Scenario

Steel Factory: 8 Equipment

Nameplate data of the transformers:

Namufacturer: xxx
Year: 1973
Power [MVA]: 85
Voltage [KV]: 63
Oil mass [Kg]: 18.150
Oil type: naphthenic blended

Fingerprint dell’olio. Si evidenzia la presenza di composti solforati responsabili della corrosività dell’olio

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]

Problèmes critiques identifiés


Solutions appliquées

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