Ramalho de Mello, Darcy

Consultant & Researcher, Brazil

Ramalho de Mello, Darcy

Consultant & Researcher, Brazil

Biography

Practical Application of Pollution Standards: Issues & Questions

Mr. Mello studied Electrical Engineering at Rio de Janeiro Federal University where he obtained his Masters Degree. He worked as Research Engineer in the Electrical Energy Research Center (CEPEL) from 1978 to 2013, focusing on high-voltage and pollution tests on insulators for overhead lines and substations. Currently, he works as Consultant for several Brazilian electric utilities in insulation dimensioning and R&D for new lines. He is Chairman of the Brazilian Working Group for Insulator Standards, Brazil’s representative in IEC 36, a member of IEEE and Cigré and active in various WGs in Cigré and IEC.

Insulators must withstand normal operating voltage but also overvoltages that can lead to disturbances, flashovers and line outages. Reduction in performance occurs mainly through pollution depositing on insulation surfaces that forms a conducting or partially conducting layer when wetted. The focus of this presentation is to review problems with the practical use of existing standards that guide selection and specification of insulators for polluted service environments. Cases from power utilities are discussed as examples of such problems.

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