The modern data center relies on an uninterrupted, clean, and safe power supply to maintain critical operations around the clock. As computing densities increase with the rise of artificial intelligence, hyperscale facilities, and high-performance workloads, the choice of power distribution equipment becomes more consequential than ever. Among the most vital components in this ecosystem is the transformer, and the dry-type transformer has emerged as the preferred solution for data center environments where safety, reliability, and efficiency are non-negotiable. Unlike traditional oil-filled units, a dry type transformer uses advanced insulation materials such as epoxy resin or vacuum pressure impregnation, eliminating the risks of oil leakage and fire hazards. Delong Electric Co., Ltd., a globally recognized manufacturer with over two decades of experience, has positioned itself at the forefront of this technology by offering high-performance dry-type transformers specifically engineered for the demanding requirements of data centers. This article explores the unique advantages, technical specifications, and real-world applications of these transformers while highlighting why Delong Electric has become a trusted partner for power infrastructure projects worldwide. Whether you are upgrading an existing facility or designing a greenfield hyperscale campus, understanding the role of a robust dry-type transformer is essential for achieving long-term operational excellence.

The company behind these innovations, Delong Electric Co., Ltd., has built a reputation for quality, customization, and responsive global support since its founding. With a manufacturing facility that spans thousands of square meters and a team of R&D engineers dedicated to continuous improvement, Delong Electric produces a wide range of transformers including oil-immersed, dry-type, amorphous alloy, and photovoltaic models. Their dry-type transformer portfolio, however, stands out as a flagship product line for the data center sector due to its compliance with stringent international standards such as IEC 60076 11 and IEEE C57.12.01. By combining state-of-the-art epoxy resin casting technology with rigorous quality control processes, the company ensures that each unit delivers consistent performance under the most challenging electrical loads. This introduction sets the stage for a deeper examination of why Delong Electric's dry-type transformers represent a superior investment for data center operators who prioritize safety, efficiency, and total cost of ownership over the long term.

One of the most compelling reasons to select a dry-type transformer from Delong Electric is its inherent fire safety, a critical consideration in data centers where electrical equipment operates at high densities and fire suppression can be extremely costly and disruptive. Because these transformers use no oil or other flammable liquids, they eliminate the risk of oil leaks that could lead to catastrophic fires or environmental contamination, making them suitable for indoor installations within server rooms, electrical rooms, and adjacent to sensitive IT equipment. Additionally, the dry-type construction means there is no need for oil containment systems, fire suppression trenches, or special ventilation requirements, which simplifies facility design and reduces construction costs. From a maintenance perspective, these units require minimal intervention compared to oil-filled alternatives, as they do not require periodic oil sampling, filtration, or dielectric testing. This low-maintenance characteristic translates directly into lower operational expenditure over the transformer's service life, which can easily exceed thirty years with proper care. Delong Electric also subjects each transformer to comprehensive factory acceptance tests that include partial discharge measurement, induced overvoltage tests, and temperature rise verification, ensuring that every unit shipped meets the highest benchmarks of reliability and durability.

Compliance with international standards is another pillar of Delong Electric's value proposition, as their dry-type transformers are designed and tested in accordance with IEC 60076 11, the global standard for dry-type power transformers, as well as IEEE C57.12.01 for general requirements. This means that regardless of where your data center is located, the equipment will meet local regulatory expectations and facilitate smooth permitting and inspection processes. Furthermore, the company's vacuum pressure impregnation (VPI) process, combined with epoxy resin casting, provides superior insulation against moisture, dust, and chemical contaminants that are common in industrial environments. The VPI transformer manufacturing method ensures that every void within the winding is filled with resin, resulting in a homogeneous insulation system that resists cracking and partial discharge over decades of service. For data center operators who demand the highest levels of availability, these features collectively reduce the probability of unplanned downtime caused by transformer failure, which can cost millions of dollars per hour in lost revenue and reputational damage. By choosing a Delong Electric dry-type transformer, you are investing in a product that prioritizes safety, longevity, and global compliance from the very first day of operation.

Delong Electric's dry-type transformers are built around advanced epoxy-resin cast insulation and are available in both Class F (155°C) and Class H (180°C) temperature ratings to accommodate a range of ambient conditions and load profiles. This casting method encapsulates the low- and high-voltage windings in a solid, void-free resin system that provides excellent dielectric strength, thermal conductivity, and mechanical robustness against short-circuit forces. The result is a transformer that can withstand repeated overload events without degradation—a critical capability in data center environments, where power demands can spike unpredictably due to server reboots, cooling system startups, or failover events. In addition to thermal resilience, these transformers are engineered for high overload capacity, often rated for 150% of nominal current for short durations, giving operators a safety margin that prevents nuisance tripping and enhances system reliability. Harmonic mitigation is another area where Delong Electric excels, offering designs with K-factor ratings up to 20 to handle the nonlinear loads generated by modern switch-mode power supplies, UPS inverters, and variable-frequency drives. A high K-factor rating ensures that the transformer can operate within its temperature limits even when supplying heavily distorted current waveforms, which is increasingly common in data centers with high-density server deployments.

Energy efficiency is a defining characteristic of the latest generation of dry-type transformers from Delong Electric, particularly those that incorporate amorphous alloy cores. These cores, made from a metallic glass material with extremely low hysteresis and eddy current losses, can reduce no-load losses by up to 70% compared to conventional grain-oriented silicon steel cores. For a Tier 2 data center operating thousands of transformers across multiple electrical rooms, this efficiency gain translates into substantial energy savings and a lower total cost of ownership over the equipment's life. The amorphous alloy dry-type transformer is particularly well-suited for facilities that pursue green building certifications such as LEED or strive to meet corporate sustainability targets related to carbon footprint reduction. Beyond the core material, Delong Electric optimizes the entire magnetic circuit through advanced finite element analysis, minimizing stray losses and reducing audible noise levels to as low as 50 dBA for typical ratings. This noise reduction is a tangible benefit in data center environments where sound levels must be managed to protect worker comfort and comply with occupational health regulations. With a comprehensive range of voltage classes from 1 kV to 36 kV and power ratings from 100 kVA to 15,000 kVA, the company offers a dry-type transformer solution for virtually any data center topology, from edge facilities to massive hyperscale campuses.

The electrification of artificial intelligence workloads has placed unprecedented demands on data center power infrastructure, with modern AI clusters requiring 100 to 200 kW per rack compared to traditional enterprise deployments that typically draw 5 to 15 kW per rack. This dramatic increase in power density requires transformers that can handle high continuous currents, significant harmonics, and rapid load fluctuations without compromising voltage regulation or thermal performance. Delong Electric's dry-type transformers are engineered to meet these exacting requirements, providing stable power delivery to GPU servers, networking gear, and storage arrays that form the backbone of AI training and inference platforms. In hyperscale facilities that span hundreds of thousands of square meters, transformers are deployed at multiple levels of the electrical distribution hierarchy, including utility entrance transformers, distribution transformers feeding row-level PDUs, and dedicated units for mechanical cooling systems. The inherent fire safety and low maintenance profile of dry-type transformers make them particularly attractive for these large-scale deployments, where any single point of failure can cascade into a multi-hour outage affecting thousands of customers. Furthermore, the integration of these transformers with uninterruptible power supply (UPS) systems and power distribution units (PDUs) is seamless, thanks to flexible connection options that include busway plugs, cable boxes, and custom termination chambers designed to match the specific switchgear layout of each facility.

Beyond the core data hall, dry-type transformers from Delong Electric are also deployed in supporting infrastructure such as electrical rooms, generator buildings, and chiller plants where they step down medium voltage power to utilization levels for motors, pumps, and lighting. The ability to operate in harsh environmental conditions, including high humidity, temperature extremes, and dusty environments, makes them ideal for locations where oil-filled transformers would require extensive protective enclosures or remote siting. For colocation providers that must guarantee uptime to multiple tenants, the reliability and serviceability of dry-type transformers directly impact their ability to meet service level agreements and retain customers. Additionally, the compact footprint of these transformers, combined with their low weight relative to oil-filled equivalents, allows for flexible placement within existing buildings without the need for structural reinforcements or specialized fire-rated rooms. Delong Electric also offers custom voltage ratios, tap configurations, and impedance values to match the specific requirements of each data center design, ensuring that the transformer integrates optimally with upstream switchgear and downstream distribution equipment. Whether the application involves a greenfield hyperscale project, a retrofit of an existing enterprise data center, or an edge facility in a remote location, the dry-type transformer solution from Delong Electric delivers the performance, safety, and efficiency that modern digital infrastructure demands.

Proper installation is critical to maximizing the performance and lifespan of any dry-type transformer, and Delong Electric provides expert installation support that includes pre-installation site surveys, foundation design recommendations, and guidance on clearances for ventilation and maintenance access. For data centers located in seismic zones, the company offers reinforced mounting brackets, flexible conduit connections, and additional bracing to ensure the transformer remains operational after an earthquake event, a consideration that is increasingly important as more facilities are built in regions with moderate to high seismic activity. The installation team also coordinates with the facility's electrical contractors to verify that all connections are torqued to specifications, that the grounding system meets local code requirements, and that the transformer is properly aligned with incoming and outgoing cable trays or busways. Once the transformer is energized, a comprehensive commissioning test is performed that includes ratio verification, polarity checks, and a full-load heat run to confirm that temperatures remain within design limits under simulated operating conditions. This thorough approach minimizes the risk of early-life failures and provides a documented baseline for future condition monitoring activities. Delong Electric's commitment to quality extends well beyond the initial sale, with a global network of service partners who can respond to on-site issues within 24 to 48 hours in most major markets.

Preventive maintenance is the cornerstone of transformer reliability, and Delong Electric recommends a structured program that includes quarterly thermographic inspections to identify hot spots caused by loose connections, unbalanced loading, or deteriorating insulation. Annual insulation resistance testing using a megohmmeter provides valuable trend data on the health of the winding insulation, while partial discharge measurements can detect incipient faults before they escalate into catastrophic failures. For transformers equipped with amorphous alloy cores, the core loss characteristics remain stable over time, but periodic checks of the core ground strap and magnetic circuit integrity are still advisable to ensure optimal efficiency. Delong Electric also offers extended warranty programs and service contracts that cover routine inspections, emergency repairs, and access to genuine replacement parts such as cooling fans, temperature sensors, and control panels. By following the recommended maintenance schedule and leveraging the company's technical support resources, data center operators can achieve a transformer service life of thirty years or more with minimal unplanned downtime. This long-term reliability is a direct reflection of the quality built into every dry-type transformer that leaves the Delong Electric factory, supported by a team that understands the critical role these units play in keeping the digital world running.

With over twenty years of manufacturing experience in the power transformer industry, Delong Electric has accumulated deep expertise across all major transformer types, including oil-immersed, dry-type, and amorphous alloy designs, giving customers access to a broad knowledge base that few competitors can match. This experience is backed by a fully integrated factory that performs every stage of production in-house, from core cutting and winding to resin casting, final assembly, and testing, ensuring consistent quality control and traceability for every component. The company's engineering team works closely with clients to develop custom solutions that address unique voltage requirements, space constraints, cooling configurations, and harmonic profiles, rather than forcing a standard design into a suboptimal application. Fast delivery is another hallmark of the Delong Electric partnership, with typical lead times for standard dry-type transformer ratings ranging from four to eight weeks, significantly shorter than the industry average of twelve to sixteen weeks for comparable custom equipment. For data center projects that operate on tight construction schedules, this accelerated delivery can make the difference between meeting a critical opening date and facing costly delays. Additionally, the company maintains a stock of common replacement units and spare parts to support emergency situations, further reducing the risk of extended downtime for its customers.

Global customer support is a core pillar of Delong Electric's business model, with a sales and service network that spans North America, Europe, Southeast Asia, the Middle East, and Africa, providing multilingual technical support and on-site assistance as needed. The company holds internationally recognized certifications including ISO 9001 for quality management, ISO 14001 for environmental management, and a range of type tests accredited by independent laboratories such as KEMA and CESI. These certifications give data center operators and engineering procurement construction (EPC) firms the confidence that Delong Electric's dry-type transformers will meet the rigorous requirements of their projects, whether they are located in Dubai, Singapore, or Silicon Valley. The company also publishes detailed technical documentation, including dimensional drawings, wiring diagrams, loss data, and sound level reports, to facilitate seamless integration into the electrical design of any facility. By choosing Delong Electric as a partner, data center developers gain access to a manufacturer that treats each project as a collaborative effort, providing responsive communication, transparent pricing, and a genuine commitment to customer success. This partnership approach, combined with best-in-class product quality, makes Delong Electric a compelling choice for any organization seeking reliable, efficient, and safe dry-type transformers for data center applications.

In an era where data center uptime directly impacts business revenue, customer trust, and competitive advantage, the selection of power infrastructure components such as the dry-type transformer must be approached with diligence and foresight. Delong Electric's dry-type transformers offer a compelling combination of fire safety, low maintenance, high efficiency, and global compliance that addresses the most pressing challenges faced by modern data center operators. From the advanced epoxy resin casting insulation that provides exceptional dielectric strength and thermal performance, to the amorphous alloy cores that dramatically reduce no-load losses, every aspect of these transformers is engineered to deliver long-term value. The company's extensive experience across all types of transformer designs, coupled with its commitment to customization, fast delivery, and responsive global support, makes it a trusted partner for projects of any scale and complexity. Whether you are planning a hyperscale campus, an enterprise data center, or an AI cluster requiring 100 kW per rack, Delong Electric has the expertise and product portfolio to meet your power distribution needs. We invite you to visit theHome page to learn more about the company's broad range of offerings, explore the Product page for detailed specifications, or contact their team directly for a personalized consultation and quote. Discover why leading data center developers around the world trust Delong Electric to deliver reliable power for the digital future.

A dry-type transformer uses solid insulation materials such as epoxy resin or vacuum pressure impregnated (VPI) compounds to insulate its windings, rather than liquid oil. This design eliminates the risk of oil leakage, reduces fire hazards, and allows for indoor installation without special containment systems. Dry-type transformers also require less maintenance because there is no oil to sample, filter, or test, making them an excellent choice for data centers where cleanliness and safety are paramount.

IEC 60076 11 is the international standard that specifies performance, testing, and safety requirements for dry-type power transformers. Compliance with this standard ensures that the transformer has been rigorously tested for parameters such as temperature rise, dielectric strength, partial discharge, and short-circuit withstand capability. For data center operators, choosing a transformer certified to IEC 60076 11 provides confidence that the equipment will perform reliably under demanding conditions and meet local regulatory expectations.

A VPI transformer (vacuum pressure impregnated transformer) is a type of dry-type transformer where the windings are impregnated with resin under vacuum and pressure to eliminate voids and ensure complete insulation coverage. This process results in a homogeneous insulation system that resists moisture, dust, and mechanical stress, while also improving thermal conductivity and partial discharge performance. VPI transformers are particularly well-suited for harsh environments and applications that demand high reliability over long service lives.

Delong Electric offers a comprehensive range of transformer types including oil-immersed distribution transformers, dry-type cast resin transformers, VPI transformers, amorphous alloy core transformers, and photovoltaic step-up transformers. Each type is engineered for specific applications, with dry-type designs focusing on indoor safety and low maintenance, while oil-filled models are often used for outdoor utility applications. The company also provides custom solutions tailored to unique voltage, power, and environmental requirements.

Because a dry-type transformer contains no flammable liquid insulation, it eliminates the risk of oil fires and the associated toxic smoke that could damage sensitive IT equipment and endanger personnel. This allows the transformer to be installed directly inside electrical rooms or even within the data hall without requiring fire-rated enclosures or remote siting. In the event of an electrical fault, the solid insulation materials used in dry-type transformers are self-extinguishing and do not contribute to the spread of flames.

With proper installation and adherence to the recommended preventive maintenance schedule, a Delong Electric dry-type transformer can operate reliably for 30 years or more. The epoxy resin casting system provides excellent resistance to thermal cycling, moisture ingress, and mechanical vibration, all of which contribute to long-term durability. Regular inspections such as thermography and insulation resistance testing help identify potential issues early, further extending the operational life of the equipment.

The K-factor rating indicates a transformer's ability to handle harmonic currents without exceeding its temperature limits. Data centers are filled with non-linear loads such as switch-mode power supplies and UPS inverters that generate significant harmonics, which can cause overheating in standard transformers. Delong Electric offers dry-type transformers with K-factor ratings up to 20, meaning they are specifically designed to operate safely under the distorted current waveforms common in modern computing environments.

Yes, Delong Electric specializes in custom transformer solutions and works closely with clients to develop designs that match exact voltage ratios, tap ranges, impedance values, and mechanical dimensions. Their engineering team can accommodate non-standard primary or secondary voltages, special enclosure types, custom cable entry configurations, and integrated cooling systems. This flexibility ensures that the transformer integrates seamlessly with the facility's electrical distribution architecture.

An amorphous alloy core is made from a metallic glass material that has significantly lower hysteresis and eddy current losses compared to conventional grain-oriented silicon steel. This can reduce no-load losses by up to 70%, meaning the transformer wastes less energy simply by being energized, even when no load is connected. For data center operators, this translates into lower electricity bills, reduced cooling requirements, and a smaller carbon footprint over the transformer's entire service life.

Yes, Delong Electric has a global network of service partners and field engineers who can provide on-site installation supervision, commissioning support, and preventive maintenance services in most major markets worldwide. They also offer remote technical assistance via phone and video conferencing, along with access to detailed service manuals and spare parts through their regional distribution centers. This global support infrastructure ensures that data center operators can maintain their transformers to the highest standards regardless of geographic location.