Junray Electrical Dry-type Transformer is a cast-resin, oil-free power transformer specifically designed for indoor distribution applications where fire safety, maintenance-free operation, and low noise are critical requirements. Rated capacity ranges from 100 kVA to 3150 kVA, with high voltage 10 kV and low voltage 0.4 kV. Featuring epoxy resin-encapsulated windings, Class F insulation, and an intelligent temperature control system, it provides exceptional fire resistance, moisture protection, and short-circuit withstand capability. With approximately 10% lower losses than standard oil-immersed transformers, it delivers significant energy savings over long-term operation. Suitable for shopping malls, hospitals, office buildings, data centers, and underground distribution rooms where space is limited and fire safety regulations are stringent.
Fire Safety: Designed for indoor use, this unit contains no insulating oil and boasts exceptional fire resistance. It can be installed directly within indoor power distribution rooms, eliminating the need to construct a separate, dedicated fire-rated transformer room. This makes it perfectly suited for indoor environments with stringent fire safety requirements—such as shopping malls, office buildings, and hospitals—where the risk of oil leakage and subsequent fire is a primary concern.
Maintenance-Free: Unlike oil-immersed transformers that require periodic oil changes and quality inspections, this unit is completely maintenance-free. This significantly reduces long-term maintenance costs, making it an ideal choice for locations where routine maintenance access is difficult or inconvenient.
Low Loss: Energy-Efficient Operation: Utilizing a high-quality silicon steel core, this transformer exhibits very low power loss—approximately 10% lower than that of standard oil-immersed transformers. Over the long term, this translates into substantial electricity savings and demonstrates significant energy-efficiency benefits.
High Reliability:Low Failure Rate: Featuring windings encapsulated in epoxy resin, the unit offers superior insulation properties as well as excellent resistance to moisture and contaminants. This ensures highly stable operation and an exceptionally low failure rate—approximately 30% lower than that of oil-immersed transformers—making it the perfect solution for indoor applications.
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Rated Capacity |
100KVA~3150KVA |
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Rated Voltage |
High Voltage: 10 kV; Low Voltage: 0.4 kV |
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Impedance Voltage |
4~6% |
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Insulation Heat Resistance Class |
F |
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Transformer Winding Material |
Copper/Aluminum Customizable |
1. Epoxy Resin-Cast Windings: The windings are encapsulated in epoxy resin, offering superior insulation, resistance to moisture and contaminants, and enhanced fire safety.
2. Air Cooling System: Features an air-cooling mechanism that eliminates the need for insulating oil, requires no maintenance, and ensures fire safety.
3. Intelligent Temperature Control System: An intelligent system that automatically monitors winding temperatures; Dry-type Transformer triggers an alarm in the event of overheating, thereby ensuring operational safety.
4. Standardized Installation: Designed for standardized installation, allowing for direct placement within indoor power distribution rooms for maximum convenience.
Shopping Mall Power Distribution: Indoor power distribution for shopping malls requires stringent fire safety standards.
Hospital Power Distribution: Indoor power distribution for hospitals requires stringent fire safety standards.
Office Building Power Distribution: Indoor power distribution for office buildings requires stringent fire safety standards.
Factory Power Distribution: Indoor power distribution for factories is maintenance-free.
This project involves the construction of a new underground power distribution room for a large-scale urban complex comprising a shopping mall, high-rise office towers, an underground parking garage, a cinema, and supporting dining facilities. Classified as a high-occupancy area with "Level 1" power load requirements, the distribution room is located on the building's underground level. The initial plan to use traditional oil-immersed transformers presented issues such as potential oil leakage, fire hazards, a large footprint, complex operation and maintenance, and excessive noise, failing to meet fire safety and environmental regulations for underground structures. Instead, the project utilizes SCB13 epoxy resin-cast dry-type transformers as the primary distribution units. These transformers supply power for daily operations—including general power, lighting, central air conditioning, and fire safety systems—across the entire commercial complex, ensuring safe, uninterrupted operation around the clock.
Underground enclosed spaces have extremely strict fire safety requirements; oil-immersed transformers pose risks of oil fires and leakage-related pollution, failing to meet civil air defense and fire safety acceptance standards.
High-density areas demand low noise and environmental compliance; oil-immersed transformers generate significant noise and odors, easily leading to complaints.
Summer air conditioning loads are concentrated and volatile, creating high risks of temperature rise; the system requires robust overload capacity and precise temperature monitoring.
Underground space is limited, necessitating compact transformer units that allow for direct indoor floor-mounting and require no routine on-site inspections or maintenance.
High overall power supply reliability is required; prolonged outages for maintenance are unacceptable, and the system must feature safety protections and short-circuit resistance.
Model: SCB13-1600kVA 10kV/0.4kV cast-resin dry-type transformer
Quantity: 4 units; operated separately with mutual backup capability
Structure: Fully cast epoxy resin insulation; equipped with temperature monitoring, axial fan cooling, and an IP30 protective enclosure
Key Parameters: Rated voltage 10±2×2.5%/0.4kV; impedance voltage 6%; Class F insulation; integrated temperature monitoring, over-temperature alarm, and over-temperature trip protection
Installation Location: Dedicated underground distribution room (Level B1); direct indoor floor-mounting; no fire-resistant oil pit required
Ancillary Features: Intelligent temperature controller, fan cooling system, and vibration/noise reduction measures to minimize operating noise
Fire and explosion-proof, suitable for underground environments: Oil-free design with flame-retardant epoxy resin insulation eliminates fire and leakage risks; complies with fire safety regulations and is ideal for long-term operation in enclosed underground spaces.
Low noise and low loss: SCB13 series. High-efficiency, energy-saving core structure with integrated noise reduction ensures significantly lower operating noise, causing no disturbance to shopping mall operations or office environments.
Maintenance-free and easy to operate: Eliminates the need for periodic oil filtration, replacement, or sampling; requires only routine visual and temperature inspections, drastically reducing O&M costs.
High short-circuit resistance and stable operation: Features an integrated cast structure with high mechanical strength capable of withstanding system short-circuit shocks; intelligent temperature control monitors winding temperatures in real-time to prevent overheating failures.
Compact footprint and flexible layout: Requires no oil pits or complex fire suppression systems, saving civil engineering space in underground distribution rooms.
No oil leaks, fires, or insulation failures occurred throughout the year; successfully passed fire safety and power distribution acceptance inspections, ensuring safe and compliant operation of the underground distribution room.
Noise control met standards; the shopping mall environment remained undisturbed by transformer noise, and there were no complaints from residents.
Stable operation during peak summer air-conditioning loads; the temperature control system dissipated heat effectively without over-temperature tripping, and voltage quality remained stable, ensuring the reliable operation of central air conditioning, elevators, and fire safety equipment.
Overall losses were significantly reduced compared to older transformers, resulting in substantial energy savings during long-term operation.
Convenient troubleshooting and maintenance: Temperature and winding status can be quickly checked, and maintenance cycles are short, ensuring uninterrupted power supply for the complex's operations.
Epoxy resin cast-dry-type transformers are the preferred choice for indoor power distribution in high-traffic areas such as underground structures, commercial complexes, hospitals, schools, data centers, and high-rise residential buildings. With features including oil-free fire safety, low noise, energy efficiency, a compact footprint, and high reliability, they effectively resolve fire safety risks and O&M challenges associated with indoor power distribution, while meeting urban green building and fire safety code requirements.
Junray Electrical strictly adheres to national standards in the production of its dry-type transformers. Each unit undergoes rigorous voltage withstand, loss, and temperature control testing to ensure stable and safe operation. We offer customization options for both capacity and voltage, allowing us to tailor a dedicated dry-type transformer specifically to your indoor power distribution requirements—ensuring a perfect fit for your needs.
Junray Electrical is a certified manufacturer with a comprehensive quality assurance system. Our key certifications include:
ISO 9001 – International quality management system certification, ensuring consistent product quality and continuous improvement.
CE – Conformity with European health, safety, and environmental protection standards, enabling our products to enter the EU market.
CCC – China Compulsory Certification, mandatory for electrical products sold in the Chinese market.
CQC – China Quality Certification, demonstrating compliance with national standards for electrical safety and performance.
CNAS – China National Accreditation Service for conformity assessment, validating our in-house testing and calibration capabilities.
All Dry-type Transformers are manufactured and tested in compliance with the applicable standards of these certifications, ensuring reliable performance, consistent quality, and smooth project acceptance.
A: Dry-type transformers use epoxy resin-encapsulated windings with air cooling, containing no insulating oil. They are fire-safe, maintenance-free, and suitable for indoor installation. Oil-immersed transformers use insulating oil for cooling and require periodic oil changes, making them more suitable for outdoor applications. Dry-type transformers are the preferred choice for indoor environments with strict fire safety requirements such as shopping malls, hospitals, and office buildings.
A: Yes. Since the unit contains no insulating oil and features flame-retardant epoxy resin insulation, it poses no fire risk from oil leakage. It can be installed directly in indoor distribution rooms without the need for a dedicated fire-rated transformer room, saving valuable building space.
A: The transformer is equipped with an intelligent temperature control system that monitors winding temperatures in real time. In the event of overheating, the system triggers an alarm and can automatically trip the unit to prevent damage, ensuring safe and reliable operation.
A: Yes. Unlike oil-immersed transformers that require periodic oil quality testing, oil filtration, and oil changes, dry-type transformers require no such maintenance. Only routine visual inspections and temperature monitoring are needed, significantly reducing long-term operation and maintenance costs.
A: Yes. We support customization of rated capacity (100 kVA to 3150 kVA), high voltage (10 kV), low voltage (0.4 kV), impedance voltage (4-6%), winding material (copper or aluminum), and enclosure protection rating (IP20, IP30, IP40) to match your specific indoor distribution requirements.
Address
No. 318, Weidian Road, Economic Development Zone, Yueqing City, Zhejiang Province, China
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