On 6th and 7th July 2011 in Santiago (Chile) the Jorpa Ingeniería SA company, in collaboration with the Chilean CIGRE Committee, organized an International Seminar on Power Transformers. The event hosted some 200 market players and industry experts from around the world, including: SEA Marconi (Italy), EFACEC (Portugal), MR (Brazil), Siemens (Brazil), Omicron (Austria), Double (USA).The experts took turns on stage at the conference to make a point about the techniques and methods for proper management of transformers fleet and insulating liquids.Vander Tumiatti, for Sea Marconi, has presented two papers very appreciated by the audience, below titles with their abstracts.
“BAT/BEP – LCM: inventory, control, management, integrated decontamination & dehalogenation of PCBs & Oil and transformers – Case History ”.
V. Tumiatti*, M. Tumiatti, C. Roggero, R. Actis and R.Maina
Sea Marconi Technologies S.a.s.
Via Ungheria 20, 10093 Collegno (Turin) – Italy
*Founder and General Partner of Sea Marconi and Ass. Secretary IEC TC 10
e-mail: tumiatti@seamarconi.it
Abstract
This paper describes the “state of the art” for inventory, control, management, decontamination of electrical equipment and insulating liquids containing PCBs & POPs.
A new diagnostic method, developed by Sea Marconi (patent pending) called “Total Chlorine and PCBs screening -TCPs”, to quantitatively determination of Total Chlorine and PCBs screening in the oil, is described. The best available techniques (BAT) and best environmental practices (BEP) for life cycle management (LCM) of electrical equipment impregnated with insulating liquids, according the prescriptions of the Stockholm Convention on Persistent Organic Pollutants (POPs) entered into force on May 17th 2004, are presented.
The paper describes a review of the standards: IEC 60296 Ed.4-2011 “unused mineral insulating oils for transformers and switchgear”; IEC 60422 Ed.4-2011 “mineral insulating oils in electrical equipment-supervision and maintenance guidance”; CENELEC CLC/TR 50503 February 2010 “Guidelines for the inventory, control, management, decontamination and/or disposal of electrical equipment and insulating liquids containing PCBs.”; CIGRE 413 Working Group D1.01(TF 12) April 2010 “Insulating Oil Regeneration and Dehalogenation”.
The most recent decontamination and dehalogenation technique (CDP Process patented by Sea Marconi) in continuous mode by closed circuit process, uses a solid reagent consisting of a higher molecular weight glycol mixture, a mixture of bases and radical promoter or other catalyst for chemical conversion of organic chlorine in inert salts, on a high surface area particulate support. This process normally runs typically at 80-100 °C and has the capability to decontaminate equipment on-site, through continuous circulation of the oil a closed system ( without draining the oil or using auxiliary tanks) using the solvent capability of the oil for continuous extraction of PCBs from solid materials inside the equipment. This solution prevents the critical reactions (reaction with Sodium at 150-300 °C and risks of explosion and fire; reaction with KPEG at 130-150 °C), ensuring at the same time, higher efficiency and lower operating costs. Also they are capable of working on-site, both on large transformers and medium/small size ones, and when accessibility to the site is difficult, by using compact decontamination mobile units(DMU). In the specific case of chemical dehalogenation of PCBs, the change of oil and the creation of PCBs classified wastes are prevented.
The countermeasures available to prevent and or mitigate the effects of PCBs & POPs are reported hereby, with regards to their effectiveness. The case history of decontamination and dehalogenation of PCBs by mean of on-load and off-load “CDP Process” is compared with other techniques.
“DBDS & Corrosion Free” Programme 2011: Diagnosis and Countermeasures
V. Tumiatti*, R. Maina, M. Tumiatti, C. Roggero and R. Actis
Sea Marconi Technologies S.a.s.
Via Ungheria 20, 10093 Collegno (Turin) – Italy
*Founder and General Partner of Sea Marconi and Ass. Secretary IEC TC 10
e-mail: tumiatti@seamarconi.it
Abstract
This paper describes the “state of the art” for corrosions phenomena involving copper, mineral insulating oil and solid insulation of oil-immersed transformers and reactors. The paper reports evidences of presence, occurrence and effects of DiBenzyDiSulfide (DBDS), other “Corrosive Sulfur” compounds and “No-Sulfur Corrosion” in insulating mineral oil. Both copper sulfide deposition and dissolved copper formation are investigated, giving evidences derived both from field experience and laboratory tests.
Two new diagnostic methods (developed by Sea Marconi-patent pending), called “Total Corrosive Sulfur-TCS”, to quantitatively determination of corrosive sulfur compounds in the oil and “FingerPrint -IFED” are described.
The best available techniques (BAT) and best environmental practices (BEP) for life cycle management (LCM) of mineral insulating oils in electrical equipment-diagnostic of corrosion phenomena and evaluation of the tendency of the oil to form conductive deposits are presented.
The paper describes a review of the standards: IEC 60296 Ed.4-2011 “unused mineral insulating oils for transformers and switchgear”; IEC 60422 Ed.4-2011 “mineral insulating oils in electrical equipment-supervision and maintenance guidance”; IEC 62697 Ed.1-2011 (FDIS) “Insulating liquids – Quantitative determination of corrosive sulfur compounds in used and unused insulating liquids – Part 1: Test method for quantitative determination of dibenzyl disulfide (DBDS) – Part 2: Test method for quantitative determination of total corrosive sulfur (TCS)”; CIGRE 378 April 2009 Working Group A2.32 “Copper sulphide in transformer insulation”.
The countermeasures available to prevent and or mitigate the effects of corrosion phenomena are reported hereby, with regards to their effectiveness. The removal of corrosive compounds or dissolved copper by mean of on-load and off-load “Selective Depolarization” is compared with other mitigation techniques.
