Dry type transformers are those transformers that use air as cooling and dielectric medium instead of conventional technology of transformers which uses mineral oil as a cooling and dielectric medium.
Vacuum Pressure Impregnated (V.P.I.) Dry Type Distribution Transformers
V.P.I. is a process which is a step above the conventional vacuum system. V.P.I. includes pressure in addition to vacuum, thus assuring good penetration of the varnish in the coil. The result is improved mechanical strength and electrical properties. These transformers are used in installations within the building premises,crowded and urban areas,overloaded feeders, near to the load centre or even outdoors where there is oil theft.
We at Shri Ram Group Of Industries utilise a state of art vacuum impregnating system to manufacture Dry type transformers upto 3 mVA 33kV Class.
TECHNICAL SPECIFICATIONS |
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| Rating | Upto 3mVA | |
| Duty Type | Outdoor/Indoor, Ground Mounted Type& Pole Mounted Type | |
| Voltage Class | Upto 33Kv | |
| No Of Phases | 3 phase | |
| Frequency | 50/60 Hz | |
| Vector Group | Dyn1 or Dyn5 or Drn11 or any specific | |
| Class Of Insulation | F , H Or C class as required | |
| Insulating Material | Nomex, Silicone Varnish, Fiber Glass, Glass Epoxy | |
| Class Of Insulation | Class A | |
| Tap Changer | Off Circuit or On Load | |
| Temperature Rise | 65.C to 115.C above ambient temperature of 50.C by resistance method or as per customer’s requirement | |
| Tap Changer | Off Circuit or On Load | |
| Tapping Range | +-2.5% X 2 for OCTC or +-2.5% X 2 & -2.5% X6 for OLTC as per customer requirement | |
| Winding Material | Aluminum Or Copper with multi paper NOMEX covering | |
| Applicable Standards | IS 11171,IEC 60726 | |
| Enclosure Painting | Powder Coated with RAL 7032 Shade or as per customer requirement | |
| Tank | Hermetically Sealed, Corrugated Type or Conventional Air cooled Type | |
SALIENT FEATURES OF SRI ® MAKE V.P.I. DRY TYPE DISTRIBUTION TRANSFORMERS |
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 Pioneer and one of the biggest vendor in India
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Nomex© engineered Dry Type Transformer with an overload withstanding capability of 140%
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Environment Friendly
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Non Flammable, Fire Resistant, Maintenance Free, Repairable at site
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Polyester resin or thixotropic epoxy resin or silicon varnish impregnation as per application
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“H’ class ducts between coils and discs to maximize air flow and reduce hot spot temperature
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Pre composed Insulation material for minimal moisture absorption
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Custom made to meet each and every requirement of customers conforming to National & International Standards
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Designed by experienced expert engineers using most modern software
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Average Delivery Time: 30-45 Days
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Facility to make 100Nos Transformers per month
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STANDARD FITTINGS |
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| H.V. Cable Box |
L.V Cable Box with Bus bar or Bus duct |
Off Circuit Tap Links |
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| Under carriage with four bi-directional Rollers |
Earthing terminals |
Rating diagram plate |
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| Lifting lugs for complete Transformer |
Enclosure with panels |
Canopy |
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| Base Channel-2 Nos. |
Separate Neutral bushing on LV side |
Paint: Powder Coated with RAL 7032 Shade |
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| Hinged Windows for inspection of core and windings |
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OPTIONAL FITTINGS |
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| RTD with A/T contact |
Marshalling box with control wiring |
On Load Tap Changer with RTCC Panel and AVR |
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| Forced cooling arrangement |
Neutral Current Transformer |
Space heaters for core & windings. |
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