High-voltage power transformers (above 10kV) are widely used across various sectors, covering both residential and industrial fields. Below is a detailed summary of the main application scenarios and their technical features:
I. Urban and Civil Applications
1. Residential Communities and Commercial Centers
The 10kV-rated combination transformer is widely utilized in new residential complexes, shopping centers, and high-rise buildings due to its compact size and fully sealed structure. Its design is extremely space-efficient—only about one-third the size of a European-style integrated transformer of the same capacity—which supports efficient land use. Additionally, the Dyn11 connection configuration ensures voltage stability and reduces issues related to neutral point drift.
2. Urban Public Facilities
These transformers are also employed in urban infrastructure, including street-lighting distribution networks, park landscaping, and roadways. Aesthetic box-type transformers can be customized to integrate seamlessly with the surroundings. Moreover, their fully insulated design minimizes the need for additional safety clearances, making them suitable for areas with high pedestrian traffic.
II. Industrial and Energy Sectors
3. Industrial Parks and Heavy Industries (Mining and Manufacturing)
In industrial and mining enterprises where power loads are highly complex, high reliability of supply is crucial. Combination transformers in these settings offer flexible switching between ring network and terminal configurations, and feature dual fuse protection to reduce maintenance costs. They are designed to operate reliably in extreme conditions, with operating temperature ranges from –30°C to +40°C. Oil-immersed transformers are common in heavy industries, while dry-type transformers are preferred in mining environments that require high explosion resistance.
4. New Energy Generation Systems
In renewable energy systems such as photovoltaic power plants and wind farms, there is a need to step up the low voltage generated to grid voltage levels. For instance, 10kV box-type transformers are typically used for grid connection in distributed photovoltaic installations, while extra-high-voltage transformers are vital for long-distance power transmission to reduce losses. The photovoltaic step-up box-type transformer, for example, is a critical component in renewable energy projects.
III. Transportation and Infrastructure
5. Rail Transit and Electric Vehicle Charging Stations
Urban metro systems and high-speed rail networks depend on stable power supplies. Box-type transformers installed within substations deliver power to the overhead contact lines used in these systems. Similarly, electric vehicle charging stations use transformers to convert 10kV high voltage into the specific voltage required by charging units, thereby supporting high-current rapid charging capabilities.
6. Power Grid Upgrades and Smart Grid Applications
Extra-high-voltage transformers (rated at 330kV and above) play a critical role in cross-regional power transmission. The ongoing development of smart grids is driving demand for digital transformers equipped with remote monitoring and fault diagnosis functionalities. Converter transformers, for example, are essential components in ultra-high voltage direct current (UHVDC) transmission systems.
IV. Special Scenarios
7. Emergency and Backup Power Supply
Critical facilities such as hospitals and data centers require redundant transformers to ensure uninterrupted power. Designs incorporating high-flame-point oil reduce fire risks, making these transformers suitable for installation within buildings where safety is paramount.
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Technical Adaptability
Environmental Tolerance:
Most transformer models are designed to operate under challenging environmental conditions, including altitudes up to 1000 meters, relative humidity of up to 95%, wind speeds up to 34 m/s, and seismic events.
Efficiency Characteristics:
Features such as low-loss silicon steel cores and dual sensitive fuses contribute to lower operational costs. Additionally, these transformers are built with an overload capacity that meets sudden load demand spikes.
Future Trends
With the evolving landscape of smart grids and renewable energy, high-voltage transformers are set to advance towards higher efficiency and smarter operations. Future developments include the integration of IoT sensors for real-time monitoring and diagnostics, as well as the use of environmentally friendly materials, such as biodegradable insulating oils, to enhance sustainability.