Hydro power plant with 3 GSU transformers

Nameplate data of the transformer:

Manufact: xxx
Year: 1965
Power [MVA]: 80
Voltage [KV]: 220
Oil mass [Kg]: 35.000
Oil type: naphthenic blended


Selective deplarization treatment (Chedcos) in order to remove the corrosive sulfur compounds and dehalogenation treatments (CDP Process®) in order to remove the PCBs from the oil and the transformers. the tratments were performed on-site and on-load (transformer in service and fully load during the treatment).

Before the treatment

After the treatment

PCB* [mg/Kg] 96 26
TCS (total corrosive sulfur) DBDS Eq. [mg/Kg] 64 < 10
CCD Corrosivw NOT Corrosive
DBTP [mg/Kg] 16 14
TAN [mg KOH/g] 0,194 0
TgD 0,03737 0,05144

*The agreed guarantee was PCBs < 50 [mg/Kg]

Identified Critical issues

Applied solutions

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