electric Co., Ltd. offers a complete portfolio spanning epoxy resin cast types, amorphous alloy ultra-efficient units, and fully customizable encapsulated designs for the most demanding environments. The company's commitment to quality through ISO 9001 and CE certifications, combined with continuous investment in cooling technology and customer-centric service, provides a compelling value proposition for engineers and procurement professionals. By choosing a dry-type transformer from Delong Electric, businesses gain a reliable, fireproof, low-maintenance solution that reduces total cost of ownership over its service life. The environmental advantages of oil-free operation, recyclable materials, and energy-efficient core designs align with global sustainability goals and regulatory trends. For your next power distribution project, consider the long-term benefits of partnering with a manufacturer that combines technical depth with responsive support. Visit theHome page or explore the Product page to learn more about how Delong Electric can meet your specific transformer requirements.

A dry-type transformer is an electrical device that transfers energy between circuits using electromagnetic induction, with air as the cooling medium instead of insulating oil. It works by having primary and secondary windings wrapped around a laminated core, and the heat generated during operation is dissipated through natural air convection or forced air cooling. Because there is no oil, these transformers are fireproof, require less maintenance, and can be installed indoors without special fire protection systems.

Dry-type transformers offer several advantages over oil-filled units, including elimination of fire and explosion risks due to the absence of flammable oil, lower maintenance requirements since there is no need for oil sampling or filtration, and reduced environmental liability from potential oil leaks. They also typically operate with lower noise levels and can be placed closer to occupied spaces, making them ideal for hospitals, data centers, and commercial buildings. Additionally, they comply with strict fire codes and environmental regulations more easily than liquid-filled alternatives.

A VPI (Vacuum Pressure Impregnated) transformer uses a process where the windings are impregnated with varnish under vacuum and pressure to fill voids and enhance insulation, while a cast resin transformer uses epoxy resin poured into molds under vacuum to fully encapsulate the windings. Cast resin transformers generally offer higher mechanical strength and better moisture resistance, making them suitable for humid environments. VPI transformers are often more economical and can be repaired more easily in the field, while cast resin units are more robust against harsh conditions.

Yes, all Delong Electric dry-type transformers are designed and tested to meet the requirements of IEC 60076 11, which is the international standard specifically covering dry-type power transformers. This standard specifies requirements for temperature rise limits, dielectric tests, cooling classifications, and mechanical strength. Compliance ensures that Delong Electric's transformers are accepted in global markets and deliver reliable performance under specified operating conditions.

With proper installation and regular maintenance, Delong Electric dry-type transformers typically have an operational lifespan of 25 to 30 years. The actual service life depends on factors such as load profile, ambient temperature, humidity levels, and the quality of preventive maintenance. The use of high-permeability silicon steel, copper foil windings, and epoxy resin encapsulation contributes to long insulation life and resistance to thermal aging.

Yes, Delong Electric offers a comprehensive customized service that allows clients to specify voltage ratings, power capacities, impedance values, enclosure protection levels, and mechanical dimensions. The company's engineering team collaborates with customers to design transformers that meet unique site conditions, including harsh environments requiring IP65 protection. You can discuss your requirements through the Customized Service page.

Delong Electric's dry-type transformer range includes the SCB Series epoxy resin cast transformers for general industrial and commercial use, the SCBH15 Series amorphous alloy transformers for ultra-high energy efficiency, and customizable encapsulated transformers with IP protection up to IP65 for harsh environments. Each series is available in multiple power ratings and voltage classes to suit different distribution needs. The company also offers dry-type transformers for renewable energy applications such as solar and wind power integration.

The amorphous alloy core used in the SCBH15 series has a non-crystalline atomic structure that makes it easier for magnetic domains to align and reverse direction compared to conventional grain-oriented silicon steel. This results in drastically lower hysteresis losses, reducing no-load losses by up to 70 percent. Lower core losses mean less energy is wasted as heat when the transformer is energized but not under load, leading to significant electricity savings over the equipment's lifetime.

Dry-type transformers require significantly less maintenance than oil-filled units because there is no oil to test, filter, or replace. Routine maintenance typically includes periodic cleaning of the core and windings to remove dust buildup, inspection of ventilation openings for blockages, checking electrical connections for tightness, and monitoring insulation resistance with a megohmmeter. Thermal imaging can be used to detect hot spots, and winding temperature indicators should be checked regularly. Delong Electric provides detailed maintenance guidelines with each unit.

You can purchase Delong Electric dry-type transformers by contacting the company directly through the information provided on the Home page or the Product page. The sales team can provide quotations, technical data sheets, and lead-time information based on your specific requirements. Distribution partners in various regions also stock standard models for faster delivery.