{"id":16753,"date":"2024-11-28T14:00:00","date_gmt":"2024-11-28T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=16753"},"modified":"2024-12-11T12:14:53","modified_gmt":"2024-12-11T11:14:53","slug":"152-il-declassamento-nel-dettaglio","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2024\/11\/28\/152-il-declassamento-nel-dettaglio\/","title":{"rendered":"#152 Il declassamento nel dettaglio"},"content":{"rendered":"\n
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Non \u00e8 bello proporre a un cliente un protettore termico e dopo aver trovato l\u2019accordo sul prezzo sentirsi dire che non ha superato le prove tecniche perch\u00e9 interveniva troppo presto, a temperature pi\u00f9 basse di quella per cui era costruito.\u00a0\u00c8\u00a0disorientante e brutto. Qualche volta mi \u00e8 capitato, ma andando ovviamente ad approfondire emergevano particolari tecnici non considerati in precedenza. Certo \u00e8 una brutta sorpresa. Sia per chi propone un protettore convinto di aver risolto il problema, sia per chi testa il prodotto, convinto di aver trovato una soluzione alle sue ricerche e vede fallire, a volte malamente, i suoi test. Ma spesso esiste una ragione tecnica che deve essere considerata in anticipo, fin dalla progettazione teorica dell\u2019apparecchiatura.<\/p>\n\n\n\n

Sappiamo bene che la corrente aumentando pu\u00f2 trasformarsi in calore. \u00c8 il cosiddetto effetto Joule<\/strong><\/a>\u00a0che, ad esempio, \u00e8 alla base del funzionamento delle resistenze elettriche, tanto per citare una delle applicazioni pi\u00f9 comuni. Abbiamo visto che influenza anche un\u2019infinit\u00e0 di macchine, come le coperte elettriche<\/a><\/strong>, gli elettrodomestici professionali della ristorazione<\/strong><\/a> come le macchine per caff\u00e8 o pi\u00f9 in generale i forni<\/strong><\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Torniamo al nostro esempio iniziale. Un aumento della corrente pu\u00f2 trasformarsi in un\u00a0aumento della temperatura<\/strong>. Soprattutto nel caso in cui il circuito venga alimentato da un carico (\u00e8 l\u2019energia che attraversa il circuito) induttivo, che sviluppa i campi elettromagnetici che consentono l\u2019avviamento di un\u00a0motore elettrico<\/strong>. Questa \u00e8 poi una delle principali applicazioni dei protettori termici. In questo particolare caso possiamo avere in fase di avviamento un picco di corrente. Questo deve essere considerato per non avere le spiacevoli sorprese a cui si faceva cenno prima.<\/p>\n\n\n\n

Un passaggio di corrente al di sopra della portata pu\u00f2 causare il fenomeno del\u00a0declassamento in un protettore termico<\/strong>. Questo va cos\u00ec a rilevare una temperatura pi\u00f9 alta di quella dell\u2019ambiente in cui si trova ad operare (ad esempio all\u2019interno di un avvolgimento elettrico). Di conseguenza ad intervenire prima di quanto ci si aspetti. In pratica, se ho un protettore termo amperometrico (sensibile alla corrente<\/em>) che deve intervenire a\u00a0120\u00b0C<\/strong>\u00a0all\u2019interno di un avvolgimento, l\u2019aumento della corrente che attraversa i contatti si andr\u00e0 a trasformare in calore e il protettore andr\u00e0 a percepire una temperatura pi\u00f9 bassa di quella effettiva dell\u2019avvolgimento, con i risultati che conosciamo.<\/p>\n\n\n\n

Ma \u00e8 possibile far fronte a queste esigenze. Oltre ai protettori termici sensibili alla corrente, o termo amperometrici, come il\u00a0C1<\/a><\/strong>,\u00a0BW-B2D<\/a><\/strong>,\u00a0BW-A1D<\/a><\/strong>,\u00a0KW-1T<\/a><\/strong>,\u00a0KW-3B<\/a><\/strong>,\u00a07AMI<\/a><\/strong>\u00a0e il\u00a0CS2<\/a><\/strong> esistono anche i protettori esclusivamente termici, poco o per nulla influenzati dal passaggio di corrente, come i modelli\u00a0C4<\/a><\/strong>,\u00a0C8<\/strong><\/a>,\u00a0H20<\/a><\/strong>,\u00a0H21<\/a><\/strong>,\u00a0KSD9700<\/a><\/strong>.\u00a0<\/p>\n\n\n\n

La cosa pi\u00f9 importante \u00e8 avere chiare le prestazioni che un prodotto dovr\u00e0 essere in grado di garantire, e su quella base effettuare la scelta.<\/p>\n\n\n\n

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Non \u00e8 bello proporre a un cliente un protettore termico e dopo aver trovato l\u2019accordo sul prezzo sentirsi dire che non ha superato le prove tecniche perch\u00e9 interveniva troppo presto, a temperature pi\u00f9 basse di quella per cui era costruito.\u00a0\u00c8\u00a0disorientante e brutto. Qualche volta mi…<\/p>\n","protected":false},"author":2,"featured_media":16769,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[1221,222,1223],"class_list":["post-16753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-electronica","tag-fiere","tag-monaco"],"yoast_head":"\n#152 Il declassamento nel dettaglio -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rdcomponents.com\/site\/2024\/11\/28\/152-il-declassamento-nel-dettaglio\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#152 Il declassamento nel dettaglio -\" \/>\n<meta property=\"og:description\" content=\"Non \u00e8 bello proporre a un cliente un protettore termico e dopo aver trovato l\u2019accordo sul prezzo sentirsi dire che non ha superato le prove tecniche perch\u00e9 interveniva troppo presto, a temperature pi\u00f9 basse di quella per cui era costruito.\u00a0\u00c8\u00a0disorientante e brutto. 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Ferranti","author_link":"https:\/\/rdcomponents.com\/site\/author\/roberto\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/rdcomponents.com\/site\/category\/funzionamento-tecnico\/\" rel=\"category tag\">Funzionamento tecnico<\/a> <a href=\"https:\/\/rdcomponents.com\/site\/category\/prodotti\/\" rel=\"category tag\">Prodotti<\/a>","rttpg_excerpt":"Non \u00e8 bello proporre a un cliente un protettore termico e dopo aver trovato l\u2019accordo sul prezzo sentirsi dire che non ha superato le prove tecniche perch\u00e9 interveniva troppo presto, a temperature pi\u00f9 basse di quella per cui era costruito.\u00a0\u00c8\u00a0disorientante e brutto. Qualche volta mi...","_links":{"self":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/16753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/comments?post=16753"}],"version-history":[{"count":0,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/16753\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media\/16769"}],"wp:attachment":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media?parent=16753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/categories?post=16753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/tags?post=16753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}