SCB13 Copper Winding Dry Type Power Transformer

What is it?

The SCB13 series is a three-phase, resin-cast insulated, copper-wound dry-type power transformer. In the designation, "SC" stands for cast resin (epoxy resin vacuum cast), "B" indicates foil windings, and "13" represents the performance level, meaning its loss values meet the Level 1 energy efficiency requirements of the national standard GB 20052-2020. The core conductive material is high-purity oxygen-free copper, not aluminum or copper-clad aluminum.

What does it do?

1. Voltage Conversion : Converts high voltage (10kV, 35kV) to low voltage (400V, 690V) or steps up as needed, meeting the voltage requirements of various equipment.

2. Power Distribution : As the core device of a distribution system, it safely delivers power to multiple loads such as industrial plants, commercial complexes, high-rise buildings, and wind farms.

3. Safe Power Supply : Due to its non-flammable epoxy resin solid insulation, it will not spray oil or catch fire even in case of internal faults, making it particularly suitable for indoor installations or locations with stringent fire safety requirements.

4. Quiet Operation : Operating noise is significantly lower than traditional oil-immersed transformers, making it suitable for residential areas, hospitals, office buildings, and other noise-sensitive environments.

In short, the SCB13 Copper Winding Dry Type Power Transformer is a modern power distribution core device integrating high energy efficiency, all-copper core, low noise, and flame-retardant safety.

Product Advantages

Compared to ordinary dry-type transformers, this product offers five core advantages:

All-Copper Windings, Excellent Conductivity : All high and low voltage windings are wound using oxygen-free copper rod-drawn enameled rectangular copper wire or copper foil. Copper's resistivity (approx. 0.0172 Ω·mm²/m) is much lower than aluminum's (approx. 0.0283 Ω·mm²/m). Therefore, copper windings of the same cross-section have lower resistance, less heat generation, and higher power conversion efficiency. The electricity cost saved over long-term operation far exceeds the initial investment difference.

Level 1 Energy Efficiency, Compliant with National Dual-Carbon Strategy : The SCB13 loss level is strictly designed to meet national Level 1 energy efficiency standards. No-load losses are about 10% lower than SCB12, and load losses are over 5% lower. For a 1000kVA transformer running 8,000 hours per year, this saves over 10,000 yuan annually in electricity costs, recovering the price difference compared to standard transformers within 3-5 years.

Epoxy Resin Vacuum Casting, Reliable Insulation : Windings are cast and cured with imported Huntsman (or equivalent quality) epoxy resin under vacuum, completely eliminating air bubbles. The cured insulation layer has high mechanical strength, thermal shock resistance, crack resistance, and moisture/dirt protection. Partial discharge is controlled below 5pC, far superior to national standards.

Strong Overload Capacity, Adapts to Fluctuating Loads : Under natural cooling, it can operate long-term at 10% overload; with forced air cooling (fans installed), output capacity can increase to over 120% of rated value. For seasonal load peaks (e.g., summer air conditioning use), no immediate capacity increase is needed.

Moisture-Proof and Contamination-Resistant, Strong Environmental Adaptability : The epoxy resin cast winding surface is smooth, dense, and non-hygroscopic. Even after shutdown in 100% relative humidity environments, it can start directly at full load without preheating. Particularly suitable for damp or corrosive environments such as underground distribution rooms, coastal high-salt-spray areas, and chemical plants.

Product Features

Core Structure : Uses 45° fully mitered step-lap lamination technology, with core limbs and yokes clamped by high-strength tie straps or plates. The application of high-permeability grain-oriented silicon steel (B30R090 or higher grade) minimizes both hysteresis and eddy current losses.

Low Voltage Windings : Wound with copper foil, fixed at the ends with resin end rings. The copper foil width equals the winding height, providing uniform axial ampere-turn distribution and extremely high resistance to short-circuit electromagnetic forces. Layer insulation uses pre-impregnated DMD material.

High Voltage Windings : Wound in layered segments using Class H enameled rectangular copper wire, with resin cast between each layer, forming a robust glass-fiber-reinforced epoxy resin composite insulation. Taps are led out from the middle of the winding to improve impulse voltage distribution.

Temperature Control & Protection System : Each phase winding has pre-embedded PT100 platinum RTDs for real-time hot spot temperature monitoring. The accompanying intelligent temperature controller features: digital coil temperature display, over-temperature alarm (adjustable setpoint), over-temperature trip output, and automatic fan start/stop (if forced air cooling is optionally installed).

Enclosure Options : Optional IP20 (solid objects), IP23 (vertical dripping water), or IP40 (small particles) protection rating enclosures, made of stainless steel, aluminum alloy, or powder-coated cold-rolled steel. Enclosures feature ventilation openings and interlocked door locks.

Connection & Installation : High voltage side uses silicone rubber fully shielded/full insulation cable terminals or conventional terminals; low voltage side uses tin-plated copper busbars. The transformer bottom is equipped with a channel steel base and rollers for easy positioning and movement.

Product Application

The SCB13 Copper Winding Dry Type Power Transformer is ideal for the following scenarios:

High-Rise Buildings & Commercial Centers : Installed in basement or equipment floor distribution rooms, powering elevators, HVAC, lighting, and fire protection systems. Its non-flammable characteristic meets building fire codes, and low noise does not disturb residents upstairs.

Industrial & Mining Enterprises : Power distribution systems in automobile manufacturing plants, electronic component factories, and precision machining workshops. All-copper windings withstand current surges from frequent motor starts/stops, providing good voltage stability.

Renewable Energy : Step-up grid connection for distributed PV power stations, auxiliary power transformers for wind farms, isolation transformers for energy storage systems. High energy efficiency reduces power conversion losses.

Transportation Infrastructure : Station service transformers for subway stations, power supplies for high-speed railway signal buildings, airport terminal power distribution centers, port shore power systems. Moisture resistance and short-circuit withstand capability meet the high reliability demands of rail transit.

Data Centers & Communication Base Stations : Providing clean, stable power for servers, switches, and UPS systems. Quiet operation (typically below 55dB) does not disturb data center personnel.

Production Details

Low Voltage Copper Foil Winding Process

Low voltage windings are wound using full-width copper foil on specialized foil winding machines. Copper foil edges are rounded to prevent corona discharge. With each turn, DMD pre-impregnated insulation paper is automatically placed between layers, and online tension control ensures the copper foil is tightly wound. After winding completion, the entire assembly is placed into a mold for epoxy resin vacuum casting, forming a monolithic, void-free structure. This process improves the short-circuit withstand capability of low voltage windings by over 30% compared to wire-wound structures.

High Voltage Segmented Layer Winding

High voltage windings are divided into 4-6 segments (pancakes), with each segment further divided into 2-4 layers. Ducts (or air channels) between segments improve heat dissipation, while layering reduces interlayer voltage. Taps are taken from specific turns of specific segments and marked with different colored leads. All connections use argon arc welding or cold pressure welding to ensure minimal contact resistance.

Core Noise Reduction Treatment

After core lamination completion, the entire core is vacuum pressure impregnated with a specially formulated noise-reducing insulating varnish, damping micro-vibrations between silicon steel sheets and between sheets and clamping parts. High-temperature silicone rubber cushions are placed between core and windings, and between windings and clamping parts. With these treatments, no-load noise can be kept below 55dB (for 315kVA and below), comparable to the hum of a household refrigerator.

Comprehensive Factory Testing

Every SCB13 Copper Winding Dry Type Power Transformer undergoes the following tests before leaving the factory: winding resistance measurement; voltage ratio measurement and vector group verification; short-circuit impedance and load loss measurement; no-load current and no-load loss measurement; insulation resistance and dielectric dissipation factor measurement; applied voltage withstand test; induced voltage withstand test; partial discharge measurement. Test data is automatically recorded and a factory test report is provided with the shipment.

Product Parameter (Specification)

Packaging & After-Sales

Packaging Method

1. Transformer body wrapped with waterproof PE film, critical areas covered with soft protective padding.

2. Packed in sturdy export-grade plywood crates with pallet bottoms for forklift handling.

3. Interior of crates filled with expanded polyurethane or honeycomb cardboard cushioning to prevent transport vibration damage.

4. Clear markings on the outside: center of gravity, lifting points, moisture-proof, do not tip.

After-Sales Service

1. Free Warranty Period: 12 months from date of shipment.

2. Any failure caused by design, material, or manufacturing defects during the warranty period will be repaired or replaced free of charge by our company (including reasonable transport costs).