{"id":26955,"date":"2024-11-12T13:32:21","date_gmt":"2024-11-12T05:32:21","guid":{"rendered":"https:\/\/cnspd.com\/?p=26955"},"modified":"2026-04-13T13:12:57","modified_gmt":"2026-04-13T05:12:57","slug":"comprehensive-guide-to-choosing-surge-protective-devices-spd-part-one","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/guia-completo-para-a-escolha-de-dispositivos-de-protecao-contra-sobretensoes-spd-parte-um\/","title":{"rendered":"Guia completo para a escolha de dispositivos de prote\u00e7\u00e3o contra surtos (SPD) (Parte Um)"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/guia-completo-para-a-escolha-de-dispositivos-de-protecao-contra-sobretensoes-spd-parte-um\/#i-understanding-surge-protective-devices-spd\" >I. Compreender os Dispositivos de Prote\u00e7\u00e3o contra Surtos (DPS)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/guia-completo-para-a-escolha-de-dispositivos-de-protecao-contra-sobretensoes-spd-parte-um\/#ii-determining-protection-needs\" >II. Determina\u00e7\u00e3o das necessidades de prote\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/guia-completo-para-a-escolha-de-dispositivos-de-protecao-contra-sobretensoes-spd-parte-um\/#iii-choosing-the-right-spd\" >III. Escolher o DPS correto<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/guia-completo-para-a-escolha-de-dispositivos-de-protecao-contra-sobretensoes-spd-parte-um\/#iv-key-technical-parameters\" >IV. Par\u00e2metros t\u00e9cnicos fundamentais<\/a><\/li><\/ul><\/nav><\/div>\n<h2 data-start=\"138\" data-end=\"188\"><span class=\"ez-toc-section\" id=\"i-understanding-surge-protective-devices-spd\"><\/span>I. Compreender os Dispositivos de Prote\u00e7\u00e3o contra Surtos (DPS)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"190\" data-end=\"230\">1.1 Defini\u00e7\u00e3o e princ\u00edpio de funcionamento<\/h3>\n<p data-start=\"232\" data-end=\"736\">Os Dispositivos de Prote\u00e7\u00e3o contra Surtos (DPS) protegem o equipamento eletr\u00f3nico contra surtos de tens\u00e3o. Estas sobretens\u00f5es resultam de rel\u00e2mpagos, comuta\u00e7\u00e3o de sistemas ou falhas. Embora breves, eles carregam alta energia. Os SPDs fornecem um caminho de baixa imped\u00e2ncia que direciona com seguran\u00e7a a corrente de surto para o solo. Os padr\u00f5es IEC garantem que os SPDs limitem os surtos a n\u00edveis seguros - normalmente abaixo de 2.5 kV. Os SPDs de alta qualidade reagem em nanossegundos. Escolha SPDs com base nas necessidades do sistema e nas especifica\u00e7\u00f5es t\u00e9cnicas. Essa correspond\u00eancia garante prote\u00e7\u00e3o quando \u00e9 mais importante.<\/p>\n<h3 data-start=\"738\" data-end=\"775\">1.2 Principais tipos e aplica\u00e7\u00f5es de DPS<\/h3>\n<p data-start=\"777\" data-end=\"804\">Os DPS dividem-se em tr\u00eas tipos:<\/p>\n<ul data-start=\"806\" data-end=\"1142\">\n<li data-start=\"806\" data-end=\"907\">\n<p data-start=\"808\" data-end=\"907\"><strong data-start=\"808\" data-end=\"834\">SPDs de comuta\u00e7\u00e3o de tens\u00e3o<\/strong> adaptam-se a linhas de transmiss\u00e3o de alta tens\u00e3o. Actuam rapidamente para travar sobretens\u00f5es fortes.<\/p>\n<\/li>\n<li data-start=\"908\" data-end=\"1007\">\n<p data-start=\"910\" data-end=\"1007\"><strong data-start=\"910\" data-end=\"935\">SPDs limitadores de tens\u00e3o<\/strong> adaptam-se a sistemas de baixa tens\u00e3o. Reduzem as tens\u00f5es de pico em casas e escrit\u00f3rios.<\/p>\n<\/li>\n<li data-start=\"1008\" data-end=\"1142\">\n<p data-start=\"1010\" data-end=\"1142\"><strong data-start=\"1010\" data-end=\"1027\">DUPs combinados<\/strong> misturam ambas as carater\u00edsticas. Utilize-os em locais como hospitais e centros de dados. Garantem uma rea\u00e7\u00e3o r\u00e1pida e prote\u00e7\u00e3o.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1144\" data-end=\"1304\">De acordo com a IEC, \u00e9 necess\u00e1rio avaliar a sensibilidade do sistema e escolher o SPD correto. Um estudo de caso de um hospital mostrou que os SPDs limitadores de tens\u00e3o reduzem as falhas relacionadas a surtos em mais de 70%.<\/p>\n<hr data-start=\"1306\" data-end=\"1309\" \/>\n<h2 data-start=\"1311\" data-end=\"1346\"><span class=\"ez-toc-section\" id=\"ii-determining-protection-needs\"><\/span>II. Determina\u00e7\u00e3o das necessidades de prote\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"1348\" data-end=\"1384\">2.1 Avalia\u00e7\u00e3o da sensibilidade do sistema<\/h3>\n<p data-start=\"1386\" data-end=\"1701\">A sensibilidade do sistema depende da toler\u00e2ncia do dispositivo a picos de tens\u00e3o. Por exemplo, os servidores e os controlos s\u00e3o muito sens\u00edveis. Os motores e a ilumina\u00e7\u00e3o toleram mais. Os padr\u00f5es IEEE categorizam essa sensibilidade. Um data center antes de instalar SPDs sofreu milh\u00f5es em perdas. Voc\u00ea deve avaliar a sensibilidade para escolher o SPD certo.<\/p>\n<h3 data-start=\"1703\" data-end=\"1751\">2.2 Defini\u00e7\u00e3o dos n\u00edveis e normas de prote\u00e7\u00e3o<\/h3>\n<p data-start=\"1753\" data-end=\"2055\">Os n\u00edveis de prote\u00e7\u00e3o s\u00e3o selecionados com base na norma IEC 61643. Os edif\u00edcios residenciais necessitam de n\u00edveis mais baixos. Os sistemas cr\u00edticos necessitam de uma prote\u00e7\u00e3o mais elevada. Uma f\u00e1brica de produtos qu\u00edmicos que seguiu a norma IEC 61643-11 registou uma queda de 70% nas falhas de equipamento. Al\u00e9m disso, verifique as certifica\u00e7\u00f5es UL 1449 e EN 61643. Elas confirmam a conformidade regulamentar local.<\/p>\n<hr data-start=\"2057\" data-end=\"2060\" \/>\n<h2 data-start=\"2062\" data-end=\"2092\"><span class=\"ez-toc-section\" id=\"iii-choosing-the-right-spd\"><\/span>III. Escolher o DPS correto<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"2094\" data-end=\"2130\">3.1 Adequa\u00e7\u00e3o do DUP \u00e0s necessidades do sistema<\/h3>\n<p data-start=\"2132\" data-end=\"2365\">Comece por examinar a sua configura\u00e7\u00e3o el\u00e9ctrica. Para equipamentos sens\u00edveis - como imagiologia hospitalar ou servidores de centros de dados - utilize SPDs com n\u00edveis de prote\u00e7\u00e3o de baixa tens\u00e3o (VPL). A IEC 61643-11 recomenda que o VPL permane\u00e7a abaixo da janela de toler\u00e2ncia do sistema.<\/p>\n<p data-start=\"2367\" data-end=\"2547\">Para ambientes de alta energia, como f\u00e1bricas de produtos qu\u00edmicos, selecione SPDs com correntes de descarga nominal (In) e m\u00e1xima (Imax) adequadas. Certifique-se de que Imax cumpre a corrente de pico m\u00e1xima esperada.<\/p>\n<p data-start=\"2549\" data-end=\"2686\">Os DPS exteriores necessitam de um design robusto - \u00e0 prova de intemp\u00e9ries, resistente \u00e0 corros\u00e3o e ao calor. Isto abrange plataformas offshore ou climas rigorosos.<\/p>\n<h3 data-start=\"2688\" data-end=\"2715\">3.2 Compara\u00e7\u00e3o dos tipos de DOCUP<\/h3>\n<ul data-start=\"2717\" data-end=\"3065\">\n<li data-start=\"2717\" data-end=\"2860\">\n<p data-start=\"2719\" data-end=\"2860\"><strong data-start=\"2719\" data-end=\"2750\">Tipo 1 (comuta\u00e7\u00e3o de tens\u00e3o):<\/strong> Lida com raios diretos. Instalado na entrada de servi\u00e7o. Em gamas de 10 kA a 120 kA, de acordo com a norma IEC 61643-11.<\/p>\n<\/li>\n<li data-start=\"2861\" data-end=\"2958\">\n<p data-start=\"2863\" data-end=\"2958\"><strong data-start=\"2863\" data-end=\"2893\">Tipo 2 (limitador de tens\u00e3o):<\/strong> Concebido para prote\u00e7\u00e3o interna contra sobretens\u00f5es. A entrada \u00e9 tipicamente de 5-40 kA.<\/p>\n<\/li>\n<li data-start=\"2959\" data-end=\"3065\">\n<p data-start=\"2961\" data-end=\"3065\"><strong data-start=\"2961\" data-end=\"2981\">H\u00edbrido\/Combinado:<\/strong> Oferece prote\u00e7\u00e3o de gama completa. Embora mais caro, poupa tempo de inatividade e manuten\u00e7\u00e3o.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3067\" data-end=\"3123\">Equilibrar o custo e o desempenho para garantir a seguran\u00e7a a longo prazo.<\/p>\n<hr data-start=\"3125\" data-end=\"3128\" \/>\n<h2 data-start=\"3130\" data-end=\"3161\"><span class=\"ez-toc-section\" id=\"iv-key-technical-parameters\"><\/span>IV. Par\u00e2metros t\u00e9cnicos fundamentais<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"3163\" data-end=\"3204\">4.1 Tens\u00e3o de funcionamento cont\u00ednuo (Uc)<\/h3>\n<p data-start=\"3206\" data-end=\"3467\">Uc indica a tens\u00e3o mais elevada que o SPD pode suportar sem ser ativado. Para sistemas de 230 VAC, escolha Uc pelo menos 10-20% acima da tens\u00e3o nominal. Os dados da ind\u00fastria mostram que os SPDs subestimados disparam com mais frequ\u00eancia, aumentando a manuten\u00e7\u00e3o. Escolha sabiamente para equilibrar custo e fiabilidade.<\/p>\n<h3 data-start=\"3469\" data-end=\"3495\">4.2 Valores In e Imax<\/h3>\n<ul data-start=\"3497\" data-end=\"3686\">\n<li data-start=\"3497\" data-end=\"3585\">\n<p data-start=\"3499\" data-end=\"3585\"><strong data-start=\"3499\" data-end=\"3534\">Corrente de descarga nominal (In):<\/strong> Corrente cont\u00ednua que o SPD manipula repetidamente.<\/p>\n<\/li>\n<li data-start=\"3586\" data-end=\"3686\">\n<p data-start=\"3588\" data-end=\"3686\"><strong data-start=\"3588\" data-end=\"3625\">Corrente m\u00e1xima de descarga (Imax):<\/strong> A corrente de surto mais alta que o SPD pode tolerar em um evento.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3688\" data-end=\"3700\">Por exemplo:<\/p>\n<ul data-start=\"3701\" data-end=\"3781\">\n<li data-start=\"3701\" data-end=\"3737\">\n<p data-start=\"3703\" data-end=\"3737\">In = 20 kA suporta picos de tens\u00e3o t\u00edpicos.<\/p>\n<\/li>\n<li data-start=\"3738\" data-end=\"3781\">\n<p data-start=\"3740\" data-end=\"3781\">Imax = 40 kA pode suportar casos extremos.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3783\" data-end=\"3948\">A escolha dos valores corretos previne as falhas do equipamento e evita substitui\u00e7\u00f5es desnecess\u00e1rias. O ad\u00e1gio de Franklin \u00e9 v\u00e1lido: \"Uma grama de preven\u00e7\u00e3o vale mais que um quilo de cura\".<\/p>\n<hr data-start=\"3950\" data-end=\"3953\" \/>\n<h3 data-start=\"3955\" data-end=\"3981\">Resumo final (I-IV)<\/h3>\n<p data-start=\"3983\" data-end=\"4009\">Esta sec\u00e7\u00e3o do guia abrange:<\/p>\n<ul data-start=\"4010\" data-end=\"4202\">\n<li data-start=\"4010\" data-end=\"4050\">\n<p data-start=\"4012\" data-end=\"4050\">No\u00e7\u00f5es b\u00e1sicas de DPS: objetivo e funcionamento.<\/p>\n<\/li>\n<li data-start=\"4051\" data-end=\"4085\">\n<p data-start=\"4053\" data-end=\"4085\">Tipos de DUP e onde utiliz\u00e1-los.<\/p>\n<\/li>\n<li data-start=\"4086\" data-end=\"4148\">\n<p data-start=\"4088\" data-end=\"4148\">Avalia\u00e7\u00e3o da sensibilidade do sistema e dos n\u00edveis de prote\u00e7\u00e3o necess\u00e1rios.<\/p>\n<\/li>\n<li data-start=\"4149\" data-end=\"4202\">\n<p data-start=\"4151\" data-end=\"4202\">Especifica\u00e7\u00f5es principais: Uc, In, Imax e sele\u00e7\u00e3o de aplica\u00e7\u00f5es.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4204\" data-end=\"4321\" data-is-last-node=\"\" data-is-only-node=\"\">A pr\u00f3xima sec\u00e7\u00e3o abordar\u00e1 a instala\u00e7\u00e3o, manuten\u00e7\u00e3o, regulamenta\u00e7\u00e3o, economia e estudos de caso.<\/p>\n<h3><a href=\"https:\/\/www.cnspd.com\/pt\/guia-completo-para-a-escolha-de-dispositivos-de-protecao-contra-sobretensoes-spd-parte-dois\/\">Clique para ver a segunda parte do Guia do DPS<\/a><\/h3>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>I. Compreender os Dispositivos de Prote\u00e7\u00e3o contra Surtos (DPS) 1.1 Defini\u00e7\u00e3o e Princ\u00edpio de Funcionamento Os Dispositivos de Prote\u00e7\u00e3o contra Surtos (DPS) protegem o equipamento eletr\u00f3nico contra surtos de tens\u00e3o. Esses surtos resultam de raios, comuta\u00e7\u00e3o do sistema ou falhas. Embora breves, eles carregam alta energia. Os SPDs fornecem um caminho de baixa imped\u00e2ncia que direciona com seguran\u00e7a a corrente de surto para o solo. As normas IEC garantem que os SPDs limitam as sobretens\u00f5es a...<\/p>","protected":false},"author":18,"featured_media":26956,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-26955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Guide to Choosing Surge Protective Devices<\/title>\n<meta name=\"description\" content=\"This blog is about Guide to Choosing Surge Protective Devices . 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