Cast Resin Transformer – CRT
Dry Type Transformers (CRT – Cast Resin Type) are designed for safe and reliable operation in both indoor and outdoor environments without the use of insulating liquids. Ideal for installations where fire safety, low maintenance, and environmental protection are critical, these transformers are ground-mounted and built to withstand harsh operating conditions. With ratings up to 20 MVA and voltage class up to 33 kV, they are suitable for commercial complexes, industries, and infrastructure applications.
Assured Features
- Windings are electrically balanced to minimize axial short circuit forces.
- Coils are held rigidly in place between insulators clamped to the upper and lower core frames under high compression.
- Precise casting under vacuum, ensuring low partial discharge.
- Smooth surface finish and robust construction of MV & LV cast Coils.
- Adequate ducts between coils, discs for maximum air flow, and reduced hot spot temperature.
- Step-lap designed CRGO laminations for lower losses and excitation current.
Technical Specifications
| Duty, Type | Outdoor / Indoor Ground Mounted Type |
| Ratings | UPTO 20 MVA |
| Voltage Class | UPTO 33 kV |
| No of Phases | 3 Phase |
| Frequency; | 50/60 Hz |
| Vector Group | Dyn1 or Dyn5 or Dyn11 or any specific |
| Class of Insulation | F or H with Temp Rise of 90 or 115 Deg C or as per customer requirement |
| Tap Changer Type | Off Circuit Type or On Load Type |
| Tapping Range | + 2.5% X 2 for OFF CIRCUIT TAP CHANGER or + 2.5% X 2 & – 2.5% X 6 for ON LOAD TAP CHANGER or as per customer requirement |
| Winding Material | Aluminium Or Copper with multi paper covering |
| Applicable Standards | IS 11171, IEC 60726 |