Ground/Pad Mounted Transformers

Pad-mounted transformers are generally mounted on the ground for underground distribution networks. These types of transformers are generally used for urban and rural residential, commercial and industrial loads.  These units are generally equipped with cable boxes or compartments for terminating the cables on HV and LV bushing terminals.

Three pre-engineered arrangements are available, determined by the customer requirement and standard:

  • Cable boxes with HV and LV terminals either at opposite sides of the tank or on the lid.
  • Compartments with HV and LV terminals on same side of the tank comply with ANSI / IEEE standard. HV side is dead or live front which is arranged either for loop or radial feed.         

Utec’s Pad Mounted Transformers are oil immersed, generally hermetically sealed type. The tank is designed to accommodate expansion of oil during loading through the use of corrugated steel sheets. Sealed type tanks with detachable radiators  having gas space which is normally filled with Nitrogen on top of oil  or free breathing type having oil conservator can also be offered as per customer requirement.

The windings are generally made up of copper. However, Aluminum windings can also be offered. All the standard designs have been proven by type testing, including Impulse withstand, temperature rise, sound level and short circuit tests. Utec’s pad-mounted distribution transformers share the following features: 

  • Safe, reliable and easy for operation.
  • Compact design and aesthetic appearance.
  • Economic and efficient to reduce network loss and working cost.
  • Low temperature rise and long service life.
  • High short circuit and insulating strength.
  • Low noise.
  • Utec’s standard proven surface treatment.
  • Robust construction for long time transportation under various conditions.
  • Flexibility in designing transformers to meet customer requirements (Optimum cost)
  • Competitive short delivery time.

Product Range:

  • Rating up to 4.0 MVA (Three Phase)
  • Primary voltage up to 36 kV
  • Secondary voltages up to 24 kV
  • Vector group: Dyn11 (other vector groups can also be provided on request)
  • Frequency: 60Hz, 50Hz, 50/60Hz
  • Insulation: Class A
  • Cooling: ONAN / KNAN
  • Available fluids: mineral or silicon oil (Other fluids can also be provided on request)

Standard Accessories:

  • HV Bushings
  • LV Bushings
  • Dial Type Oil Thermometer
  • Pressure Relief Device
  • Oil Level Indicator With Filler Stack
  • Off-circuit Tapselector
  • Oil Drain Valve
  • Earthing Terminals
  • Lifting Lugs
  • Silica gel Breather (for Breathing type)
  • Load Break Switch (for ANSI/IEEE standard)
  • Bay-O-net Fuses (for ANSI/IEEE standard)
  • Load Break Dry Well Fuse Holder (for ANSI/IEEE standard)
  • Pressure Vacuum Gauge (for ANSI/IEEE standard)

Optional Accessories (If required):

  • Dial Type Oil Thermometer With Two Contacts
  • Pressure Relief Device With Two Contacts
  • Oil Level Indicator With Two Contacts
  • Double Float Buchholz Relay With Contacts (for Conservator type) 
  • Winding Temperature Indicator with Two Contacts.
  • Thermometer Pocket
  • Filter Valve
  • Marshaling Box
  • Bi-directional rollers
  • DMCR Protection Relay (DGPT2)
  • Expulsion Fuses (for ANSI/IEEE standard)


© 2014 United Transformers Electric Company, All Rights Reserved