{"id":1172,"date":"2021-08-13T04:03:44","date_gmt":"2021-08-13T04:03:44","guid":{"rendered":"https:\/\/toancau.vn\/?p=1172"},"modified":"2025-04-17T08:26:49","modified_gmt":"2025-04-17T08:26:49","slug":"bao-ve-chong-set-cho-duong-day-dien-va-mot-so-diem-can-luu-y","status":"publish","type":"post","link":"https:\/\/toancau.vn\/en\/blog\/bao-ve-chong-set-cho-duong-day-dien-va-mot-so-diem-can-luu-y.html","title":{"rendered":"GUARD LIGHTNING PROTECTION FOR POWER LINES AND SOME POINTS TO NOTICE"},"content":{"rendered":"<p><span style=\"color: #000000;\">Khi v\u1eadn h\u00e0nh, m\u00e1y m\u00f3c b\u1ecb s\u1ef1 c\u1ed1 c\u1eaft \u0111i\u1ec7n, b\u1ecb nhi\u1ec5u do s\u00f3ng s\u00e9t x\u00e2m nh\u1eadp ho\u1eb7c khi \u0111ang l\u00e0m vi\u1ec7c, s\u00e9t \u0111\u00e1nh ch\u1ebft ng\u01b0\u1eddi l\u00e0 v\u1ea5n n\u1ea1n c\u1ea7n c\u00f3 bi\u1ec7n ph\u00e1p gi\u1ea3i quy\u1ebft. B\u1edfi v\u1eady, vi\u1ec7c <strong>lightning protection<\/strong> c\u00f3 t\u1ea7m quan tr\u1ecdng r\u1ea5t l\u1edbn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho con ng\u01b0\u1eddi, m\u00e1y m\u00f3c, c\u00f4ng tr\u00ecnh v\u00e0 nh\u00e0 \u1edf.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-3797 aligncenter\" src=\"https:\/\/toancau.vn\/wp-content\/uploads\/2021\/08\/bao-ve-chong-set-voi-duong-truyen-day-dien-1-300x300.jpg\" alt=\"\" width=\"326\" height=\"326\" srcset=\"https:\/\/toancau.vn\/wp-content\/uploads\/2021\/08\/bao-ve-chong-set-voi-duong-truyen-day-dien-1-300x300.jpg 300w, https:\/\/toancau.vn\/wp-content\/uploads\/2021\/08\/bao-ve-chong-set-voi-duong-truyen-day-dien-1-150x150.jpg 150w, https:\/\/toancau.vn\/wp-content\/uploads\/2021\/08\/bao-ve-chong-set-voi-duong-truyen-day-dien-1-12x12.jpg 12w, https:\/\/toancau.vn\/wp-content\/uploads\/2021\/08\/bao-ve-chong-set-voi-duong-truyen-day-dien-1.jpg 400w\" sizes=\"(max-width: 326px) 100vw, 326px\" \/><\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">Table of Contents<\/p><ul class=\"toc_list\"><li><a href=\"#1_Bao_ve_chong_set_danh_truc_tiep_vao_duong_day_tren_khong\"><span class=\"toc_number toc_depth_1\">1<\/span> 1. Protection against direct lightning strikes on overhead lines<\/a><\/li><li><a href=\"#2_Bao_ve_chong_tac_hai_cua_dong_set\"><span class=\"toc_number toc_depth_1\">2<\/span> \u00a02. Protection against the harmful effects of lightning current<\/a><\/li><li><a href=\"#3_Trang_bi_noi_dat\"><span class=\"toc_number toc_depth_1\">3<\/span> 3. Grounding equipment<\/a><\/li><li><a href=\"#4_Mot_so_diem_can_chu_y_khi_bao_ve_chong_set_danh_truc_tiep\"><span class=\"toc_number toc_depth_1\">4<\/span> 4. Some points to pay attention to when protecting against direct lightning strikes<\/a><\/li><\/ul><\/div>\n<h2><span id=\"1_Bao_ve_chong_set_danh_truc_tiep_vao_duong_day_tren_khong\"><span style=\"color: #000000;\"><strong>1. Protection against direct lightning strikes on overhead lines<\/strong><\/span><\/span><\/h2>\n<p><span style=\"color: #000000;\">To protect against lightning on overhead lines, it is best to hang lightning conductors on the entire line. But this method is very expensive, so it is only used for 110 - 220 kV transmission lines. Overhead power transmission lines with voltage of 35kV or less are less protected by lightning protection wires of the whole line.<\/span><\/p>\n<p><span style=\"color: #000000;\">To enhance the lightning protection for these lines, it is possible to install lightning arresters or increase ceramic bowls in places with weak insulation, high overhanging poles, intersections with other lines, and sections to substations. Power networks that require very high continuity of power supply are best served by cable lines.<\/span><\/p>\n<h2><span id=\"2_Bao_ve_chong_tac_hai_cua_dong_set\"><span style=\"color: #000000;\"><strong>\u00a02. Protection against the harmful effects of lightning current<\/strong><\/span><\/span><\/h2>\n<p><span style=\"color: #000000;\">The lightning surge current penetrates into the overhead line, threatens the line's insulation, and discharges between phases (to earth) or between phases, causing a sudden power cut. It is necessary to equip lightning protection devices such as lightning protection valves... to cut down the peak amplitude and completely drain the lightning energy to the ground safely. This will slightly reduce the line insulation and ensure higher power supply continuity.<\/span><\/p>\n<h2><span id=\"3_Trang_bi_noi_dat\"><span style=\"color: #000000;\"><strong>3. Grounding equipment<\/strong><\/span><\/span><\/h2>\n<p><span style=\"color: #000000;\">A serial lightning arrester is a device that conducts electricity to ground via a ground wire and a ground connection. The smaller our grounding resistance, the smaller the voltage at the lightning strike. If the special connection to the ground field cannot achieve the required number of values, then you can omit some position columns that are not connected to ground, but you must increase and strengthen the wire insulation to prevent the power from zooming through the position as well as the lines in the area. It is not recommended to ignore three consecutive positions on a wire.<\/span><\/p>\n<h2><span id=\"4_Mot_so_diem_can_chu_y_khi_bao_ve_chong_set_danh_truc_tiep\">4. Some points to pay attention to when protecting against direct lightning strikes<\/span><\/h2>\n<p><span style=\"color: #000000;\">\u2013 A direct lightning protection system, or straight lightning protection system, usually consists of a lightning conductor, a lightning conductor, and a grounding system. Lightning poles can be made of steel pipes, placed independently or right on the equipment to be protected. To ensure long-term durability, the cross-section of the wire should not be less than 50 mm2, the grounding resistance of the earthing system must be less than 10\u03a9.<\/span><br \/>\n<span style=\"color: #000000;\">\u2013 In order to ensure good contact, the contact points need to be welded, if bolts are used to arrest them, they must create a good contact surface, have anti-rust plating, and have a cross section greater than twice the wire cross section. Conductors are painted or coated with zinc to prevent rust.<\/span><br \/>\n<span style=\"color: #000000;\">\u2013 The lightning protection network must be periodically checked, especially in the periods before the rainy season.<\/span><br \/>\n<span style=\"color: #000000;\">\u2013 In addition, it is necessary to pay attention to the necessary distance between the lightning rod and the protected object. In general, all protected objects must be completely within the protection range of the air-termination pole, but at the same time they must be a certain distance away from the air-termination pole.<\/span><\/p>\n<p><span style=\"color: #000000;\"><em><span style=\"font-size: xx-small;\">(st)<\/span><\/em><\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Khi v\u1eadn h\u00e0nh, m\u00e1y m\u00f3c b\u1ecb s\u1ef1 c\u1ed1 c\u1eaft \u0111i\u1ec7n, b\u1ecb nhi\u1ec5u do s\u00f3ng s\u00e9t x\u00e2m nh\u1eadp ho\u1eb7c khi \u0111ang l\u00e0m vi\u1ec7c, s\u00e9t \u0111\u00e1nh ch\u1ebft ng\u01b0\u1eddi l\u00e0 v\u1ea5n n\u1ea1n c\u1ea7n c\u00f3 bi\u1ec7n ph\u00e1p gi\u1ea3i quy\u1ebft. B\u1edfi v\u1eady, vi\u1ec7c b\u1ea3o v\u1ec7 ch\u1ed1ng s\u00e9t c\u00f3 t\u1ea7m quan tr\u1ecdng r\u1ea5t l\u1edbn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho con [&hellip;]<\/p>","protected":false},"author":3,"featured_media":2819,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"rank_math_lock_modified_date":false,"footnotes":""},"categories":[16,7],"tags":[],"class_list":["post-1172","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-tin-tuc-su-kien"],"acf":[],"_links":{"self":[{"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/posts\/1172","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/comments?post=1172"}],"version-history":[{"count":2,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/posts\/1172\/revisions"}],"predecessor-version":[{"id":8453,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/posts\/1172\/revisions\/8453"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/media\/2819"}],"wp:attachment":[{"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/media?parent=1172"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/categories?post=1172"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/toancau.vn\/en\/wp-json\/wp\/v2\/tags?post=1172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}