1)Transformer with OCTC (off circuit Tap Changer)
Powertech Transformers & Controls Pvt. Ltd. cover a wide range Oil Cooled Transformers with 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 Copper Winding: The most significant material in a transformer is the winding which comprises of rectangular and round conductors used for winding. 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 winding 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. Coil Tightening: 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.
OCTC: Off-load Tap Changer with help of this we can adjust Voltage Manually
| Ratings | Up to 10000 kVA |
| Number of Phase | Three Phase |
| Applicable Standards | IS, CEA, IEC, ANSI, BS, EN, etc. |
| Cooling | ONAN |
| Insulating Fluid | Mineral Oil as per specification |
| Frequency | 50 Hz, 60 Hz |
| Vector Group | As specified |
| Primary Voltage | Up to 33 kV |
| Secondary Voltage | 415, 433 V OR 11000V(Other Voltages as required) |
| Winding Material | Copper / Aluminium |
| Tapping Range | + 5% to - 5% in steps of 2.5%(Other tapping’s as required) |
| Impedance | In line with applicable standards(or) As per customer requirement |
2)Transformer with OLTC (On Load Tap Changer)
In larger power transformers, for proper voltage regulation of transformer, an on load tap changer is required. As there is no permission of switching off the transformer during tap changing. The tapping arrangement, is placed in separate divertor tank attached to electrical power transformer main tank. Inside this tank, the tap selectors are generally arranged in a circular form. The divertor switches have contacts operating in rapid sequence with usually four separate make and break units.
The OLTC selector arrangement for 16 steps and 17 positions.
| Ratings | Up to 10000 kVA |
| Number of Phase | Three Phase |
| Applicable Standards | IS, CEA, IEC, ANSI, BS, EN, etc. |
| Cooling | ONAN |
| Insulating Fluid | Mineral Oil as per specification |
| Frequency | 50 Hz, 60 Hz |
| Vector Group | As specified |
| Primary Voltage | Up to 33 kV |
| Secondary Voltage | 415, 433 V OR 11000V(Other Voltages as required) |
| Winding Material | Copper / Aluminium |
| Tapping Range | + 5% to - 15% in steps of 1.25%(Other tapping’s as required) |
| Impedance | In line with applicable standards(or) As per customer requirement |
HV / LV Cable Box
Rollers (Uni-Directional / Bi-Directional)
Drain Valve
Conservator and Silica gel Breather
Pressure Relief Device
Off Circuit Tap changer / OLTC
Technical Parameters of the products contained in this website are generic in nature. Please contact us for any Latest / Updated / Specific Information.
ApplicationsIndustries, Power Generating Stations, Receiving Stations, Substations & Railways.
Technical Parameters of the products contained in this website are generic in nature. Please contact us for any Latest / Updated / Specific Information
