Tag: C1

Scenario Transmission utility in the Middle East with a fleet of strategic transformers (380 kV, up to 500 MVA), operating under high load and extreme climatic conditions. A diagnostic campaign highlighted the widespread presence of DBDS and corrosive sulfur compounds in the insulating oils, with potential risk of metallic sulfide formation and consequent failures. Technical characteristics 22 units (transformers, autotransformers,Read more

Sea Marconi is one of the world’s leading experts on corrosion phenomena, having discovered DBDS in 2005 as the main cause of failures related to corrosive sulfur (C1). In the last 2 years Sea Marconi has assisted, and has been directly involved, on several cases of failure related to corrosion phenomena on the silver contacts of the selectors, with very

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The technical-scientific article describing the corrosive sulfur depolarization treatment (DBDS removal) on giant transformers that Sea Marconi is carrying out in Saudi Arabia has seen the publication (October 2022) in the main sector magazine, Transformer Magazine. The article is entitled: "On-load integrated treatment of giant power transformers in a severe scenario". The article, subjected to careful technical review by TransformerRead more

Sea Marconi recently intervened to treat a transformer in a hydro-electric production plant in the north of Portugal, owned by EDP (Energias de Portugal), one of the largest producers of energy in Europe and one of the most important industrial groups in Portugal. The brilliant results of this activity earned Sea Marconi formal qualification by EDP (Labelec) for the “regeneration” of insulatingRead more

L’eco The echo generated by the depolarisation from corrosive sulfur carried out last year on 5 transformers (170 tons of oil) at the Urrà power station is arousing considerable interest amongst owners of fleets of electric machines in Colombia. It is not by chance that major projects (e.g. Cali, Medellin, Bogotà) are taking life with the main public and private companies andRead more

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 Company involved in production of primary aluminum with 8 rectifiers transformers Nameplate data of the transformers: Transformer: rectifier, ODAF with membrane Manufact: xxx Year: 1998 Power [MVA]: 93,4 Voltage [KV]: 66 Oil mass [Kg]: 27.200 Oil type: naphthenic Step 1 First failure with discharges of high energy (D2) Step 2 Post failure analysis, oil fingerprint with identification ant quantification ofRead 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

Scenario 4 GSU transformer at thermal power plant Nameplate data of the transformers: Manufact: xxx Year: 1997 Power [MVA]: 192 Voltage [KV]: 400 Oil mass [Kg]: 58.000 Oil type: naphthenic May 2005 The analysis and subsequent diagnosis performed by Sea Marconi on the equipment of the customer showed: Index of corrosiveness =1 (max level) ASTM b 48H= 4C Overall Health index: 0.52Read more