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

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Corrosion phenomenaMaterials present in a transformer:Iron, copper and other (minor) metalsOil/insulating liquidsCellulose or other solid insulationWood and pressboardsRubber, glues, polymers, etc.©2009 Sea Marconi Technologies sas - All Right ReservedPossible chemical interactions between different materials:Acid corrosion (oil to copper, oil to iron)Formation of complexes (oil to copper, oil to iron)Catalysis of redox reactions (acids, water, additives)Oxidation (oxygen, peroxides to oil/cellulose)Dissolution of soluble compounds (oil to rubber, oil to polymers)EMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 2009Corrosion phenomenaContaminants resulting from corrosion:Dissolved copper (and other metals)Suspended copper (and other metals)Copper complexesInsoluble copper salts (copper sulfides, copper oxides)©2009 Sea Marconi Technologies sas - All Right ReservedClassification of corrosion phenomena:Related to copper sulfide formation (Corrosive Sulfur)copper sulfide growth on naked conductorscopper sulfide growth on solid insulationRelated to copper formation (NO-Sulfur Corrosion)dissolved/suspended copper in oilcopper deposition/adsorption on solid insulationEMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 200918
Failures (1/6)LinesCase history of failuresDue to Corrosive Sulfur on a 500 KV line – BrazilSubstationsTotal reactorsTSNReactors withCorrosive SulfurTotal failed reactors1181 km64037(92,5%)15(37,5%)©2009 Sea Marconi Technologies sas - All Right ReservedLinesSubstationsTotal reactorsNovatransReactors withCorrosive SulfurTotal failed reactors1278 km63613(36,11%)-EMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 2009Failures (2/6)Corrosive Sulfur: related failuresFailures related to Corrosive Sulfur encountered in lastyears©2009 Sea Marconi Technologies sas - All Right ReservedFailurePresence of deposits of Cu 2 SEMPRESA ELÈCTRICAS CHILENAS Y CIGRE – 12/13 August 200919
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 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
Page 38 and 39: Post mortem and/or post failures di
Page 40 and 41: Solutions > Countermeasure no. 2 (2
Page 42 and 43: Solutions > Countermeasure no. 4For
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