SG Series Three-phase Dry-type Transformers for Laser Machines

Three-phase Dry-type Isolation Transformer

The SG series three-phase dry-type transformers not only provide voltage transformation in power systems, but also effectively isolate third harmonic interference from the power grid. This helps reduce equipment overheating and extend the service life of insulation materials, thereby enhancing equipment protection and operational reliability.

These transformers are especially suitable for imported equipment applications, such as:

  • 380V input → 220V output
  • 380V input → any required output voltage
  • 220V input → any required output voltage

The power capacity ranges from 1kVA to 1000kVA. Both SG and DG series dry-type isolation transformers are widely used in various single-phase and three-phase power supply applications with AC 50–60Hz and input/output voltages not exceeding 500V. All product specifications, including input and output voltage levels, connection groups, tap changer positions, winding capacity distribution, secondary winding configurations, and enclosure requirements, can be custom-designed and manufactured according to customer requirements.

Product Features

  • Scientifically and rationally designed, with the voltage regulation rate controlled within 1%–1.5%.

  • Manufactured with high-quality brand-new silicon steel laminations, effectively reducing iron loss and improving operating efficiency.

  • Made with high-temperature-resistant premium conductor materials, minimizing internal losses and significantly enhancing performance.

  • Equipped with an H-class insulation system and high-temperature-resistant insulating materials, improving dielectric strength and insulation level while extending service life.

  • High-efficiency design, with overall efficiency reaching over 98%.

  • Features a patented appearance design with an aesthetic and modern look, high power density, compact size, and efficient space utilization.

  • Structurally, the products are available in open type and enclosed (protected) type. 

Technical Data

Model SG series
Phase 3-phase
Specfication 1KVA-3000KVA
Input Voltage 3φ 220V/380V/415V/460V.399V/360V
Output Voltage Various voltage ratings can be customized according to customer requirements
Output Voltage Accuracy  ±1%
Voltage Regulation ≤1.5%
Output Waveform Distortion No distortion (compared with the input waveform)
Insulation Class / IP Rating Insulation class: F / H / HC available (standard configuration: H class); IP rating: IP00, IP20, etc.
Operating Efficiency ≥98%
Applicable Frequency 50 / 60 Hz
Connection Method Y / △
Overload Capability Capable of operating continuously at 1.2 times the rated load for 4 hours (suitable for long-term full-load operation)
Noise level ≤35 dB (within 1 meter)
Temperature Rise ≤60 ℃
Insulation Resistance ≥150 MΩ
Dielectric Strength 3000 VAC / 1 min
Design Service Life 30 years
Operating Environment Conditions Ambient temperature: -20 ℃ to +45 ℃; Relative humidity: ≤95% RH (non-condensing)
Installation Environment Requirements Free of corrosive gases and conductive dust
Safety Standards Compliant with VDE 0550, IEC 439, JB 5555, GB 226 and other international and national standards
Cooling Method AF

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