Feixiangda FX-SGB Series Special New Step-up and Step-down Transformer for Tunnel Power Supply is a special transformer equipment designed to solve the power supply difficulties in long tunnel construction. This product adopts new foil winding technology, with outstanding advantages such as high efficiency, low cost, fast installation, and easy movement.
This series is divided into Tunnel Power Booster and Tunnel Power Step-down Device, used in pairs. By stepping up the 400V output voltage from the tunnel portal box-type transformer to 900V, transmitting it via ordinary low-voltage cables to the deep tunnel, and then stepping it down back to 400V/430V for construction equipment.
Power Range: 1-3000KVA
Number of Phases: Three-Phase
Efficiency: ≥98%
Cooling Method: Fan Cooling/Natural Air Cooling/Temperature-controlled Forced Air Cooling
Operation Mode: Long-term continuous operation
The Special New Step-up and Step-down Transformer for Tunnel Power Supply works based on the electromagnetic induction principle, adopting a step-up + step-down combined solution:
Front-end Step-up: The 400V output voltage from the tunnel portal box-type transformer is input into the tunnel power booster to be stepped up to 900V. By increasing the voltage, the line current is reduced, thereby decreasing the line voltage drop of long-distance transmission.
Mid-end Transmission: The stepped-up 900V voltage is transmitted via ordinary 0.6/1KV national standard power cables (240/185mm²) to the rear end of the delivery pump of the tunnel secondary lining trolley, effectively ensuring long-distance power supply.
End-end Step-down: At the front end of the power equipment, the 900V high voltage is converted back to 400V/430V through the tunnel power step-down device for normal use by equipment such as delivery pumps and wet-spraying trucks (customized according to actual power consumption).
New Foil Winding Technology: Adopts semi-automatic foil winding machine combined with manual labor using customized whole aluminum foil, featuring high tightness, not easy to loosen, strong overload capacity, high insulation grade; load efficiency up to 80%, 30% higher than traditional types.
| Feature | Description |
|---|---|
| Solve Long-distance Power Supply | Specially designed for single-lane 3km+ long tunnel construction power supply, perfectly solving low terminal voltage and equipment start-up issues. |
| Replace HV Box Transformer | Replaces traditional high-voltage box-type transformer solutions, greatly reducing costs for application, purchasing HV box transformers and HV cables. |
| Cost Reduction About 2/3 | Reduces power supply production cost by about two-thirds, improves production efficiency and output value. |
| Fast Installation Only 3 Hours | Can be installed in about 3 hours with good preparation; can be installed during muck-out time without affecting production. |
| Small Size, Easy to Move | Smaller size than high-voltage box-type transformers, convenient for installation and movement, adapts to complex tunnel environments. |
| Use Existing Low-voltage Cables | Can use original low-voltage cables of 0.6/1kV (240/185mm²), no need to replace, saving costs. |
| Ensure 3km Tunnel Power Supply | Perfectly ensures power supply for a single-lane 3-kilometer tunnel. |
| New Foil Winding Technology | Adopts semi-automatic foil winding machine with manual labor, using customized aluminum foil, high tightness, not easy to loosen, strong overload capacity, high insulation grade. |
| High Load Efficiency | New foil winding process load efficiency up to 80%, 30% higher than traditional types. |
| High Efficiency | Efficiency ≥98%, low energy conversion loss. |
| Insulation Grade F | Uses Class F insulation material, good heat resistance, safe and reliable. |
| High Insulation Resistance | Insulation resistance ≥5MΩ, safe and reliable. |
| Item | Parameter |
|---|---|
| Product name | Special New Step-up and Step-down Transformer for Tunnel Power Supply |
| Series | FX-SGB |
| Rated capacity | 1-3000KVA |
| Number of Phases | Three-Phase |
| Frequency | 50/60HZ |
| Input (Booster) | 400V |
| Output (Booster) | 900V |
| Input (Step-down) | 900V |
| Output (Step-down) | 400/430V (Customizable) |
| Insulation grade | Class F |
| Insulation resistance | ≥5MΩ |
| Withstand Voltage Test | 3500V/min |
| Waveform Distortion | ≤0.1% |
| Cooling Method | Fan Cooling/Natural Air Cooling/Temperature-controlled Forced Air Cooling |
| Display Mode | Analog Meter Display |
| Operation Mode | Long-term continuous operation |
| Application | Description |
|---|---|
| Expressway Tunnel | Solves the low terminal voltage problem caused by long-distance power supply in expressway long tunnels, ensuring normal operation of delivery pumps, spray humidifiers, etc. |
| High-speed Railway Tunnel | Provides stable power for high-speed railway tunnel construction equipment, ensuring construction progress. |
| Urban Subway Tunnel | Adapts to the narrow space and long power supply distance of subway tunnels, providing compact step-up/down solutions. |
| Water Diversion Tunnel | Provides reliable power supply guarantee for long-distance water diversion tunnel construction. |
| Extra-large Bridge Construction | Solves voltage fluctuation problems in long-distance power supply during extra-large bridge construction. |
| Tunnel Delivery Pump | Specially ensures stable power supply for tunnel delivery pumps. |
| Spray Humidifier/Wet Spray Truck | Provides stable voltage for spray humidifiers, ensuring shotcrete construction quality. |
| Air Compressor | Solves the problem of air compressor failing to start due to low voltage. |
| Three-arm Rock Drilling Jumbo | Ensures power demand for rock drilling jumbos, ensuring excavation efficiency. |
| Roadheader | Provides stable and reliable power for tunnel roadheaders. |
| Client | Project | Model | Capacity |
|---|---|---|---|
| China Construction Fourth Bureau | Wengma Railway Luojialin Tunnel | FX-SGB Foil Winding Booster | 800KVA |
| China Railway 20th Bureau | Wengma Railway Jixincun No.2 Tunnel | Foil Winding Tunnel Booster | 630KVA |
| China Railway Third Bureau | Sichuan-Tibet Railway Ya'an-Linzhi Tunnel Section 12 | Tunnel Power Booster | 900KVA |
| China Railway Tunnel Bureau | Dianzhong Water Diversion Longtou Village Tunnel | Foil Winding Booster | 400KVA |
| China Railway 20th Bureau | Wengma Railway | Foil Winding Booster | 800KVA |
| Item | Detail |
|---|---|
| Quality System | ISO9001 Quality Management System Certification |
| Product Certification | CE Certified (Compliant with relevant standards) |
| Testing Process | 100% full inspection + 48-hour full-load aging test |
| Warranty | 12 months standard warranty, extendable to 36 months |
| After-sales Service | Lifetime technical support, 7×24 rapid response |
| Advantage | Description |
|---|---|
| Rich Engineering Experience | Successfully provided tunnel power solutions for China Railway Third Bureau, China Construction Fourth Bureau, China Railway 20th Bureau and other major construction units, products verified by rigorous engineering. |
| Source Factory | Nearly 20 years of power equipment manufacturing experience, own production lines, cost-controlled, guaranteed delivery. |
| Quality Assurance | 100% inspection + 48-hour aging test, ISO9001 certified, product yield rate over 99.7%. |
| Flexible Customization | Supports non-standard customization for capacity, voltage, etc., meeting special requirements of different tunnel projects. |
| Global Service | 7×24 technical support, 12-month warranty (extendable), lifetime maintenance. |
| Professional Team | Experienced R&D engineers and foreign trade team, providing selection guidance and technical consultation. |
Q1: What problems does the FX-SGB Series Tunnel Step-up/down Transformer mainly solve?
A: It mainly solves the problems of low terminal voltage and large voltage fluctuation caused by long-distance power supply in the construction of long tunnels and extra-large bridges for expressways, high-speed railways, urban subways, water diversion projects, etc., which affect normal start-up and operation of equipment.
Q2: What are the advantages of this product compared to traditional solutions?
A: 1. Low cost, reduces power supply production cost by about two-thirds; 2. Time saving, installation only 3 hours; 3. Easy to move, small size; 4. Use existing low-voltage cables, no replacement needed; 5. Ensure single-lane 3km tunnel power supply.
Q3: How do the booster and step-down device work together?
A: The booster is installed at the tunnel portal, stepping up 400V to 900V; the step-down device is installed at the front end of the power equipment, stepping down 900V back to 400V/430V. By increasing voltage to reduce line loss, long-distance power supply is achieved.
Q4: What is the efficiency of this product?
A: Efficiency ≥98%, low energy conversion loss.
Q5: What is the insulation grade of this product?
A: Insulation grade Class F, insulation resistance ≥5MΩ, withstand voltage test 3500V/min.
Q6: What engineering cases does this product have?
A: It has been adopted by many national key engineering projects including China Railway Third Bureau Sichuan-Tibet Railway, China Construction Fourth Bureau Wengma Railway, China Railway 20th Bureau Wengma Railway, China Railway Tunnel Bureau Dianzhong Water Diversion, etc.
Q7: What winding technology does this product use?
A: It adopts new foil winding technology, using semi-automatic foil winding machine with manual labor to wind customized whole aluminum foil, with high tightness, strong overload capacity, load efficiency up to 80%, 30% higher than traditional types.
