The SCB14 series epoxy resin cast dry-type transformer is a high-performance dry-type transformer characterized by superior electrical strength, mechanical durability, and heat resistance. It is an excellent choice for urban power grid transformation projects. Manufactured using advanced production and testing equipment in accordance with stringent technological standards, this Three Phase Dry Transformer offers high reliability and a long service life.Depending on the application environment, it can be equipped with various levels of protective shell or without a shell. This makes it suitable for a wide range of environments including high-rise buildings, commercial centers, hospitals,airports, subways, tunnels, densely populated residential areas,as well as special environments such as oil refineries, chemical plants, nuclear power plants, and nuclear submarines.
Three Phase Dry Transformer Basic information
Type: Dry Type Transformer
Phase: Three
Service Voltage:6KV-11kV
Rated Capacity: 30KVA-2500kVA
Vector group:Yyn0, Dyn11
Cooling type: ANAF
Core material: CRGO
Winding material: Copper/aluminum
Purpose:Three-phase dry transformers are intended for transforming of electric energy in networks of power systems and in energy consumer networks.
Three Phase Dry Transformer Overview:
The SCB14 series epoxy resin cast dry-type transformer is a high-performance dry-type transformer characterized by superior electrical strength, mechanical durability, and heat resistance. It is an excellent choice for urban power grid transformation projects. Manufactured using advanced production and testing equipment in accordance with stringent technological standards, this Three Phase Dry Transformer offers high reliability and a long service life.Depending on the application environment, it can be equipped with various levels of protective shell or without a shell. This makes it suitable for a wide range of environments including high-rise buildings, commercial centers, hospitals,airports, subways, tunnels, densely populated residential areas,as well as special environments such as oil refineries, chemical plants, nuclear power plants, and nuclear submarines.
Dry Type Epoxy Resin Cast Power Transformer Features:
High Voltage Winding
The high voltage winding is vacuum-cast with epoxy resin containing fillers, significantly reducing discharge volume and enhancing the electrical strength of the coil. The inner and outer walls of the winding are reinforced with glass fiber mesh cloth, improving the impact toughness of the coil and its resistance to sudden short circuits. This ensures that the coil will not dry out or crack over time.
Low Voltage Winding
The low voltage winding features a foil structure that resolves issues related to radial spiral angles during wire winding.ensuring more balanced ampere-turns. Radial cooling air ducts are incorporated into the coil design to improve heat dissipation. The winding solid layer is made from DMD epoxy resin prepreg cloth, forming a robust dry solid structure through overall dry solid molding.
Iron Core
The core is constructed from high-quality cold-rolled silicon steel sheets with a 45° full oblique joint structure. The core column is bound with F-grade weft less adhesive tape, and the core surface is coated with epoxy resin, effectively reducing no-load loss, no-load current, and core noise. Clamping parts and fasteners undergo unique surface treatments to enhance the appearance quality of the product.
Three Phase Dry Transformer Advantage:
Low Loss: Compared to SCB1l products, the no-load loss ofSCB14 is reduced by over 15%, and load loss is decreased by more than 10%. This results in significant energy savings.making the operation both economical and durable.
Low Noise: The noise intensity of SCB14 is more than 10-15dBlower than the current standard JB/T10088-1999 "6-220KV Transformer Sound Level".
Low Partial Discharge: SCB14 exhibits very low partial discharge, controlled below 5pC. Both high and low voltage electromagnetic coils are cast under vacuum and pressure, resulting in a compact dry solid structure that is resistant, explosion-proof, and environmentally friendly.
Self-extinguishing Properties: Coil materials, including glass fiber and other insulating layers, possess self-extinguishing characteristics, preventing arcs caused by short circuit faults. Epoxy resin does not produce toxic substances even a thigh temperatures.
High Impact Toughness: The use of epoxy resin with fillers minimizes thermal expansion differences within the casting body, reduces curing shrinkage rates and thermal stress, and increases the hardness of the dry solid. The internal and external epoxy resin coating layer of the high and low voltage coils, contains prefabricated component lifting materials,creating a high-density structure similar to concrete. This enhances impact toughness, allowing the transformer to withstand sudden short circuit fault without damage.
Dry Type Vacuum Cast Resin Transformer Standard Fittings:
Terminal Connectors
Cast resin coils
Epoxy Resin Capacitive Insulator
Special Termination Arrangement
Cable Box/Bus Duct
Cooling Fan
Rollers (Uni-Directional /Bi-Directional) Protection with Temperature Scanner
Scanner Off Circuit Tap Changer
Q1. What does "Efficiency Level 2" mean for this transformer?
A: Efficiency Level 2 represents a high-efficiency tier (meeting standards like GB 20052-2020 Level 2 or high-tier international Eco-design requirements). It offers significantly lower no-load and load losses compared to standard Level 3 units, providing an excellent Return on Investment (ROI) through reduced electricity bills and lower carbon emissions.
Q2. What are the benefits of a "Dry-Type" transformer for indoor use?
A: Dry-type transformers use cast resin for insulation instead of oil, making them non-flammable, self-extinguishing, and moisture-proof. They eliminate the risk of oil leaks and fire, which is essential for high-rise buildings, underground subways, and hospitals where safety is the top priority.
Q3. How does "Non-exciting Voltage Regulation" work?
A: Non-exciting voltage regulation (also known as Off-Circuit Tap Changing) allows you to manually adjust the voltage ratio (typically $\pm 2 \times 2.5\%$) via the tap links when the transformer is de-energized. This ensures your output voltage stays within the required range even if your local grid supply fluctuates.
Q4. What is the significance of the "Double-winding" design?
A: The Double-winding (Two-winding) configuration provides complete galvanic isolation between the primary and secondary sides. This design effectively suppresses electrical noise and harmonics, ensuring a clean and stable power supply for sensitive industrial automation and IT equipment.
Q5. What insulation class is used in your transformers?
A: We use high-performance Class F (155°C) or Class H (180°C) insulation systems. Our vacuum-cast epoxy resin ensures high dielectric strength and mechanical robustness, allowing the transformer to handle overload conditions and thermal stresses reliably.
Q6. How is heat dissipation managed in your dry-type units?
A: We utilize a dual-cooling system:
AN (Air Natural): Optimized cooling channels between the HV and LV windings.
AF (Air Forced): High-efficiency cross-flow fans that can increase the continuous load capacity by up to 40% during peak demand or emergency situations.
Q7. Does the transformer include intelligent temperature monitoring?
A: Yes. Every unit is equipped with an Intelligent Temperature Controller connected to PT100 sensors embedded in the windings. It provides real-time digital displays and programmable "Alarm" and "Trip" contacts to protect the transformer from overheating.
Q8. Is the cast resin resistant to moisture and dust?
A: Absolutely. Our Vacuum Cast Resin process creates a solid, void-free encapsulation. This makes the windings hermetically sealed against moisture, salt spray, and industrial dust, ensuring a maintenance-free life and reliable "cold starts" even in humid climates.
Q9. What testing standards do your transformers comply with?
A: All units produced at our Shanxi factory are manufactured and tested in accordance with IEC 60076-11. We conduct rigorous routine tests, including:
Partial Discharge (PD) Test (ensuring $<10$ pC for long-term insulation life).
Voltage ratio and vector group verification.
Insulation resistance and dielectric strength tests.
Q10. What documentation is provided for international projects?
A: For every export order, we provide a complete English technical package, including:
Factory Acceptance Test (FAT) Report.
Efficiency Level 2 Certification.
Foundation Drawings and Connection Schematics.
Installation and Operation Manual.
