{"id":53687,"date":"2016-03-18T07:55:27","date_gmt":"2016-03-18T05:55:27","guid":{"rendered":"https:\/\/yilkomer.com\/solar-sistemlerde-topraklama-ve-espotansiyel-kavrami\/"},"modified":"2025-12-20T00:19:16","modified_gmt":"2025-12-19T21:19:16","slug":"the-concept-of-grounding-and-equipotential-bonding-in-solar-systems","status":"publish","type":"post","link":"https:\/\/yilkomer.com\/en\/the-concept-of-grounding-and-equipotential-bonding-in-solar-systems\/","title":{"rendered":"The Concept of Grounding and Equipotential Bonding in Solar Systems"},"content":{"rendered":"<p>Solar projects always require the utmost importance to be given to four-stage protection. After the design of <strong><span style=\"color: #ff6600;\"><a style=\"color: #ff6600;\" href=\"https:\/\/yilkomer.com\/en\/lightning-air-terminal-franklin-rod\/\" target=\"_blank\" rel=\"noopener\">Passive Air Terminals<\/a><\/span><\/strong> and LV Surge Protection Device design, the most critical pair is grounding and equipotential systems. In a solar project, many grounding practices are applied under the general definition of grounding. Foundation grounding, functional grounding, operational grounding, and protective grounding are implemented step by step in solar projects. However, the most important point is that all different grounding systems reach equivalent resistance values at the end of the project. Otherwise, it will be difficult for the facility to avoid fault currents and sudden voltage surges that may occur over many years. The subject of <strong>Grounding<\/strong> must absolutely be carried out based on technical calculations. Without measuring soil resistivity values and without measuring existing grounding resistance values if there are different resistivity zones outside the facility, design and implementation may not yield correct results.<\/p>\n<p>First of all, we must design a system based on calculations so that every metal reinforcement and every point in the facility can benefit from the global grounding line. As a result of risk analysis, a ring conductor should be installed around the plant, and according to the mesh dimensions obtained from the risk analysis, a grounding grid should be woven at the foundation of the plant to allow easy dissipation of surges. This grid must reach fences, table legs, and all foundation reinforcements. The number of grounding rods determined by calculations should be designed in parallel with the <em><strong><a href=\"https:\/\/yilkomer.com\/en\/topraklama-olcumu\/\" target=\"_blank\" rel=\"noopener\">soil resistivity<\/a><\/strong><\/em> value. Generally, grounding electrodes and grounding conductors used along the ring line should be buried starting from a depth of 80 cm and their tails should be brought to the surface. The most important consideration during foundation grounding system installation is the use of products and materials compliant with IEC 50164 Standard. Because corrosion risk will increase grounding resistance values in a short time. Therefore, selecting anticorrosive products, ensuring a 70-micron coating level if galvanized conductors are used, using connection elements not thinner than 3 mm, and preferably applying <strong>corrosion tape<\/strong> at every connection point are extremely important.<\/p>\n<div id=\"attachment_5133\" style=\"width: 605px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m.jpg\" rel=\"attachment wp-att-5133\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-5133\" class=\" wp-image-5133\" src=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m.jpg\" alt=\"Power Plant Equipotential Distribution Table\" width=\"595\" height=\"407\" srcset=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m.jpg 1345w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-300x205.jpg 300w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-1024x700.jpg 1024w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-768x525.jpg 768w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-213x146.jpg 213w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-50x34.jpg 50w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-110x75.jpg 110w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/santral-e\u015fda\u011f\u0131t\u0131m-1053x720.jpg 1053w\" sizes=\"auto, (max-width:767px) 480px, 595px\" \/><\/a><p id=\"caption-attachment-5133\" class=\"wp-caption-text\">Power Plant Equipotential Distribution Table<\/p><\/div>\n<p>Making connections using <strong>Exothermic Welding<\/strong> is a more accurate application. Additionally, it is important that all used equipment and connection elements are made of the same type of metal. Using the same material type is essential against bimetal effects. It is not mandatory to use copper in grounding systems. As clearly stated in <strong><em>IEC 62305 standard<\/em><\/strong>, different materials with sufficient cross-sections and dimensions can be used. Galvanized alloy and stainless steel products are ideal, while MgSi alloy conductors are highly resistant to <strong>corrosion<\/strong>. After the foundation grounding design, the placement and design of passive air terminals should be completed, followed by functional grounding at opposite sides of the facility. However, every functional grounding must be connected to the equipotential system using <strong>spark gap<\/strong> arresters. At this stage, design and implementation must be carried out by expert engineers. In PV projects where lightning rods are not recommended, failing to bond lightning rod grounding to the equipotential system poses a significant risk.<\/p>\n<div id=\"attachment_5134\" style=\"width: 536px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi.jpg\" rel=\"attachment wp-att-5134\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-5134\" class=\" wp-image-5134\" src=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi.jpg\" alt=\"Method A Grounding Diagram\" width=\"526\" height=\"327\" srcset=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi.jpg 700w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi-300x186.jpg 300w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi-235x146.jpg 235w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi-50x31.jpg 50w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/topraklama-semasi-121x75.jpg 121w\" sizes=\"auto, (max-width:767px) 480px, 526px\" \/><\/a><p id=\"caption-attachment-5134\" class=\"wp-caption-text\">Method A Grounding Diagram<\/p><\/div>\n<p>In the <a href=\"https:\/\/yilkomer.com\/en\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #ff6600;\"><strong>Lightning Protection<\/strong><\/span><\/a> System, passive air terminals should be preferred and bonded to the equipotential system. The operational and protective grounding resistance values of transformers are extremely important. Transformer protection and operational grounding practices and resistance values are determined by standards, and considering long-term operation, keeping all grounding values below 1 ohm and using corrosion tape are critically important. Grounding of field distribution panels and combiner panels must never be separated; they must be bonded to the equipotential system. This is because lightning, sudden overvoltage, and other fault currents will flow to the panel with the lowest resistance within 25 ns, leading to negative consequences. Therefore, field panels, combiner box grounding, and inverters must benefit from the global grounding system. After all grounding systems are installed and bonded to equipotential, equipotential control and measurements must be performed using calibrated devices within the scope of IEC 62305 standard. Expert engineering supervision is extremely important at this stage. The resistance difference at 100 specified points must not exceed 0.2 ohms. Therefore, measurements at different locations are crucial. However, design, implementation, and differences in soil resistivity around the plant may require different practices. From time to time, intentional low-resistance discharge points may be created in the facility. This should be done in areas with uneven soil resistivity values. Calculations, material selection, implementation, and measurement stages related to grounding must absolutely be performed by experts. Otherwise, it is very difficult for the facility to remain electrically reliable over the long term.<\/p>\n<div id=\"attachment_5135\" style=\"width: 490px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid.png\" rel=\"attachment wp-att-5135\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-5135\" class=\"size-full wp-image-5135\" src=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid.png\" alt=\"Sample Grid Image\" width=\"480\" height=\"360\" srcset=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid.png 480w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid-300x225.png 300w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid-195x146.png 195w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid-50x38.png 50w, https:\/\/yilkomer.com\/wp-content\/uploads\/2016\/03\/grid-100x75.png 100w\" sizes=\"auto, (max-width:767px) 480px, 480px\" \/><\/a><p id=\"caption-attachment-5135\" class=\"wp-caption-text\">Sample Grid Image<\/p><\/div>\n<p>As Lightning Protection Center, we provide all grounding calculations, material selection, implementation, and reporting services for Solar Projects. For more information, you may contact us at <a href=\"mailto:info@yilkomer.com\">info@yilkomer.com<br \/>\n<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Solar projects always require the utmost importance to be given to four-stage protection. After the design of Passive Air Terminals and LV Surge Protection Device design,<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[193],"tags":[],"class_list":["post-53687","post","type-post","status-publish","format-standard","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.2.1 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>The Concept of Grounding and Equipotential Bonding<\/title>\n<meta name=\"description\" content=\"In solar projects, the importance of four-level protection is always very high. 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