Scope of service by Tan & Sons Service | Tan & Sons Corporation Limited

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