{"id":860,"date":"2023-12-16T15:27:37","date_gmt":"2023-12-16T07:27:37","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&#038;p=860"},"modified":"2024-09-05T16:40:40","modified_gmt":"2024-09-05T08:40:40","slug":"surge-protector-application","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/it\/blog\/surge-protector-application\/","title":{"rendered":"Applicazione di protezione dalle sovratensioni"},"content":{"rendered":"Con il rapido sviluppo della tecnologia elettronica, \u00e8 stata prestata maggiore attenzione ai fulmini nelle costruzioni. Pertanto, con l'introduzione sul mercato di sempre pi\u00f9 prodotti di protezione da sovratensione, anche il dispositivo di protezione contro le sovratensioni (SPD) sta diventando familiare alle persone.\r\n\r\n<strong>1 Prerequisiti per l'installazione del dispositivo di protezione da sovratensione<\/strong>\r\n\r\nRagionevole divisione dell'area di protezione, in base alla possibilit\u00e0 che oggetti vengano colpiti da fulmini e al grado di attenuazione dell'intensit\u00e0 del campo elettromagnetico, l'edificio \u00e8 suddiviso in zona LPZ0A, zona LPZ0B, zona LPZ1\u2026zona LPZn+1.\r\n\r\n<strong>2 Caratteristiche del limitatore di sovratensione<\/strong>\r\n\r\nWhen SPD is selected in a 220\/380V three-phase system, its maximum continuous operating voltage Uc should be selected according to the different grounding system forms.\r\n\r\nThe In of Class I classification test should not be less than 15kA, and the In of Class II classification test should not be less than 5kA.\r\n\r\nTo protect the protected device from overvoltage, the voltage protection level Up of SPD should always be less than the impulse withstand voltage Uchoc of the protected device, and greater than the maximum power grid operating voltage Usmax (Usmax &lt; Up &lt; Uchoc).\r\n\r\n<strong>3 Classificazione dei limitatori di sovratensione<\/strong>\r\n\r\nVoltage switching SPD: High impedance when there is no surge, sudden change to low impedance under surge transient overvoltage, such as discharge gap, gas discharge tube, etc., generally used in LPZ0, LPZ1 zone.\r\n\r\nVoltage limiting SPD: High impedance when there is no surge, and as the surge increases, the impedance continues to become smaller, such as varistor, suppression diode, etc., generally used in LPZ1, LPZ2 zone, etc.\r\n\r\nCombined SPD: It is composed of voltage switching type and voltage limiting type.\r\n\r\n<strong>4 Selezione del limitatore di sovratensione<\/strong>\r\n\r\nThe cable of the SPD and the protected device should be as short as possible, within 0.5 m.\r\n\r\nWhen multiple SPDS are installed on the lines, the length of the cable between the voltage switching SPD and the voltage limiting SPD should not be less than 10m, and the length of the cable between the voltage limiting SPD should not be less than 5m.\r\n\r\nWhen the distance between the SPD and the protected device is greater than 30m, install another SPD as close as possible to the protected device.\r\n\r\nWhen choosing SPD, attention should be paid to ensure that the SPD will not burn due to power frequency overvoltage, because SPD is anti-transient overvoltage (\u03bcs level), power frequency overvoltage is ms level, the energy of power frequency overvoltage is hundreds of times transient overvoltage, therefore, attention should be paid to the selection of SPD with higher power frequency operating voltage.\r\n\r\nSPD protection: Each level of SPD should be protected, and can be protected by circuit breakers or fuses, and the breaking capacity of the protector is greater than the maximum short-circuit current.\r\n\r\nIn the anti-lightning, the shielding, grounding and equipotential measures of the building should be done first, and a reasonable evaluation of the project should be made to determine the expected maximum surge current that the system should withstand, and then the SPD is installed in common mode, differential mode or full-mode wiring according to different grounding forms, and the parameters of SPD are fully considered to match the protected equipment. At the same time, the rationality of its cost performance is investigated to achieve safety, applicability and economy.","protected":false},"featured_media":861,"parent":0,"menu_order":147,"template":"","meta":{"_acf_changed":false},"blog_category":[8],"class_list":["post-860","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-company-news"],"acf":{"des":"With the rapid development of electronic technology, more attention has been paid to lightning strikes in construction. Thus, more overvoltage protection products into the market, the Surge Protective Device (SPD) is also becoming familiar to people.","txt":"With the rapid development of electronic technology, more attention has been paid to lightning strikes in construction. Thus, more overvoltage protection products into the market, the Surge Protective Device (SPD) is also becoming familiar to people.\r\n\r\n<strong>1 Prerequisites for installing the surge protector<\/strong>\r\n\r\nReasonable division of the protection area, according to the possibility of objects hit by lightning and the degree of attenuation of electromagnetic field intensity, the building is divided into LPZ0A zone, LPZ0B zone, LPZ1 zone\u2026LPZn+1 zone.\r\n\r\n<strong>2 Characteristics of the surge protector<\/strong>\r\n\r\nWhen SPD is selected in a 220\/380V three-phase system, its maximum continuous operating voltage Uc should be selected according to the different grounding system forms.\r\n\r\nThe In of Class I classification test should not be less than 15kA, and the In of Class II classification test should not be less than 5kA.\r\n\r\nTo protect the protected device from overvoltage, the voltage protection level Up of SPD should always be less than the impulse withstand voltage Uchoc of the protected device, and greater than the maximum power grid operating voltage Usmax (Usmax &lt; Up &lt; Uchoc).\r\n\r\n<strong>3 Classification of surge protectors<\/strong>\r\n\r\nVoltage switching SPD: High impedance when there is no surge, sudden change to low impedance under surge transient overvoltage, such as discharge gap, gas discharge tube, etc., generally used in LPZ0, LPZ1 zone.\r\n\r\nVoltage limiting SPD: High impedance when there is no surge, and as the surge increases, the impedance continues to become smaller, such as varistor, suppression diode, etc., generally used in LPZ1, LPZ2 zone, etc.\r\n\r\nCombined SPD: It is composed of voltage switching type and voltage limiting type.\r\n\r\n<strong>4 Selection of surge protector<\/strong>\r\n\r\nThe cable of the SPD and the protected device should be as short as possible, within 0.5 m.\r\n\r\nWhen multiple SPDS are installed on the lines, the length of the cable between the voltage switching SPD and the voltage limiting SPD should not be less than 10m, and the length of the cable between the voltage limiting SPD should not be less than 5m.\r\n\r\nWhen the distance between the SPD and the protected device is greater than 30m, install another SPD as close as possible to the protected device.\r\n\r\nWhen choosing SPD, attention should be paid to ensure that the SPD will not burn due to power frequency overvoltage, because SPD is anti-transient overvoltage (\u03bcs level), power frequency overvoltage is ms level, the energy of power frequency overvoltage is hundreds of times transient overvoltage, therefore, attention should be paid to the selection of SPD with higher power frequency operating voltage.\r\n\r\nSPD protection: Each level of SPD should be protected, and can be protected by circuit breakers or fuses, and the breaking capacity of the protector is greater than the maximum short-circuit current.\r\n\r\nIn the anti-lightning, the shielding, grounding and equipotential measures of the building should be done first, and a reasonable evaluation of the project should be made to determine the expected maximum surge current that the system should withstand, and then the SPD is installed in common mode, differential mode or full-mode wiring according to different grounding forms, and the parameters of SPD are fully considered to match the protected equipment. At the same time, the rationality of its cost performance is investigated to achieve safety, applicability and economy."},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/it\/wp-json\/wp\/v2\/blog\/860","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/it\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/it\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/it\/wp-json\/wp\/v2\/media\/861"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/it\/wp-json\/wp\/v2\/media?parent=860"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/it\/wp-json\/wp\/v2\/blog_category?post=860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}