{"id":8764,"date":"2018-02-02T15:35:30","date_gmt":"2018-02-02T15:35:30","guid":{"rendered":"https:\/\/www.apen.es\/?page_id=8764"},"modified":"2025-07-14T11:10:39","modified_gmt":"2025-07-14T11:10:39","slug":"sai","status":"publish","type":"page","link":"https:\/\/www.apen.es\/ca\/glosario-de-informatica\/sai\/","title":{"rendered":"SAI"},"content":{"rendered":"

QU\u00c8 \u00c9S UN SAI?<\/h2>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n

Un SAI acr\u00f2nim de Sistema d'Alimentaci\u00f3 Ininterrompuda tamb\u00e9 conegut com a UPS en angl\u00e8s, \u00e9s un dispositiu que permet assegurar el funcionament correcte d'un equip quan falla el subministrament el\u00e8ctric. Protegeix els dispositius que estan connectats al corrent el\u00e8ctric i sostenir-los en funcionament durant un temps limitat quan hi ha talls breus de corrent, que poden ser produ\u00efts per una disminuci\u00f3 de voltatge, sobre tensi\u00f3 baixada de ploms\u2026<\/p>\n\n\n\n

Aix\u00f2 \u00e9s degut gr\u00e0cies a la utilitzaci\u00f3 duna bateria que quan detecta la p\u00e8rdua delectricitat sactiva, tenint el temps necessari per poder emmagatzemar les nostres dades i seguir en funcionament mentre se soluciona el problema.<\/p>\n\n\n\n

Caracter\u00edstiques d'un SAI<\/strong><\/p>\n\n\n\n

Un SAI t\u00e9 una mida similar al d'un ordinador petit, cont\u00e9 una \u00e0mplia bateria que li fa tenir un pes m\u00e9s elevat que el del mateix ordinador. Quan les connexions la majoria de models utilitzen entrades d'alimentaci\u00f3 IEC que s\u00f3n diferents a les preses de corrent normalment dom\u00e8stics els SCHUCKO.<\/p>\n\n\n\n

Problemes que et soluciona un SAI<\/strong><\/p>\n\n\n\n

    \n
  • Pujades o baixades de tensi\u00f3: Unes pujades superiors al 110% o una baixada per sota del 85%<\/li>\n\n\n\n
  • Tall de subministrament: <\/strong>Possible problema el\u00e8ctric extern que sol ser extern a causa de reparacions als voltants.<\/li>\n\n\n\n
  • Soroll el\u00e8ctric<\/strong>: Canvi del voltatge que pot afectar els dispositius que estan connectats al corrent<\/li>\n<\/ul>\n\n\n\n

    Classes de SAI<\/strong><\/p>\n\n\n\n

    Trobem tres tipus de SAI, cadascun proporciona diferents funcions, podem distingir entre ells:<\/p>\n\n\n\n

      \n
    • Off-line<\/strong>: \u00c9s el model m\u00e9s senzill, cada vegada s'utilitza menys aix\u00f2 \u00e9s perqu\u00e8 manca de menys funcions que els altres, no t\u00e9 protecci\u00f3 si hi ha una variaci\u00f3 de tensi\u00f3, per tant, actualment no es recomana. En cas de fallada el\u00e8ctrica l'aparell comen\u00e7a a generar la seva pr\u00f2pia alimentaci\u00f3, hi ha un petit moment uns mil\u00b7lisegons que no hi ha electricitat, aix\u00f2 suposa un risc per a dispositius m\u00e9s delicats.<\/li>\n\n\n\n
    • In-line<\/strong>: Aquest model \u00e9s m\u00e9s complet que l'anterior, \u00e9s un dels m\u00e9s utilitzats pel fet que disposa de filtres que cobreixen gran part dels problemes, des de la pujada o baixada de tensions fins als sorolls. Comencen a generar el seu propi subministrament el\u00e8ctric en cas que falli el corrent. Proporciona una protecci\u00f3 b\u00e0sica a un preu assequible. Recomanat per a ordinadors, servidors, dispositius mitjans i petits.<\/li>\n\n\n\n
    • On-line: <\/strong>\u00c9s el dispositiu m\u00e9s complet. \u00c9s un model pensat per a servidors que estiguin funcionant tot el dia, els quals necessiten la m\u00e0xima estabilitat i seguretat. Les bateries es carreguen alhora que es genera l'alimentaci\u00f3. En cas de fallada no hi ha temps de commutaci\u00f3. El principal inconvenient \u00e9s que les bateries no paren de treballar aix\u00f2 porta com a conseq\u00fc\u00e8ncia una substituci\u00f3 m\u00e9s freq\u00fcent.<\/li>\n<\/ul>\n\n\n\n

      Un aspecte molt important per a l'elecci\u00f3 d'un SAI \u00e9s tenir coneixement del consum dels dispositius amb qu\u00e8 aniran connectats per poder saber la pot\u00e8ncia necess\u00e0ria que es requerir\u00e0 per poder sostenir aquests dispositius, \u00e9s a dir, quants watts reals es necessitessin en conjunt per funcionar. A partir d'all\u00e0 podrem escollir el SAI amb la pot\u00e8ncia correcta, aix\u00f2 s\u00ed, sempre deixant un 15-20% de marge.<\/p>","protected":false},"excerpt":{"rendered":"

      \u00bfQUE \u00c9S UN SAI? Un SAI acr\u00f3nimo de Sistema de Alimentaci\u00f3n Ininterrumpida tambi\u00e9n conocido como UPS en ingl\u00e9s, es un dispositivo que permite asegurar el correcto funcionamiento de un equipo cuando falla el suministro el\u00e9ctrico. Protege los dispositivos que est\u00e1n conectados a la corriente el\u00e9ctrica y sostenerlos en funcionamiento durante un tiempo limitado cuando hay…<\/p>","protected":false},"author":4,"featured_media":0,"parent":6185,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-landing-glosario.php","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-8764","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nSAI - Apen Inform\u00e1tica<\/title>\n<meta name=\"description\" content=\"Un SAI tambi\u00e9n conocido como UPS, es un dispositivo que permite asegurar el correcto funcionamiento de un equipo cuando falla el suministro el\u00e9ctrico.\" \/>\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.apen.es\/ca\/glossari-dinformatica\/sai\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SAI - 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