{"id":868,"date":"2023-12-12T15:39:17","date_gmt":"2023-12-12T07:39:17","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&p=868"},"modified":"2024-09-05T16:41:11","modified_gmt":"2024-09-05T08:41:11","slug":"how-to-choose-an-spd","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/fi\/blog\/how-to-choose-an-spd\/","title":{"rendered":"Kuinka valita SPD"},"content":{"rendered":"Miksi ostaa ylij\u00e4nnitesuojalaite (SPD)?<\/strong>\r\n\r\nYlij\u00e4nnitesuojalaite (SPD) on suunniteltu v\u00e4hent\u00e4m\u00e4\u00e4n ylij\u00e4nnitej\u00e4nnitett\u00e4, mik\u00e4 suojaa laitteita ja v\u00e4hent\u00e4\u00e4 korjaus- ja vaihtokustannuksia. Jokainen SPD alentaa laitteiden ylij\u00e4nnitteen ylij\u00e4nnitteen aikana testattuun j\u00e4nnitetasoon, joka tunnetaan nimell\u00e4 Let-Through-Voltage.\r\n\r\nSuojaustyypit<\/strong>\r\n\r\nKun keskustellaan erilaisista ylij\u00e4nnitesuojatyypeist\u00e4, on kolme p\u00e4\u00e4tyyppi\u00e4:\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Tyyppi<\/td>\r\nMit\u00e4 se tekee<\/td>\r\nMiss\u00e4 sit\u00e4 k\u00e4ytet\u00e4\u00e4n<\/td>\r\n<\/tr>\r\n
Tyyppi 1<\/td>\r\nSuojaus suorilta salamaniskuilta<\/td>\r\nKaikkien s\u00e4hk\u00f6asennusten verkkoliit\u00e4nt\u00e4\u00e4n, johon on asennettu ulkoinen ukkossuojaus tai johon sy\u00f6tet\u00e4\u00e4n ilmajohtoja.<\/td>\r\n<\/tr>\r\n
Tyyppi 2<\/td>\r\nYlij\u00e4nnitesuoja<\/td>\r\nMink\u00e4 tahansa rakennuksen verkkoliit\u00e4nn\u00e4ss\u00e4, joka ei tarvitse salamansuojaa, ja k\u00e4ytett\u00e4v\u00e4ksi miss\u00e4 tahansa alalevyss\u00e4 yli 10-15 metrin p\u00e4\u00e4ss\u00e4 p\u00e4\u00e4paneelista.<\/td>\r\n<\/tr>\r\n
Tyyppi 3<\/td>\r\nLoppulaitteiden suojaus<\/td>\r\nKaikille laitteille, joissa tarvitaan alhainen l\u00e4pimenoj\u00e4nnite.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nMik\u00e4 on oikea tapa m\u00e4\u00e4ritt\u00e4\u00e4, mink\u00e4 kokoista SPD:t\u00e4 j\u00e4rjestelm\u00e4ss\u00e4 k\u00e4ytet\u00e4\u00e4n?<\/strong>\r\n\r\nSPDs are not one-size-fits-all devices, nor do the sizes of their kA rating (the surge rating) go hand-in-hand with the size of the panel. In other words, do not select an SPD with a maximum kA rating just because the panel is large.\r\n\r\nTo determine which SPD should be used for the system, you must know the reference to the ground as well as the type of voltage that is present. Therefore, a panel designer should first determine the type of electrical system in use, and then calculate the voltage reference to ground. The formula to determine this will depend on the type of system.\r\n\r\nFor example, for a single-phase system (also called a split-phase system), the line-to-line voltage is divided by two. The result is the optimal amount of volts that the SPD should have for that system.\r\n\r\nKuinka valita laite<\/strong>\r\n
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  • Sopiiko laite maadoitusj\u00e4rjestely\u00f6si?<\/li>\r\n<\/ul>\r\nT\u00e4m\u00e4 on yksi yleisimmist\u00e4 SPD-asennuksen ongelmista. T\u00e4rkein huomio on TT-j\u00e4rjestelmiss\u00e4, joissa laitteen tulee olla sopiva.\r\n
      \r\n \t
    • Suojaako laite sek\u00e4 j\u00e4nnitteen ett\u00e4 neutraalin napoja?<\/li>\r\n<\/ul>\r\nMarkkinoilla on muutamia laitteita, jotka saattavat vaikuttaa edullisilta muihin laitteisiin verrattuna, mutta jos laite ei suojaa sek\u00e4 j\u00e4nnitteell\u00e4 ett\u00e4 neutraalilla, ylij\u00e4nnite voi tulla kiinteist\u00f6si ja ohittaa SPD:n.\r\n
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      • Mink\u00e4 takuun valmistaja antaa?<\/li>\r\n<\/ul>\r\nT\u00e4m\u00e4 on yleens\u00e4 SPD:ss\u00e4 k\u00e4ytettyjen komponenttien laadun avainindikaattori.\r\n\r\nOikean ylij\u00e4nnitesuojalaitteen (SPD) ostaminen.<\/strong>\r\n\r\nVaikka mik\u00e4 tahansa SPD v\u00e4hent\u00e4\u00e4 ylij\u00e4nnitetasoa, joka siirtyy s\u00e4hk\u00f6laitteisiin ylij\u00e4nnitetapahtuman aikana, joidenkin l\u00e4pimenoj\u00e4nnite on liian korkea vaurioiden est\u00e4miseksi, mik\u00e4 on melkein sama kuin ilman suojausta. BRITEC tarjoaa t\u00e4ydellisen valikoiman ylij\u00e4nnitesuojalaitteita s\u00e4hk\u00f6laitteiden suojaamiseen. BRITEC Surge Protective Devices on oikea valinta kaikkiin yrityksiin ja koteihin.","protected":false},"featured_media":870,"parent":0,"menu_order":143,"template":"","meta":{"_acf_changed":false},"blog_category":[8],"class_list":["post-868","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-company-news"],"acf":{"des":"A Surge Protective Device (SPD) is designed to reduce surge voltage, which protects equipment and reduces repair and replacement costs. Every SPD reduces the surge voltage to equipment during a surge to a voltage tested level known as Let-Through-Voltage.","txt":"Why Purchase a Surge Protective Device (SPD)?<\/strong>\r\n\r\nA Surge Protective Device (SPD) is designed to reduce surge voltage, which protects equipment and reduces repair and replacement costs. Every SPD reduces the surge voltage to equipment during a surge to a voltage tested level known as Let-Through-Voltage.\r\n\r\nTypes of Protection<\/strong>\r\n\r\nWhen discussing di\ufb00erent types of surge protection, there are three main types:\r\n\r\n\r\n\r\n\r\n\r\n\r\n
        Type<\/td>\r\nWhat it does<\/td>\r\nWhere to use it<\/td>\r\n<\/tr>\r\n
        Type 1<\/td>\r\nProtection against direct Lightning strikes<\/td>\r\nAt the mains incomer of any electrical installation where external Lightning Protection is installed, or is fed by overhead lines.<\/td>\r\n<\/tr>\r\n
        Type 2<\/td>\r\nSurge Protection<\/td>\r\nAt the mains incomer of any building that doesn\u2019t need any lightning protection, and for use on any sub boards more than 10-15 meters from the main panel.<\/td>\r\n<\/tr>\r\n
        Type 3<\/td>\r\nEnd equipment protection<\/td>\r\nOn any piece of equipment where a low let through voltage is needed.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nWhat is the correct way to determine which size of SPD to use in a system?<\/strong>\r\n\r\nSPDs are not one-size-fits-all devices, nor do the sizes of their kA rating (the surge rating) go hand-in-hand with the size of the panel. In other words, do not select an SPD with a maximum kA rating just because the panel is large.\r\n\r\nTo determine which SPD should be used for the system, you must know the reference to the ground as well as the type of voltage that is present. Therefore, a panel designer should first determine the type of electrical system in use, and then calculate the voltage reference to ground. The formula to determine this will depend on the type of system.\r\n\r\nFor example, for a single-phase system (also called a split-phase system), the line-to-line voltage is divided by two. The result is the optimal amount of volts that the SPD should have for that system.\r\n\r\nHow to choose a device<\/strong>\r\n
          \r\n \t
        • Is the device suitable for your earthing arrangement?<\/li>\r\n<\/ul>\r\nThis is one of the most common issues with SPD installation. The most important consideration is for TT systems, where the device needs to be suitable.\r\n
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          • Is the device protecting both the live & neutral poles?<\/li>\r\n<\/ul>\r\nThere are a few devices on the market with may seem inexpensive compared to other devices, but if the device is not protecting both live & neutral, surges may enter your property and bypass the SPD.\r\n
              \r\n \t
            • What warranty does the manufacturer provide?<\/li>\r\n<\/ul>\r\nThis is generally a key indicator of the quality of the components used in the SPD.\r\n\r\nPurchasing the Right Surge Protective Device (SPD).<\/strong>\r\n\r\nWhile any SPD will reduce the surge voltage level passing to electrical equipment during a surge event, some have a Let-Through-Voltage that is too high to prevent damage, which is almost the same as having no protection at all. BRITEC offers a complete range of surge protective devices to protect electrical equipment. BRITEC Surge Protective Devices are the right choice for all businesses and homes."},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/blog\/868","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/media\/870"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/media?parent=868"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/blog_category?post=868"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}