{"id":27892,"date":"2025-08-12T13:24:14","date_gmt":"2025-08-12T05:24:14","guid":{"rendered":"https:\/\/cnspd.com\/?p=27892"},"modified":"2026-04-10T13:32:16","modified_gmt":"2026-04-10T05:32:16","slug":"protecting-rs232-ports-from-surge-electric-damage-in-us-industrial-networks","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/protecao-das-portas-rs232-contra-danos-causados-por-sobretensoes-electricas-nas-redes-industriais-dos-eua\/","title":{"rendered":"Prote\u00e7\u00e3o das portas RS232 contra danos causados por sobretens\u00f5es el\u00e9ctricas nas redes industriais dos EUA"},"content":{"rendered":"<p>Em todos os Estados Unidos, os incidentes com sobretens\u00f5es el\u00e9ctricas continuam a ser uma das principais causas de falha do equipamento industrial. Desde parques e\u00f3licos no Texas a sistemas de sinaliza\u00e7\u00e3o de metro em Nova Iorque, as linhas de comunica\u00e7\u00e3o RS232 s\u00e3o frequentemente os pontos fracos escondidos nas redes de automa\u00e7\u00e3o. A NOAA relata que estados como a Fl\u00f3rida, Louisiana e Mississippi registam algumas das frequ\u00eancias de queda de raios mais elevadas do mundo, tornando as medidas de prote\u00e7\u00e3o inegoci\u00e1veis.<\/p>\n<h3 data-start=\"789\" data-end=\"843\"><strong data-start=\"793\" data-end=\"841\">Porque \u00e9 que as interfaces RS232 falham sem prote\u00e7\u00e3o<\/strong><\/h3>\n<p data-start=\"844\" data-end=\"999\">As portas seriais RS232 operam em baixas tens\u00f5es (tipicamente \u00b112V), tornando-as altamente sens\u00edveis a sobretens\u00f5es transit\u00f3rias. Nos EUA, as sobretens\u00f5es podem ter origem em:<\/p>\n<ul data-start=\"1000\" data-end=\"1173\">\n<li data-start=\"1000\" data-end=\"1044\">\n<p data-start=\"1002\" data-end=\"1044\">Impulsos electromagn\u00e9ticos induzidos por rel\u00e2mpagos<\/p>\n<\/li>\n<li data-start=\"1045\" data-end=\"1082\">\n<p data-start=\"1047\" data-end=\"1082\">Opera\u00e7\u00f5es de comuta\u00e7\u00e3o da rede de servi\u00e7os p\u00fablicos<\/p>\n<\/li>\n<li data-start=\"1083\" data-end=\"1132\">\n<p data-start=\"1085\" data-end=\"1132\">Defeito de liga\u00e7\u00e3o \u00e0 terra em instala\u00e7\u00f5es com v\u00e1rios edif\u00edcios<\/p>\n<\/li>\n<li data-start=\"1133\" data-end=\"1173\">\n<p data-start=\"1135\" data-end=\"1173\">Alimenta\u00e7\u00e3o do gerador ap\u00f3s cortes de energia<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1175\" data-end=\"1335\">De acordo com o IEEE Std C62.41, picos transit\u00f3rios t\u00e3o baixos quanto 500V podem destruir transceptores RS232 - muito abaixo da tens\u00e3o produzida at\u00e9 mesmo por rel\u00e2mpagos distantes.<\/p>\n<p data-start=\"1175\" data-end=\"1335\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-26994\" src=\"https:\/\/cnspd.com\/wp-content\/uploads\/2024\/12\/BookCover-3.jpg\" alt=\"Protetor contra picos de tens\u00e3o RS232\" width=\"600\" height=\"408\" srcset=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2024\/12\/BookCover-3.jpg 600w, https:\/\/www.cnspd.com\/wp-content\/uploads\/2024\/12\/BookCover-3-150x102.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<hr data-start=\"1337\" data-end=\"1340\" \/>\n<h3 data-start=\"1342\" data-end=\"1400\"><strong data-start=\"1346\" data-end=\"1398\">LEEYEE Protetor contra picos de tens\u00e3o RS232 para aplica\u00e7\u00f5es nos EUA<\/strong><\/h3>\n<p data-start=\"1401\" data-end=\"1471\">Para sistemas baseados nos EUA, o <strong data-start=\"1427\" data-end=\"1459\">Protetor contra picos de tens\u00e3o LEEYEE RS232<\/strong> fornece:<\/p>\n<ul data-start=\"1472\" data-end=\"1719\">\n<li data-start=\"1472\" data-end=\"1525\">\n<p data-start=\"1474\" data-end=\"1525\"><strong data-start=\"1474\" data-end=\"1487\">Imax 20kA<\/strong> capacidade para tempestades extremas no Midwest<\/p>\n<\/li>\n<li data-start=\"1526\" data-end=\"1584\">\n<p data-start=\"1528\" data-end=\"1584\"><strong data-start=\"1528\" data-end=\"1550\">Tempo de resposta &lt;1ns<\/strong> para supress\u00e3o r\u00e1pida de transientes<\/p>\n<\/li>\n<li data-start=\"1585\" data-end=\"1638\">\n<p data-start=\"1587\" data-end=\"1638\"><strong data-start=\"1587\" data-end=\"1612\">Tens\u00e3o de aperto &lt;15V<\/strong> para prote\u00e7\u00e3o dos sinais de \u00b112V<\/p>\n<\/li>\n<li data-start=\"1639\" data-end=\"1719\">\n<p data-start=\"1641\" data-end=\"1719\"><strong data-start=\"1641\" data-end=\"1680\">UL 497A, IEC 61643, ITU-T K.20\/K.21<\/strong> conformidade para aceita\u00e7\u00e3o industrial<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"1721\" data-end=\"1724\" \/>\n<h3 data-start=\"1726\" data-end=\"1767\"><strong data-start=\"1730\" data-end=\"1765\">Aplica\u00e7\u00f5es industriais nos EUA<\/strong><\/h3>\n<ol data-start=\"1768\" data-end=\"2062\">\n<li data-start=\"1768\" data-end=\"1827\">\n<p data-start=\"1771\" data-end=\"1827\"><strong data-start=\"1771\" data-end=\"1781\">Energia<\/strong> - Prote\u00e7\u00e3o da liga\u00e7\u00e3o SCADA nos parques e\u00f3licos do Texas<\/p>\n<\/li>\n<li data-start=\"1828\" data-end=\"1906\">\n<p data-start=\"1831\" data-end=\"1906\"><strong data-start=\"1831\" data-end=\"1848\">Fabrico<\/strong> - Seguran\u00e7a das comunica\u00e7\u00f5es PLC nas f\u00e1bricas de autom\u00f3veis do Midwest<\/p>\n<\/li>\n<li data-start=\"1907\" data-end=\"1987\">\n<p data-start=\"1910\" data-end=\"1987\"><strong data-start=\"1910\" data-end=\"1928\">Tr\u00e2nsito p\u00fablico<\/strong> - Sistemas de controlo dos metropolitanos nas grandes \u00e1reas metropolitanas<\/p>\n<\/li>\n<li data-start=\"1988\" data-end=\"2062\">\n<p data-start=\"1991\" data-end=\"2062\"><strong data-start=\"1991\" data-end=\"2004\">Petr\u00f3leo e g\u00e1s<\/strong> - Liga\u00e7\u00f5es de controlo de plataformas offshore no Golfo do M\u00e9xico<\/p>\n<\/li>\n<\/ol>\n<hr data-start=\"2064\" data-end=\"2067\" \/>\n<h3 data-start=\"2069\" data-end=\"2105\"><strong data-start=\"2073\" data-end=\"2103\">Diretrizes de instala\u00e7\u00e3o nos EUA<\/strong><\/h3>\n<ul data-start=\"2106\" data-end=\"2312\">\n<li data-start=\"2106\" data-end=\"2175\">\n<p data-start=\"2108\" data-end=\"2175\">Instalar protectores em <strong data-start=\"2130\" data-end=\"2143\">ambas as extremidades<\/strong> de liga\u00e7\u00f5es RS232 entre edif\u00edcios<\/p>\n<\/li>\n<li data-start=\"2176\" data-end=\"2242\">\n<p data-start=\"2178\" data-end=\"2242\">Manter a resist\u00eancia de terra <strong data-start=\"2205\" data-end=\"2216\">&lt;5 ohms<\/strong> de acordo com as recomenda\u00e7\u00f5es NEC<\/p>\n<\/li>\n<li data-start=\"2243\" data-end=\"2312\">\n<p data-start=\"2245\" data-end=\"2312\">Utilize cabos de par entran\u00e7ado blindados para uma supress\u00e3o adicional de picos de tens\u00e3o<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"2314\" data-end=\"2317\" \/>\n<h3 data-start=\"2319\" data-end=\"2339\"><strong data-start=\"2323\" data-end=\"2337\">Conclus\u00e3o<\/strong><\/h3>\n<p data-start=\"2340\" data-end=\"2488\">Para as instala\u00e7\u00f5es dos EUA, a integra\u00e7\u00e3o de um protetor contra sobretens\u00f5es RS232 \u00e9 uma forma econ\u00f3mica de eliminar os riscos de sobretens\u00f5es el\u00e9ctricas e manter o tempo de funcionamento.<\/p>\n<hr data-start=\"2490\" data-end=\"2493\" \/>\n<h2 data-start=\"2495\" data-end=\"2541\"><strong data-start=\"2498\" data-end=\"2539\">Perguntas frequentes: Protetor contra picos de tens\u00e3o RS232 nos EUA<\/strong><\/h2>\n<p data-start=\"2542\" data-end=\"2691\"><strong data-start=\"2542\" data-end=\"2549\">Q1:<\/strong> O c\u00f3digo dos EUA exige prote\u00e7\u00e3o contra sobretens\u00f5es para linhas RS232?<br data-start=\"2604\" data-end=\"2607\" \/>Embora o NEC se centre nas linhas el\u00e9ctricas, as melhores pr\u00e1ticas industriais recomendam-no vivamente.<\/p>\n<p data-start=\"2693\" data-end=\"2839\"><strong data-start=\"2693\" data-end=\"2700\">Q2:<\/strong> Este dispositivo pode proteger contra PEM de um raio pr\u00f3ximo?<br data-start=\"2759\" data-end=\"2762\" \/>Sim - quando devidamente ligado \u00e0 terra, pode suprimir eficazmente os transientes induzidos.<\/p>","protected":false},"excerpt":{"rendered":"<p>Em todos os Estados Unidos, os incidentes com sobretens\u00f5es el\u00e9ctricas continuam a ser uma das principais causas de falha do equipamento industrial. Desde parques e\u00f3licos no Texas a sistemas de sinaliza\u00e7\u00e3o de metro em Nova Iorque, as linhas de comunica\u00e7\u00e3o RS232 s\u00e3o frequentemente os pontos fracos escondidos nas redes de automa\u00e7\u00e3o. A NOAA relata que estados como a Fl\u00f3rida, Louisiana e Mississippi registam alguns dos maiores \u00edndices de rel\u00e2mpagos do mundo...<\/p>","protected":false},"author":18,"featured_media":23487,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-27892","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>RS232 surge protector | LEEYEE Electrics<\/title>\n<meta name=\"description\" content=\"Discover RS232 surge protector and further information about electrical protection. 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