{"id":15240,"date":"2025-11-10T09:10:46","date_gmt":"2025-11-10T08:10:46","guid":{"rendered":"https:\/\/eoc.cat\/?p=15240"},"modified":"2025-11-10T09:10:46","modified_gmt":"2025-11-10T08:10:46","slug":"caiguda-de-tensio-electrica","status":"publish","type":"post","link":"https:\/\/eoc.cat\/ca\/caiguda-de-tensio-electrica\/","title":{"rendered":"Qu\u00e8 \u00e9s la caiguda de tensi\u00f3 el\u00e8ctrica?"},"content":{"rendered":"<p>Una <strong>caiguda de tensi\u00f3 el\u00e8ctrica<\/strong> pot produir-se en qualsevol instal\u00b7laci\u00f3, ja que es tracta d&#8217;un fenomen que <strong>es produeix cada vegada que el corrent circula per un conductor<\/strong>. Aix\u00f2 s\u00ed, en la majoria de casos succeeix de manera imperceptible, per la qual cosa no t\u00e9 cap impacte. Per\u00f2, a vegades, s\u00ed que es poden notar els seus efectes.<\/p>\n<p>Aquest tema \u00e9s rellevant per als nostres estudiants del <a href=\"https:\/\/eoc.cat\/ca\/curs-installador-electricista\/\">curs d&#8217;Instal\u00b7lador Electricista, categoria b\u00e0sica<\/a> i d&#8217;Electricitat General. En aquest article et mostrarem <strong>en qu\u00e8 consisteixen aquestes caigudes de tensi\u00f3 el\u00e8ctrica<\/strong>, per qu\u00e8 es produeixen i quines s\u00f3n les seves conseq\u00fc\u00e8ncies.<\/p>\n<h2>Qu\u00e8 \u00e9s una caiguda de tensi\u00f3?<\/h2>\n<p>Podem definir aquest concepte com la <strong>difer\u00e8ncia de potencial el\u00e8ctric que existeix entre dos punts d&#8217;un mateix circuit<\/strong>. Alguna cosa que succeeix a causa de la resist\u00e8ncia del conductor. I per a aix\u00f2, hem d&#8217;emprar la <strong><a href=\"https:\/\/eoc.cat\/ca\/llei-ohm\/\">llei d&#8217;Ohm<\/a><\/strong>, en la qual s&#8217;explica que la relaci\u00f3 entre tensi\u00f3 (V), intensitat de corrent (I) i resist\u00e8ncia (R) \u00e9s:<\/p>\n<p>V = I \u00d7 R<\/p>\n<p>Per tant, si un conductor, la resist\u00e8ncia del qual coneixem per endavant, transporta un corrent, la tensi\u00f3 en l&#8217;extrem ser\u00e0 m\u00e9s baixa que la que s&#8217;ha subministrat.<\/p>\n<p>Ho veurem amb un exemple:<\/p>\n<ul>\n<li>En una l\u00ednia de coure de 100 metres hi ha una resist\u00e8ncia total de 1,5 \u03a9. El corrent que circula per ella \u00e9s de 16 amperes. De manera que la caiguda de tensi\u00f3 el\u00e8ctrica ser\u00e0 de 24 watts. Aix\u00ed, si la tensi\u00f3 nominal era de 230 watts, en el punt final de la l\u00ednia tan sols hi haur\u00e0 206 V.<\/li>\n<\/ul>\n<h2>Per qu\u00e8 es produeix la caiguda de tensi\u00f3 el\u00e8ctrica?<\/h2>\n<p>Com hem vist en la f\u00f3rmula anterior, \u00e9s <strong>la resist\u00e8ncia<\/strong> la que juga un paper principal en aquest aspecte. Per\u00f2 com varia la resist\u00e8ncia del conductor?<\/p>\n<p>En primer lloc, has de tenir en compte la seva longitud. Com m\u00e9s gran sigui la dist\u00e0ncia, m\u00e9s alta ser\u00e0 la resist\u00e8ncia total. I el mateix ocorre amb la secci\u00f3 del cable. Aix\u00ed, un cable de menor secci\u00f3, tindr\u00e0 una resist\u00e8ncia m\u00e9s alta.<\/p>\n<p>Finalment, el material tamb\u00e9 t\u00e9 una incid\u00e8ncia important. L&#8217;electricitat acostuma a conduir-se per fils de coure perqu\u00e8, encara que no \u00e9s el metall amb menor resistivitat, s\u00ed que \u00e9s m\u00e9s eficient que uns altres de cost similar com l&#8217;alumini.<\/p>\n<p>Per\u00f2 hi ha altres aspectes externs que incideixen en la f\u00f3rmula de la resist\u00e8ncia. I un d&#8217;ells \u00e9s <strong>la temperatura<\/strong>. Quan una l\u00ednia se sotmet a la calor, la caiguda de la tensi\u00f3 \u00e9s major. I el mateix succeeix amb <strong>la intensitat del corrent<\/strong>, l&#8217;altre valor de la f\u00f3rmula que vam veure en l&#8217;anterior apartat. Quan aquesta augmenta, ho fa la caiguda de tensi\u00f3 el\u00e8ctrica.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-15243 size-full\" title=\"tensi\u00f3 el\u00e8ctrica\" src=\"https:\/\/eoc.cat\/wp-content\/uploads\/2025\/11\/tension-electrica.webp\" alt=\"tensi\u00f3 el\u00e8ctrica \" width=\"1080\" height=\"720\" srcset=\"https:\/\/eoc.cat\/wp-content\/uploads\/2025\/11\/tension-electrica.webp 1080w, https:\/\/eoc.cat\/wp-content\/uploads\/2025\/11\/tension-electrica-980x653.webp 980w, https:\/\/eoc.cat\/wp-content\/uploads\/2025\/11\/tension-electrica-480x320.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1080px, 100vw\" \/><\/p>\n<h2>Conseq\u00fc\u00e8ncies d&#8217;una caiguda de tensi\u00f3 el\u00e8ctrica<\/h2>\n<p>Normalment,<strong> la xarxa el\u00e8ctrica est\u00e0 preparada per a assumir petites caigudes o pics de tensi\u00f3<\/strong>. Per\u00f2 en casos m\u00e9s greus, sobretot quan aquesta \u00e9s superior a un 5 % de la tensi\u00f3 nominal, es poden produir fallades en equips sensibles, com a ordenadors, ECU, etc. Tamb\u00e9 \u00e9s habitual notar parpellejos en la il\u00b7luminaci\u00f3 o fins i tot que arribin a saltar les proteccions del quadre.<\/p>\n<p>Si tenim en compte el que diu el <strong>REBT<\/strong> (Reglament El\u00e8ctric de Baixa Tensi\u00f3), el m\u00e0xim admissible des del quadre fins al final de la l\u00ednia m\u00e9s allunyada d&#8217;aquest no ha de superar el 4 %.<\/p>\n<h2>Com solucionar els problemes de tensi\u00f3 el\u00e8ctrica?<\/h2>\n<p>Si tens en compte les causes que t&#8217;hem explicat perqu\u00e8 es produeixi aquest fenomen, un dels m\u00e8todes m\u00e9s fiables per a reduir la caiguda de tensi\u00f3 el\u00e8ctrica \u00e9s incrementar la secci\u00f3 del conductor. Aix\u00ed, passar de 1,5 a 2,5 mm o de 2,5 a 4 mm pot posar fi al problema.<\/p>\n<p>Per\u00f2 si aix\u00f2 no \u00e9s suficient, potser \u00e9s necessari replantejar la instal\u00b7laci\u00f3 per a buscar f\u00f3rmules que permetin <strong>escur\u00e7ar la dist\u00e0ncia entre el quadre i la presa de corrent<\/strong>.<\/p>\n<p>D&#8217;altra banda, si fins i tot amb els m\u00e8todes anteriors persisteix el problema, potser \u00e9s convenient <strong>revisar les connexions el\u00e8ctriques<\/strong>. Quan hi ha contactes fluixos o amb corrosi\u00f3, s&#8217;est\u00e0 limitant la secci\u00f3 \u00fatil de cable. I aix\u00f2 pot tamb\u00e9 augmentar la resist\u00e8ncia. Estr\u00e8nyer b\u00e9 tots els terminals pot solucionar la fallada.<\/p>\n<p>En grans instal\u00b7lacions, com per exemple en grans f\u00e0briques o en terrenys agr\u00edcoles de diverses hect\u00e0rees, \u00e9s necessari prendre mesures addicionals. Com, per exemple, amb la <strong>instal\u00b7laci\u00f3 de transformadors<\/strong>. En implementar-los, s&#8217;aconsegueix recuperar la tensi\u00f3 \u00f2ptima per a evitar que les caigudes danyin els sistemes el\u00e8ctrics.<\/p>\n<p>Encara que la caiguda de la tensi\u00f3 el\u00e8ctrica no es pot evitar, s\u00ed que existeixen mesures preventives i correctives que poden prendre&#8217;s perqu\u00e8 no es produeixin danys. Com a t\u00e8cnic, totes les teves instal\u00b7lacions han de complir amb l&#8217;estipulat en el REBT, per la qual cosa has de dur a terme el <strong>c\u00e0lcul de la caiguda de tensi\u00f3 el\u00e8ctrica estimada<\/strong> tenint en compte totes les variables.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Una caiguda de tensi\u00f3 el\u00e8ctrica pot produir-se en qualsevol instal\u00b7laci\u00f3, ja que es tracta d&#8217;un fenomen que es produeix cada vegada que el corrent circula per un conductor. Aix\u00f2 s\u00ed, en la majoria de casos succeeix de manera imperceptible, per la qual cosa no t\u00e9 cap impacte. Per\u00f2, a vegades, s\u00ed que es poden notar [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":15242,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[81],"tags":[82],"class_list":["post-15240","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electricitat-general","tag-electricitat-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu\u00e8 \u00e9s la caiguda de tensi\u00f3 el\u00e8ctrica? | EOC formaci\u00f3<\/title>\n<meta name=\"description\" content=\"Una caiguda de tensi\u00f3 el\u00e8ctrica pot produir-se en qualsevol instal\u00b7laci\u00f3. 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