Ⅰ.What is a compact transformer
Compact Transformers are power transformers that are miniaturized in size and lightweight in weight through innovative design and advanced manufacturing processes. This type of transformer, while maintaining the performance of traditional transformers, significantly reduces the equipment footprint and space volume by optimizing the internal structure, adopting high magnetic permeability materials and improving the heat dissipation system. Ideal for space-constrained scenarios.

Ⅱ.Core Working Principle
The compact transformer is based on the principle of electromagnetic induction by realizing the energy transfer of the core magnetic circuit. Optimized design with three-dimensional magnetic field to reduce magnetic circuit length; High magnetic permeability material (such as nanocrystalline alloy) to improve magnetic flux density; Optimized winding arrangement to shorten winding average turn length. These technical means, while ensuring performance, effectively reduce the volume of the core and winding, and achieve miniaturization of the overall structure.
Ⅲ.Six core strengths
Space utilization is improved by more than 40%: by adjusting the structural design optimization, our transformers are 30%-50% less volumetric than traditional transformers under the same capacity.
Weight reduction of 30%: Kechang Electric uses high-strength composite casing and aluminum alloy parts, which greatly reduces its overall weight and simplifies the installation base, thus reducing transportation and lifting costs.
Energy Efficiency Level 1 Standard: Using high magnetic permeability silicon steel sheet (loss ≤0.9 W/kg), no-load loss is 25% lower than conventional products, SCB14 type dry-type transformer load loss is optimized 8%-10%.
Prominent ease of installation: the modular design enables quick assembly and the installation cycle is reduced by 50%. The pre-installed substation can be put in place, wired and put into operation within 24 hours.
Full life cycle cost optimization: Although the initial investment is slightly higher, the space cost saved, installation cost and operating electricity cost make the 3-5 year combined cost lower than the regular product.
Highly adaptable: IP67 level protection can be selected, can adapt to ambient temperature of -25 ℃to +45℃, and continuous and stable operation at 3000 meters above sea level.
Ⅲ.Key technological breakthroughs
Structural innovation: using three-dimensional rolled iron core technology, the length of the magnetic circuit is reduced by 20%; the high voltage winding adopts a segmented design to optimize the electric field distribution.
Material upgrade: using amorphous alloy material, the no-load loss is reduced by 70%; the insulation system is made of high temperature resistant material (class H, 180℃), allowing higher temperature rise operation.
Breakthrough in heat dissipation: oil-immersed type adopts chip radiator + intelligent air cooling, which increases heat dissipation efficiency by 30%; dry-type transformer realizes natural cooling instead of forced air cooling through internal air duct optimization.
Intelligent integration: Integrate temperature monitoring, local discharge detection and remote communication modules to achieve real-time status monitoring and early warning.

Ⅳ.Typical application scenarios
Urban power distribution: underground substations in commercial centers, saving valuable above-ground space Industrial plants: installed nearby next to the production line, reducing line losses New energy field: photovoltaic power station boost transformer, adaptable to harsh outdoor environments Rail transit: installed in tunnels, meeting strict space restrictions Building power distribution: floor power distribution room, solving the problem of narrow space
A typical case shows that a subway project uses a compact transformer, which reduces the area of the substation by 40%; a commercial complex uses a pre-installed compact substation, which saves 30% of the land cost.

Ⅴ.Selection key considerations
Capacity matching: Choose based on 1.2-1.3 times the actual load, consider the 5-year development margin Energy efficiency level: give priority to first-level energy efficiency products, although the price is 15% higher, the investment can be recovered through electricity bill savings in 2-3 years Installation environment: indoor installation Pay attention to ventilation and heat dissipation, and consider protection level and anti-corrosion requirements outdoors. Operation and maintenance needs: Evaluate maintenance convenience and choose easy maintenance Modularly designed models
Important parameter reconciliation: short-circuit impedance (4%-6%), noise level (≤55dB), insulation class (class F or H) Supplier assessment: Type test report requested, with special attention to temperature rise and short-circuit test results
Ⅵ.Main components
Iron core system: using three-dimensional rolled iron core or stepped seam iron core, magnetic circuit symmetry, low loss Winding structure: high voltage winding with copper foil or segmented coil, low voltage winding with foil winding or spiral structure Insulation system: dry type with epoxy resin cast, oil-immersed type with oil-paper composite insulation
Cooling device: Configure self-cooling or air-cooling system according to capacity, large capacity products use forced oil circulation cooling Protection system: integrated temperature control, pressure release and online monitoring device Shell design: made of stainless steel or composite material, compact structure, high protection level

Kechang Electric Compact Transformer has passed the National Energy Efficiency Certification and holds a number of structural design patents. The product volume is more than 30% less than the regular product, and the noise is reduced by 5-10 decibels, providing an optimized solution for space-constrained scenarios. Specialized technical team can provide customized design to meet special space and performance requirements.
| Model Number | Rated Volume Quantity (KVA) |
Voltage Combination(KV) | Connection Group Label | No-load Loss (W) |
Load Loss (W) |
No-load Electricity (%) |
Short Circuit Resistance (%) |
||
| High Voltage | High Voltage Tap Range | Low Voltage | |||||||
| SC14-M-30 | 30 | 6 6.3 10 10.5 |
+3 -1 ±5% ±2×2.5% or ×2.5% |
0.4 | Dyn11 or Yyn0 |
130 | 640 | 2.0 | 4 |
| SC14-M-50 | 50 | 185 | 900 | 2.0 | 4 | ||||
| SC14-M-80 | 80 | 250 | 1240 | 1.5 | 4 | ||||
| SC14-M-100 | 100 | 270 | 1415 | 1.5 | 4 | ||||
| SC14-M-125 | 125 | 320 | 1665 | 1.3 | 4 | ||||
| SC14-M-160 | 160 | 365 | 1915 | 1.3 | 4 | ||||
| SC14-M-200 | 200 | 420 | 2275 | 1.1 | 4 | ||||
| SC14-M-250 | 250 | 490 | 2485 | 1.1 | 4 | ||||
| SC14-M-315 | 315 | 600 | 3125 | 1.0 | 4 | ||||
| SC14-M-400 | 400 | 665 | 3590 | 1.0 | 4 | ||||
| SC14-M-500 | 500 | 790 | 4390 | 1.0 | 4 | ||||
| SC14-M-630 | 630 | 910 | 5290 | 1.0 | 4 | ||||
| SC14-M-630 | 630 | 885 | 5365 | 0.85 | 6 | ||||
| SC14-M-800 | 800 | 1035 | 6265 | 0.85 | 6 | ||||
| SC14-M-1000 | 1000 | 1205 | 7315 | 0.85 | 6 | ||||
| SC14-M-1250 | 1250 | 1420 | 8720 | 0.85 | 6 | ||||
| SC14-M-1600 | 1600 | 1665 | 10555 | 0.85 | 6 | ||||
| SC14-M-2000 | 2000 | 2075 | 13005 | 0.7 | 6 | ||||
| SC14-M-2500 | 2500 | 2450 | 15445 | 0.7 | 6 | ||||
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