These treatments are applied in the following cases:
The requirements of this specification apply to high power
equipment at maximum voltage exceeding 72.5 kV, filled with inhibited or uninhibited
mineral insulating oils, the origins of which meet the specifications of IEC standard 60296
The service includes the following activities:
Following depolarisation from corrosive sulfur treatments and consequent elimination of DBDS, it may be necessary to restore the oxidation stability of the oil through addition of an anti-oxidant additive such as DBPC (2,6-ditertiarybutyl para-cresol) or ditertiary-butyl phenol.
The problem of corrosive sulfur can be solved effectively and durably only through Chedcos selective depolarisation; nevertheless ( read here ) Sea Marconi can also carry out passivation treatment which tends, however, to lose its effectiveness over time.
This operation involves adding a passivator additive (ToluilTriazolAmine or Ciba-Irgamet 39 or NyPass) to the corrosive oil in order to protect copper surfaces against the attack of corrosive compounds such as DBDS.
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