{"id":2861,"date":"2026-08-26T09:18:00","date_gmt":"2026-08-26T09:18:00","guid":{"rendered":"https:\/\/lbajiele.com\/?p=2861"},"modified":"2026-08-25T12:09:58","modified_gmt":"2026-08-25T12:09:58","slug":"air-insulated-medium-voltage-switchgear-guide","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/de\/blog\/air-insulated-medium-voltage-switchgear-guide\/","title":{"rendered":"Luftisolierte Mittelspannungs-Schaltanlagen: Aufbau &amp; Auswahl"},"content":{"rendered":"<p><strong>Air-insulated medium-voltage switchgear uses atmospheric air as the principal insulation between phases and ground while metal compartments contain breakers, buses, instrument transformers, cables and control equipment.<\/strong> AIS is maintainable and familiar but requires more space than sealed alternatives. Selection should be based on rated voltage, insulation level, continuous and short-circuit current, internal-arc strategy, service continuity, environment and maintenance access.<\/p>\n<div class=\"lbaji-key-takeaways\"><h2>Die wichtigsten Erkenntnisse<\/h2><ul><li>Do not select MV switchgear from nominal voltage alone.<\/li><li>Compartmentalization, interlocks and arc classification affect personnel risk and continuity.<\/li><li>Altitude, contamination, condensation and access can change the correct design.<\/li><\/ul><\/div>\n<h2>AIS Construction and Compartments<\/h2><figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Air-insulated switchgear compartments\" loading=\"lazy\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/air-insulated-switchgear-compartments.png\"\/><figcaption>Air-insulated switchgear compartments.<\/figcaption><\/figure>\n<p>A typical metal-clad lineup separates the drawout circuit breaker, main bus, cable terminations and low-voltage controls with grounded metal barriers. Shutters cover primary disconnects when the breaker is withdrawn. Current and voltage transformers supply metering and relays, while grounding switches or trucks support maintenance where specified.<\/p>\n<p>Metal-enclosed switchgear is a broader term and may provide less segregation than metal-clad construction. The project specification should state the construction standard and service requirements instead of relying on marketing names.<\/p>\n<h2>Electrical Ratings That Control Selection<\/h2>\n<p>Rated maximum voltage and power-frequency or impulse withstand must suit the system and insulation coordination. Continuous current applies to the bus and each functional unit. Short-time withstand current and duration describe thermal duty; peak withstand describes electrodynamic force. Breaker interrupting and closing ratings must exceed the studied fault duty.<\/p>\n<p>Frequency, grounding, load type, cable charging, capacitor switching, transformer inrush and motor duty may affect breaker selection. Future fault-level growth should be evaluated rather than hidden by rounding.<\/p>\n<h2>Internal Arc, Interlocks and Service Continuity<\/h2><figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Medium-voltage switchgear factory testing\" loading=\"lazy\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/mv-switchgear-factory-testing.png\"\/><figcaption>Medium-voltage switchgear factory testing.<\/figcaption><\/figure>\n<p>An internal-arc classification states tested accessibility sides, arc current and duration under defined conditions. It is not a guarantee that every possible arc event is harmless. Room relief paths, exhaust ducts, fastening, installation and maintenance condition must match the tested configuration.<\/p>\n<p>Mechanical and electrical interlocks should prevent unsafe operations such as racking a closed breaker, accessing energized compartments or closing onto an improperly positioned earthing switch. Key interlocks must be documented across connected equipment.<\/p>\n<h2>AIS Rating and Construction Checklist<\/h2><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th scope=\"col\">Artikel<\/th><th scope=\"col\">Specify<\/th><th scope=\"col\">Common mistake<\/th><th scope=\"col\">Verifizierung<\/th><\/tr><\/thead><tbody><tr><td>Voltage insulation<\/td><td>Maximum voltage, BIL\/LIWV and power-frequency withstand<\/td><td>Using nominal voltage only<\/td><td>Nameplate and dielectric report<\/td><\/tr><tr><td>Fehlerdienst<\/td><td>Short-time, peak, breaker interrupting and duration<\/td><td>Ignoring future fault growth<\/td><td>Short-circuit study and test certificates<\/td><\/tr><tr><td>Arc performance<\/td><td>Accessibility, current, duration and exhaust arrangement<\/td><td>Treating arc-resistant as universal<\/td><td>Classification report and room design<\/td><\/tr><tr><td>Compartments<\/td><td>Breaker, bus, cable and LV segregation<\/td><td>Assuming all metal-enclosed gear is metal-clad<\/td><td>Construction drawings<\/td><\/tr><tr><td>Umwelt<\/td><td>Altitude, pollution, humidity and temperature<\/td><td>No condensation control<\/td><td>Site data and manufacturer derating<\/td><\/tr><\/tbody><\/table><\/figure>\n<h2>Environment, Maintenance and Factory Tests<\/h2>\n<p>Dust, salt, humidity, condensation, altitude and temperature affect insulation and corrosion. Space heaters, ventilation, filtered rooms or higher creepage may be necessary. Altitude can require insulation or current derating depending on the standard and equipment design.<\/p>\n<p>Routine maintenance includes cleaning, mechanical operation, contact inspection, insulation checks, relay testing and verification of racking and shutters. Factory acceptance should cover dielectric, resistance, mechanical, wiring, protection and functional tests with traceable records.<\/p>\n<h2>Technische Validierung und Sicherheitsgrenze<\/h2><p>Dieser Leitfaden unterst\u00fctzt bei Spezifikation und Beschaffung; er ersetzt weder eine Projektstudie, die geltenden Vorschriften, die Herstelleranweisungen noch die Arbeit von qualifiziertem Elektrofachpersonal. \u00dcberpr\u00fcfen Sie Folgendes vor der Auswahl, Pr\u00fcfung, Verdrahtung oder Inbetriebnahme der Ausr\u00fcstung:<\/p><ul><li>Use the latest short-circuit, load-flow and protection studies.<\/li><li>Confirm cable termination space, bend radius, phase sequence and entry direction.<\/li><li>Coordinate room clearances, pressure relief and emergency egress.<\/li><li>Verify interlocks through a documented functional sequence.<\/li><li>Keep doors, covers and fasteners in the tested condition during service.<\/li><\/ul>\n<h2>Informationen, die in die Angebotsanfrage (RFQ) aufzunehmen sind<\/h2><p>Ein n\u00fctzliches Angebot muss f\u00fcr jeden Lieferanten auf derselben technischen Abgrenzung basieren. F\u00fcgen Sie die folgenden Informationen ein und fordern Sie, dass alle Abweichungen ausdr\u00fccklich aufgef\u00fchrt werden:<\/p><ul><li>System voltage, frequency, grounding and available fault current.<\/li><li>Bus and feeder currents, breaker duties and protection functions.<\/li><li>Construction standard, compartment class and internal-arc requirement.<\/li><li>Indoor\/outdoor environment, altitude, temperature and corrosion exposure.<\/li><li>Single-line, lineup, cable schedule, communication, tests and documentation.<\/li><\/ul>\n<h2>Von technischen Daten zu einer genehmigten Entscheidung<\/h2><p>Use a staged review rather than approving the first catalogue match. Begin with ais construction and compartments, then reconcile electrical ratings that control selection with internal arc, interlocks and service continuity. Complete the review with environment, maintenance and factory tests. At each stage, record the source document, units, operating case and person responsible for approval. This prevents a value copied from an old drawing, nominal system label or unrelated product from becoming an uncontrolled design input.<\/p><p>Vor der Abnahme ist die Lieferantenantwort Zeile f\u00fcr Zeile mit der Anfrage zu vergleichen und jede Abweichung zu kennzeichnen. Es ist zu best\u00e4tigen, dass Zeichnungen, Berechnungen, Einstellungen, Zertifikate und Pr\u00fcfberichte sich auf genau das angebotene Modell und die Revision beziehen. Der genehmigte Einreichungsplan, die Typenschilddaten, die Werksergebnisse und die Inbetriebnahmemessungen sind als Instandhaltungsbasis aufzubewahren. Wenn sich eine Bemessung, ein Anschluss, eine Umgebung oder eine Pr\u00fcfbedingung \u00e4ndert, ist die betroffene Pr\u00fcfung zu wiederholen, anstatt anzunehmen, dass die urspr\u00fcngliche Schlussfolgerung weiterhin g\u00fcltig bleibt.<\/p>\n<p>Die Dokumentenlenkung muss den Revisionsstand, den Freigabestatus und ersetzte Dateien kennzeichnen. Die Teams vor Ort sollten dieselben freigebenden Werte erhalten, die f\u00fcr die Beschaffung verwendet wurden, w\u00e4hrend Inbetriebnahmeprotokolle jede w\u00e4hrend der Installation vorgenommene autorisierte \u00c4nderung erfassen m\u00fcssen. Diese R\u00fcckverfolgbarkeit ist besonders wichtig, wenn Anlagen Jahre sp\u00e4ter ersetzt werden: Der n\u00e4chste Ingenieur ben\u00f6tigt verifizierte Schnittstellen und die Testhistorie und keine unvollst\u00e4ndige Beschreibung, die von einer Bestellung kopiert wurde.<\/p>\n<h2>Durch aktuelle Suchergebnisse fundierte Berichterstattung<\/h2><p>The current U.S. Google top-20 review repeatedly surfaced themes including AIR-INSULATED SWITCHGEAR, Gas-insulated switchgear (GIS) portfolio, What is Medium Voltage Switchgear?, RELATED OFFERING, Live Tank Circuit Breakers (LTB). The article addresses those user needs in an original engineering and procurement sequence; competitor brand navigation and unrelated sales material were excluded.<\/p>\n<h2>Zugeh\u00f6rige LBAJI-Ressourcen<\/h2><p>Weiter mit <a href=\"https:\/\/lbajiele.com\/de\/blog\/complete-guide-to-medium-voltage-switchgear\/\">Mittelspannungs-Schaltanlagen-Handbuch<\/a> <a href=\"https:\/\/lbajiele.com\/de\/blog\/complete-guide-to-gas-air-insulated-switchgear\/\">gas versus air-insulated switchgear<\/a> <a href=\"https:\/\/lbajiele.com\/de\/produktkategorie\/switchgear\/\">LBAJI switchgear products<\/a>. Diese Ressourcen helfen dabei, die Berechnung oder Komponentenentscheidung mit einer vollst\u00e4ndigen Transformator-, Schaltanlagen-, Steuerungs- oder Verteilungsspezifikation zu verkn\u00fcpfen.<\/p>\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list\">\n<\/div>\n<\/div>\n<section class=\"lbaji-technical-references\"><h2>Technische Referenzen und Weiterf\u00fchrende Literatur<\/h2><ul><li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/67180\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">IEC 62271-200<\/a> \u2014 AC metal-enclosed switchgear and internal-arc classification.<\/li><li><a href=\"https:\/\/standards.ieee.org\/\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">IEEE Standards Association<\/a> \u2014 C37 switchgear and circuit-breaker standards.<\/li><li><a href=\"https:\/\/www.osha.gov\/electrical\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">OSHA-Elektrische Sicherheit<\/a> \u2014 Work practices around electrical equipment.<\/li><\/ul><\/section>\n<h2>Fazit<\/h2><p>A sound AIS specification joins electrical ratings, compartment construction, arc strategy, site environment and maintainability. Require the supplier to demonstrate each rating and interface with drawings and test evidence rather than a catalogue description.<\/p>","protected":false},"excerpt":{"rendered":"<p>Luftisolierte Mittelspannungs-Schaltanlagen nutzen atmosph\u00e4rische Luft als Hauptisolierung zwischen den Phasen und Erde, w\u00e4hrend Metallgeh\u00e4use Leistungsschalter, Sammelschienen, Messwandler, Kabel und Steuerger\u00e4te umschlie\u00dfen.<\/p>","protected":false},"author":6,"featured_media":2860,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53],"tags":[76,75,72,69],"class_list":["post-2861","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-switchgear-protection","tag-medium-voltage-switchgear","tag-switchgear","tag-transformer-components","tag-transformer-protection"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/posts\/2861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/comments?post=2861"}],"version-history":[{"count":1,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/posts\/2861\/revisions"}],"predecessor-version":[{"id":3008,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/posts\/2861\/revisions\/3008"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/media\/2860"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/media?parent=2861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/categories?post=2861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/de\/wp-json\/wp\/v2\/tags?post=2861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}