STL Transformers are made under a stringent stage-wise QA plan covering incoming area, production stages and final dispatches using state of the art production and testing facilities. STL possesses a team of qualified and experienced professionals to augment all activities and has an infrastructure and testing facility to manufacture and test transformers up to 33 KV Class and 2 MVA capacities in oil cooled. STL also manufactures and tests Dry Type Transformers up to 1 MVA, 33KV Class as per IS 1171.

Presently, STL has a manufacturing capacity of 200 MVA, with DRY TYPE & FURANACE TRANSFORMERS in its product range. Further capacity expansion is on the anvil. The transformers are type test certified for Temp. Rise, Lightning Impulse Voltage withstand test and short circuit withstand test. These tests have been carried out at ERDA and CPRI.


Silica Gel Breather, Pressure Release Valve*, Cable Box/Bare Bushing on HV and Cable Box/ Bus Duct on LV, WTI*, OTI*, MOG*, Off Load Tap Changer, Fin type Radiators, Lifting Lugs, Mounting Channels and Wheels, Rating and Diagram plate, etc.

STL also has 3 PHASE DRY TYPE TRANSFORMER in its product range. STL has manufactured up to 200 KVA 3 PHASE DRY TYPE TRANSFORMER and has the infrastructure to manufacture and test 3 PHASE DRY TYPE TRANSFORMER up to 1 MVA, 11KV Class.