Applications of Medium and High-Voltage Power Transformers
Medium and high-voltage power transformers are core equipment in the power system. Their applications span the entire process of electrical energy from generation, transmission to distribution, and they are crucial for achieving voltage transformation and efficient power transmission.
Below is a detailed explanation of their main application scenarios:
1. Power Generation
Application Scenarios: Various power plants such as thermal, hydroelectric, nuclear, wind, and solar.
Core Function: To step up the medium and low-voltage alternating current generated by the generator (e.g., 10kV, 15.75kV) to high or extra-high voltage (e.g., 110kV, 220kV, 500kV, 1000kV) for long-distance, low-loss power transmission.
Typical Equipment: Generator Step-up Transformer (GSU).
2. Power Transmission
Application Scenarios: High-voltage, extra-high voltage, and ultra-high voltage transmission lines connecting power grids in different regions.
Core Functions:
At the sending and receiving ends of transmission lines, to cooperate with power plants and substations for voltage step-up and step-down transformations.
At grid hub substations, to realize interconnection and power exchange between power grids of different voltage levels.
Typical Equipment: Transmission Transformers, typically referring to large power transformers with voltage levels of 220kV and above.
3. Power Distribution
Application Scenarios: Various levels of substations and distribution stations in cities, industrial parks, commercial areas, and residential areas.
Core Function: To step down the electrical energy transmitted by high-voltage transmission lines (e.g., 110kV, 220kV) to medium voltage (e.g., 10kV, 20kV, 35kV), and then further step down to low voltage (380V/220V) for end-users.
Typical Equipment: Distribution Transformers, mainly with voltage levels of 10kV, 20kV, and 35kV, including both oil-immersed and dry-type.
4. Industrial Users
Application Scenarios: Large factories, mines, metallurgy, chemical industry, data centers, rail transit, etc.
Core Functions:
To provide power with specific voltage levels for large-scale production equipment.
To provide customized power transformation for special process requirements, such as:
Furnace Transformers: Provide high current and low voltage for electric arc furnaces, induction furnaces, etc.
Rectifier Transformers: Convert alternating current to direct current for electrolysis, electroplating, etc.
Traction Transformers: Provide power for electric locomotives in railways and urban rail transit.
Mining Transformers: Adapt to special underground mine environments (e.g., explosion-proof, moisture-proof).
Typical Equipment: Special Transformers.
5. Infrastructure & Construction
Application Scenarios: High-rise buildings, commercial complexes, airports, ports, tunnels, etc.
Core Function: To provide safe and reliable power supply for these locations. Due to space constraints and fire safety requirements, dry-type transformers are usually used.
Typical Equipment: Dry-type Distribution Transformers, Compact Substations.
6. New Energy Integration
Application Scenarios: Large-scale photovoltaic power plants, wind farms, energy storage power stations.
Core Functions:
To step up the power generated by new energy generators (usually at low voltage) before integrating it into the grid.
In energy storage systems, to achieve voltage transformation and power quality control during charging and discharging processes.
Typical Equipment: Wind Turbine Transformers, PV Grid-connection Transformers, Energy Storage Transformers.
7. Grid Voltage Regulation & Control
Application Scenarios: Grid load centers, areas with large voltage fluctuations.
Core Function: To adjust the output voltage under load conditions through On-load Tap Changer Transformers (OLTC) to stabilize grid voltage levels and improve power quality.
In summary, medium and high-voltage power transformers are indispensable “heart” equipment in the power system, and their wide-ranging applications and importance are self-evident. From magnificent ultra-high voltage transmission projects to the urban power supply around us, they all rely on their silent support.