Transformer Core Coil Assembly

  • The limbs of the core are tightly wrapped with cotton tape; cylinder made out of insulating press board/presspahn paper is wrapped on all the three limbs
  • Low voltage coil is placed on the insulated core limbs; insulating block of specified thickness and number are placed both at the top and bottom of the LV coil
  • Cylinder made out of corrugated paper or plain cylinder with oil ducts are provided over LV coil; HV coils are placed over the cylinder; gap between each section of HV coils including top and bottom clearances is maintained with the help of oil ducts, as per the design/drawings
  • The top yoke is refilled; top core frame including core bolts and tie rods are fixed in position; primary and secondary windings are connected as per the requirements
  • Phase barrier between HV phases are placed as per requirement; connections to the tapping switch or OLTC (if required) are made.

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