{"id":14104,"date":"2023-09-18T00:07:52","date_gmt":"2023-09-18T00:07:52","guid":{"rendered":"https:\/\/www.rayzeek.com\/?p=14104"},"modified":"2023-12-26T08:44:13","modified_gmt":"2023-12-26T08:44:13","slug":"what-is-harmonic","status":"publish","type":"post","link":"https:\/\/www.rayzeek.com\/fr\/glossaire\/quest-ce-que-lharmonique","title":{"rendered":"Qu'est-ce que l'harmonique ?"},"content":{"rendered":"

Qu'est-ce que l'harmonique ?<\/h2>

Dans l'industrie de l'\u00e9clairage, le terme \"harmonique\" d\u00e9signe une composante d'un signal p\u00e9riodique d\u00e9form\u00e9 ou non sinuso\u00efdal dont la fr\u00e9quence est un multiple entier pair non nul de la fr\u00e9quence fondamentale du signal. Les harmoniques peuvent se produire dans les courants ou les tensions et sont g\u00e9n\u00e9ralement caus\u00e9es par des charges non lin\u00e9aires dans le syst\u00e8me \u00e9lectrique.<\/p>

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D\u00e9tecteurs de mouvement PIR<\/p><\/a><\/div><\/div>

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D\u00e9tecteur de mouvement pour climatiseur<\/p><\/a><\/div><\/div>

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D\u00e9tecteurs de mouvement\/d\u00e9tecteurs d'intensit\u00e9 \u00e0 basse tension \u00e0 courant continu<\/p><\/a><\/div><\/div>

Kits de d\u00e9tecteurs de mouvement sans fil<\/p><\/a><\/div><\/div><\/div><\/div>

Les harmoniques peuvent entra\u00eener divers probl\u00e8mes dans l'industrie de l'\u00e9clairage. Un probl\u00e8me courant est le scintillement des lumi\u00e8res, qui peut se produire en cas de fluctuations rapides du courant ou de la tension de charge, en particulier dans les machines. Parmi les machines susceptibles de provoquer des scintillements, on peut citer les gros moteurs au d\u00e9marrage, les machines \u00e9quip\u00e9es de cyclo-convertisseurs comme les entra\u00eenements de laminoirs et les bobineuses de mines, et les machines qui utilisent des convertisseurs de fr\u00e9quence statiques comme les moteurs \u00e0 courant alternatif et les fours \u00e9lectriques \u00e0 arc.<\/p>

Un autre probl\u00e8me caus\u00e9 par les harmoniques est la surchauffe des transformateurs et le d\u00e9clenchement des disjoncteurs. Cela se produit lorsque des charges non lin\u00e9aires tirent le courant par impulsions brusques plut\u00f4t que de mani\u00e8re sinuso\u00efdale et r\u00e9guli\u00e8re. Les courants harmoniques g\u00e9n\u00e9r\u00e9s par ces charges non lin\u00e9aires peuvent \u00eatre renvoy\u00e9s vers d'autres parties du r\u00e9seau \u00e9lectrique, ce qui entra\u00eene la surchauffe des transformateurs et le d\u00e9clenchement des disjoncteurs.<\/p>

Pour mesurer la pr\u00e9sence d'harmoniques, on utilise souvent la distorsion harmonique totale (THD). La DHT est la somme de tous les effets harmoniques et est g\u00e9n\u00e9ralement mesur\u00e9e jusqu'au 50e multiple de la fr\u00e9quence fondamentale (60 Hz aux \u00c9tats-Unis) ou \u00e0 3 kHz. Il est recommand\u00e9 que les effets harmoniques de la tension soient inf\u00e9rieurs \u00e0 8 % par rapport \u00e0 la fr\u00e9quence fondamentale, et que les valeurs sup\u00e9rieures \u00e0 8 % fassent l'objet d'un examen plus approfondi.<\/p>

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Contactez-nous pour des d\u00e9tecteurs de mouvement PIR complets, des produits d'\u00e9conomie d'\u00e9nergie activ\u00e9s par le mouvement, des interrupteurs \u00e0 d\u00e9tecteur de mouvement et des solutions commerciales d'occupation\/occupation.<\/p>

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Questions fr\u00e9quemment pos\u00e9es<\/h2>\n\n

Quelles sont les causes des harmoniques \u00e9lectriques ?<\/h3><\/div><\/div>\n\n

Les harmoniques se produisent en pr\u00e9sence de charges non lin\u00e9aires qui convertissent la tension de ligne CA en CC. Ces harmoniques p\u00e9n\u00e8trent dans le syst\u00e8me \u00e9lectrique en raison de la pr\u00e9sence de dispositifs de commutation \u00e9lectroniques non lin\u00e9aires tels que les entra\u00eenements \u00e0 fr\u00e9quence variable (VFD), les alimentations d'ordinateurs et les \u00e9clairages \u00e0 faible consommation d'\u00e9nergie.<\/p><\/div><\/div><\/div><\/div>\n\n

L'\u00e9clairage LED provoque-t-il des harmoniques ?<\/h3><\/div><\/div>\n\n

L'installation d'un \u00e9clairage LED peut entra\u00eener une distorsion harmonique provenant de la charge. Cette distorsion peut entra\u00eener des tensions sur l'\u00e9quipement et le r\u00e9seau de distribution \u00e9lectrique, ce qui se traduit par une augmentation des frais de maintenance et des temps d'arr\u00eat. Il est important de noter que les effets du stress harmonique peuvent parfois ne pas \u00eatre apparents jusqu'\u00e0 ce qu'il y ait une d\u00e9faillance compl\u00e8te de l'\u00e9quipement.<\/p><\/div><\/div><\/div><\/div>\n\n

Comment les harmoniques affectent-elles la qualit\u00e9 de l'\u00e9lectricit\u00e9 ?<\/h3><\/div><\/div>\n\n

Les courants harmoniques ont un impact n\u00e9gatif sur la qualit\u00e9 de l'\u00e9nergie en provoquant une augmentation du courant efficace dans les syst\u00e8mes \u00e9lectriques. Cela entra\u00eene une d\u00e9t\u00e9rioration de la qualit\u00e9 de la tension d'alimentation. En outre, les harmoniques exercent une pression sur le r\u00e9seau \u00e9lectrique et peuvent endommager les \u00e9quipements. Elles peuvent \u00e9galement perturber le fonctionnement normal des appareils et entra\u00eener des co\u00fbts d'exploitation plus \u00e9lev\u00e9s.<\/p><\/div><\/div><\/div><\/div>\n\n

Comment v\u00e9rifier les harmoniques dans un r\u00e9seau \u00e9lectrique ?<\/h3><\/div><\/div>\n\n

Mesurez la distorsion harmonique totale (THD) \u00e0 l'aide d'une pince de mesure capable d'indiquer les harmoniques. Veillez \u00e0 ce que la DHT pour la tension ne d\u00e9passe pas 5%, alors que la DHT pour le courant peut \u00eatre consid\u00e9rablement plus \u00e9lev\u00e9e. Pour mieux comprendre l'ampleur et l'impact de chaque harmonique, utilisez un analyseur de la qualit\u00e9 de l'\u00e9nergie.<\/p><\/div><\/div><\/div><\/div>\n\n

Les harmoniques affectent-elles la tension ?<\/h3><\/div><\/div>\n\n

Les tensions harmoniques, qui sont produites lorsque des courants harmoniques circulent contre l'imp\u00e9dance de l'harmonique, peuvent entra\u00eener des surtensions notables. On a observ\u00e9 que ces surtensions provoquaient des dysfonctionnements de l'\u00e9quipement, les condensateurs \u00e9tant particuli\u00e8rement vuln\u00e9rables \u00e0 ces effets.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Dans l'industrie de l'\u00e9clairage, le terme \"harmonique\" d\u00e9signe une composante d'un signal p\u00e9riodique d\u00e9form\u00e9 ou non sinuso\u00efdal dont la fr\u00e9quence est un multiple entier pair non nul de la fr\u00e9quence fondamentale du signal.<\/p>","protected":false},"author":4,"featured_media":12868,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"article_term":"","article_term_alternate":"","article_term_def":"","article_hook":"","auto_links":"[{\"keyword\": \"lighting industry\", \"idxall\": 1, \"keywordtitlesimi\": 0.7885549306869507, \"keywordslugsimi\": 0.7885549306869507, \"paratitlesimi\": 0.6529279321432114, \"paraslugsimi\": 0.6529279321432114, \"slug\": \"tips-for-increasing-the-efficiency-of-commercial-lighting\", \"title\": \"Tips for Increasing the Efficiency of Commercial Lighting\", \"id\": 10327}, {\"keyword\": \"60 Hz\", \"idxall\": 0, \"keywordtitlesimi\": 0.7806369662284851, \"keywordslugsimi\": 0.7707458734512329, \"paratitlesimi\": 0.6719734072685242, \"paraslugsimi\": 0.6530662775039673, \"slug\": \"what-is-hertz-hz\", \"title\": \"What is Hertz (Hz)\", \"id\": 14300}]","article_topic":"","article_fact_check":"","mt_social_share":"","mt_content_meta":"","mt_glossary_display":"","glossary_heading":"","glossary":"harmonic","glossary_alter":"","glossary_def":"","article_task":"","footnotes":""},"categories":[102],"tags":[99],"class_list":["post-14104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-glossary"],"yoast_head":"\nWhat is Harmonic - 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