Previous Scope of service by Tan & Sons Service Dismounting and mounting of the on-load tap-changer insert Cleaning and inspection of the mechanical parts Visual inspection of insulation distances of the on-load tap-changer insert and the oil compartment Parts replacement Replacement of the switching oil (unused oil with a breakdown voltage of > 50 kV/2.5 mm, in compliance with IEC 60156) Determination of the contact wear Measurement of the transition resistors Inspection of the motor drive, drive shaft and protective relays Functional test Dynamic Resistance Test for OLTC
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