Description: Single Phase/Wound Core Transformers use high grade CRGO steel, having low core loss for making circular cores. The inner core mendrels are inserted and correct shape is achieved by hydraulic jacks. These formed wound cores are annealed in an inert environment which ensures that the original characteristic of the magnetic steel are retained. The core so formed has rectangular cross section and accordingly the LV and the HV coils also have rectangular geometry. Whereas enameled copper conductor is used for the HV winding, paper cover or enameled rectangular strips are used for the low voltage windings. The insulation is designed to withstand the specified impulse level. These transformers use round tanks that are capable or withstanding the specified vacuum and pressure. The core coil assembly is processed under alternate cycles of heat and vacuum and after being placed in the tank is impregnated with processed transformer oil. The transformer is tested for oil leakage and pressure.
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