SG Three Phase Dry Type Isolation Transformer Manufacturer In China

SG 10kva-1000kva Three Phase Dry Type Isolation Step Down Transformer

The SG series three-phase dry type isolation transformer is a high-performance power solution engineered for AC 50 Hz–60 Hz circuits up to 660 V. Designed for industrial production lines, data centers, precision machine tools, medical equipment, and imported critical devices, it provides electrical isolation, stable voltage conversion, and superior noise suppression.

With a capacity range of 10 kVA to 1000 kVA, this transformer meets and exceeds international standards including IEC 439 and GB 5226, delivering dependable power where safety and efficiency are paramount.

Key Advantages

1. Dry Type Design for Safety & Low Maintenance

Natural Air Cooling (AN): Eliminates the need for oil, reducing fire risk and maintenance costs.
Flame-Retardant Materials: UL94 V-0 compliant, providing excellent fire resistance.

2. Electrical Isolation & Noise Suppression

Galvanic Isolation: Establishes a new neutral grounding system to eliminate common-mode interference.
Optional Shielding Layer: When grounded properly, effectively suppresses high-frequency EMI for sensitive equipment.

3. Flexible Voltage Conversion

Supports Δ-Δ, Δ-Y, or Y-Δ connections for step-down or step-up applications.
Custom input/output voltages and tap settings (±5 %) to match regional power requirements.

4. High Efficiency & Reliable Performance

Efficiency ≥95 % with waveform distortion <0.1 %.
Load regulation within ±1 % from no-load to full-load.
Vacuum-impregnated F/H-class insulation for long service life and exceptional thermal stability.

Main technical parameter

Dimensions with housing

Model	SG -kVA
Phase	3 Phase
Capacity	0.5~400 kVA (Can be customized)
Primary Voltage	110V/ 120V/ 208V/ 220V/ 230V/ 240V/ 380V/ 415V/ 480V (Can be customized)
Secondary Voltage	110V/ 120V/ 208V/ 220V/ 230V/ 240V/ 380V/ 415V/ 480V (Can be customized)
Winding Material	Aluminium/ Copper (optional)
Voltage Convert	Single phase to single phase, three phase to three phase, three phase to single phase
Frequency	50Hz / 60 Hz
Work Efficiency	≥95%
Insulation Resistance	≥5 MΩ
Electrical Strength	3000V AC/1 min
Noise	<35 – 65dB (1 meter)
Insulation Grade	H level
Wiring Mode	Dyn11
Cooling Mode	Dry type air cooling
Overload Capacity	Allow more than 1.2 times rated load to work for up to 4 hours
Temperature	-15℃~+40℃
Humidity	≤90%RH, without condensation

Product specifications

MODEL	Input voltage	Output voltage	Measurement(mm) LengthWidthHeight
SG-500VA	Default 660V 440V 380V 220V 208V 200V (customizable voltage)	Default 660V 440V 380V 220V 208V 200V (customizable voltage)	420330360
SG-10KVA			460350450
SG-15KVA			490390450
SG-20KVA			520430470
SG-25KVA			580460450
SG-30KVA			580460540
SG-50KVA			750480690
SG-80KVA			800500740
SG-100KVA			900550840

Applications

Data centers & IT infrastructure — clean, isolated power for servers and network gear.
Medical & laboratory equipment — imaging, diagnostics, test benches.
Industrial automation & CNC — motors, robots, control panels needing low-noise, isolated supply.
Renewables & power distribution — step-down and isolation for solar inverters, microgrids and local distribution.
Renewable Energy & Power Distribution – Step-down transformation for solar and wind integration.

Why Choose ZHENGXI

As a global transformer manufacturer with decades of engineering expertise, ZHENGXI provides:
ISO-Certified Production & CE Compliance for international markets.
Custom Engineering Services to meet unique voltage, frequency, and enclosure needs.
High-Grade Materials & Precision Winding using orthocyclic techniques and vacuum impregnation for unmatched durability.
Responsive Technical Support and rapid lead times to keep projects on schedule.

FAQs

1. What is the difference between a dry type transformer and an oil-filled transformer?
A dry type transformer uses air as the cooling medium, eliminating flammable oil. This design reduces fire risk, requires less maintenance, and is ideal for indoor or high-safety applications.

2. Can the SG series be customized for specific input/output voltages?
Yes. ZHENGXI offers full customization of input/output voltage levels, tap settings (±5 %), and connection groups (Δ-Δ, Δ-Y, Y-Δ) to meet regional or project-specific requirements.

3. Is the SG transformer suitable for sensitive electronic equipment?
Absolutely. With galvanic isolation, optional shielding layers, and <0.1 % waveform distortion, the SG series provides clean, stable power for servers, medical imaging systems, and precision laboratory instruments.

Need a quote or a project-specific drawing for an SG dry type transformer, an isolation transformer, or a 100kva transformer? Send your system voltage, connection preference and load profile — our engineers will size and quote quickly.