air type transformer
1. Ultra-high energy efficiency: even greater energy savings over long-term use.
2. Safety: Oil-free; constructed from epoxy resin; fire-resistant and explosion-proof; suitable for indoor installation and mounting in distribution cabinets.
3. High reliability: high short-circuit resistance, small partial discharge, stable insulation performance.
4. Ultra-low noise: Optimized iron core, low noise, suitable for hospitals, schools and residential areas.
5. Maintenance-free: moisture-proof, dust-proof and anti-pollution, no need to replace oil, longer service life.
I. Product Definition and Applicable Standards
TransformerThe dry-cast, epoxy-cast SCB is a three-phase, ultra-low-loss distribution transformer with 12 cores. It further reduces no-load and load losses, improves noise performance and short-circuit resistance, while maintaining an oil-free, highly flame-resistant, and explosion-proof design.
Applicable standards:
IEC 60076 series
Insulation class: class F (maximum working temperature 155℃)
Fire resistance complies with GB/T 14598.13 standard, fire resistance class FV0, does not support combustion, does not emit toxic fumes.
The oil-free design completely eliminates oil leakage and the risk of fire.
II. Key technical parameters (customizable)
Element |
Standard Specification |
Notes |
Rated voltage (HV/LV) |
High voltage: 35 kV, tap from the circuit ±2×2.5% Low voltage: 0.4 kV (three-phase four-wire) |
Adjustable range 0.69kV/1.14kV; tap changer works only when power is off. |
Nominal lifting capacity |
Standard power: 30 kVA–2500 kVA, up to 3150 kVA |
100,200,400,630,1000,1600,2000kVA |
Connection group |
Dyn11 (default) |
High-voltage delta circuit, low-voltage star circuit with neutral; suitable for grounding and relay protection. |
Cooling mode |
AN / AF |
AN: 120% continuous load; AF: 150% continuous load |
Insulation and temperature increase |
Class F; winding 100 kOhm, core 80 kOhm. |
Vacuum casting + fiberglass; PD ≤10 pC |
Degree of protection |
IP20 standard, IP30/IP40 optional. |
IP20: For clean room use; IP40: For outdoor/heavy dust use |
Environmental conditions |
Altitude ≤1000 m; temperature from -5℃ to +40℃; humidity ≤95%. |
Thermal insulation is reduced for use at high altitudes; frost-resistant construction is optional. |
III. Features of the design solution
Main system
Highly permeable grain oriented cold rolled silicon steel (0.30-0.35 mm), 45° step lap joint.
Epoxy coating for moisture and rust resistance. Attached with non-magnetic straps, low vibration. Noise level: 2-3 dB(A) lower than SCB11, typically ≤52 dB(A).
Winding technology
Low voltage winding: high-precision copper foil; High voltage winding: oxygen-free copper conductor.
Vacuum cast epoxy resin with fiberglass reinforcement, free of bubbles and voids, extremely high mechanical strength. Uniform current distribution, low eddy current losses. Excellent resistance to short circuits and lightning surges.
Temperature control and monitoring
Cold rolled steel with electrostatic spraying, optimized ventilation louvers.
IP30/IP40 protection rating, moisture- and dust-proof design. Removable housing for easy maintenance. Copper terminals with low contact resistance and a reliable connection.
Tap changer and wiring
Off-circuit tap changer on high voltage side with stable contact.
Low voltage copper terminals for easy wiring and power expansion.
IV. Key Performance Benefits
Increased energy efficiency
High efficiency and energy saving
With a consumption frequency of 8000 hours per year and 70% load, 1000 kVA power can save about 500 kWh per year compared to SCB11.
Ultra safe and environmentally friendly
Oil-free, fire-resistant (fire resistance class FV0), does not emit toxic gases.
Can be installed directly in the energy consumption centers of buildings (high-rise buildings, hospitals, metro) without oil separator pits or fire partitions.
High adaptability to the environment
Fully sealed design: waterproof, dustproof, salt fog resistant, prevents condensation.
Stable in coastal, high-humidity, and heavily polluted industrial conditions. No pre-drying required after long periods of storage.
High reliability and no need for maintenance
Partial discharge ≤10 pC, slow aging of insulation.
V. Typical areas of application
Power grids: 35 kV substations, reconstruction of urban/rural networks, step-down substations in industrial parks.
Public buildings: offices, shopping centers, airports, metro, hospitals, schools.
Hazardous industries: chemical plants, coal mines, oil refineries, pharmaceutical plants.
Coastal areas and areas with high humidity
New energy sources: booster substations for small and medium-sized solar/wind power plants.
