75Kva Three Phase Isolation Transformer Power Step Down Dry Type 480v 270v Copper Winding
Summarization
Engineered for demanding environments, our 75 kVA three-phase dry-type isolation transformer offers reliable voltage conversion from 480V to 270V with H-class insulation (180°C rating), delivering superior heat resistance and durability. Ideal for industrial, commercial, and mission-critical applications, this transformer combines robust isolation with advanced safety features.
Main data
| Basics | Model | SG75KVA |
| Phase | 3 phase |
| Capacity | 75 kVA |
| Weight of Copper Wire Transformer | 310kg |
| Technical Parameters | Primary Voltage | 480V Or customized |
| Secondary Voltage | 270V Or customized |
| Voltage Convert | Three phase to three phase |
| Frequency | 50Hz / 60 Hz |
| Winding Material | Aluminium/Copper wire (Optional) |
| Work Efficiency | ≥98% |
| Insulation Resistance | ≥50 MΩ |
| Electrical Strength | 3000V AC/1 min |
| Noise | <35-65dB (1 meter) |
| Insulation Grade | H level |
| Wiring Mode | D/Yd |
| Cooling Mode | Dry type air cooling |
| Certificate | CE, ISO |
| Warranty | 24 months |
| Working Environment | Temperature | -15℃~+40℃ |
| Humidity | ≤90%RH, without condensation |
| Altitude | <1000m, non corrosive gas and conductive dust |
Key Features & Benefits
- H-Class Insulation: Rated for 180°C, providing exceptional thermal stability and extended lifespan in high-temperature environments. Epoxy-encapsulated windings resist moisture, dust, and contaminants, ensuring reliable operation in harsh conditions.
- Electrical Isolation: Galvanic separation between 480V primary and 270V secondary circuits eliminates ground loops, suppresses electrical noise, and protects sensitive equipment from voltage surges. Complies with ANSI/IEEE standards for isolation and surge protection.
- Oil-Free Dry-Type Design: Eliminates fire hazards and environmental risks associated with liquid-filled units. Low-maintenance design reduces operational costs and meets strict safety regulations for indoor/outdoor use (NEMA 3R enclosure optional).
- Efficient Cooling: Natural air cooling (AN) ensures continuous full-load operation. Optional forced air cooling (AF) increases capacity by 30%, maintaining winding temperatures well below H-class limits for reliable performance under heavy loads.
- Precision Engineering: Copper windings and grain-oriented silicon steel core deliver ±2% voltage regulation and >95% efficiency. H-class insulation enables compact design without compromising on power density.
Drawing
Specification
Model
(kva) | Primary Voltage | Secondary Voltage | Coupling group tab | Shape dimension | Mounting dimension | | K*J | The box dimension |
| Bmax | Dmax±5 | Emax | A | C±5 | Bmax | Dmax±5 | Emax |
| SG-10KVA | 660
400
380
200 | 380
220
110
36 | Yyn0
Y/d
D/y
D/d | 360 | 180 | 305 | 215 | 140 | 10*20 | 450 | 360 | 480 |
| SG-15KVA | 360 | 200 | 335 | 215 | 155 | 10*20 | 450 | 360 | 480 |
| SG-20KVA | 420 | 210 | 350 | 250 | 170 | 10*20 | 490 | 400 | 540 |
| SG-30KVA | 420 | 230 | 380 | 250 | 190 | 10*20 | 490 | 400 | 540 |
| SG-50KVA | 680 | 350 | 550 | 420 | 220 | 10*20 | 800 | 510 | 840 |
| SG-80KVA | 750 | 400 | 620 | 480 | 250 | 10*20 | 850 | 510 | 840 |
| SG-100KVA | 780 | 420 | 650 | 500 | 250 | 10*20 | 900 | 550 | 890 |
| SG-300KVA | 180 | 95 | 185 | 100 | 75 | 6*14 | | | |
| SG-500KVA | 180 | 95 | 185 | 100 | 75 | 6*14 | | | |
| SG-1000KVA | 180 | 110 | 185 | 100 | 90 | 6*14 | | | |
| SG-2000KVA | 230 | 125 | 205 | 130 | 100 | 9*16 | | | |
| SG-3000KVA | 240 | 145 | 215 | 130 | 120 | 9*16 | | | |
| SG-4000KVA | 240 | 155 | 235 | 130 | 130 | 9*16 | | | |
| SG-5000KVA | 320 | 160 | 255 | 180 | 115 | 10*20 | 400 | 330 | 480 |
| SG-6000KVA | 300 | 165 | 280 | 180 | 140 | 10*20 | 400 | 330 | 480 |
Application
The three phase voltage stabilizer can be applied to large type electromechanical equipment, metal processing equipment, production line, construction device , elevator, medical equipment, equipment of light and textile industry, air-condition, TV set, household appliance and lighting used for industry, agriculture, traffic, military, railroad, scientific culture, etc, where need voltage stabilization.
Production process
FAQ
1. Q: Can I have a sample order?
A: Yes, we welcome sample order to test and check quality.
2. Q: What is the lead time?
A: Mass production time 15-25 days.
3. Q: How long is the warranty?
A: 24 monthes from B/L. If there are any accessory problems,just provide the photos of damaged accessory,then we will provide free service. According to the number of products,we will provide easily damaged accessories for free. we also can provide technical support if you need.
4. Q: Is OEM/ODM available?
A: Yes,it is! We are manufacturer with our own R&D team, we can customize products according to customer's drawing or requirements.
Customized services:
a. Customized color and special function.
b. Customized box.
c. Print customer's logo.
d. Your other ideas about product, we can help you design and put them into production. The above customized services must be confirmed before production.
5. Q: How to control the products quality?
A: Our company owns the core technology ,all kinds of products hold CE certificate. We have professional engineers. Workers are strictly required to make products according to the drawings. Each process has technical instructors.The QC supervisors will regularly inspect the production. We will do products performance tests during production, and comprehensive quality tests when the products is completed.
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75Kva Three Phase Isolation Transformer Power Step Down Dry Type 480v 270v Copper Winding Images
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