2.5 MVA and up to 11KV Class. Off Load Tap changing suitable for both Indoor & Outdoor applications with off circuit tap links arrangements.
Up to 11KV
IS 11171:1985 and IS 2026:1977 with latest amendments.
Transformers will be connected as per Vector Group reference DyN11 and other Vector Groups can be offered as per specific requirements.
PRIMARY: Generally terminals are brought out through side wall mounted porcelain/epoxy bushings to an air filled cable entry box by suitable copper or brass stud.
SECONDARY: Generally terminals are brought through side wall mounted porcelain/epoxy bushings to an air filled cable box by suitable copper or brass stud.
Max. 115˚C measured by resistance method with maximum daily ambient temperature as per is.
Off Circuit tappings, +5% to -5% in steps of 2.5% are provided on Primary/Secondary windings. Taps are provided on Fibre Glass Board inside the enclosure & changed manually by copper link by opening of the enclosure panel or inspection cover.
Class H/C/F
COLD ROLLED GRAIN ORIENTED high permeability silicon steel, with Low Loss Grade M4 or better, with fully mitred joints.
LV. & HV. Winding are done in a dust free zone. Rectangular copper strips/foils are used for LV. Winding while HV. Winding are of copper rectangular wire / strip both insulated with NOMEX insulation. This also prevent temperature rise even if wrapping is not possible due to small diameter.
The Transformer Coils are thoroughly dried in the drying oven & then completely sealed with an insulating varnish ( Class H or C) through Vacuum Pressure Impregnation Process. This VPI process fully penetrates & seals the coils into higher strength composite unit for complete environment protection, hence can be used in humid & chemically polluted atmosphere. Coils are then cured to develop bonding.
Ventilated with louvers & screens for Indoor installation or Non-Ventilated (totally enclosed for outdoor installation) made from MS sheet of suitable thickness.
Epoxy Powder Coated/Epoxy Enameled Paint.
All AEG DRY TYPE transformers undergo rigorous Quality control checks and are routine tested as per IS 11171:1985 & IS 2026:1977 in our fully equipped facility. Any other specific test required by the client can also be arranged on mutually agreed terms & conditions.
| Parameter | VPI | Cast Resin | Conductor insulation | Nomex | Non Woven Polyester |
|---|---|---|
| Thermal Rating | F H or C | F/B or F |
| Process | Conventional Winding Assembly | Cast mould Assembly |
| Impregnation | Vacuum pressure | Vacuum casting |
| Repair | Possible | Not possible |
| Cracking | Not possible | Possible |
| Overloading | High over load margin | No over load margin |
| Environment Concern | Can be easily disposed of | Large amount of resin to be disposed of |
| Safety | No toxic 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 |
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