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Eaton’s Cooper Power series Dual Source VFI (DS-VFI) transformer provides automatic source recovery, built-in overcurrent protection and grid automation schemes for the modern electrical distribution system. Designed for both main-main applications and loop-feed applications, the DS-VFI transformer combines state-of-the-art switchgear controls and automation with proven high-efficiency liquid-filled transformer technology into a single assembly. The solution enables complete medium-to low-voltage distribution protection and automatic outage restoration in a compact, cost-effective package.
Designed with flexibility for multiple applications, the DS-VFI transformer combines state-of-the-art switchgear controls and automation with proven high-efficiency liquid-filled transformer technology in a single assembly, enabling complete medium-to low-voltage distribution protection and automation in a compact, cost-effective package.
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| Available in kVA range | 500 kVA to 4,000 kVA |
| Primary configuration | Delta or wye connected |
Primary voltage |
2400 V - 34,500 V |
| Secondary voltage | 208 Y/120 V to 14,400 V |
| Basic Impulse Level (BIL) | Up to 150 kV |
| Interrupt rating | 12.5 kA at 25/35 kV, up to 16 kA at 15 kV |
| ANSI/IEEE | C57.12.00 and C57.12.36 |
| CSA | C88-M90 |
NEMA (sound level) |
NEMA TR-1 |
| Third-party approval/recognition | FM Global (Indoor and Outdoor), UL/cUL available for most ratings |
Tamper resistance |
3-point latching and padlock system |
| NEMA rating | NEMA 3R |
Material |
Mild or stainless steel (304L) |
| Enclosure environment | Indoor and outdoor |
| Main insulating medium | Dielectric fluid |
| Termination chambers | Air insulated |
Distribution transformer |
Three-phase substation |
Install location |
Indoor or outdoor |
Power direction |
Step-down and Step-up |
Overcurrent protection |
Dual vacuum fault interrupter (VFIs) |
Motor operator |
Remote control/reset of VFIs |
Protective relay |
Eaton ETR-5000 relay |
Automation controller (optional) |
Eaton SMP Gateway |
ETR-5000 differential relay |
Space heater with thermostat |
Manual/automatic selector switch |
CT/PT test switches |
VFI open/closed/tripped status lights |
VFI 86 lockout indicators and lockout reset switches |
Integral 120 Vac CPT source power |
Local motor control interface |
Gauges and alarm devices wired to relay (as requested) |
24 VDC battery backup system |
A/B preferred source selector switch
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Learn about the fundamentals of medium-voltage transformers
In the wake of a storm or disaster, Eaton understands that safety and speed of response is everything. You can rely on Eaton Care teams to plan, protect and connect.
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