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Delong Dry-Type Transformers: Why Hospitals and Airports Prefer Them
Created on 07.28
Delong Dry-Type Transformers: Why Hospitals and Airports Prefer Them
In critical infrastructure environments such as hospitals and airports, uninterrupted power distribution is not a luxury but a necessity. A single power failure can disrupt life-saving medical equipment in an operating room or ground thousands of passengers in a major hub. That is why facility managers and electrical engineers increasingly turn to the dry-type transformer as the backbone of their electrical systems. Unlike traditional oil-filled units, these transformers offer superior safety, lower environmental risk, and exceptional reliability in indoor settings. Delong Electric Co., Ltd., a leading Chinese manufacturer with decades of experience, has positioned itself at the forefront of this technology by delivering a comprehensive lineup of high-performance dry-type solutions. By combining rigorous engineering with intelligent monitoring, Delong ensures that emergency rooms, control towers, and everything in between receive stable, clean power at all times. This article explores why the dry type transformer has become the preferred choice for mission-critical facilities and how Delong’s innovations are setting new benchmarks for quality and efficiency.
Key Features of Delong Dry-Type Transformers
Safety and Environmental Friendliness
Safety is the primary concern when selecting power equipment for occupied buildings, and the dry-type transformer excels in this regard because it contains no oil or flammable liquids. Delong’s units are inherently fireproof, meaning they eliminate the risk of oil leaks that could ignite or contaminate surrounding areas. This non-polluting design makes them ideal for indoor installation in hospitals, where sterile environments are paramount, and in airports, where thousands of passengers move through terminals daily. Furthermore, the absence of liquid cooling simplifies compliance with strict building codes and environmental regulations. By choosing a dry type transformer, facility owners avoid the need for expensive containment pits and fire suppression systems that oil-filled units require. Delong also manufactures its enclosures using flame-retardant materials, adding an extra layer of protection for people and property.
Reliability and Durability
Reliability is non-negotiable for facilities that operate around the clock, and Delong dry-type transformers are engineered to withstand the most demanding conditions. The core is constructed from high-quality cold-rolled grain-oriented silicon steel, which delivers high mechanical strength and excellent magnetic properties. This robust construction gives the transformer a strong short-circuit withstand capability, ensuring that it remains operational even when the grid experiences faults or surges. Additionally, the vacuum-impregnated windings are reinforced with glass fiber to prevent cracking under thermal and mechanical stress. Delong subjects every unit to rigorous factory testing, including impulse voltage and partial discharge tests, to guarantee long-term durability. As a result, these transformers often exceed their expected service life of 25–30 years, providing a dependable return on investment for hospital administrators and airport operators alike.
Energy Efficiency and Low Maintenance
Energy costs represent a significant portion of a facility’s operating budget, and Delong dry-type transformers are designed to minimize losses at every load level. The use of amorphous alloy cores in select models further reduces no-load losses, making them among the most efficient types of transformer available today. Lower losses translate directly into reduced electricity bills and lower heat generation, which in turn lessens the burden on HVAC systems. These transformers also operate with remarkably low noise levels, which is a critical advantage for hospitals where quiet environments aid patient recovery. Because there is no oil to filter, test, or replace, maintenance is reduced to simple visual inspections and occasional cleaning of ventilation grilles. This maintenance-free operation frees up facility staff to focus on other priorities, reducing total ownership costs over the lifespan of the equipment.
Compact Design and Easy Installation
Space is at a premium in most healthcare and aviation facilities, and Delong has responded with a compact transformer design that minimizes the equipment footprint. The dry-type transformer requires no fireproof vault or oil containment area, so it can be installed directly in electrical rooms, on rooftops, or even inside mechanical mezzanines. This small footprint translates into significant savings in construction and real estate costs, especially in urban hospitals where square footage is expensive. Delong also offers a range of enclosure types, from IP20 for indoor safety to IP23 for outdoor protection, giving installers the flexibility to adapt to any environment. The integrated lifting lugs and clearly marked terminals simplify rigging and connection, reducing installation time and labor expense. With a Delong dry type transformer, project managers can complete power system installations faster and more cost-effectively than with oil-filled alternatives.
Intelligent Temperature Control System
Modern power systems demand real-time visibility into equipment health, and Delong equips its dry-type transformers with a sophisticated intelligent temperature control system. Embedded Pt100 sensors monitor winding temperatures continuously, triggering automatic fan activation when thresholds are exceeded. If temperatures continue to rise, the controller issues an over-temperature alarm and, if necessary, initiates a trip command to protect downstream equipment. This proactive thermal management prevents insulation degradation and extends the transformer’s operational life. The system also supports remote monitoring via standard communication protocols, allowing facility managers to track performance from a central control room. For airports and hospitals that rely on building management systems, this connectivity simplifies integration and provides peace of mind around the clock.
Cooling Methods and Overload Capability
Understanding cooling methods is essential when selecting a dry-type transformer for applications that may experience fluctuating loads. Under normal conditions, Delong transformers operate using natural air cooling (AN), which relies on convection to dissipate heat through the core and windings. This passive method is silent, requires no moving parts, and is sufficient for continuous rated operation in most indoor environments. However, when temporary overloads occur—such as during a hospital emergency or a flight schedule surge—the transformer can switch to forced air cooling (AF) by activating internal fans. This forced air cooling increases the transformer’s capacity by up to 50%, providing a valuable safety margin without requiring a larger unit. Delong engineers carefully design the cooling ducts and fan arrays to ensure uniform airflow, preventing hot spots even during prolonged overload events. It is important to note that while the AF mode is effective for short-term capacity increases, the transformer must return to AN operation once the overload subsides to maintain long-term reliability. This dual-cooling approach gives facility operators the flexibility to handle peak demands without oversizing their equipment.
Structural Types and Core Components
The internal construction of a dry-type transformer directly influences its efficiency, noise, and lifespan, and Delong employs high-quality materials to maximize performance at every level. The core is built from cold-rolled grain-oriented silicon steel, which is precisely stacked and annealed to reduce hysteresis and eddy-current losses while keeping audible noise to a minimum. This core design is a critical differentiator among types of transformer because lower core losses mean less heat generation and higher overall efficiency. The windings are cast under vacuum using epoxy resin, a process that eliminates voids and ensures complete encapsulation of the conductors. For additional mechanical integrity, glass fiber reinforcement is added to the winding structure, preventing cracks that could arise from thermal cycling or short-circuit forces. Delong also offers multiple enclosure types to suit different installation conditions: the IP20 enclosure provides basic protection against fingers and solid objects for indoor use, while the IP23 enclosure adds protection against spraying water for sheltered outdoor locations. Each structural choice is engineered to comply with international standards such as iec 60076 11, which governs power transformers, ensuring that Delong products meet the highest safety and performance benchmarks globally.
Applications and Environmental Suitability
The versatility of Delong dry-type transformers makes them suitable for a wide range of demanding applications beyond hospitals and airports. High-rise buildings, docks, CNC machinery, data centers, and renewable energy plants all benefit from the fire-resistant, low-maintenance characteristics of this technology. The standard operating temperature range is 0°C to 40°C, with altitude compensation up to 2500 meters, which covers the vast majority of urban and industrial installations worldwide. For facilities located in dusty or humid environments, Delong recommends maintaining adequate clearance around the transformer and using filtered ventilation to keep the core and windings clean. It is equally important to avoid installing the transformer in areas with conductive dust, chemical fumes, or excessive vibration, as these conditions can accelerate insulation wear. When these environmental guidelines are followed, a Delong dry type transformer delivers consistent performance with minimal intervention. The company also offers customization services—such as special voltage ratios, tapping arrangements, and corrosion-resistant coatings—to adapt the transformer to unique site requirements, a flexibility that is detailed on theirCustomized Service page.
Comparison with Oil-Immersed Transformers
When evaluating transformer technologies, engineers often compare dry-type and oil-immersed designs across several criteria, and the dry-type transformer consistently wins in safety-critical applications. The most obvious advantage is fire resistance: a dry-type unit contains no combustible oil, so it will not propagate flames or release toxic smoke during a fault. This characteristic alone makes it the mandated choice for many building codes in hospitals, airports, and underground transit stations. Oil-immersed transformers, by contrast, require fire-resistant vaults, oil containment pits, and automatic fire suppression systems, all of which add significant capital and maintenance costs. While the initial purchase price of a dry-type transformer is typically higher than that of an oil-filled equivalent, the total cost of ownership is often lower due to reduced maintenance, longer service intervals, and elimination of oil handling expenses. Delong dry-type transformers also comply with stringent international safety standards, including iec 60076 11, which gives specifiers confidence in their performance. For facility managers who prioritize life safety and operational simplicity, the dry-type solution is the clear winner, and Delong’s reputation for quality reinforces that choice. More information about Delong’s full product range can be found on theirProduct page.
Routine Maintenance and Inspection
Although Delong dry-type transformers are designed for low maintenance, a simple periodic inspection routine can extend their service life and prevent unplanned downtime. Facility personnel should check for unusual sounds, such as buzzing or humming that is louder than normal, which may indicate loose laminations or winding movement. Vibration at the enclosure or mounting points should also be investigated promptly, as it can lead to fatigue failure of connections over time. Thermal imaging is a valuable tool for identifying hot spots on windings or bus bars before they cause insulation damage, and Delong recommends performing this scan annually. The cooling system should be kept free of dust and debris by cleaning air intake grilles and fans with a vacuum or compressed air, ensuring that the AN and AF modes remain effective. All electrical connections, including the dry type teck connector and cable terminations, should be checked for tightness and signs of oxidation or arcing. By following these simple steps, operators can maintain the transformer’s reliability and efficiency for decades, and Delong’sAbout Us page provides additional insight into the company's commitment to long-term customer support.
Conclusion
Hospitals and airports demand power systems that are safe, reliable, and efficient, and the dry-type transformer from Delong Electric Co., Ltd. delivers on all three fronts. From its fireproof construction and intelligent temperature controls to its compact footprint and low maintenance requirements, every feature is engineered to solve real-world challenges faced by facility operators. Delong’s investment in high-quality materials and adherence to international standards such as iec 60076 11 ensure that each transformer performs consistently under the most demanding conditions. Whether you are designing a new hospital wing, upgrading an airport terminal, or modernizing a data center, choosing a Delong dry type transformer is a strategic decision that reduces risk and lowers total ownership costs. The company’s long history of innovation and customer-focused service, highlighted on theirHome page, makes them a trusted partner for projects around the world. For detailed technical specifications and customization options, explore the News page to stay updated on the latest product developments. Embrace the future of safe, efficient power distribution with Delong Electric—where quality meets innovation.
Frequently Asked Questions (FAQ)
What is a dry-type transformer and how does it differ from an oil-immersed transformer?
A dry-type transformer uses air or resin for cooling instead of insulating oil, making it fireproof and environmentally friendly. Unlike oil-immersed units, it requires no oil containment or fire suppression systems, and it is ideal for indoor installations such as hospitals and airports.
Why do hospitals prefer dry-type transformers over other types of transformers?
Hospitals prioritize safety and reliability because power outages can endanger patients. The dry-type transformer is fireproof, non-polluting, and operates quietly, all of which are critical for patient care areas. Delong's models also feature intelligent temperature control to prevent overheating in sensitive environments.
Can a dry-type transformer handle overload conditions in an airport or industrial setting?
Yes, Delong dry-type transformers are designed with dual cooling modes: natural air cooling (AN) for continuous operation and forced air cooling (AF) for up to 50% overload capacity. This allows them to handle temporary peak loads without requiring a larger unit.
What standards does a Delong dry-type transformer comply with?
Delong dry-type transformers are manufactured in accordance with the international standard iec 60076 11, which covers power transformers. They also undergo rigorous testing including impulse voltage and partial discharge tests to ensure safety and performance.
How long does a dry-type transformer typically last, and what maintenance does it need?
The expected service life of a Delong dry-type transformer is 25–30 years with minimal maintenance. Routine inspections should include checking for unusual sounds, vibration, dust buildup, and tightness of connections such as the dry type teck connector.
What are the different types of transformer enclosures available from Delong?
Delong offers IP20 enclosures for basic indoor protection and IP23 enclosures for sheltered outdoor locations where resistance to water spray is needed. Custom enclosures can also be designed for special environmental conditions.
Is a dry-type transformer suitable for outdoor installation in a dock or high-rise building?
Yes, with an appropriate IP23 enclosure, a Delong dry-type transformer can be installed outdoors in docks, high-rise buildings, and other exposed locations. It is also resistant to humidity and dust when proper ventilation and clearance are maintained.
How does the cost of a dry-type transformer compare to an oil-immersed transformer over its lifetime?
Although the initial purchase price of a dry-type transformer is higher, its total cost of ownership is often lower because there is no oil to test, filter, or replace. Lower maintenance and elimination of fire suppression infrastructure also contribute to long-term savings.
Can I get a customized dry-type transformer from Delong for a specific voltage or application?
Yes, Delong offers customization services including special voltage ratios, tapping arrangements, and corrosion-resistant coatings. Visit the Customized Service page for details on how to request a tailored solution.
Where can I find news and product updates about Delong dry-type transformers?
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