Tag: oil treatment

Chile depolarisation. One of the most “extreme” missions performed by Sea Marconi has been concluded successfully: the treatment of 6 transformers in the desert of Atacama in Chile, the driest place in the world, at 9,000 feet altitude with a temperature range between day and night of more than 30 °C. Our operational engineers were able to adapt to really difficult conditions suchRead more

Scenario Hydro power plant Nameplate data of transformer: Transformer: power transformer Year: 1948 Power [MVA]: 33 Voltage [KV]: 225 Oil mass [Kg]: 74.000  Solution Sea Marconi Solution: Dehydration treatment performed on-load (transformer fully load during the treatment) Before the treatment After the treatment After 6 months Oil temp. [°C] 15 63 35 Dissolved water [mg/Kg] IEC 60814 28 8 14 Saturation pecentageRead more

Scenario Hydro power plant Nameplate data of transformer: Transformer: GSU transformer Power [MVA]: 30 Voltage [KV]: 130 Oil mass [Kg]: 58.000 Oil type: paraffinic Before the treatment Cu [mg/Kg] 43 TAN [mg KOH/g] 0,213 Color 3 DF 1,268 Solution Sea Marconi Solution: Selective Depolarization treatment (Chedcos) performed on-load (transformer fully load during the treatment) Selective depolarization treatment: Chedcos Before the treatment After theRead more

Scenario Uruguayan utility October 2012: Failure 2 weeks after a reclaim treatment with fuller earth (performed by a local operator). Nameplate data of the transformer: Transformer: grid transformer with OLTC Namufact.: xxx Year: 1977 Power [MVA]: 425 Voltage [KV]: 500 Oil mass [Kg]: 58.000 Oil type: YPF65 paraffinic oil not inhibited Evidence of electrical arc on the contacts of the selector Analysis and diagnosis (byRead more

Scenario 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 Solution 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 performedRead more

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 Oil Fingerprint. It shows the presence of sulfur compounds responsible for oil corrosivity 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 oilsRead more

Scenario Il classico trattamento con terre follari si dimostra totalmente inefficace contro lo zolfo corrosivo Caratteristiche tecniche del trasformatore: Costruttore: xxx Anno: 1969 Potenza [MVA]: 14 Tensione [KV]: 63 Massa olio [Kg]: 4.200 Tipo di olio: Esso Univol 54 Oil Fingerprint. Presence of sulfur compounds without DBDS Il trattamento con terre follari (NON da Sea Marconi) non ha prodotto alcun risultatoRead more

Scenario Thermal power plant with 8 GSU transformers Nameplate data of the transformers: Power [MVA]: 175 Voltage [KV]: 400 Oil type: naphthenic oil C2 – Corrosion not caused by DBDS Step 1 The diagnosis in the 2009 showed: Total sulfur = 200 mg/Kg TCS (Total Corrosive Sulfur) = 157 mg/Kg (DBDS eq.) CCD Test = corrosive IFT = 19 mN/m DBTPRead more

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] 125Read more

Scenario Primary substation with 3 Grid transformer and 2 shunt reactors Nameplate data of the transformer: Manufact: xxx Year: 1998 Power [MVA]: 250 Voltage [KV]: 345 Oil mass [Kg]: 118.000 Oil type: naphthenic Analitical and diagnostic results The analysis and subsequent diagnosis performed by Sea Marconi on the machines of the customer showed a clear presence of DBDS Distillation profile ofRead more