Arrange shutdown of the line. Place earth chain on line at required place. for suspension type of Discs, hold the complete strings with conductor by ratchet type pull lift fixed with cross arm to loosen the string and take out and replace defective discs. release the discs and leave in original shape.
For tension type of discs the conductor has to be pulled by wrinch Machine so as to release tension on the discs, take out and replace defective discs / Fit the conductor in tension string. Release the conductor so that the tension string come back to its original status.
As above and following additional :
Arrange shutdown of the line. Place earth chain on line at required place. Open the earthwire / Conductor at the adjoining straight line towers on either side and place the same in roller at suspension tower, bring the broken ends together as for as possible. Check for the damaged portion of earthwire / conductor. Cut-out the defective length and measure the same. Provide equal length of fresh material. Complete the jointing job to require type of fitting / joints. Pull the earthwire / conductor to required height and fix the tension fittings in position one either side of the tower by pulling operation with wench Machine. Fix the suspension fittings on either side on straight line towers with earthwire / conductor. Remove earthing chain and other devices from the line and confirm their removal.
turn the shutdown and re-energize the line.
Sp,e ptjer ,pr activities / operation may be required for 400 KV transmission lines involving twin bundle conductor, spacers, corana rings, T-Jumpering on Transpositions towers etc. Necessary provisions to meet out the requirement for such jobs will have to be kept ready for the 400 KV systems.
It may be ensured that no mid span joint is provided within 30 m. from tower. Two joints should not be provided in any single span.
As above excepting derrik pole, drum jack etc. required more.