Real cases
1. PCB/POP-free and environmental protection (France 2004-2012)
Scenario
Utilities with nuclear, thermal and hydropower power stations with a total of 1,093 transformers at generation, transmission and distribution poles.
Technical specifications of transformers:
- Maximum power [MVA]: 760
- Maximum voltage [kV]: 400
- Oil mass [kg]: 75,000 each
- PCB max[mg/kg]: 5,000
- PCB target[mg/kg]: < 20(after 90 days)
Sea Marconi Solution
Solution: CDP Process® dehalogenation treatment for removal of PCB + Chedcos depolarisation treatment for restoration of physical-chemical properties in both off-load and on-load mode
2. PCB/POP-free and environmental protection (France 2008)
Scenario
Technical specifications of transformers:
- Type of transformer: step-up transformer
- Manufacturer: Alsthom
- Year: 1974
- Power [MVA]: 760
- Voltage [kV]: 400
- Oil mass [kg]: 55,000
Sea Marconi Solution
Solution: CDP Process® dehalogenation treatment for removal of PCB + Chedcos depolarisation treatment to restore physical and chemical properties in both off-load and on-load mode.
| Before treatment | After treatment | |
|---|---|---|
| TAN [mg KOH/g] | 0.029 | < 0,010d> |
| Discharge voltage [KV] | 58.7 | 75 |
| PCB [mg/kg] | 57.2 | 9.6 |
3. PCB/POP-free and environmental protection (Cyprus 1997)
Scenario
Cyprus energy authority with a total of 520 electrical machines containing insulating fluids contaminated by PCB
Technical specifications of transformers:
- Maximum power [KVA]: 10-1,000
- Mass of contaminated oil [kg]: 94,000
- PCB max [mg/kg]: 15,000
- PCB target [mg/kg]: < 10pan>
Sea Marconi Solution
Solution: CDP Process® dehalogenation treatment.
The Sea Marconi treatments allowed the Cyprus energy authority to save about USD 2 million compared with the alternative solution (purchase of new oil, replacement of contaminated oil and incineration of the latter)
4. PCB + C1-corrosive sulfur with DBDS (Sweden 2012)
Scenario
Primary aluminium production company with 8 rectifier transformers (Sweden).
Technical specifications of transformers:
- Manufacturer: Brown Boveri
- Year: 1930
- Power [MVA]: 19
- Voltage [kV]: 13
- Oil mass [kg]: 15,000
- Oil type: blended mineral
Solution
Selective depolarisation (Chedcos) treatment for removal of DBDS and dehalogenation ( CDP Process) treatment for removal of PCBs in on-load mode (transformer energised and under load throughout entire treatment)
The treatment was performed with a guarantee of DBDS < 10 mg/>g, PCB < 2 mg/>g and the restoration of other parameters within the ranges suggested by IEC 60422 ed. 4, 2013
| Before treatment | After treatment | |
|---|---|---|
| PCB [mg/kg] | 29 | 0.37 |
| DBDS [mg/kg] | 18 | < 5d> |
| IFT [mN/m] | 24 | 42 |
| CCD Test | corrosive | NON-corrosive |
| TAN [mg KOH/g] | 0.34 | 0.01 |
| DF | 0.230 | 0.002 |
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