step up transformer and step down transformer

1.Product Introduction:

1. The 35kV-class oil-immersed power transformer serves as a core equipment for power transmission and distribution in 35kV voltage grids. Utilizing electromagnetic induction principles, it reduces high-voltage power from 35kV to user-required low voltages of 10kV or 0.4kV. This device is widely deployed in regional substations, large industrial parks, wind power generation facilities, photovoltaic power stations, hydropower projects, and critical power supply systems for industrial and mining enterprises.
   The product employs high-quality iron cores, high-conductivity copper/aluminum conductors, and advanced insulating oil, designed and manufactured in compliance with national standards such as GB/T 6451 and GB/T 1094. It offers significant advantages including low energy loss, minimal noise, high reliability, and extended service life, making it the preferred equipment for large-scale outdoor power supply applications. It is particularly suitable for projects requiring extremely high continuous power supply stability.

   
   

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   2. Core Technical Parameters（customizable）

3. | Parameter | Indicator---|--- | ---Rated Voltage | High Voltage: 35kV (±3×2.5%/±5%); Low Voltage: 10kV/0.4kV Rated Capacity | 30kVA to 25,000kVA Rated Frequency | 50Hz Connection Group | Dyn11 (most common)/Yyn0 Cooling Method | ONAN (oil-immersed self-cooling)/ONAF (oil-immersed air-cooling)/OFAF (forced oil circulation air-cooling) Voltage Regulation | No-load regulation (cylindrical/disc type), On-load regulation (customizable) Insulation Level | Lightning surge: 185kV; Power frequency induction: 95kV Short-circuit Impedance | 4% to 17.5% (matched by capacity class) Operating Noise | 55dB to 80dB (measured 1m from equipment) Operating Environment | Altitude ≤1000m; Ambient Temperature-30℃ to +40℃ (customizable for special regions)

4. 3. Key Features

5. 1. Low Losses: Utilizes premium oriented silicon steel core with advanced seam technology, achieving 10%-30% reduction in no-load losses compared to national standards. Coils employ high-quality oxygen-free copper rods/high-conductivity aluminum rods for low-load losses, fully compliant with China's Grade A energy efficiency standards. This results in extremely low annual operating electricity costs and high comprehensive return on investment.

6. Short-circuit resistance and high mechanical strength: The coil employs novel paper insulation or epoxy glass fiber draw wires treated with special drying processes. The iron core adopts a through-type screw clamp structure, ensuring robust stability and exceptional resistance to sudden short-circuit surges. This design effectively prevents coil deformation and burnout incidents, guaranteeing equipment safety operation for over 30 years.

7. Excellent heat dissipation and strong overload capacity: Featuring a fully sealed structure equipped with corrugated oil tanks or tubular radiators, it offers large heat dissipation area and superior cooling performance. The oil-immersed medium insulation exhibits outstanding thermal insulation and conductivity properties, providing robust short-term overload capacity, making it suitable for industrial applications with significant load fluctuations.

8. Fully sealed and maintenance-free design: Utilizes an integrated sealing structure with oil-resistant rubber gaskets to achieve complete tank sealing, effectively preventing oil leakage and seepage. Under normal operating conditions, it requires minimal maintenance, eliminating the need for regular oil changes or filtration, resulting in extremely low maintenance costs.

9. Enhanced protection: The outdoor oil tank surface is treated with hot-dip galvanizing followed by spray coating for corrosion resistance, UV protection, and rainproofing. Equipped with comprehensive oil level gauges, gas relays, and temperature monitoring devices, operational status is clearly displayed, making it suitable for harsh environments such as outdoor substations, photovoltaic wind power step-up stations, etc.

10. Low noise and eco-friendly: By optimizing the iron core structure, adopting noise-absorbing pads, and employing advanced coil winding techniques, operational noise is significantly reduced, meeting environmental standards. This makes it suitable for power supply projects in urban areas and residential zones with acoustic environment requirements.
    4. Application Scenarios

11. 1. Large-scale Industrial and Energy Bases • Core Applications: Steel mills, refineries, chemical plants, and large-scale smelting facilities.
    • Demand matching: High capacity, high reliability, and long service life to ensure uninterrupted continuous production.

12. New Energy Power Stations • Core Applications: Wind farms, photovoltaic power plants, hydropower stations, and biomass power plants.
    • Demand matching capability: Functioning as a step-up transformer, it elevates low-voltage electrical energy to 35kV for grid integration, featuring exceptional interference resistance and weather resistance.

13. Urban Power Grid and Regional Substations • Core Applications: 35kV regional substations, large urban complexes, office building clusters, and high-speed railway stations.
    • Demand matching: As a regional power hub, stable power distribution with low loss and low noise levels are core requirements.

14. Infrastructure and Mining/Industrial Core Applications: Railway traction stations, airports, ports, mines, and pumping stations for oil and gas pipelines in remote areas.
    • Demand matching: Stable outdoor operation, resistant to windblown sand and extreme cold, ensuring long-term power supply for remote areas and large-scale infrastructure.

15. Rural Power Grid and Urban-Rural Construction • Core Applications: Rural power grid upgrading, county-level central substations, and large-scale township industrial zones.
    • Demand matching: High cost-effectiveness and low maintenance costs, capable of meeting power transmission requirements for large-scale areas.