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| VENTILATED DRY TYPE TRANSFORMER |
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Applicable Standards
- IEC (International Electro technical Commission)
- IS (Indian Standard)
Introduction
Kotsons Pvt. Ltd. in collaboration with E. I. DuPont, U.S.A. has developed Ventilated Dry Type transformers in India with a DuPont ReliatraN® branded solution.
ReliatraN® Brand Transformers are manufactured with UL® Certified Insulation Materials and Systems, by a network of ISO 9000 Certified Manufacturers worldwide, meeting the highest of International Standards for Quality, Design, Construction and Performance.
Kotsons Pvt. Ltd. is the first and only Operating Licensed Manufacturer of DuPont's ReliatraN® Brand Transformers in India.
Advantages of ReliatraN ® Transformers
- High level of Safety.
- No flammable liquids
- No pollution from leaks solution.
- No toxic off-gasses
- Can be placed Close to the load
- More efficient
- Increased emergency Overload capability
- Improved Reliability
- Low Noise and Low Maintenance
- Easy to repair (open coils)
- Designed to be free of Partial Discharge
| Parameters |
VDT with Nomex® |
Cast Resin |
| Conductor Insulation |
Nomex® |
Non woven polyester |
| Thermal Rating |
F or H / C |
F/B or F |
| Process |
Conventional Winding Assembly |
Cast Mold Assembly |
| Impregnation |
Vacuum Pressure Impregnation |
Vacuum Casting |
| Repair |
Possible |
Not Possible |
| Cracking |
Not possible |
Possible |
| Overloading |
High Overload margin |
No over load margin |
| Environment concern |
Can be easily disposed of |
Large amount of resin to be disposed of |
| Safety |
No toxic off gases, no melting |
Emission of toxic gases |
| Partial Discharge |
Free of Partial Discharge |
Partial Discharge is possible due to high probability of bubbles formation during casting. |
Description
Kotsons manufactures Ventilated Dry Type transformer ranging from 40 KVA to 5000 KVA with voltage class of 33 KV. These transformers are fitted in Enclosure confirming to IP 21 to IP 33 for Indoor location and IP 45 for out door location. Kotsons Ventilated Dry Type Transformer are totally maintenance free and safe from fire as material used are metals, ceramics, fiberglass and resin. It is environment friendly as there is no oil, hence handling becomes easier and there are no chances of spillages and leakages and there is minimal non toxic smoke in case of fire.
Kotsons offers Ventilated Dry Type Transformers with Class H / C insulation which can bear heat upto 180 / 220 Deg C and can be used in humid and chemically polluted atmosphere.
Kotsons can supply Indoor/Outdoor, 3 phase, 50/60 Hz, Resin Impregnated, AN/FA cooled, step up/step down, double wound with Cu conductor transformer from 40 KVA to 5000 KVA upto 33 KV Class with H / C Class Insulation and designed to withstand Short Circuit, & Impulse Test in accordance to IEC / IS.
Process & Core :
Core structure is of nonaging, Cold Rolled Grain Oriented, high permeability silicon steel. All core laminations are free of burr and staked without gaps The core assembly is painted with a protective paint to protect against corrosion.
Winding :
LV & HV Windings are done in dust free air conditioned winding shops. Rectangular copper strips are used for LV winding insulated with Nomex® while HV winding are of copper wire insulated with Nomex® or suitable material for temperature rise if wrapping is not possible due to small diameter.
VPI:
The Transformer coils are thoroughly dried in an PLC controlled oven and the coils are then completely sealed with an insulating Varnish / Resin (Class H/C) through an vacuum pressure impregnation process. Kotsons is having a state of art PLC controlled VPI (Vacuum Pressure Impregnation) Plant. The VPI process fully penetrates and seals the coils into a high strength composite unit for complete environment protection, hence can be used in humid and chemically polluted atmosphere. Coils are then cured to develop bonding.
Testing :
After the Core- Coil assembly. All transformers are tested for routine test. Kotsons has in house facilities for conducting all routine tests as per IEC & IS. Kotsons is equipped with adequate digital readout measuring devices wherever required and the digital sampling techniques with computer calculations. Precision digital meters such as digital power analyser, WT -130 of Yokogawa make are used for measuring of load losses, Impedance Voltage, No load losses, and no load currents. KPL is having in house Partial Discharge (PD) testing facility.
Warranty :
KPL VDT Transformer are guaranteed for satisfactorily performance for a period of 5 years* from the date of dispatch. Any part found defective during this period, as a consequence of bad design, manufacturing or workmanship should be repaired, free of cost, by us within mutually agreed schedule.
* Warrantee for 5 Years on active part only.
Environmental Impact Operational Aspects
- Transformers insulated with NOMEX® brand materials are extremely safe, even when exposed to fire.
- High flame resistance, and low smoke and no toxic off-gasses.
- Class H & C ventilated dry type transformers can be built smaller, reducing the footprint to the environment, conserving space.
- Insulation is friendly to use during manufacturing - no skin irritants or surface chemicals.
End-of-Life Aspects
- NOMEX® insulation can be easily disposed of by incineration or burial, since it is inert to the environment.
- NOMEX® insulated VDT transformers have low volumes of insulation, eliminating the burden of disposal of large amounts of resin.
Quality :
KOTSONS PVT. LTD., is certified for ISO 9001:2000 by DET NORSKE VERITAS, B.V., NETHERLANDS. Kotsons has set up a complete quality management system to offer the best customer satisfaction. Each and every Ventilated Dry Type Transformer is identified with ReliatraN ® identification labels.
Specification for KST (Kotsons Standard Transformer)
Kotsons makes Indoor/Outdoor, 3 phase, 50/60 Hz, Resin Impregnated, AN/FA cooled, step up/step down, double wound with Cu conductor transformer from 40 KVA to 5000 KVA upto 33 KV Class with H / C Class Insulation and designed to withstand Short Circuit, & Impulse Test in accordance to IEC / IS.
| Sl.No. |
Rating |
No Load Loss (Watts) |
Load Loss (Watts) |
Total Loss(Watts) |
Impedance (%) |
Outline Dimension (mm) |
Total Weight (Kg) |
| KVA |
KV |
L |
W |
H |
| 1 |
630 |
11/0.433 |
1725 |
6920 |
8645 |
5 |
1850 |
1200 |
1750 |
2520 |
| 2 |
800 |
11/0.433 |
1920 |
7880 |
9800 |
5 |
1900 |
1200 |
1850 |
2855 |
| 3 |
1000 |
11/0.433 |
2235 |
10145 |
12380 |
5 |
1950 |
1250 |
1950 |
3125 |
| 4 |
1250 |
11/0.433 |
2630 |
12600 |
15230 |
5 |
1950 |
1250 |
2100 |
3520 |
| 5 |
1600 |
11/0.433 |
3010 |
14765 |
17775 |
6.25 |
2050 |
1350 |
2250 |
4230 |
| 6 |
2000 |
11/0.433 |
3540 |
18375 |
21915 |
6.25 |
2150 |
1450 |
2450 |
4940 |
| 7 |
2500 |
11/0.433 |
4305 |
21260 |
25565 |
6.25 |
2250 |
1550 |
2550 |
5855 |
Note :
- The dimensions and weights shown above apply to a typical range of KST (Kotsons standard transformers) design to the specification IS : 2026. As all transformers are usually design and built to customers specification their exact dimensions and weights can vary.
- Due to improvements continuously taking place in design, the details given here may vary marginally irrespective of Length, Width, Height and Total Weight . However the variations will be within permissible tolerance limits as per IS 2026 latest.
| ITEM No. |
DESCRIPTION |
STANDARD |
OPTIONAL |
| 1. |
H.V. TERMINAL BUSBAR |
Yes |
No |
| 2. |
L.V. TERMINAL BUSBAR |
Yes |
No |
| 3. |
L.V. SEPERATE NEUTRAL EARTHING BUSHING |
No |
Yes |
| 4. |
SEPERATOR NEUTRAL EARTH BUSBAR |
No |
Yes |
| 5. |
OFF CIRCUIT TAPPING LINK BOARD |
Yes |
No |
| 6. |
TAP LINK POSITION PLATE |
Yes |
No |
| 7. |
ACCESS DOORS/WINDOWS FOR TAP CHANGING LINKS |
Yes |
No |
| 8. |
VENTILATION LOUVERS |
Yes |
No |
| 9. |
RAIN WATER GUARD |
Yes |
No |
| 10. |
RATING AND DIAGRAM PLATE |
Yes |
No |
| 11. |
LIFTING LUGS FOR TOP COVER & COMPLETE TRANSFORMER LIFTING |
Yes |
No |
| 12. |
LIFTING HOLES FOR CORE-COIL ASSY. LIFTING |
Yes |
No |
| 13. |
ENCLOSURE (DEGREE OF PROTACTION IP-21/23) |
Yes |
No |
| 14. |
MARSHLING BO-- |
Yes |
No |
| 15. |
PHASE C.T. |
Yes |
No |
| 16. |
WINDING TEMPERATURE INDICATOR |
Yes |
No |
| 17. |
SPACE HEATER |
No |
Yes |
| 18. |
DETACHABLE H.V. CABLE GLAND PLATE WITH 1 KNOCKOUT |
Yes |
No |
| 19. |
H.V. CABLE GLAND |
No |
Yes |
| 20. |
H.V. CABLE LUG WITH INSIDE KNURLING |
No |
Yes |
| 21. |
H.T. CABLE CLAMP |
Yes |
No |
| 22. |
SURGE ARRESTER |
No |
Yes |
| 23. |
SURGE ARRESTER GROUNDING BUSHING |
No |
Yes |
| 24. |
SURGE ARRESTER GROUNDING BUSBAR |
No |
Yes |
| 25. |
DETACHABLE L.V. CABLE GLAND PLATE WITH REQD. KNOCKOUTS |
Yes |
No |
| 26. |
L.V. CABLE GLAND |
No |
Yes |
| 27. |
L.V. CABLE LUG WITH INSIDE KNURLING |
No |
Yes |
| 28. |
L.T. CABLE CLAMP |
Yes |
No |
| 29. |
SKID UNDER BASE WITH HAULAGE HOLES |
Yes |
No |
| 30. |
BI – DIRECTIONAL FLAT ROLLERS |
Yes |
No |
| 31. |
BODY EARTHING TERMINALS |
Yes |
No |
| 32. |
PHASE IDENTIFICATION PLATES |
Yes |
No |
| 33. |
DANGER PLATES |
Yes |
No |
| 34. |
H.V. CABLE BO-- |
No |
Yes |
| 35. |
L.V. CABLE BO-- |
No |
Yes |
| 36. |
L.V. BUSDUCT BO-- |
No |
Yes |
| 37. |
Fans |
No |
Yes |
| 38. |
OLTC, AVR, RTCC |
No |
Yes |
NOTE:- OPTIONAL FEATURES ARE AVAILABLE ON BUYER'S REQUEST & AT EXTRA COST.
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