Scenario

Company in the chemical business, 4 GSU transformer

Nameplate data of the transformer:

Manufatc: xxx
Year: 2000
Power [MVA]: 47
Voltage [KV]: 34
Oil mass [Kg]: 12.000
Oil type: naftenico

Solution

Solution: Selective depolarization treatment (Chedcos) performed on-ste and on-load (transformer in service e fully load during the treatment).

The treatment has guaranteed DBDS < 10 mg/kg.

Before treatment

After treatment

DBDS [mg/Kg]125< 5
H2O [mg/Kg]73
TAN [mg KOH/g]< 0,095< 0,01
DF0,01900,0033

Identified Critical issues


Applied solutions

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