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] | 7 | 3 |
| TAN [mg KOH/g] | < 0,095 | < 0,01 |
| DF | 0,0190 | 0,0033 |
