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The expansion planning of generation, transmission and distribution systems of electric power requires environmental assessments of strategic nature, with the incorporation of the environmental dimension as a variable in the decision making process. In this sense, it is noteworthy the development of methodologies for incorporating the socio-environmental dimension in the electrical systems planning.
In Brazil, the energy planning has been carried out by the government through a sequence of studies on Expansion Plans coordinated by the Ministry of Mines and Energy (MME). This sequence is structured in long-term studies (Energy Matrix and National Energy Plan) and also short-term studies (Ten-Year Energy Expansion Plan).
AAEXP (Strategic Environmental Assessment for Generation Expansion Planning) is a project focused on the development of tools that seek environmental assessment of generation expansion plans, having as methodological reference the assumptions of the Strategic Environmental Assessment (known by the Portuguese acronym AAE), adequate to the evaluation of impact assessment as support to decision making at the level of policies, plans and programs. In this manner, the synergistic and cumulative impacts, either inter-sectorial, regional or global, are analyzed in a more appropriate and integrated manner.

In the past, methodologies such as the one proposed for the socioenvironmental evaluation in previous editions of the Ten-Year Energy Expansion Plan have been developed in the scope of this project. Also, a methodology for defining the social and environmental impact index of reference for the expansion of the National Interconnected System (NIS) was also developed, aiming at its application to the complementary energy of the alternatives of division of the water head in hydroelectric river basin inventory studies.
Currently, the project is subdivided into three branches: Development of metrics for the socio-environmental impact of electric energy sources for insertion into long-term planning models; Methodology for evaluating the socio-environmental criticity of wind projects; and the Ambientrans Model: minimization of socio-environmental impacts related to the implementation of transmission lines projects.
Aiming to broaden the scope of analysis of energy system expansion in the MATRIZ model within the multiobjective approach, the project called "socio-environmental impact metrics of electric energy sources for insertion into long-term planning models" seeks to select the most relevant socio-environmental issues in long-term energy planning studies. It also aims to propose ways for its implementation in the model, incorporating the social-environmental variable as a criterion for long-term planning.
The methodology for Local Criticality Assessment of Wind Energy Projects aims to: evaluate the potential positive and negative impacts of wind farms to Brazilian localities based on primary field information, thus outlining the main drivers of acceptance or non-acceptance of the technology; and to develop a methodology to minimize the negative impacts and increase local wind farms gains, considering the environmental, economic and social spheres, which can reduce delays and conflicts between the different agents involved in the activity.
The methodology used in the development of the so-called Ambientrans tool relies on the use of geoprocessing tool, being based on the minimization of negative impacts and on the consideration of the main technical aspects of construction in the process of formulation, evaluation and selection of alternatives of transmission line corridors. It takes as a base the method of superposition of thematic charts, where each theme corresponds to an aspect or to a set of selected aspects that represent restrictions or points / areas of attraction for the passage of transmission lines.


Figure: Three Corridor Alternatives considering Different Criteria


In the figure above, the AMBIENTRANS tool was used favoring different criteria. The green alternative privileges the parallelism with existing transmission lines; the blue alternative privileges the proximity to existing roads and the red alternative privileges land use.


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The external power arc tests are carried out by the High Power Laboratory (AP2), located in the Adrianópolis Unit. They aim at verifying the withstanding capacity of insulators and insulator strings when submitted to external power arcs resulting from phase to ground fauilures. The satisfactory performance of equipment under such conditions is important to the security of the electric system and the continuity of the energy supply.


The tests performed by AP2 are suitable for high voltage equipment. To this end, the laboratory has the infrastructure to provide voltages and currents and meet the specificities of the clients and/or the test standards, within the limitations of the laboratory, for example: calibrated measurement systems; switches and circuit-breakers for current establishment and interruption; current limiters; protection systems and suitable current and voltage sources.


The main clients of these tests are: electricity utilities and equipment manufacturers.




• IEC 61467

• Client's specification


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 Considerando o crescente interesse em avaliar a interação entre sistema de energia elétrica e equipamentos de alta tensão, algumas concessionárias do setor elétrico brasileiro têm solicitado ao Cepel medições e avaliações quanto a solicitações impostas aos seus equipamentos, principalmente em transformadores, autotransformadores e reatores. Esta situação começou a ganhar relevância em casos em que há necessidade de identificar os motivos de falhas de equipamentos.


A fim de identificar a que tipo de solicitação elétrica um equipamento está submetido, ele é instrumentado, e tensões transitórias decorrentes de manobras na subestação são aquisitadas durante alguns meses.  Em alguns casos, o equipamento é, previamente, caracterizado no domínio da frequência (SFRA - sweep frequency response analysis) para se obterem as amplitudes e frequências de ressonância e antirressonâncias naturais.


Os valores das tensões transitórias são armazenados num hardware específico e disponibilizados via intranet para as análises necessárias. Eventos decorrentes de descargas atmosféricas não são considerados.


Baseando-se nas aquisições das tensões transitórias que atingem o equipamento, os sinais são analisados, e suas frequências principais são identificadas através da utilização de uma rotina FFT (Fast Fourier Transform).


A partir da identificação das frequências naturais de oscilação do equipamento e do espectro de frequências de tensões transitórias capazes de alcançar o equipamento sob análise, é possível inferir se há alguma interação entre o equipamento e tensões transitórias geradas por manobras na subestação ou no sistema.


Com base nas informações de frequências e amplitudes dos sinais aquisitados, são realizadas as seguintes avaliações: efeito das manobras nas frequências naturais de oscilação do equipamento, e avaliação do risco envolvido nas manobras medidas por meio do fator de severidade no domínio da frequência (FSDF).


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