Um technical ebook was launched focusing on grounding photovoltaic plants, bringing together normative concepts, engineering fundamentals and practical recommendations for projects ranging from distributed microgeneration to centralized generation plants.
The publication is signed by Paulo Edmundo Freire, electrical engineer and Master in Power Systems from PUC-RJ; Geraldo Silveira, Master in Electrical Engineering from UFMG (Federal University of Minas Gerais) and Engineering Manager at CS Consultoria; and by INTELLI GROUP, which operates in the sectors of energy generation, transmission and distribution and grounding systems.
Electricity sector experts propose a comprehensive guide for professionals involved in the design, implementation, and commissioning of photovoltaic systems in Brazil. The material begins by differentiating the types of systems—GFV (photovoltaic generator), UFV-GD (distributed generation), and UFV-GC (centralized generation)—and discusses the lack of formal nomenclature in ABNT standards, proposing a technical distinction essential for the proper application of the guidelines.
Standards and technical requirements
Among the highlights, the eBook presents the main standards applicable to grounding systems, such as NBR 5419, NBR 16690, NBR 7117, in addition to international references such as IEC/TS 62738 and IEEE 2778. Topics such as protection against atmospheric discharges, electrical design requirements, geoelectrical modeling and soil resistivity are covered.
For UFV projects, the content reinforces the importance of specific modeling based on real soil data and highlights the need for deep and well-distributed geoelectrical surveys, especially in large areas with irregular topology.
Safety, performance and commissioning
The eBook devotes a significant portion to the topic of human safety, covering touch voltage criteria, PPE, and recommendations for grounding plant perimeter fences. It also details key grounding grid performance parameters—such as impedance, ground potential rise (GPR), and touch voltages—and the importance of using advanced software for accurate simulation.
A key point is the warning about the limitations of direct measurements after the system is installed. According to the publication, "design the grounding system as best as possible, because it will not be possible to measure it properly later," a direct reference to IEEE 2778's recommendations for large installations.
Materials and good practices
The content also explores the appropriate use of materials, such as copper-plated steel rods, bimetallic cables and connection methods (exothermic welding or compression), advising against the use of galvanized steel due to its low durability and lack of definitive connectors on the national market.
Finally, the concepts of Local and Global Earthing Systems are discussed, based on the EN 50522 standard, applicable to the integration of the various elements of the plant – such as substations, electrical centers and photovoltaic arrays – into a safe and functional system.
Deepen your knowledge
all the content of Canal Solar is protected by copyright law, and partial or total reproduction of this site in any medium is expressly prohibited. If you are interested in collaborating or reusing part of our material, please contact us by email: redacao@canalsolar.com.br.
