On-load Distribution Transformers
  • We manufacture IS-approved offload distribution transformers starting from 200 KVA to 2500 KVA under BIS-1180(Jan 2014).
  • Designed for a minimum 25 years of life-span with a 24*7 hours of performance, minimum maintenance and silent operation.
  • Indoor/Outdoor Pad Mounted
  • Copper/Aluminium Foil Winding a Thermally Upgraded Paper(TUP) insulation.

Features of On-Load Transformers

  • Electric Circuit is made using electrolytic grade with 99.99% pure High-Quality Copper from our regular and reputed vendor HINDALCO & STERLITE with Foil winding in L.V coil of the transformer.
  • Magnetic Circuit is made using step-lap design for lower losses and low magnetizing current of core by using high quality CRGO material with grades such as ZDKH, ZDMH, AMORPHOUS, MOH, etc.
  • High Dielectric Insulation property to withstand lightning impulses and voltage surges.
  • ONAN through natural convection for effective cooling through axial and radial ducts.


Benefits of On-Load Transformers

  • Due to the on load tap changer, the voltage at LV side remains at the limit against the voltage fluctuation from the HV side.
  • For changing taps, shutting down the factory is not reliable. But due to the on load transformer, you can or RTCCchange the tap even when your factory is in full load.
  • As there is RTCC panel with AVR (Automatic Voltage Regulator), LV side voltage remains in the desired range by changing the tap automatically.

Technical Specifications(OLTC)

Onload Transformers are installed where voltage fluctuations from HV side are continuous. So onload transformer changes tap using AVR without any power-cut and give constant output voltage. Thus, over-all power consumption of industry gets optimized hence results in power savings.

Type Indoor/ Outdoor Pad Mounted
Voltage Class 11, 22, 33 kV
Vector Group Dyn11
No. of phase 3 phases
Frequency 50/60 Hz
Tap Range +5% To -15% in 1.25% steps in 17 position or +5% To -15% in2.5% steps in 9 Positions or as per requirement of customer.
Winding Material Copper/ AluminiumFoil.
Applicable Standards BIS-1180
Painting Epoxy, Polyurethane or specified by customer