{"id":4266,"date":"2024-02-27T14:10:18","date_gmt":"2024-02-27T20:10:18","guid":{"rendered":"https:\/\/www.dreiym.com\/?p=4266"},"modified":"2025-01-17T18:02:42","modified_gmt":"2025-01-18T00:02:42","slug":"nec-2023-240-87-valokaarienergian-vahentaminen","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2024\/02\/27\/nec-2023-240-87-valokaarienergian-vahentaminen\/","title":{"rendered":"NEC 240.87: Arc Energy Reduction"},"content":{"rendered":"<p>Opas s\u00e4hk\u00f6alan ammattilaisille vuoden 2023 NEC-painosta varten.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mik\u00e4 on NEC 240.87?<\/h2>\n\n\n\n<p>NEC 240.87 on s\u00e4\u00e4nn\u00f6st\u00f6n osa. <a href=\"https:\/\/en.wikipedia.org\/wiki\/National_Electrical_Code\" title=\"\">Kansallinen s\u00e4hk\u00f6lains\u00e4\u00e4d\u00e4nt\u00f6 (NEC)<\/a>), jossa edellytet\u00e4\u00e4n valokaarienergian v\u00e4hent\u00e4mismenetelmi\u00e4 v\u00e4hint\u00e4\u00e4n 1200 ampeerin katkaisijoille. Valokaarienergia on l\u00e4mm\u00f6n ja valon m\u00e4\u00e4r\u00e4, jonka tuottaa valokaari. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2024\/06\/11\/miten-valokaaren-valahdykset-liittyvat-syvalliseen-sahkovika-analyysiin-ja-tarkastuksiin\/'>valokaari<\/a> vika, joka voi aiheuttaa vakavia vahinkoja laitteille ja henkil\u00f6st\u00f6lle. Valokaarienergian v\u00e4hent\u00e4mismenetelm\u00e4t on suunniteltu v\u00e4hent\u00e4m\u00e4\u00e4n valokaarivian kestoa ja voimakkuutta ja siten minimoimaan mahdolliset vaarat.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Miksi NEC 240.87 on t\u00e4rke\u00e4?<\/h2>\n\n\n\n<p>NEC 240.87 on t\u00e4rke\u00e4, koska siin\u00e4 k\u00e4sitell\u00e4\u00e4n vakavaa turvallisuuskysymyst\u00e4, joka liittyy <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2022\/07\/29\/3-yleista-syyta-miksi-sahkojarjestelmat-eivat-toimi\/'>s\u00e4hk\u00f6j\u00e4rjestelm\u00e4t<\/a>. Valokaarivikoja voi esiinty\u00e4 eri syist\u00e4, kuten eristysvioista, <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2024\/02\/28\/miten-valtetaan-loysat-sahkoliitannat-ja-ehkaistaan-tulipalovaara\/'>l\u00f6ys\u00e4t liit\u00e4nn\u00e4t,<\/a> vieraat esineet tai inhimillinen erehdys. Valokaarivian sattuessa voi synty\u00e4 jopa 35 000 celsiusasteen l\u00e4mp\u00f6tiloja, jotka voivat sulattaa metallia, sytytt\u00e4\u00e4 palavia materiaaleja ja aiheuttaa vakavia palovammoja ja vammoja. Valokaariviat voivat my\u00f6s luoda paineaaltoja, jotka voivat puhkaista t\u00e4rykalvot, vahingoittaa keuhkoja ja rikkoa ikkunoita. National Fire Protection Associationin (NFPA) mukaan valokaariviat aiheuttavat Yhdysvalloissa vuosittain yli 2 000 loukkaantumista ja 400 kuolemantapausta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mitk\u00e4 ovat NEC 240.87:ss\u00e4 vaaditut valokaarienergian v\u00e4hent\u00e4mismenetelm\u00e4t?<\/h2>\n\n\n\n<p>NEC 240.87 edellytt\u00e4\u00e4 yht\u00e4 seuraavista valokaarienergian v\u00e4hent\u00e4mismenetelmist\u00e4 v\u00e4hint\u00e4\u00e4n 1200 ampeerin katkaisijoille:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vy\u00f6hykeselektiivinen lukitus (ZSI): T\u00e4m\u00e4 menetelm\u00e4 k\u00e4ytt\u00e4\u00e4 katkaisijoiden v\u00e4lisi\u00e4 viestint\u00e4signaaleja niiden laukaisuaikojen koordinoimiseksi ja vikaantuneen vy\u00f6hykkeen erist\u00e4miseksi mahdollisimman nopeasti. ZSI voi v\u00e4hent\u00e4\u00e4 valokaarienergiaa jopa 50% verrattuna perinteiseen koordinointiin. ZSI edellytt\u00e4\u00e4 yhteensopivia katkaisijoita ja niiden v\u00e4list\u00e4 johdotusta.<\/li>\n\n\n\n<li>Differentiaalinen v\u00e4litys: T\u00e4ss\u00e4 menetelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n virtamuuntajia mittaamaan katkaisijan tulevan ja l\u00e4htev\u00e4n virran eroa ja laukaisemaan katkaisijan, jos ero ylitt\u00e4\u00e4 asetetun arvon. Differentiaalireleiden avulla voidaan v\u00e4hent\u00e4\u00e4 valokaarienergiaa jopa 80%:ll\u00e4 verrattuna perinteiseen koordinointiin. Differentiaalireleiden kytkent\u00e4 edellytt\u00e4\u00e4 ylim\u00e4\u00e4r\u00e4isi\u00e4 virtamuuntajia ja releit\u00e4.<\/li>\n\n\n\n<li>Energiaa v\u00e4hent\u00e4v\u00e4 huoltokytkent\u00e4, jossa on paikallinen tilanilmaisin: T\u00e4ss\u00e4 menetelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n kytkint\u00e4, jota voidaan k\u00e4ytt\u00e4\u00e4 manuaalisesti katkaisijan laukaisukynnyksen alentamiseksi, ja valoa, joka ilmaisee kytkimen tilan. Energiaa v\u00e4hent\u00e4v\u00e4ll\u00e4 huoltokytkenn\u00e4ll\u00e4 voidaan v\u00e4hent\u00e4\u00e4 valokaarienergiaa jopa 70% tavanomaiseen koordinointiin verrattuna. Energiaa v\u00e4hent\u00e4v\u00e4 huoltokytkent\u00e4 edellytt\u00e4\u00e4 kytkint\u00e4 ja valoa katkaisijassa tai sen l\u00e4hell\u00e4.<\/li>\n\n\n\n<li>Energiaa v\u00e4hent\u00e4v\u00e4 aktiivinen valokaaren v\u00e4l\u00e4hdyksenvaimennusj\u00e4rjestelm\u00e4: T\u00e4ss\u00e4 menetelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n laitetta, joka pystyy havaitsemaan ja sammuttamaan valokaarivian luomalla vikavirralle matalaimpedanssisen reitin ja sy\u00f6tt\u00e4m\u00e4ll\u00e4 valokaarelle vastaj\u00e4nnitett\u00e4. Energiaa v\u00e4hent\u00e4v\u00e4 aktiivinen <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2020\/09\/08\/tapoja-vahentaa-valokaari-iskutapahtumia\/'>valokaaren v\u00e4l\u00e4hdyksen lievent\u00e4misj\u00e4rjestelm\u00e4 voi v\u00e4hent\u00e4\u00e4<\/a> valokaarienergiaa jopa 90% verrattuna perinteiseen koordinointiin. Energiaa v\u00e4hent\u00e4v\u00e4 aktiivinen valokaaren v\u00e4l\u00e4hdyksenvaimennusj\u00e4rjestelm\u00e4 vaatii laitteen ja virtal\u00e4hteen.<\/li>\n\n\n\n<li>Hetkellinen laukaisuasetus: T\u00e4ss\u00e4 menetelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n katkaisijaa, joka voi laukaista yhden jakson tai v\u00e4hemm\u00e4n vikavirran saavuttaessa esiasetetun arvon. Hetkellinen laukaisuasetus voi v\u00e4hent\u00e4\u00e4 valokaarienergiaa jopa 40% verrattuna perinteiseen koordinointiin. Hetkellinen laukaisu edellytt\u00e4\u00e4 katkaisijaa, jossa on s\u00e4\u00e4dett\u00e4v\u00e4 hetkellinen laukaisutoiminto.<\/li>\n\n\n\n<li>Hetkellinen ohitus: T\u00e4ss\u00e4 menetelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n katkaisijaa, joka voi ohittaa normaalin viiveen ja laukaista v\u00e4litt\u00f6m\u00e4sti, kun vikavirta ylitt\u00e4\u00e4 tietyn tason. Hetkellinen ohitus voi v\u00e4hent\u00e4\u00e4 valokaarienergiaa jopa 60% verrattuna perinteiseen koordinointiin. Hetkellinen ohitus edellytt\u00e4\u00e4 katkaisijaa, jossa on hetkellinen ohitusominaisuus.<\/li>\n\n\n\n<li>Hyv\u00e4ksytty vastaava keino: T\u00e4ss\u00e4 menetelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n mit\u00e4 tahansa muuta tekniikkaa, jolla valokaaren energia voidaan v\u00e4hent\u00e4\u00e4 alle ty\u00f6et\u00e4isyydell\u00e4 esiintyv\u00e4n energian tason. Hyv\u00e4ksytyt vastaavat keinot voivat vaihdella suorituskyvylt\u00e4\u00e4n ja asennusvaatimuksiltaan. Hyv\u00e4ksyttyjen vastaavien keinojen on oltava toimivaltaisen viranomaisen hyv\u00e4ksymi\u00e4. Joskus tarvitaan luovuutta, ja k\u00e4ytt\u00e4m\u00e4ll\u00e4 erityisi\u00e4 reletoimintoja tai muita teknisi\u00e4 ratkaisuja voidaan saavuttaa samat tai paremmat tulokset valokaarivian v\u00e4hent\u00e4misess\u00e4. T\u00e4m\u00e4 edellytt\u00e4\u00e4 teknisi\u00e4 laskelmia. Konsultoi <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/services\/sahkoteho\/valokaari-iskututkimukset\/\" title=\"\">s\u00e4hk\u00f6insin\u00f6\u00f6ri<\/a> auttaa sinua muiden ratkaisujen kanssa.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Miten noudatetaan NEC 240.87:\u00e4\u00e4?<\/h2>\n\n\n\n<p>Noudattaakseen NEC 240.87:\u00e4\u00e4 s\u00e4hk\u00f6alan ammattilaisten on noudatettava seuraavia ohjeita:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tunnista s\u00e4hk\u00f6j\u00e4rjestelm\u00e4n katkaisijat, jotka on mitoitettu v\u00e4hint\u00e4\u00e4n 1200 ampeerin teholle.<\/li>\n\n\n\n<li>Valitse ja asenna yksi valokaarienergian v\u00e4hent\u00e4mismenetelmist\u00e4 kuhunkin katkaisijaan.<\/li>\n\n\n\n<li>Merkitse katkaisijaan valokaarienergian v\u00e4hennysmenetelm\u00e4 ja asiakirjojen sijainti.<\/li>\n\n\n\n<li>Dokumentoi valokaarienergian v\u00e4hent\u00e4mismenetelm\u00e4 ja katkaisijan asetukset.<\/li>\n\n\n\n<li>Testaa ja todentaa kaarienergian v\u00e4hent\u00e4mismenetelm\u00e4n toimivuus.<\/li>\n\n\n\n<li>P\u00e4ivitet\u00e4\u00e4n s\u00e4hk\u00f6j\u00e4rjestelm\u00e4n valokaari-vaara-analyysi ja valokaari-vaaramerkinn\u00e4t.<\/li>\n<\/ul>\n\n\n\n<p>NEC 240.87 on s\u00e4\u00e4nn\u00f6st\u00f6n kohta, jossa vaaditaan valokaarienergian v\u00e4hent\u00e4mismenetelmi\u00e4 v\u00e4hint\u00e4\u00e4n 1200 ampeerin katkaisijoille. Sen tarkoituksena on parantaa turvallisuutta <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2024\/06\/11\/miten-valokaaren-valahdykset-liittyvat-syvalliseen-sahkovika-analyysiin-ja-tarkastuksiin\/'>s\u00e4hk\u00f6j\u00e4rjestelmi\u00e4 ja v\u00e4hent\u00e4\u00e4 valokaaren<\/a> vikoja. S\u00e4hk\u00f6alan ammattilaisten tulisi tuntea valokaarienergian v\u00e4hent\u00e4mismenetelm\u00e4t ja toimenpiteet NEC 240.87 -standardin noudattamiseksi.<\/p>","protected":false},"excerpt":{"rendered":"<p>A Guide for Electrical Professionals for the 2023 NEC edition. What is NEC 240.87? NEC 240.87 is a code section in the National Electrical Code (NEC) that requires arc energy reduction methods for circuit breakers rated at 1200 amps or higher. Arc energy is the amount of heat and light produced by an electrical arc [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":4267,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":true,"_pgmb_ap_template_id":0,"iawp_total_views":218,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-4266","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"A Guide for Electrical Professionals for the 2023 NEC edition. What is NEC 240.87? 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