DRY TYPE TRANSFORMERS
Dry Type (Crt)
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At TELAWNE casting method of these transformers is obtained with the combined action of vacuum and temperature. The casting method makes it possible to assure void-free epoxy penetration of both the inner layer and between turn insulation.These Transformers are specifically needed in distribution network for feeding basements or stilts of high-rise buildings, hotels, Malls, stadium, air ports, chemical & refinery plants. Following are the dimensional, weight & quantity details along with standard losses for conventional 11KV, Dry Type (VPI) Transformer (off circuit Type).
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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 |
| 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 OFF LOAD TAP CHANGER or as per customer requirement |
| Winding Material | Aluminium Or Copper with multi paper covering |
| Applicable Standards | IS 11171, IEC 60726 |