Dry-Type Power Transformer – Fire-Resistant, Low-Maintenance Power Conversion Solution for Global Safe Power Systems

The dry-type power transformer is a high-safety, eco-friendly power conversion device, manufactured in strict accordance with IEC 60076 and GB 1094 international and national standards. Different from traditional oil-immersed transformers, it uses air or inert gas as the cooling medium and epoxy resin or Nomex insulating paper as the core insulation material, featuring fire resistance, explosion proof, no oil leakage and low maintenance. Widely applied in indoor power distribution rooms, high-rise buildings, data centers, hospitals, mines, subway systems and other scenarios with high safety and environmental requirements worldwide, it is favored by power companies, engineering contractors and industrial enterprises in Africa, Southeast Asia, Central Asia and Latin America for its reliable performance, compact structure and strong environmental adaptability.

1. Core Technical Parameters & Customization Options

Our dry-type power transformer covers a full range of capacity and voltage configurations, with flexible customization services to meet the diverse power supply needs of different regions, scenarios and load types, ensuring perfect matching with the user’s power system and on-site installation conditions.

Full-Range Technical Specifications

Rated capacity: Ranges from 30 kVA to 31,500 kVA, covering small-scale terminal power distribution, medium-sized industrial load supply and large-scale indoor power grid transmission scenarios. High-voltage side rated voltage: 6 kV, 10 kV, 35 kV (optional 66 kV for medium-voltage scenarios), fully compatible with the high-voltage power grid standards of most countries and regions.

Low-voltage side rated voltage: 0.4 kV, 10 kV, which can be flexibly configured according to the user’s low-voltage power distribution requirements. Rated frequency: 50Hz/60Hz, adapting to the power grid frequency requirements of different regions, with strong cross-border compatibility. Common connection groups: Dyn11, Yyn0, Yd11, which can effectively suppress third harmonic interference, improve power quality, and meet the power supply needs of sensitive electrical equipment such as precision instruments and medical devices.

Impedance voltage: 4%–10%, which can be optimized according to the load type to effectively limit short-circuit current and protect the transformer and connected power distribution equipment from damage. Cooling methods: Air natural cooling (AN) as standard, suitable for medium and small capacity and light load scenarios; air forced cooling (AF) optional for large capacity and high-load continuous operation scenarios, which can increase the transformer’s overload capacity by 30%–50%.

Insulation grade: Mainly F grade (155℃), with optional H grade (180℃) for high-temperature working environments such as mines and steel plants, effectively extending the service life of the transformer under harsh conditions. The overall efficiency of the transformer reaches over 98%, and the no-load loss and load loss are optimized according to the latest energy efficiency standards, meeting the global green energy-saving and environmental protection requirements. The fire resistance grade reaches UL94 V-0, and the oxygen index is ≥28%, which can resist open fire burning and avoid fire spreading.

Comprehensive Customization Services

To adapt to the diverse needs of global users, we provide one-stop customization services. According to the local power grid standards and on-site installation conditions, we can customize the voltage level, capacity, connection group and impedance voltage of the transformer. For scenarios with high dust, humidity or corrosive gases (such as mines, chemical plants), we offer enhanced protection level customization (IP20/IP23/IP33/IP54), with dust-proof and anti-corrosion treatment to improve environmental adaptability.

For scenarios requiring frequent voltage adjustment (such as areas with unstable grid voltage), an on-load tap changer (OLTC) can be configured to adjust the output voltage without power failure, ensuring continuous power supply. For noise-sensitive scenarios such as hospitals and residential buildings, we can customize low-noise transformers with noise levels controlled within ≤45dB (measured at 1m distance). Additionally, we can customize the transformer’s installation method (floor-mounted, wall-mounted, cabinet-type), dimensions and color to fit the user’s on-site installation space and aesthetic requirements.

We also provide two core insulation material options: epoxy resin vacuum casting (SCB series) and Nomex insulating paper (SGB series). The epoxy resin casting type has excellent insulation performance and moisture resistance, suitable for humid and dusty environments; the Nomex type has good thermal stability and recyclability, suitable for high-temperature and environmentally sensitive scenarios.

2. Advanced Structure & Core Competitive Advantages

The dry-type power transformer adopts a scientific structural design and high-quality raw materials, integrating high safety, reliability, energy saving and environmental protection, with outstanding performance in all aspects, making it stand out among similar products.

Superior Fire Safety & Explosion Proof Performance

The transformer abandons the traditional insulating oil, using epoxy resin vacuum casting or Nomex insulating paper as the insulation material, with no flammable and explosive medium inside. The epoxy resin casting structure is dense and non-porous, with excellent fire resistance and arc resistance, and can operate normally for 1 hour at 180℃ high temperature. Even in case of extreme faults such as winding short circuit, it will not produce open fire, and will not release toxic and harmful gases, effectively avoiding fire and explosion accidents.

This safety performance makes it especially suitable for indoor installation scenarios such as high-rise buildings, data centers, hospitals and subway stations, where fire safety requirements are strict, and it can meet the fire protection standards of various countries and regions without additional fire protection facilities, reducing the user’s construction and operation costs.

High-Efficiency Energy-Saving & Low-Loss Design

The transformer core is made of high-permeability cold-rolled silicon steel sheets with an optimized step-lap or roll-core structure, with shear burrs controlled below 0.02mm. The core manufacturing process adopts a no-paint design, which minimizes no-load loss and no-load current, reducing energy consumption during light load or no-load operation. The winding adopts high-quality oxygen-free copper wire, with a tight and concentric winding structure and advanced vacuum impregnation process.

The insulation structure is optimized, and prefabricated insulation materials and reasonable winding spacing are adopted, which effectively reduces load loss and improves the overall energy efficiency of the transformer. The low-loss design not only significantly reduces the user’s electricity consumption and operational costs, but also reduces carbon emissions, in line with the global green energy development trend and national “double carbon” strategy requirements. Even under 30% overload conditions, the transformer can operate stably for 2 hours, adapting to the fluctuation of loads in industrial and commercial scenarios.

Low Maintenance & Long Service Life

The dry-type structure eliminates the need for regular oil sampling, oil replacement and oil leakage treatment required for oil-immersed transformers, realizing maintenance-free operation in the short term. The epoxy resin casting winding has good aging resistance and corrosion resistance, and is not affected by moisture, dust and corrosive gases, reducing the frequency of failures and maintenance.

The transformer is equipped with a temperature monitoring system (including temperature controller and thermal sensor) as standard, which can monitor the temperature of the winding and core in real time, and issue an alarm in time when the temperature exceeds the limit, avoiding insulation aging caused by overheating. Strict implementation of international manufacturing standards, use of high-quality raw materials and advanced production processes (fully automatic robot winding, vacuum casting), each transformer undergoes strict testing before leaving the factory, with a product qualification rate of 100% and a service life of more than 30 years.