âDBDS & CORROSION FREEâ Programme: Diagnosis and ... - CigrÃ©

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Solutions > Countermeasure no. 8 (1/2)Oil Exchange©2009 Sea Marconi Technologies sas - All Right ReservedTo guarantee DBDS concentration < 10 mg/kg (after 90 days) itsnecessary to exchange the oils twice.The typical concentration of the DBDS in “Unused mineral insulating- Naphthenic Base with DBDS” is 150-250 mg/Kg. This oil changeevidently reduces the corrosive compounds content of the oil,diluting them accordingly with the ratio between the new oiladded and the remnant old oil (which results from the addition ofthe oil adsorbed on the active part and the oil remaining in thebottom of the tank).That typical ratio may be 10% (CIGRE A2.32-art. 4.3 pag. 25) ormore, depending on the amount of paper and other adsorbingmaterials, and on the shape of the tank also. When the oil is tobe changed, a preventive test of corrosive sulfur on a suitablemixture of the old and the new oil should clarify if the mitigationaction will be adequate to obtain finally a non corrosive oil.EMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 2009Solutions > Countermeasure no. 8 (2/2)Crossed contamination of usedoil by DBDS (bulk reclamation)©2009 Sea Marconi Technologies sas - All Right Reservedmg/Kg60,0050,0040,0030,0020,0010,000,001b 1a 2b 2a 3b 3a 4b 4a 5b 5aSamplesSampleConcentration of dibenzyldisulfide in samples before (b) and afterreclamation (a). GC-MS and GC-ECD analyses.1 According to ASTM 1275 B (150°C, 48 h)1b1a2b2a3b3a4b4a5b5amg/KgDBDS20,9522,0022,5213,6550,0414,0312,6417,7515,4712,46Corrosivesulphur 14a4a4a4a4a4a4a4a4a4bEMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 200950
Solutions > Countermeasure no. 9Replacement of windings-spare parts©2009 Sea Marconi Technologies sas - All Right ReservedA. The corrosion process and the formation of coppersulfides are irreversible. The Selective Depolarisationand oil exchange are not able to eliminate thedeposit trapped on insulating papers and windings.B. The deposit of copper sulfides accumulated does notmodify the DP of papers, but modifies, in anirreversible manner, the insulating electric propertiesthat could become critical.C. Under this critical condition, it is necessary toreplace the components, the windings and/or theequipment.EMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 2009Solutions > Countermeasure no. 10 (1/6)No-Sulfur Corrosion and Effects on losses©2009 Sea Marconi Technologies sas - All Right ReservedEMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 200951
Page 3 and 4: Sea Marconi - Laboratory 3/3©2009
Page 5 and 6: Sea Marconi - KitsInspection andSam
Page 7: Sea Marconi - PCBs Free SolutionsCD
Page 10 and 11: Transformer Fleet©2009 Sea Marconi
Page 12 and 13: FocusProtection of Resources Assets
Page 14 and 15: IEC Standards©2009 Sea Marconi Tec
Page 16 and 17: Case historyCase history of Total S
Page 18 and 19: Corrosion phenomenaMaterials presen
Page 20 and 21: Failures (3/6)Corrosive Sulfur: rel
Page 22 and 23: DBDS DiscoveryJuly 2005, DBDS in oi
Page 24 and 25: DBDS confirmationOilDBDSCuTemperatu
Page 26 and 27: Potentially Corrosive Sulfur - CCD
Page 28 and 29: Total Corrosive Sulfur - SM-TCSWash
Page 30 and 31: Oil Fingerprinting Profile - SM - I
Page 32 and 33: “DBDS & Corrosion Free Program”
Page 34 and 35: ABC Diagnostic Coverage of strategi
Page 36 and 37: Post mortem and/or post failures di
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