• Reduced cost on civil installation works and fire protection systems.
  • Safety for people and property.
  • Excellent resistance to short circuit currents.
  • Environment friendly.
  • Easy Installation.
  • Maintenance and Pollution free solution.
  • Excellent capacity to support overloads.
  • Long lasting due to low thermal and dielectric heating.
  • No fire hazard.

    Vacuum Pressure Impregnated Transformer (VPI) is a process which is a step above the conventional vacuum system. VPI 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.

    This type of transformer is made with minimum flammable material as insulation of windings. The primary and secondary winding with core are laced safely within a vacuum protective box. Moisture ingress protection is high and it never gets affected by moisture. Tirupati Transformers Pvt Ltd is a reputed brand of Vpi transformer manufacturers in Delhi NCR.

    For dry type transformers there are two types of cooling methods:

    • Air Natural (AN)
    • Air Forced (AF)

    The main features of insulation are to provide dielectric strength and to be able to withstand certain thermal limits.

    The insulation class could be F or H.

    • 1800 C for class H insulation
    • 1550 for class F insulation

  • Fittings and Accessories

    • V Cable Box
    • Under carriage with four bi-directional Rollers
    • Lifting lugs for complete Transformer
    • Hinged windows for inspection of core and windings
    • LV cable box with bus bar or bus duct
    • Earthing terminals
    • Enclosure with panels
    • Separate neutral bushing on LV side
    • Off circuit tap links
    • Rating diagram plate
    • Canopy

    Optional Fittings

    • Forced cooling arrangement
    • Marshalling box with control wiring
    • Neutral current Transformer
    • On load tap changer with RTCC panel and AVR.


    Brand Tirupati Transformers
    RATINGS Upto 3 MVA
    Voltage class Upto 33 KV
    Winding Material Copper & Aluminium
    Applicable Standards IS 11171, IEC60726
    Duty Type Outdoor/Indoor, Ground Mounted Type & Pole Mounted Type
    No of Phases Three Phase
    Frequency 50 HZ
    Vector Group Drn11
    Winding material Copper / Aluminium
    Tap Changer Off circuit or On load Tap Changers as per customer spec.
    Class of Insulation F, H class as required and Class A
    Insulation Material Nomex, Silicon Varnish, Fiber Glass, Glass Epoxy
    Temperature Rise 650 C to 1150 C above ambient temperature of 500C by resistance method or as per customer’s requirement
    Enclosure Painting Powder Coated with RAL 7032 shade as per customer requirement.

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