Dry Type Transformer
A Cast Resin Dry Type Transformer uses epoxy resin-encapsulated windings to eliminate oil leakage, reduce fire risk, and ensure consistent electrical performance in demanding environments. It is purpose-built for projects where oil-filled transformers are restricted or costly to maintain.
The SCB13 epoxy resin dry-type transformer is extensively utilized in civil construction due to its superior energy-saving performance. The accompanying chart illustrates the no-load loss parameters for different series of transformers: SCB10(Basic Efficiency Level), SCB1l (Old Standard Efficiency Level 2),SCB12 (New Standard Efficiency Level 3), and SCB13 (Old Standard Efficiency Level 1). It is evident that both the SCB12and SCB13 series exhibit lower energy consumption and higher efficiency, making them the primary promoted models for energy conservation.
The subsequent line chart provides a more intuitive comparison, demonstrating that the SCB12 and SCB13 series achieve an average reduction of approximately 11% in no-load loss compared to the SCB11 series; relative to the SCB10 series, the no-load loss (PO) decreases by about 23%, high lighting their significant energy-saving benefits. Given the generally low load rates in modern civil buildings, these low-loss transformers offer substantial energy savings and environmental protection advantages.
Basic information
Type: Dry Type Transformer
Phase: Three
Service Voltage: 6kV-11kV
Rated Capacity: 30KVA~250OkVA
Vector group:Yyn0, Dyn11
Cooling type: ANAF
Core material: CRGO
Winding material: Copper/aluminum
Purpose:Three-phase dry type transformers are intended for transforming of electric energy in networks of power systems and in energy consumer networks.
Dry Type Epoxy Resin Cast Power Transformer Advantage:
A Cast Resin Dry Type Transformer uses epoxy resin-encapsulated windings to eliminate oil leakage, reduce fire risk, and ensure consistent electrical performance in demanding environments. It is purpose-built for projects where oil-filled transformers are restricted or costly to maintain.
The SCB13 epoxy resin dry-type transformer is extensively utilized in civil construction due to its superior energy-saving performance. The accompanying chart illustrates the no-load loss parameters for different series of transformers: SCB10(Basic Efficiency Level), SCB1l (Old Standard Efficiency Level 2),SCB12 (New Standard Efficiency Level 3), and SCB13 (Old Standard Efficiency Level 1). It is evident that both the SCB12and SCB13 series exhibit lower energy consumption and higher efficiency, making them the primary promoted models for energy conservation.
The subsequent line chart provides a more intuitive comparison, demonstrating that the SCB12 and SCB13 series achieve an average reduction of approximately 11% in no-load loss compared to the SCB11 series; relative to the SCB10 series, the no-load loss (PO) decreases by about 23%, high lighting their significant energy-saving benefits. Given the generally low load rates in modern civil buildings, these low-loss transformers offer substantial energy savings and environmental protection advantages.
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.
Dry Type Epoxy Resin Cast Power Transformer Advantage:
Low Loss: The SCB13 series exhibits over 20% lower no-load losses compared to SCB10 products, delivering excellent energy efficiency and economic operation.
Low Noise: The noise level of SCB12 transformers is significantly reduced, being at least 10-15 dB lower than the current standard JB/T10088-1999 for "6-220kV Transformer Sound Levels".
Low Partial Discharge: SCB12 transformers have minimal partial discharge, typically controlled below 5pC. Both high and low voltage windings are cast under vacuum and pressure, resulting in a compact, solid structure that is resistant to explosions and environmentally friendly.
Fire Safety: The coil insulation materials, including glass fiber, possess self-extinguishing properties, preventing arc formation during short circuit faults. Additionally, epoxy resin does not produce toxic or harmful substances even under high 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 power 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
Dry Type Vacuum Cast Resin Transformer Transport Packaging:
.Wooden box
.Wooden pallet
.Wooden frame
.We generally use wooden box packaging, which can avoid collisions, corrosion, rust, etc, and effectively protect the transformer during transportation.
1. What are the primary applications for the Epoxy Resin Cast Dry Type Transformer?
Our dry-type transformers are ideal for environments where fire safety and oil-free operation are critical. They are widely used in high-rise buildings, shopping malls, airports, subway stations, and industrial plants where traditional oil-immersed transformers pose a fire risk.
2. What does "Efficiency Level 3" mean for this transformer?
Efficiency Level 3 refers to the standard energy-efficiency tier (as defined by modern standards like GB 20052-2020). It offers a highly cost-effective balance between initial investment and operational losses, making it the most popular choice for general industrial and commercial power distribution.
3. How is "Epoxy Resin Casting" beneficial for the windings?
The high-voltage windings are vacuum-cast in epoxy resin, creating a solid, void-free insulation barrier. This makes the transformer flame-retardant, moisture-proof, and dust-proof, while providing exceptional mechanical strength to withstand short-circuit forces.
4. What is the fire-resistance rating of your dry-type transformers?
Our transformers are classified as F1 (Fire behavior), C2 (Climatic class), and E2 (Environmental class). They are self-extinguishing and produce no toxic gases or smoke in the event of an external fire, ensuring the highest level of safety for indoor installations.
5. Can this transformer operate in high-humidity or coastal environments?
Yes. Because the coils are completely sealed in resin, they are highly resistant to moisture ingress and salt spray corrosion. We recommend our IP23 enclosure for these environments to provide extra physical protection while maintaining natural airflow for cooling.
6. What temperature monitoring systems are integrated?
Every unit comes with an Intelligent Temperature Controller. We embed PT100 sensors into the low-voltage windings. The controller provides real-time digital temperature displays and includes programmable "Alarm" and "Trip" functions to protect the transformer from overheating.
7. Does the transformer require regular maintenance?
One of the biggest advantages of our epoxy cast design is that it is virtually maintenance-free. There is no oil to test or replace, and no gaskets to leak. You only need to perform occasional visual inspections and clear any dust accumulation from the ventilation paths.
8. What cooling methods are available?
We offer two standard cooling modes:
AN (Air Natural): For continuous operation at rated capacity.
AF (Air Forced): Using integrated bottom-mounted fans to increase the output capacity by up to 40% during peak loads or emergency situations.
9. What are the standard Voltage Ratios and Tap ranges?
Our standard distribution models typically handle 10kV/11kV/20kV/33kV on the primary side and 400V/415V/433V on the secondary. We provide Off-Circuit Tap Changers with a range of $\pm 2 \times 2.5\%$ to allow for fine-tuning of the output voltage based on your local grid conditions.
10. What testing standards do your transformers comply with at the Shanxi factory?
All transformers are manufactured and tested in accordance with IEC 60076-11. Before leaving our factory, every unit undergoes:
Partial Discharge (PD) Test (ensuring $<10$ pC for long-term insulation life).
Voltage Ratio and Vector Group Verification.
Insulation Resistance and Dielectric Tests.
No-load and Full-load Loss Verification.
