Scenario
Steel Factory: 8 Equipment
Nameplate data of the transformers:
Namufact: xxx
Year: 1973
Power [MVA]: 85
Voltage [KV]: 63
Oil mass [Kg]: 18.150
Oil type: naphthenic blended
Solution
Selective depolarization treatment (Chedcos) in order to remove the corrosive sulfur compounds and dehalogenation treatments (CDP Process®) in order to remove the PCBs from the oils and transformers. the treatments were carried out on-site and on-load (transformer in service and fully load during the treatments).
Before the treatment |
After the treatment
|
|
| PCB* [mg/Kg] | 151 | 17 |
| TCS DBDS Eq. [mg/Kg] | 172 | < 10 |
| CCD | Corrosive | NOT Corrosive |
| Cu | 32 | 5,18 |
| TAN [mg KOH/g] | 0,131 | 0,01 |
| Color | 6.5 | 2 |
*The agreed guarantee was PCB < 50 [mg/Kg]
