{"id":1566,"date":"2026-07-08T16:41:14","date_gmt":"2026-07-08T08:41:14","guid":{"rendered":"https:\/\/shenhengglobal.com\/?p=1566"},"modified":"2026-08-08T16:10:54","modified_gmt":"2026-08-08T08:10:54","slug":"medium-voltage-switchgear-explained-components-functions-and-selection-tips","status":"publish","type":"post","link":"https:\/\/shenhengglobal.com\/fr\/blog\/medium-voltage-switchgear-explained-components-functions-and-selection-tips\/","title":{"rendered":"Appareillage de commutation moyenne tension : composants et s\u00e9lection"},"content":{"rendered":"<p style=\"margin: 0 0 16px; line-height: 1.7;\">Un clair <code>appareillage de commutation moyenne tension<\/code> la d\u00e9cision commence par la conception de r\u00e9seau approuv\u00e9e, et non par une sp\u00e9cification de catalogue isol\u00e9e. Ce guide permet de centrer l'article sur les questions du projet qui d\u00e9terminent un p\u00e9rim\u00e8tre viable et renvoie les d\u00e9cisions plus sp\u00e9cifiques vers des articles techniques connexes.<\/p>\n<nav class=\"b2b-toc\" style=\"background: #f5f8fa; padding: 16px 20px; border-radius: 8px; margin: 0 0 24px;\">\n<h2 style=\"margin: 42px 0 14px;\" id=\"Contents\">Contenu<\/h2>\n<ul style=\"margin: 0 0 18px 1.2em; line-height: 1.7;\">\n<li style=\"margin: 0 0 8px;\"><a href=\"#Part-1.-Use-the-one-line-diagram-to-define-the-duty\">Part 1. Use the one-line diagram to define the duty<\/a><\/li>\n<li style=\"margin: 0 0 8px;\"><a href=\"#Part-2.-Understand-the-components-as-one-coordinated-system\">Part 2. Understand the components as one coordinated system<\/a><\/li>\n<li style=\"margin: 0 0 8px;\"><a href=\"#Part-3.-Choose-the-insulation-and-construction-for-the-installation\">Part 3. Choose the insulation and construction for the installation<\/a><\/li>\n<li style=\"margin: 0 0 8px;\"><a href=\"#Part-4.-Separate-protection-design-from-hardware-selection\">Part 4. Separate protection design from hardware selection<\/a><\/li>\n<li style=\"margin: 0 0 8px;\"><a href=\"#Part-5.-Make-factory-and-handover-records-Part-of-procurement\">Part 5. Make factory and handover records part of procurement<\/a><\/li>\n<li style=\"margin: 0 0 8px;\"><a href=\"#Part-6.-Use-the-product-page-for-initial-scope-alignment\">Part 6. Use the product page for initial scope alignment<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 id=\"Part-1.-Use-the-one-line-diagram-to-define-the-duty\" style=\"margin: 42px 0 14px;\">Part 1. Use the one-line diagram to define the duty<\/h2>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Medium-voltage switchgear is an assembly that switches, protects, isolates, and controls circuits above low-voltage distribution levels. Selection starts with the system voltage, earthing method, continuous current, prospective short-circuit current, feeder roles, and operating philosophy. A voltage label alone does not establish the required assembly duty.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1638 aligncenter\" src=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/07\/1.Gas-Insulated-Switchgear-1.webp\" alt=\"Appareillage de commutation moyenne tension : composants et s\u00e9lection\" width=\"750\" height=\"750\" srcset=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/07\/1.Gas-Insulated-Switchgear-1.webp 750w, https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/07\/1.Gas-Insulated-Switchgear-1-300x300.webp 300w, https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/07\/1.Gas-Insulated-Switchgear-1-150x150.webp 150w, https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/07\/1.Gas-Insulated-Switchgear-1-500x500.webp 500w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<h2 id=\"Part-2.-Understand-the-components-as-one-coordinated-system\" style=\"margin: 42px 0 14px;\">Part 2. Understand the components as one coordinated system<\/h2>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Typical sections combine busbars, circuit breakers or load-break switches, disconnecting and earthing functions, instrument transformers, protection relays, cable compartments, and interlocks. Their ratings and clearances must be coordinated. The equipment schedule should state what is included in each incomer, feeder, bus section, and metering panel.<\/p>\n<h2 id=\"Part-3.-Choose-the-insulation-and-construction-for-the-installation\" style=\"margin: 42px 0 14px;\">Part 3. Choose the insulation and construction for the installation<\/h2>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Air-insulated, gas-insulated, and metal-clad designs solve different footprint, environmental, and maintenance problems. Indoor rooms require attention to access, cable routing, ventilation, and safety clearances. Outdoor or compact installations add enclosure and environmental considerations. Confirm the actual construction in approved drawings rather than inferring it from a generic category name.<\/p>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\"><img decoding=\"async\" style=\"max-width: 640px; width: 100%; height: auto; display: block; margin: 0 auto; border-radius: 8px;\" src=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/06\/1768975312147538.webp\" alt=\"Project planning for medium voltage switchgear\" \/><\/p>\n<h2 id=\"Part-4.-Separate-protection-design-from-hardware-selection\" style=\"margin: 42px 0 14px;\">Part 4. Separate protection design from hardware selection<\/h2>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Relays, CTs, VTs, breaker operating times, and the protection philosophy must be aligned with the network study. Protection settings are not universal values that can be copied between projects. Coordinate them with upstream utility equipment and downstream transformers or feeders before commissioning.<\/p>\n<h2 id=\"Part-5.-Make-factory-and-handover-records-Part-of-procurement\" style=\"margin: 42px 0 14px;\">Part 5. Make factory and handover records part of procurement<\/h2>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Ask for approved GA drawings, wiring diagrams, nameplate information, routine-test records, relay documentation, and operation instructions. Factory tests should be witnessed or reviewed according to the contract. Site commissioning then verifies cable identification, interlocks, earthing, protection logic, and the latest settings file.<\/p>\n<h2 id=\"Part-6.-Use-the-product-page-for-initial-scope-alignment\" style=\"margin: 42px 0 14px;\">Part 6. Use the product page for initial scope alignment<\/h2>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">For 12kV or 24kV project discussions, the published <a href=\"https:\/\/shenhengglobal.com\/fr\/product\/ensemble-dappareillage-de-commutation-blinde-au-gaz-personnalise-kyn28-12-12kv-24kv\/\">Tableau de moyenne tension KYN28-12<\/a> can provide a catalog starting point. Product recommendation boundary: fault duty, internal-arc requirements, relay scheme, and utility interfaces must be confirmed by project engineering.<\/p>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Pour une lecture d\u00e9taill\u00e9e et connexe, voir <a href=\"https:\/\/shenhengglobal.com\/fr\/blog\/kyn28-gas-insulated-switchgear-buyers-guide\/\">KYN28 Gas Insulated Switchgear Buyer Guide<\/a> et <a href=\"https:\/\/shenhengglobal.com\/fr\/blog\/ring-main-unit-rmu-selection-guide\/\">Guide de s\u00e9lection des tableaux modulaires<\/a> et <a href=\"https:\/\/shenhengglobal.com\/fr\/blog\/11kv-vacuum-circuit-breaker-selection-guide\/\">11kV Vacuum Circuit Breaker Selection<\/a>. Examinez la situation dans son ensemble <a href=\"https:\/\/shenhengglobal.com\/fr\/appareillage-de-commutation-moyenne-tension\/\">Cat\u00e9gorie Shenheng Power<\/a> lors de la comparaison des familles de catalogues, et transmettez les intrants du projet approuv\u00e9s <a href=\"https:\/\/shenhengglobal.com\/fr\/contactez-nous\/\">Contacter Shenheng Power<\/a> pour une discussion technique.<\/p>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\"><img decoding=\"async\" style=\"max-width: 640px; width: 100%; height: auto; display: block; margin: 0 auto; border-radius: 8px;\" src=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/06\/1768975387463485.webp\" alt=\"Documentation review for medium voltage switchgear\" \/><\/p>\n<h2 style=\"margin: 42px 0 14px;\" id=\"FAQ\">FAQ<\/h2>\n<h3 style=\"margin: 28px 0 12px;\">What does medium voltage switchgear do?<\/h3>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">It switches, protects, isolates, and controls medium-voltage circuits according to the system design.<\/p>\n<h3 style=\"margin: 28px 0 12px;\">What should be defined before requesting a quotation?<\/h3>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Provide voltage, current, fault duty, insulation level, feeder schedule, protection requirements, site conditions, and required documentation.<\/p>\n<h3 style=\"margin: 28px 0 12px;\">How are AIS and GIS selection decisions made?<\/h3>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Compare footprint, environment, maintenance approach, project standards, and the required electrical duty rather than choosing by label alone.<\/p>\n<h3 style=\"margin: 28px 0 12px;\">Why are interlocks important?<\/h3>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">They support safe operating sequences, but the required interlock scheme must match the approved single-line diagram and operating procedure.<\/p>\n<h3 style=\"margin: 28px 0 12px;\">What documents are needed before commissioning?<\/h3>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Use the approved drawings, test records, relay settings, cable schedule, manuals, and commissioning procedure.<\/p>\n<h3 style=\"margin: 28px 0 12px;\">When should an RMU be considered instead of a larger lineup?<\/h3>\n<p style=\"margin: 0 0 16px; line-height: 1.7;\">Use the network layout, feeder functions, protection needs, and site constraints to determine whether an RMU is appropriate.<\/p>\n<h2 style=\"margin: 42px 0 14px;\" id=\"References\">R\u00e9f\u00e9rences<\/h2>\n<ul style=\"margin: 0 0 18px 1.2em; line-height: 1.7;\">\n<li style=\"margin: 0 0 8px;\"><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">publications de la CEI<\/a><\/li>\n<li style=\"margin: 0 0 8px;\"><a href=\"https:\/\/standards.ieee.org\/\" rel=\"nofollow noopener\" target=\"_blank\">Association des normes IEEE<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A clear medium voltage switchgear decision begins with the approved network design, not an isolated catalog specification. This guide keeps the article focused on the project questions that determine a workable scope and directs narrower decisions to related technical articles. Contents Part 1. Use the one-line diagram to define the duty Part 2. Understand the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1641,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"acf":[],"_links":{"self":[{"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/posts\/1566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/comments?post=1566"}],"version-history":[{"count":5,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/posts\/1566\/revisions"}],"predecessor-version":[{"id":1643,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/posts\/1566\/revisions\/1643"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/media\/1641"}],"wp:attachment":[{"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/media?parent=1566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/categories?post=1566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shenhengglobal.com\/fr\/wp-json\/wp\/v2\/tags?post=1566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}