Powertech Transformers & Controls Pvt. Ltd. cover a wide range Oil Cooled Transformers with On Load Tap Changer (up to 5000 KVA in11 kV & 33 kV) conforming to the international standards (BIS 1180 LEVEL-1 , 11 , 111) of quality and safety for industries and commercial set-ups. These transformers are designed and developed using latest technologies and can be provided with a variety of terminations so as to suit the requirements for new installation or replacement.The designs are so chosen that the total cost including material, maintenance and the energy cost due to no load and load losses are minimum .
The most significant material in a transformer is the winding which comprises of rectangular and round conductors used for windings. The conductor is usually insulated with either high-grade multi-paper covering or with an insulating enamel coating. The windings are designed so as to ensure reduced axial stresses during Short Circuit conditions and withstands impulse and over-voltages. Some standard forms of coil winding are Spiral,Helical, Cross-Over and Disc winding. For Power Transformers, both low voltage and high voltage windings are Disc type, which give highest resistance against short circuits. It is ensured proper tension is given on the winding for rigidness.
After receiving Copper conductor it will undergo Quality checking, Conductivity test (Resistance test) and during winding continuity of parallel conductors will also be checked.
Advantage of OLTC
Mainly OLTC is used in transformer with 500 KVA OR Above 500 KVA .Generally , Voltage may not be stable either high or low at that time voltage fluctuations may occur due to this System or Transformer with other Equipment may get damage .With help of OLTC , it can adjust The output voltage in a normal transformer can be varied by Changing the tapping.
Winding coils are compressed to the designed heights after the insulation is dried for specified duration to ensure their proper shrinkage to designed level. For higher rating transformers compressing is done by hydraulic press with suitably designed clamping fixtures.