The consequences for the system operation due to the reduction of the values of magnetic field requirements caused by transmission lines near urban areas A study case

摘要

According to the Brazilian Regulation, magnetic field density inside the Right of Way (RoW) oftransmission lines (TL) and on the TL RoW border must be respectively below 83.33 and 416.67μT.This limits are applicable both to old and new installations.In 2006, Eletropaulo, the electricity distribution utility in São Paulo, Brazil, was sentenced to reducethe magnetic field produced by all its transmission and distribution lines to 1μT as a consequence of alawsuit submitted jointly by Sociedade Amigos do Bairro City Boaçava (In English: Society of Friendsof the Neighborhood of the City Boaçava) and Sociedade de Amigos do Alto de Pinheiro (In English:Society of Friends of Alto Pinheiro). Eletropaulo appealed but the sentence was confirmed in 2008. In2012, in the judgment for the admission of Eletropaulo´s Extraordinary Appeal 627.189/SP, theReporting Justice of the decision to be taken by the Brazilian Supreme Court, before writing his vote,has convened a public hearing with the target of collecting opinions and testimonies of experts andinstitutions about the issue. One of the institutions was Operador Nacional do Sistema Elétrico –ONS, the Brazilian system operator, which has the responsibility of managing and operating theBrazilian interconnected system.The purpose of this paper is to discuss this subject, focusing on the following: investments andtechnologies needed to reduce the magnetic field produced by TL’s; and practical and economicrepercussions of such a reduction on the system operation and on the electricity supply.