High-Performance Cast Resin & VPI Dry-Type Transformers
Volta Transformers designs and manufactures premium-grade Dry-Type Transformers tailored for demanding commercial, industrial, and utility environments where fire safety, environmental cleanliness, and low maintenance are critical operating requirements.
Unlike traditional oil-filled units, our dry-type transformers utilize advanced air-cooling systems along with high-dielectric resin encapsulation or vacuum pressure impregnation (VPI). This eliminates flammable liquid insulation, making them the safest power distribution solution for indoor installations, populated high-rise buildings, underground subways, hospitals, and eco-sensitive industrial zones.
Dry-Type Transformer Specifications
Engineered to international electrotechnical standards for seamless integration into global power grids.
| Technical Attribute | Standard Specifications & Range |
|---|---|
| Power Capacity Rating | 100 KVA up to 4 MVA (Custom engineering available for special duty) |
| High Voltage (HV) Class | 1.1 kV, 2.2 kV, 3.3 kV, 6.6 kV, 6.9 kV, 11 kV, 12.47 kV, 13.2 kV, 13.8 kV, 15 kV, 22 kV, 25 kV, 33 kV, 34.5 kV |
| Low Voltage (LV) Class | 380 V, 400 V, 415 V, 433 V, 440 V, 600 V, 690 V (Custom secondary taps available) |
| Winding Insulation Class | Class F (155°C) / Class H (180°C) with low thermal temperature rise limits |
| Cooling System | Air Natural (AN) / Air Natural Air Forced (ANAF) with automatic temperature control |
| Technology Options | Cast Resin Dry Type (CRT) / Vacuum Pressure Impregnated (VPI) |
| Enclosure Protection Class | IP00 (Unenclosed), IP20, IP21, IP23, IP54 (Indoor & Outdoor protective enclosures) |
| Tap Changer Mechanism | Off-Circuit Tap Changer (OCTC) / On-Load Tap Changer (OLTC) |
| International Compliance | IEC 60076-11, IS 11171, IEEE C57.12.01, ISO 9001:2015 Quality Management |
Why Overseas Procurement Teams Choose Volta
Robust construction and cutting-edge thermal management designed for long-term operational reliability.
Superior Fire Safety
Manufactured with flame-retardant and self-extinguishing insulation materials. Eliminates fire hazards and explosive risks associated with oil-immersed transformers.
Low Maintenance Costs
No oil testing, gas analysis, or liquid purification required. Reduces operational maintenance overhead and minimizes unplanned facility downtime.
Eco-Friendly & Clean
100% free of liquid coolants and toxic chemicals. Eliminates soil contamination and groundwater pollution risks, supporting sustainable LEED-certified buildings.
High Short-Circuit Resistance
Engineered with high mechanical strength to withstand severe electrical stresses, dynamic short-circuit forces, and frequent overload conditions.
Compact Space-Saving Footprint
Designed for installation in space-restricted environments such as basement electrical rooms, compact sub-stations, and high-density commercial complexes.
Advanced Thermal Protection
Equipped with integrated PT100 temperature sensors and micro-processor temperature controllers to continuously monitor winding health and control forced-air cooling fans.
Industrial & Commercial Applications
Our dry-type transformers are deployed globally across diverse sectors requiring strict fire codes and high power stability:
Rigorous Factory Testing & Quality Control
Every Volta Dry-Type Transformer undergoes comprehensive routine and type testing at our modern manufacturing plant in Vadodara, India, prior to export dispatch. Tests are performed strictly in compliance with IEC 60076-11 and IS 11171 standards:
- Winding Resistance Measurement on all taps for balanced phases.
- Voltage Ratio & Vector Group Verification for precise turn accuracy.
- Applied Voltage & Induced Overvoltage Withstand Tests for dielectric integrity.
- Partial Discharge Measurement (guaranteed < 10 pC on Cast Resin units).
- No-Load Loss & Load Loss Measurements at rated current and frequency.
- Temperature Rise Test validation under maximum load cycles.
Require Technical Drawings or a Custom Quote?
Our engineering team provides full technical assistance, customized secondary voltages, and factory acceptance test reports tailored to your procurement specifications.
Inquire Now