Attribute Name: Values
Transformer Type: Pad-Mounted
Capacity Range: 45 kVA – 12 MVA
Voltage Class: 2.4kV – 46kV
Insulating Fluid: Mineral Oil, FR3™ Fluid
Applications: Utility, Data Centers, Solar Farms
Certifications: ISO 9001, UL Listed, DOE Compliant
Special Features: HDC Data Center, Solar PV Ready
Daqo Power Systems delivers high-quality, reliable pad-mounted transformers designed for utility and commercial power distribution applications. Our ISO 9001 compliant manufacturing process ensures exceptional quality control from design through testing.
200A and 600A bushing options available in dead-front and live-front configurations, including 200A bushing wells (15-35kV) and 600A integral bushings.
Three-legged, step-lap mitered cores manufactured with burr-free, grain-oriented silicon steel. Five-legged wound cores are available for special applications.
Quasi-elliptical coil configuration with diamond pattern epoxy-coated paper insulation. Heat-cured under hydraulic pressure for maximum short-circuit strength.
Vacuum processing ensures complete moisture removal and optimal fluid penetration. Choose between mineral oil or environmentally friendly FR3™ fluid.
Hardened Data Center (HDC) transformers with enhanced surge protection and reliability. Proven performance with over 2,000,000 operational hours without failure.
Custom-designed for solar applications with FR3™ fluid. Reduced core losses, improved efficiency, and a smaller footprint for optimal ROI.
Meets DOE 2016 efficiency standards and NEC requirements for less-flammable fluids. FR3™ fluid is biodegradable, non-toxic, and FM Approved.
Rigorous quality control throughout manufacturing
Compliance with national electrical codes
Eco-friendly FR3™ fluid available
Tailored designs for specific applications
Table 1. Product Scope
| Type | Three Phase， 50 or 60 Hz， 65℃ Rise (55℃，55/65℃)，65/75℃，75℃ |
| Fluid Type | Mineral oil or EnvirotempTM FR3TM fluid |
| Coil Configuration | 2-winding or 4-winding or 3-winding (Low-High-Low), 3-winding (Low-Low-High) |
| Size | 45 – 12,000 kVA |
| Primary Voltage | 2,400 – 46,000 V |
| Secondary Voltage | 208Y/120 V to 14,400 V |
| Specialty Designs | Inverter/Rectifier Bridge |
| K-Factor (up to K-19) | |
| UL® Listed & Labeled and Classified | |
| Factory Mutual (FM) Approved® | |
| Solar/Wind Designs | |
| Differential Protection | |
| Seismic Applications (including OSHPD) | |
| Hardened Data Center |
Table 2.DOE Efficiency & Audible Sound Levels
| Volume（kVA） | DOE Efficiency | Sound（dB） |
| 75 | 99.03% | 54 |
| 112.5 | 99.11% | 55 |
| 150 | 99.16% | 55 |
| 225 | 99.23% | 55 |
| 300 | 99.27% | 55 |
| 500 | 99.35% | 56 |
| 750 | 99.40% | 57 |
| 1,000 | 99.43% | 58 |
| 1,250 | 99.45% | 59 |
| 1,500 | 99.48% | 60 |
| 2,000 | 99.51% | 61 |
| 2,500 | 99.53% | 62 |
| 3,000 | Customized | 63 |
| 3,001-4,000 | Customized | 64 |
| 4,000-5,001 | Customized | 65 |
| 5,001-6,000 | Customized | 66 |
| 6,001-7,500 | Customized | 67 |
| 7,501-12,000 | Customized | 68 |
Table 3. Insulation Test Levels
| KV Class | Induced Test 180 or 400 Hz 7200 Cycle | kV BIL | Applied Test 60 Hz (kV) |
| Distribution | |||
| 1.2 | TWICE RATED VOLTAGE | 30 | 10 |
| 2.5 | 45 | 15 | |
| 5 | 60 | 19 | |
| 8.7 | 75 | 26 | |
| 15 | 95 | 34 | |
| 25(grd Y Only) | 125 | 40 | |
| 25 | 150 | 50 | |
| 34.5(grd Y Only) | 125 | 40 | |
| 34.5 | 150 | 70 | |
| 46 | 200 | 95 |
Contact our engineering team to discuss your specific pad-mounted transformer requirements and receive a customized solution.
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