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8.1.2.2 Vapor phase drying inside the transformer tank
Before drying, the oil drain stopper at the bottom of the oil compartment must be loosened to discharge the
condensate.
Oil leakage will lead to OLTC and transformer damages! Loose oil drain stopper will
cause oil to leak from the oil compartment which will damage OLTC and transformer.
Oil leakage will lead to OLTC and transformer damages!
Avoid damaging the top cover of the OLTC and the sealing surface of the on-
load tap-changer head during disassembly and other operations. Make sure that
the tap selector is completely immersed in transformer oil and the diverter
switch compartment is filled with oil before operating the on-load tap-changer
for the first time after the transformer has been dried. If the OLTC is dried
inside the transformer tank, loosen the oil drain stopper. After drying, do not
forget to remove the current switch insert, close the stopper, and then reinstall
Damaged OLTC O ring will cause oil leakage from oil compartment which will
damage the OLTC.
Keep all small components in a safe place and do not drop them inside the oil
compartment.
1. Make sure to prevent small parts from falling into the oil compartment.
2. When disassembling and reassembling, the quantity of some small parts must be complete, be
sure to count clearly.
3. Avoid damaging the top cover of the on-load tap-changer and the sealing surface of the on-
load tap-changer head during disassembly and other operations. Make sure that the tap selector is
completely immersed in transformer oil and the diverter switch compartment is filled with oil
before operating the on-load tap-changer for the first time after the transformer has been dried.
After drying, do not forget to close the oil drain bolt in the oil compartment, and then reinstall
the divert switch insert of the on-load tap-changer.
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