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23rd International Conference on Electricity Distribution Lyon, 15-18 June 2015 Paper 0612 FULLER´S EARTH AS THE CAUSE OF OIL CORROSIVENESS AFTER THE OIL RECLAIMING PROCESS Maria Augusta MARTINS Rui Manuel MARTINS Anabela PEIXOTO EDP Labelec EDP Labelec EDP Labelec maria.augusta@edp.pt ruimanuel.martins@edp.pt anabela.peixoto@edp.pt consists of stirring the used oil, in the presence of Fuller’s ABSTRACT earth, in a suitable container, for during a certain period of Oil reclaiming is of growing interest since it allows the time.[3] increase of oil lifetime with low costs and minor environmental impact. In the reclaiming process, oil tests performed in the However, the overall reclaiming process should be laboratory are of particular importance. carefully controlled in order to achieve a final high quality of the reclaimed oil. Prior to regeneration, these tests are very important to In this work we report a case study of the reclamation of a characterize the oil, in order to study the feasibility of non-corrosive oil content of a transformer that became reclamation. If the oil characteristics indicate that the oil is corrosive, according to DIN 51353[1], just after suitable for reclaiming, it is very important to have its reclamation, as a consequence of this oil treatment. complete characterization, in order to plan the extension of About 9.9 ton of insulating oil from a 60 kV distribution reclamation, (duration of the reclamation, or number of transformer was reclaimed by an on-line reclaiming cycles that the oil should be in contact with the Fuller´s process based on the “contact method” using about 1200 earth).[4] kg of Fuller´s earth, in contact with the oil, during 74 h. The oil was characterized by several physico-chemical After the reclamation, the tests performed in the oil are tests, before and after the reclaiming process. The oil very important to check the performance of the collected for analysis, after the reclamation process, was reclamation process by the characterization of the oil classified as corrosive, according to DIN 51353 standard. condition. This result doesn´t comply with the specification of IEC The set of tests performed before the oil reclamation is 60296.[2] almost all the tests considered in the IEC 60422: Using several tests, we found that the corrosivity of the reclaimed oil was due to the type of Fuller´s earth used for Table I – Set of tests performed before the oil reclamation the reclamation treatment. This conclusion shows that it is very important to perform the Sulfur Corrosive Test by Breakdown Voltage - IEC 60156 DIN 51353 (discoloration of silver plate) before and after Dielectric dissipation factor (DDF) at 90ºC, IEC oil reclaiming process, in all the oil reclamations 60247 treatments, as an additional routine acceptance test for Appearance and Colour ISO 2049 and CEI 60296 this oil treatment. clause 6.6 Density - ISO 12185 INTRODUCTION Interfacial Tension at 25ºC - ASTM D971 Acidity - IEC 62021.1 Oil reclaiming is a technology that eliminates or reduces Water content - IEC 60814 clause 2 soluble and insoluble polar contaminants from the oil by Kinematic viscosity at 40ºC - ISO 3104 chemical and physical processing. This technology allows an used insulating oil to recover Flash Point (101,3 kPa) - ISO 2719 Procedure A their physicochemical and dielectric properties, and Deposits( IEC 60422) simultaneously washes polar impurities from the Particles ( IEC 60970) transformer solid insulation with the transformer Furfural content- IEC 61198 energized.[3] PCB content - IEC 61619 In reclaiming processes currently available, the most Inhibitor content (DBPC) - IEC 60666 commonly used ad

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