{"id":6335,"date":"2021-10-11T03:27:54","date_gmt":"2021-10-11T01:27:54","guid":{"rendered":"https:\/\/www.mdresistor.com\/gridex-n-f\/"},"modified":"2021-10-11T03:27:58","modified_gmt":"2021-10-11T01:27:58","slug":"gridex-n-f","status":"publish","type":"post","link":"https:\/\/www.mdresistor.com\/en\/gridex-n-f\/","title":{"rendered":"GRIDEX N &amp; F"},"content":{"rendered":"<p style=\"text-align: center;\"><img decoding=\"async\" style=\"border: 0px;\" title=\"Gridexnf\" src=\"https:\/\/www.mdresistor.com\/images-docs-blog\/gridexnf.jpg\" alt=\"Gridexnf\"><\/p>\n<h2>PRESENTATION<\/h2>\n<p style=\"text-align: justify;\">The<strong> Gridex N<\/strong> (<strong> natural convection<\/strong> ) and<strong> Gridex F<\/strong> (<strong> forced ventilation<\/strong> ) use<strong> grids<\/strong> of<strong> expanded metal<\/strong> as <strong>resistive<\/strong>elements . These grids include a <strong>deployed<\/strong> part (the <strong>resistive<\/strong> ) and two solid bands (one at each end) for mounting and<strong> connection<\/strong> .<\/p>\n<h3>DESIGN OF THE ELEMENTS<\/h3>\n<p><strong>MESH TYPE<\/strong><br \/>\nThere are two types of basic <strong>mesh<\/strong> :<br \/>\n<strong>Open mesh<\/strong> : for the weakest<strong> ohmic values<\/strong><br \/>\n<strong>Closed mesh<\/strong> : for high ohmic values<\/p>\n<p><strong>Resistant elements<\/strong> :<\/p>\n<p>two basic products: plane elements or C elements. The choice of element type is based on the value of<strong> resistance<\/strong> , the<strong> energy<\/strong> to dissipate and mechanical rigidity.<\/p>\n<p><strong>Assembly of resistive elements<\/strong> :<\/p>\n<p>the<strong> resistive elements<\/strong> are<strong> stacked<\/strong> on the<strong> stainless-steel threaded rods<\/strong> , the<strong> connection<\/strong> between elements is done by <strong>spot-welding<\/strong> each point.<\/p>\n<p><strong>Insulation<\/strong> :<\/p>\n<p>insulation between<strong> resistive elements<\/strong> themselves and the rods is ensured either by<strong> ceramics<\/strong> for standard uses, or by<strong> tubes<\/strong> and<strong> washers<\/strong> in<strong> mica<\/strong> when the<strong> resistance<\/strong> is subjected to strong<strong> vibrations<\/strong> (<strong> railway traction resistor<\/strong> ).<\/p>\n<p><strong>Heat dissipation<\/strong> :<\/p>\n<p>the <strong>expanded metal<\/strong> <strong>resistive<\/strong>elements of offer an optimal surface for<strong>dissipation<\/strong> either by <strong>natural convection<\/strong> , or by<strong> forced convection<\/strong> .<\/p>\n<p><strong>Resistance precision<\/strong> :<\/p>\n<p>the geometry of resistive expanded metal elements and the variety of meshes allow us to obtain<strong>resistive elements<\/strong> with great precision in <strong>ohmic value.<\/strong><\/p>\n<p><strong>Flexibility<\/strong> : the use of expanded metal elements allows in most cases to adapt to restricted spaces and optimize weight.<\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" style=\"border: 0px;\" title=\"Gridexft2\" src=\"https:\/\/www.mdresistor.com\/images-docs-blog\/gridexft2.gif\" alt=\"Gridexft2\"><\/p>\n<h2>USES<\/h2>\n<ul>\n<li><strong>Dynamic braking<\/strong> (<strong> forced ventilation<\/strong> or<strong> natural<\/strong> )<\/li>\n<li><strong>Connection<\/strong> to <strong>earth <\/strong>for <strong>high tension<\/strong><\/li>\n<li><strong>Harmonics filtering<\/strong> of<strong> strong power<\/strong><\/li>\n<li><strong>Load<\/strong><strong>banks<\/strong><\/li>\n<li><strong>Drying<\/strong><\/li>\n<\/ul>\n<h2>ALLOYS<\/h2>\n<p>The different types of alloy used are:<br \/>\n<strong>Ferritic steel<\/strong> &#8211;<strong> AISI 304<\/strong> &#8211;<strong> 18\/10 stainless steel<\/strong> &#8211;<strong> Refractory steel<\/strong> &#8211;<strong> Cupro-Nickel Alloy<\/strong> &#8211;<strong> Aluchrome<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>PRESENTATION The Gridex N ( natural convection ) and Gridex F ( forced ventilation ) use grids of expanded metal as resistiveelements . These grids  [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[195,192,190,189,191,193],"tags":[],"class_list":["post-6335","post","type-post","status-publish","format-standard","hentry","category-braking-resistor","category-filter-resistance","category-les-technologies-de-metal-deploye-resistor-en","category-motor-control","category-resistance-de-charge-en","category-resistance-de-mise-a-la-terre-ngr-ner-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GRIDEX N &amp; F<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mdresistor.com\/en\/gridex-n-f\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GRIDEX N &amp; F\" \/>\n<meta property=\"og:description\" content=\"PRESENTATION The Gridex N ( natural convection ) and Gridex F ( forced ventilation ) use grids of expanded metal as resistiveelements . 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