{"id":1988,"date":"2026-08-10T14:00:00","date_gmt":"2026-08-10T06:00:00","guid":{"rendered":"https:\/\/shenhengglobal.com\/blog\/ais-vs-gis-switchgear-selection\/"},"modified":"2026-08-27T09:55:54","modified_gmt":"2026-08-27T01:55:54","slug":"ais-vs-gis-switchgear-selection","status":"publish","type":"post","link":"https:\/\/shenhengglobal.com\/vi\/blog\/ais-vs-gis-switchgear-selection\/","title":{"rendered":"AIS so v\u1edbi GIS: C\u00e1ch l\u1ef1a ch\u1ecdn t\u1ee7 \u0111i\u1ec7n cho kh\u00f4ng gian, b\u1ea3o tr\u00ec v\u00e0 ch\u1ebf \u0111\u1ed9 l\u00e0m vi\u1ec7c"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\">Air insulated switchgear (AIS) and gas insulated switchgear (GIS) can both serve medium-voltage distribution. The defensible choice satisfies the project&#8217;s clearances, service method, environment, extension plan and electrical duty. Compare the complete installation, not only cubicle width or price.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Gas-insulated switchgear\" src=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/06\/1.Gas-Insulated-Switchgear.webp\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">See <a href=\"https:\/\/shenhengglobal.com\/vi\/medium-voltage-switchgear\/\">Shenheng Power medium-voltage switchgear<\/a> for the site&#8217;s product families. Keep the single-line diagram and fault study beside this comparison.<\/p>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 id=\"contents\" style=\"margin:42px 0 14px;scroll-margin-top:96px\">M\u1ee5c l\u1ee5c<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"#What-AIS-and-GIS-actually-change\">What AIS and GIS actually change<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#Decide-by-space-and-layout\">Decide by space and layout<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#Compare-maintenance-as-a-work-method\">Compare maintenance as a work method<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#Let-electrical-duty-set-the-gates\">Let electrical duty set the gates<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#RFQ-decision-sheet\">RFQ decision sheet<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#A-switchgear-path-for-constrained-MV-rooms\">A switchgear path for constrained MV rooms<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"What-AIS-and-GIS-actually-change\">What AIS and GIS actually change<\/h2>\n<div class=\"b2b-table-scroll\" role=\"region\" aria-label=\"B\u1ea3ng d\u1eef li\u1ec7u c\u00f3 th\u1ec3 cu\u1ed9n\" tabindex=\"0\" style=\"width:100%;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 18px\">\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Factor<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">AIS<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">GIS<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Boundary<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Insulation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Air clearances in a metal-enclosed assembly<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Enclosed insulated compartments<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Gas type and pressure are model-specific<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Space<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Room for clearances, cable access and service movement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Often selected where the complete footprint is constrained<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Use an approved GA drawing<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">D\u1ecbch v\u1ee5<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Accessible panels or withdrawable parts can simplify work<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Sealed compartments require dedicated procedures<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Exact maintenance depends on design<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Environment<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Room cleanliness, humidity and dust control matter<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Enclosure can help in harsh or compact locations<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Confirm enclosure and site limits<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Extension<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Reserve clearances and busbar space<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Specify modules and interfaces early<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Request an extension concept<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Duty<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Breaker class, interlocks and IAC must match<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">The same duty questions plus compartment documentation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">IEC 62271 and the project study govern<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Ring main unit and medium-voltage switchgear\" src=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/06\/1.Ring-Main-Unit-RMU-MV-Switchgear.webp\" \/><\/figure>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"Decide-by-space-and-layout\">Decide by space and layout<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">GIS is often considered where land or building volume is constrained. Its cubicle width is not the whole footprint: cable boxes, control panels, lifting paths, pressure-relief provisions and maintenance clearances still need space. AIS may need more clearance, while a withdrawable arrangement can make breaker handling easier.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Ask for a GA drawing showing:<\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">front and rear service clearances, aisles and door swings;<\/li>\n<li style=\"margin:0 0 8px\">cable trench, gland-plate and termination space;<\/li>\n<li style=\"margin:0 0 8px\">lifting and removal paths for serviceable parts;<\/li>\n<li style=\"margin:0 0 8px\">bus-section, metering and protection interfaces; and<\/li>\n<li style=\"margin:0 0 8px\">reserved bays for future extension.<\/li>\n<\/ul>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"Compare-maintenance-as-a-work-method\">Compare maintenance as a work method<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">For AIS, define inspection access, cleaning, breaker withdrawal, earthing and interlock proving. For GIS, define compartment access, gas-density or pressure monitoring, approved handling equipment and the boundary between factory and site work.<\/p>\n<ol style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">List outage tasks: inspection, mechanism service, cable testing, relay testing and earthing verification.<\/li>\n<li style=\"margin:0 0 8px\">Mark which tasks require isolation or specialist intervention.<\/li>\n<li style=\"margin:0 0 8px\">Check that room access, lifting equipment, test points, spares and trained personnel support the tasks.<\/li>\n<li style=\"margin:0 0 8px\">Put the method and documentation into the RFQ.<\/li>\n<\/ol>\n<p style=\"margin:0 0 16px;line-height:1.7\">Read <a href=\"https:\/\/shenhengglobal.com\/vi\/blog\/medium-voltage-switchgear-explained-components-functions-and-selection-tips\/\">medium-voltage switchgear components and selection<\/a> and the <a href=\"https:\/\/shenhengglobal.com\/vi\/blog\/kyn28-gas-insulated-switchgear-buyers-guide\/\">KYN28 buyer guide<\/a> when reviewing candidate documents. Where the network concept includes a ring-fed distribution path, use the <a href=\"https:\/\/shenhengglobal.com\/vi\/blog\/ring-main-unit-rmu-selection-guide\/\">RMU selection guide<\/a> to define the separate RMU questions; it does not replace the AIS\/GIS duty and layout review above.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"Let-electrical-duty-set-the-gates\">Let electrical duty set the gates<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">State nominal and highest voltage, normal and emergency load, short-circuit current and duration, making and breaking duty, insulation level, earthing arrangement, internal-arc access category and protection functions. IEC 62271-200 provides the standard context for AC metal-enclosed MV assemblies; the applicable edition belongs in the specification.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">The supplier should return a model-specific schedule covering ratings, type-test evidence, interlocks, cable interfaces, environmental limits and extension boundaries. A GIS label does not remove the need for a fault study, and an AIS label does not prove an internal-arc or breaker duty.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"RFQ-decision-sheet\">RFQ decision sheet<\/h2>\n<ol style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">One-line diagram, voltage, frequency, phase sequence and transformer interface.<\/li>\n<li style=\"margin:0 0 8px\">Load schedule, motor or converter duty, harmonics and future capacity.<\/li>\n<li style=\"margin:0 0 8px\">Fault level, withstand duration, peak withstand and breaker duties.<\/li>\n<li style=\"margin:0 0 8px\">Insulation levels, internal-arc category and environment class.<\/li>\n<li style=\"margin:0 0 8px\">GA constraints, cable entry, trench, lifting route and service aisles.<\/li>\n<li style=\"margin:0 0 8px\">Maintenance philosophy, outage windows, tools, training and spares.<\/li>\n<li style=\"margin:0 0 8px\">Protection, metering, communications, interlocking and testing.<\/li>\n<li style=\"margin:0 0 8px\">Applicable IEC edition, local code and documentation deliverables.<\/li>\n<\/ol>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"A-switchgear-path-for-constrained-MV-rooms\">A switchgear path for constrained MV rooms<\/h2>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Medium-voltage gas-insulated switchgear\" src=\"https:\/\/shenhengglobal.com\/wp-content\/uploads\/2026\/07\/1.Gas-Insulated-Switchgear-1.webp\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">If the room is constrained and the brief points toward a metal-enclosed GIS arrangement, review the <a href=\"https:\/\/shenhengglobal.com\/vi\/product\/customized-gas-insulated-switchgear-kyn28-12-12kv-24kv-switchgear-system\/\">Shenheng customized KYN28-12 switchgear system<\/a>. This is a document-request path, not a blanket recommendation. Send duty, GA constraints, cable arrangement, protection schedule, service philosophy and standards, then request the current datasheet, GA drawing, type-test scope, interlock description and extension plan.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"References\">T\u00e0i li\u1ec7u tham kh\u1ea3o<\/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\/publication\/6046\" rel=\"nofollow noopener\" target=\"_blank\">IEC 62271-200 publication overview<\/a> &#8211; standard scope and MV terminology.<\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.hitachienergy.com\/products-and-solutions\/high-voltage-switchgear-and-breakers\/gas-insulated-switchgear\" rel=\"nofollow noopener\" target=\"_blank\">Hitachi Energy GIS overview<\/a> &#8211; GIS enclosure and lifecycle context.<\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.eaton.com\/us\/en-us\/catalog\/medium-voltage-power-distribution-control-systems\/vacclad-w-metal-clad-switchgear.html\" rel=\"nofollow noopener\" target=\"_blank\">Eaton VacClad-W AIS information<\/a> &#8211; AIS metal-clad architecture.<\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.se.com\/ww\/en\/work\/products\/master-ranges\/medium-voltage-switchgear\/\" rel=\"nofollow noopener\" target=\"_blank\">Schneider Electric medium-voltage switchgear<\/a> &#8211; product-family context.<\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/shenhengglobal.com\/vi\/medium-voltage-switchgear\/\">Shenheng Power medium-voltage switchgear<\/a> &#8211; product pathway.<\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>So s\u00e1nh t\u1ee7 \u0111i\u1ec7n c\u00e1ch \u0111i\u1ec7n b\u1eb1ng kh\u00f4ng kh\u00ed (AIS) v\u00e0 t\u1ee7 \u0111i\u1ec7n c\u00e1ch \u0111i\u1ec7n b\u1eb1ng kh\u00ed (GIS) v\u1ec1 m\u1eb7t kh\u00f4ng gian, kh\u1ea3 n\u0103ng ti\u1ebfp c\u1eadn b\u1ea3o tr\u00ec, t\u00e1c \u0111\u1ed9ng m\u00f4i tr\u01b0\u1eddng v\u00e0 ch\u1ebf \u0111\u1ed9 l\u00e0m vi\u1ec7c \u0111i\u1ec7n tr\u01b0\u1edbc khi g\u1eedi y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ) trung th\u1ebf c\u1ee7a b\u1ea1n.<\/p>","protected":false},"author":1,"featured_media":2048,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1988","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\/vi\/wp-json\/wp\/v2\/posts\/1988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/comments?post=1988"}],"version-history":[{"count":1,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/posts\/1988\/revisions"}],"predecessor-version":[{"id":2029,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/posts\/1988\/revisions\/2029"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/media\/2048"}],"wp:attachment":[{"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=1988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=1988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shenhengglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=1988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}