{"id":801,"date":"2023-12-19T16:44:04","date_gmt":"2023-12-19T08:44:04","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&#038;p=801"},"modified":"2024-09-05T16:34:00","modified_gmt":"2024-09-05T08:34:00","slug":"the-difference-between-lightning-protection-and-surge-protection","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/fr\/blog\/the-difference-between-lightning-protection-and-surge-protection\/","title":{"rendered":"La diff\u00e9rence entre la protection contre la foudre et la protection contre les surtensions"},"content":{"rendered":"Lightning and surge protection are two elements of an effective electrical protection system.\r\n\r\nLightning is known to be the most significant source of surges\u2014bolts have been recorded to have a million to a billion volts and between 10,000 to 200,000 amps. However, lightning only makes up a portion of all transient events in a facility.\r\n\r\nBecause transients can originate from both external sources (like lightning) and internal sources, facilities ought to have both a lightning protection system and surge protection installed.\r\n\r\n<strong>Syst\u00e8me de protection contre la foudre<\/strong>\r\n\r\nA lightning protection system protects a structure from a direct lightning strike.\r\n\r\nTo do this, an air terminal (or system of air terminals) is placed in the most probable position to capture the direct strike, based on the structure\u2019s architectural design and roof equipment. The rest of the system is designed to safely convey that electrical energy from the lighting strike to ground as efficiently and safely as possible.\r\n\r\nTo intercept the strike and conduct the high current energy of a lightning strike into the earth, system components include the:\r\n\r\nAir terminal, which is used to intercept the lightning strike.\r\n\r\nDown conductors, providing the most direct path possible to move the electrical energy towards the ground.\r\n\r\nGrounding system, which provides a path for the current to dissipate into the ground and out of harm\u2019s way.\r\n\r\nBonding, meant to reduce the possibility of voltage differences that are a safety risk.\r\n\r\nLightning protection standards ensure how to properly place air terminals, run cable, ground and bond in order to ensure maximum safety in this energy transfer and dissipation.\r\n\r\n<strong>Dispositif de protection contre les surtensions (SPD)<\/strong>\r\n\r\nUn dispositif de protection contre les surtensions (SPD) est con\u00e7u pour prot\u00e9ger les syst\u00e8mes et \u00e9quipements \u00e9lectriques contre les surtensions et les \u00e9v\u00e9nements transitoires en limitant les tensions transitoires et en d\u00e9tournant les courants de surtension.\r\n\r\n<strong>Quelles sont les causes des transitoires et des surtensions\u00a0?<\/strong>\r\n\r\nLightning is the most spectacular form of an externally generated surge, however, it is estimated that 65% of all transients are generated internally within the facility by the switching of electrical loads such as:\r\n\r\nLightnings\r\n\r\nHeating systems\r\n\r\nMotors\r\n\r\nOther Inductive loads\r\n\r\n<strong>Comment fonctionne un SPD ?<\/strong>\r\n\r\nIl existe au moins un composant non lin\u00e9aire du SPD qui, dans diff\u00e9rentes conditions, effectue une transition entre un \u00e9tat d'imp\u00e9dance \u00e9lev\u00e9e et faible. Aux tensions de fonctionnement normales, les SPD sont dans un \u00e9tat d'imp\u00e9dance \u00e9lev\u00e9e et n'affectent pas le syst\u00e8me. Lorsqu'une tension transitoire appara\u00eet sur le circuit, le SPD passe dans un \u00e9tat de conduction (ou de faible imp\u00e9dance) et d\u00e9tourne l'\u00e9nergie et le courant transitoires vers sa source ou la masse. Cela limite ou fixe l'amplitude de tension \u00e0 un niveau plus s\u00fbr. Apr\u00e8s leLe transitoire est d\u00e9vi\u00e9, le SPD se r\u00e9initialise automatiquement \u00e0 son \u00e9tat de haute imp\u00e9dance.\r\n\r\n<strong>Qu\u2019est-ce qui distingue les deux syst\u00e8mes ?<\/strong>\r\n\r\nOn a basic level, the lightning protection system protects the facility and structure from direct strikes, while SPDs protect electrical equipment and systems against surges or transients.\r\n\r\nHow the two operate, and the components involved, also vary. Lightning protection system components are always in place and ready to function, while SPDs monitor internal system voltages and spring into action if a transient voltage occurs on the circuit.","protected":false},"featured_media":802,"parent":0,"menu_order":174,"template":"","meta":{"_acf_changed":false},"blog_category":[8],"class_list":["post-801","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-company-news"],"acf":{"des":"Lightning and surge protection are two elements of an effective electrical protection system.","txt":"Lightning and surge protection are two elements of an effective electrical protection system.\r\n\r\nLightning is known to be the most significant source of surges\u2014bolts have been recorded to have a million to a billion volts and between 10,000 to 200,000 amps. However, lightning only makes up a portion of all transient events in a facility.\r\n\r\nBecause transients can originate from both external sources (like lightning) and internal sources, facilities ought to have both a lightning protection system and surge protection installed.\r\n\r\n<strong>Lightning Protection System<\/strong>\r\n\r\nA lightning protection system protects a structure from a direct lightning strike.\r\n\r\nTo do this, an air terminal (or system of air terminals) is placed in the most probable position to capture the direct strike, based on the structure\u2019s architectural design and roof equipment. The rest of the system is designed to safely convey that electrical energy from the lighting strike to ground as efficiently and safely as possible.\r\n\r\nTo intercept the strike and conduct the high current energy of a lightning strike into the earth, system components include the:\r\n\r\nAir terminal, which is used to intercept the lightning strike.\r\n\r\nDown conductors, providing the most direct path possible to move the electrical energy towards the ground.\r\n\r\nGrounding system, which provides a path for the current to dissipate into the ground and out of harm\u2019s way.\r\n\r\nBonding, meant to reduce the possibility of voltage differences that are a safety risk.\r\n\r\nLightning protection standards ensure how to properly place air terminals, run cable, ground and bond in order to ensure maximum safety in this energy transfer and dissipation.\r\n\r\n<strong>Surge Protective Device (SPD)<\/strong>\r\n\r\nA surge protective device (SPD) is designed to protect electrical systems and equipment from surge and transient events by limiting transient voltages and diverting surge currents.\r\n\r\n<strong>What causes transients and surges?<\/strong>\r\n\r\nLightning is the most spectacular form of an externally generated surge, however, it is estimated that 65% of all transients are generated internally within the facility by the switching of electrical loads such as:\r\n\r\nLightnings\r\n\r\nHeating systems\r\n\r\nMotors\r\n\r\nOther Inductive loads\r\n\r\n<strong>How does a SPD work?<\/strong>\r\n\r\nThere is at least one non-linear component of the SPD, which under different conditions, transitions between a high and low impedance state. At normal operating voltages, the SPDs are in a high impedance state and do not affect the system. When a transient voltage occurs on the circuit, the SPD moves into a state of conduction (or low impedance) and diverts the transient energy and current back to its source or ground. This limits or clamps the voltage amplitude to a safer level. After the transient is diverted, the SPD automatically resets back to its high impedance state.\r\n\r\n<strong>What Sets the Two Systems Apart?<\/strong>\r\n\r\nOn a basic level, the lightning protection system protects the facility and structure from direct strikes, while SPDs protect electrical equipment and systems against surges or transients.\r\n\r\nHow the two operate, and the components involved, also vary. Lightning protection system components are always in place and ready to function, while SPDs monitor internal system voltages and spring into action if a transient voltage occurs on the circuit."},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/blog\/801","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/media\/802"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/media?parent=801"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/blog_category?post=801"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}