Box-type transformer models and parameters
05-26 2025 | By:
Box-type transformers have many models, and the parameters of different models are also different. The following is an introduction to some common box-type transformer models and their parameters:
Common models and parameters
SCB10 series
Model examples: SCB10-100/10/0.4, SCB10-160/10/0.4, SCB10-200/10/0.4, etc., all the way to SCB10-2000/10/0.4.
Rated capacity: 100kVA to 2000kVA.
Rated voltage: High voltage side is usually 10kV, low voltage side is 0.4kV.
Short-circuit impedance: generally 4%-6%.
Rated frequency: 50Hz.
Wiring group: Yyn0 or Dyn11.
Features: SCB10 series is a new energy-saving transformer, widely used in urban distribution networks and power supply systems of industrial and mining enterprises.
Other small and medium-sized transformers
Rated capacity: 50kVA to 2500kVA.
Rated voltage: 10/0.4kV.
Short-circuit impedance: 4%-6%.
Rated frequency: 50Hz.
Wiring group: Yyn0 or Dyn11.
Features: High-efficiency small and medium-sized transformers, widely used in urban distribution networks, rural power grids and distribution systems of industrial and mining enterprises.
Transformers for special industrial needs
Rated capacity: 315kVA to 20000kVA.
Rated voltage: 10/0.4kV.
Short-circuit impedance: 6%-8%.
Rated frequency: 50Hz.
Wiring group: Yyn0 or Dyn11.
Features: Designed to meet special industrial needs, widely used in steel, metallurgy, chemical industry and other industries.
Special environment transformers
Rated capacity: 30kVA to 1250kVA.
Rated voltage: 10/0.4kV.
Short-circuit impedance: 4%-6%.
Rated frequency: 50Hz.
Wiring group: Yyn0 or Dyn11.
Features: Specially used in special environments (such as chemical industry, mining, etc.), with moisture-proof, dust-proof and explosion-proof characteristics.
Experimental test transformer
Rated capacity: 10kVA to 500kVA.
Rated voltage: 10/0.4kV.
Short-circuit impedance: 4%-6%.
Rated frequency: 50Hz.
Wiring group: Yyn0 or Dyn11.
Features: Specially used for experiments, tests, calibration and other work in power systems.
Other key parameters
Insulation level: High-voltage side power frequency withstand voltage 42kV, lightning impulse withstand voltage 75kV.
Protection level: The protection level of the box is usually IP30 or IP20.
Shell material: generally made of galvanized steel or aluminum alloy, with good anti-corrosion performance.
Service life: The service life of the transformer can reach 30 years.
Cooling method: Dry-type transformers usually use natural air cooling (AN) or forced air cooling (AF); oil-immersed transformers may use oil circulation cooling and other methods.
Noise level: The noise level of oil-immersed transformers is usually less than 55dB, and the noise level of dry-type transformers is usually less than 65dB.
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