Transformers
Dry Type Transformer
Ensure maximum safety and environmental compliance with our advanced Dry Type Transformers. Ideal for sensitive indoor applications, commercial buildings, hospitals, and industrial facilities where fire safety and minimal environmental impact are critical. Our Dry Type Transformers use air or solid dielectric material as the cooling medium, completely eliminating the need for liquid coolants. They offer superior fire resistance, excellent overload capability, and no risk of oil leaks, ensuring a cleaner, safer, and quieter operation. Available in various kVA ratings and configurations, they provide reliable voltage regulation and minimal maintenance for modern, responsible power distribution.
13.8kV 1600kVA Cast Resin Dry Type Transformer
Introducing the robust 13.8kV 1600kVA Cast Resin Dry Type Transformer, a high-capacity, oil-free power solution engineered for safe, reliable indoor medium-voltage distribution in industrial and utility applications. This three-phase cast resin transformer utilizes premium low-loss grain-oriented silicon steel cores and high-conductivity copper (or optional aluminum) windings fully encapsulated in epoxy resin under vacuum pressure, delivering exceptional energy efficiency (often exceeding 98-99% per DOE/IEEE standards), significantly reduced no-load and load losses, and superior partial discharge performance (<10pC). Compliant with IEC 60076-11, IEEE/ANSI, and DOE efficiency requirements, this transformer steps down 13.8kV primary (with ±2×2.5% off-circuit taps standard) to common secondary voltages like 0.4kV, 0.48kV, or 0.66kV (Dyn11 vector group typical), making it ideal for sustainable, high-power indoor substations and facilities.
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer, a premium oil-free solution engineered for safe, reliable medium-voltage power distribution in indoor environments. This three-phase cast resin transformer features fully vacuum-impregnated epoxy resin windings with high-conductivity copper conductors and premium low-loss grain-oriented silicon steel cores, achieving superior energy efficiency (typically 98.5%+), significantly reduced no-load and load losses, and excellent partial discharge performance (<10pC). The advanced cast resin encapsulation provides outstanding moisture resistance, self-extinguishing fire safety (F1 class), robust short-circuit withstand capability, and completely maintenance-free operation. Natural air (AN) cooling with optional forced air (AF) upgrades supports high overload capacity, while optimized core clamping, vibration-dampening mounts, and noise-reduction design deliver low acoustic levels suitable for urban or sensitive installations.
33kV Cast Resin Dry Type Transformer 1000kVA–5000kVA Three Phase
The 33kV Cast Resin Dry Type Transformer 1000kVA–5000kVA Three Phase is a high-capacity, oil-free power solution engineered for demanding indoor medium- and high-voltage distribution networks. This robust three-phase cast resin transformer utilizes premium low-loss grain-oriented silicon steel cores and high-conductivity copper windings (aluminum optional) fully encapsulated in high-grade epoxy resin under vacuum pressure, delivering exceptional energy efficiency (typically 98.5–99.5%), significantly reduced no-load and load losses, and superior partial discharge performance (<10pC). Fully compliant with IEC 60076-11, IEEE/ANSI, and relevant energy efficiency standards, this transformer steps down 33kV primary (with ±2×2.5% to ±10% off-circuit taps standard) to secondary voltages such as 0.4kV, 0.69kV, 6.6kV, or 11kV (Dyn11 vector group typical).
35kV High Voltage Dry Type Transformer
The 35kV High Voltage Dry Type Transformer is a robust, three-phase cast-resin (epoxy-encapsulated) power transformer engineered for safe, reliable high-voltage to medium-voltage or medium-voltage to low-voltage transformation in demanding indoor and protected outdoor substation applications. With full high-conductivity copper windings and advanced vacuum-cast resin insulation, it eliminates oil fire risks, environmental hazards, and routine maintenance while providing superior dielectric strength, thermal endurance, excellent resistance to moisture/dust/pollution, and very low noise levels in fire-regulated. Fully compliant with IEC 60076-11, IEC 60076-1/2/3/5/20, EN 50588-1 (eco-design), IEEE C57.12.01, IEEE C57.12.91, UL 1561 (optional), and aligned with DOE efficiency guidelines (exceeding 2016 levels and prepared for 2029 loss-reduction amendments), this series achieves excellent energy efficiency (typically 99.25–99.55% at full load), ultra-low no-load and load losses, strong overload capability (up to 150% short-term), low sound levels (<65 dB standard; <60 dB low-noise execution), and a design life exceeding 40 years with virtually zero maintenance.
Step Down Dry Type Transformer
The Step Down Dry Type Transformer is a safe, efficient, oil-free electrical device designed to reduce (step down) higher incoming voltages to lower levels suitable for end-use equipment in indoor power distribution systems. This three-phase or single-phase transformer uses air (natural or forced) for cooling instead of insulating liquids, with windings typically encapsulated in epoxy resin (cast resin) or vacuum pressure impregnated for superior insulation. It features premium low-loss grain-oriented silicon steel cores and high-conductivity copper (or aluminum) windings, delivering excellent energy efficiency (often 98%+ per DOE/IEC standards), minimal no-load/load losses, low partial discharge (<10pC), and robust short-circuit withstand. Compliant with IEC 60076-11, IEEE/ANSI, and DOE efficiency requirements, step-down dry type transformers commonly handle primary voltages from 480V to 35kV+ stepping down to 208Y/120V, 400V, 0.4kV, or custom secondaries, making them ideal for modern, sustainable indoor applications.
Three Phase Cast Resin Dry Type Transformer
The Three Phase Cast Resin Dry Type Transformer is a safe, high-efficiency indoor power transformer series designed for reliable medium-voltage to low-voltage step-down in commercial, institutional, industrial, data center, hospital, school, high-rise, and renewable energy applications. With advanced epoxy cast-resin encapsulation and full high-conductivity copper windings, it completely eliminates oil fire risks, environmental hazards, and routine maintenance while offering excellent dielectric strength, thermal performance, resistance to moisture/dust/chemicals, and very low noise levels — making it the ideal choice for fire-sensitive, noise-restricted, space-constrained, or high-reliability indoor installations. Fully compliant with IEC 60076-11, IEC 60076-1/2/3/5/20, EN 50588-1 (eco-design), IEEE C57.12.01, IEEE C57.12.91, UL 1561 (optional listing), and DOE 2016 efficiency standards.
Step Up Dry Type Transformer Copper Winding High Overload Capacity
The Step Up Dry Type Transformer Copper Winding High Overload Capacity is a robust, oil-free power solution designed to increase (step up) voltage from lower primary levels to higher secondary outputs for efficient power transmission in indoor applications. This three-phase cast resin dry type transformer features premium high-conductivity copper windings fully encapsulated in epoxy resin under vacuum pressure, paired with low-loss grain-oriented silicon steel cores to achieve superior energy efficiency (typically 98%+), minimal no-load and load losses, and excellent partial discharge performance (<10pC). Compliant with IEC 60076-11, IEEE/ANSI, and relevant efficiency standards, this transformer commonly steps up voltages such as 0.4kV/480V primary to 6.6kV, 11kV, 13.8kV, 22kV, or 35kV secondary (Dyn11 or custom vector group), with capacities from 100kVA to several MVA, making it ideal for renewable energy systems, generator step-up, industrial processes, and utility indoor substations prioritizing safety, sustainability, and overload resilience.In-Depth Analysis
Dry type transformers are built to deliver high efficiency, reliable performance, and advanced safety, helping businesses reduce energy costs while ensuring stable power supply. With future-ready adaptability for renewable energy and smart grid applications.
Comparative Analysis of Efficiency and Loss
Compared to the industry average, transformers exhibit lower losses and higher efficiency across the entire load range.
Load Efficiency Comparison(%)
No-load Loss Comparison(W)
High-efficiency Core Design
High magnetic permeability and low loss silicon steel sheets are used and processed by special process to reduce hysteresis loss and eddy current loss and improve conversion efficiency.
Improved Magnetic Permeability
+30%
Reduced Iron Loss
-35%
Multiple Protection Systems
IP65 protection grade design combines multiple protection measures such as anti-corrosion, anti-UV, anti-condensation and anti-small animal intrusion.
Waterproof Performance
IP65
Anti-Corrosion Ability
15 years+
Ultra-low Noise Technology
A special shock-absorbing structure, low-noise fans, and optimized heat dissipation design ensure operating noise is far below industry standards.
Noise Reduction
-15dB
Suitability for Residential Areas
Excellent
Intelligent Cooling System
The heat dissipation system with adaptive temperature control automatically adjusts the heat dissipation efficiency according to the load and ambient temperature to reduce energy consumption.
Heat Dissipation Efficiency
+40%
Temperature Stability
±2℃
Safety Wiring System
Insulated protective cover and anti-misoperation design ensure personnel safety during installation and maintenance and reduce accident risks
Insulation Grade
Class H
Safety Protection
IP2X
Intelligent Monitoring
An optional remote monitoring system is available to monitor operating status, temperature, load and other parameters in real time, and supports fault warning and remote diagnosis.
Data Collection Frequency
one times a minute
Fault Warning Accuracy
96%
Environmental Adaptability Analysis
Dry type transformers have been rigorously tested and can operate stably under various harsh environmental conditions.
Temperature Range
-40℃ ~ +55℃
Can work normally in extreme high and low temperature environments
Humidity Adaptation
0 ~ 100% RH
Including condensation environment, no frost requirement
Seismic Resistance Level
IEC 60068-2-57
Suitable for earthquake-prone areas
Altitude
≤3000m
More than special design
Why Choose Us
Discover why our dry-type transformers are trusted worldwide for efficiency, safety, and reliability.
Dry Type Transformers Manufacturer
NPC Electric is a trusted dry-type transformer manufacturer committed to delivering high-quality, energy-efficient, and safe transformer solutions. Our product range includes cast resin dry-type transformers, three-phase dry-type transformers, and dry-type distribution transformers, widely used in commercial buildings, hospitals, data centers, and industrial plants.
Unlike oil-filled models, dry-type transformers use air or epoxy resin for cooling and insulation, eliminating the risk of leakage or fire, making them ideal for indoor transformer installations. Each low-voltage and medium-voltage dry-type transformer is engineered for superior thermal performance, low noise, and minimal maintenance. As a global power transformer manufacturer, NPC Electric ensures all units meet IEC, IEEE, and ANSI standards, providing durable and environmentally friendly power solutions for modern electrical networks.
Dry Type Transformers Types
There are several dry-type transformer types, each designed to meet specific performance, safety, and installation requirements. The most common are the cast resin dry type transformer (CRT) and the vacuum pressure impregnated (VPI) dry type transformer. The cast resin type features epoxy resin encapsulation that protects windings from moisture, dust, and corrosion—making it ideal for harsh or humid environments. The VPI dry-type transformer, on the other hand, uses varnish impregnation for excellent mechanical strength, low noise, and efficient cooling performance.
NPC Electric also manufactures three-phase dry-type transformers and dry-type distribution transformers for low voltage and medium voltage networks. Each dry-type power transformer is engineered for high efficiency, fire safety, and long service life, ensuring reliable power delivery across industrial, commercial, and infrastructure applications worldwide.
High Efficiency & Reliable Performance
NPC Electric’s dry-type transformers are engineered to deliver high efficiency and reliable performance across various power distribution systems. Using premium-grade silicon steel cores and advanced vacuum casting technology, our cast resin dry-type transformers and three-phase dry-type transformers minimize no-load and load losses, improving overall energy utilization. Each dry-type distribution transformer ensures excellent voltage regulation, low noise, and stable performance even under fluctuating loads or harsh environments.
Designed for both indoor and outdoor use, these energy-efficient transformers reduce operational costs while maintaining superior thermal stability. All units undergo strict testing under IEC and IEEE standards, guaranteeing dependable long-term operation. Whether for commercial, industrial, or renewable energy applications, NPC Electric’s low-loss dry-type transformers provide exceptional reliability and consistent power delivery with minimal maintenance.
Versatile Applications & Global Standards
NPC Electric’s dry-type transformers are designed for versatility, safety, and global compatibility. Our dry-type distribution transformers, including three-phase and cast-resin dry-type transformers, are widely used in commercial complexes, industrial facilities, hospitals, data centers, transportation systems, and renewable energy projects. These low-voltage and medium-voltage transformers offer superior performance in environments where oil-filled units are not suitable, such as indoor spaces or fire-sensitive areas.
Each transformer is manufactured under strict IEC, IEEE, and ANSI standards, ensuring consistent quality and international compliance. As a trusted global transformer manufacturer, NPC Electric provides custom-engineered dry-type transformers tailored to regional grid requirements, voltage ratings, and installation conditions. Our solutions guarantee reliability, energy efficiency, and long-term safety in diverse applications worldwide.
Product Show
Explore the detailed design and practical application scenarios of dry-type transformers
75kVA Dry Type Transformer
75kva transformer font view
Dry Type Transformer Warning
transformer danger warnings
Dry Type Transformer Installation
workers assemble dry-type transformers
Dry Type Transformer Back
transformer back design
Dry Type Transformer Base Design
transformer ground base fixed design
Dry Type Transformer Top Design
transformer top design and base package
Dry Type Transformer Winding
transformer winding accessories material
220kV Dry Type Transformer
220kV transformer production completed
Testing and Certification
Tested with precision and certified to meet international standards as
well as strict industry requirements.
Bare Cable Test Report
SGS Inspection Report
Certificate of Acceptance
ISO Quality Certificate
ISO Environmental Certificate
ISO Occupational Certificate
UL Laboratory Certificate
UL Product Certificate
Project Cases
Dry-type transformers have been successfully applied in many projects and have been highly praised by customers.
Venezuela Residential Area
CompletedProvide stable and reliable power conversion solutions for the residential area to meet diverse production needs.
Country：Venezuela
Model：75kVA Dry Type Transformer x 20
Rwanda Data Center
CompletedEnsure the power safety of surrounding residents and meet daily work needs
Country：Rwanda
Model：167kVA Dry Type Transformer x 15
Panama Factory
CompletedNPC transformers provide safe, efficient, and reliable power distribution in Panama.
Country：Panama
Model：150kVA Dry Type Transformer x 30
Related Articles
Understand the product's characteristics, structure, and applications.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
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What is a dry type transformer?
A dry type transformer is an electrical transformer that uses air or resin for cooling instead of insulating oil. The most common designs are cast resin dry type transformers (CRT) and vacuum pressure impregnated (VPI) types. These transformers are ideal for indoor installations where safety and environmental protection are essential.
Dry type distribution transformers are widely used in commercial buildings, hospitals, tunnels, and renewable energy systems because they offer high efficiency, low noise, and minimal maintenance. -
Why would you use a dry transformer?
Dry type transformers are preferred in environments where fire safety, reliability, and low maintenance are critical. Since they don’t use oil, there’s no risk of leakage or fire, making them ideal for indoor transformer installations. They’re also environmentally friendly and resistant to moisture and contaminants. Industries such as data centers, offices, and hospitals choose cast resin dry type transformers for their excellent insulation performance, compact design, and long service life. -
What is the difference between dry type and oil type transformer?
The key difference lies in the cooling and insulation method. Dry type transformers use air or epoxy resin for cooling, while oil type transformers (also known as oil immersed transformers) use insulating oil to dissipate heat. Dry type transformers are safer and cleaner, ideal for indoor use, while oil immersed transformers are typically used outdoors for higher-capacity networks. Both provide efficient power distribution, but the dry type transformer is preferred in fire-sensitive or environmentally restricted areas. -
Can dry type transformers be used outside?
Yes, dry type transformers can be used outdoors if they are properly enclosed and protected from weather conditions. NPC Electric offers outdoor dry type transformers with IP-rated enclosures, corrosion-resistant coatings, and enhanced ventilation systems. These transformers maintain excellent performance in harsh or humid climates. Whether used as a dry type distribution transformer or three phase dry type transformer, they provide reliable operation with minimal maintenance for outdoor electrical networks. -
What are the requirements for a dry type transformer?
The main requirements for a dry type transformer include proper ventilation, insulation class, protection rating, and installation clearance. Dry type transformers should comply with international standards such as IEC 60076, IEEE C57.12, and ANSI for safety and efficiency. They must be installed in well-ventilated areas with adequate cooling and protection from dust or moisture. NPC Electric’s cast resin dry type transformers are manufactured to meet these requirements, ensuring long-term reliability and consistent power performance in demanding applications.
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