{"id":702578,"date":"2024-11-19T15:28:10","date_gmt":"2024-11-19T14:28:10","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=702578"},"modified":"2024-11-19T15:28:10","modified_gmt":"2024-11-19T14:28:10","slug":"ro-le-nhiet-chuc-nang-bao-ve-qua-nhiet","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/ro-le-nhiet-chuc-nang-bao-ve-qua-nhiet\/","title":{"rendered":"R\u01a1 le nhi\u1ec7t | Ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 qu\u00e1 nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">R\u01a1 le nhi\u1ec7t | Ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 qu\u00e1 nhi\u1ec7t: T\u00ecm hi\u1ec3u c\u00e1ch r\u01a1 le nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng v\u00e0 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb kh\u1ecfi t\u00ecnh tr\u1ea1ng qu\u00e1 nhi\u1ec7t trong c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/ro_le_nhiet_chuc_nang_bao_ve_qua_nhiet.png\" alt=\"R\u01a1 le nhi\u1ec7t | Ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 qu\u00e1 nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>R\u01a1 le nhi\u1ec7t | Ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 qu\u00e1 nhi\u1ec7t<\/h2>\n<p>R\u01a1 le nhi\u1ec7t l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng trong l\u0129nh v\u1ef1c nhi\u1ec7t \u0111\u1ed9ng l\u1ef1c h\u1ecdc v\u00e0 k\u1ef9 thu\u1eadt nhi\u1ec7t, nh\u1eb1m b\u1ea3o v\u1ec7 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n kh\u1ecfi hi\u1ec7n t\u01b0\u1ee3ng qu\u00e1 nhi\u1ec7t. Ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a r\u01a1 le nhi\u1ec7t l\u00e0 gi\u00e1m s\u00e1t v\u00e0 ng\u1eaft d\u00f2ng \u0111i\u1ec7n khi nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng an to\u00e0n, \u0111\u1ea3m b\u1ea3o s\u1ef1 v\u1eadn h\u00e0nh \u1ed5n \u0111\u1ecbnh v\u00e0 an to\u00e0n c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<h2>Nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u1ee7a r\u01a1 le nhi\u1ec7t<\/h2>\n<p>R\u01a1 le nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean t\u1eafc gi\u00e3n n\u1edf nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean do qu\u00e1 t\u1ea3i \u0111i\u1ec7n ho\u1eb7c m\u00f4i tr\u01b0\u1eddng xung quanh, c\u00e1c v\u1eadt li\u1ec7u trong r\u01a1 le s\u1ebd gi\u00e3n n\u1edf. S\u1ef1 gi\u00e3n n\u1edf n\u00e0y t\u1ea1o ra m\u1ed9t l\u1ef1c c\u01a1 h\u1ecdc t\u00e1c \u0111\u1ed9ng l\u00ean ch\u1ed1t kh\u00f3a ho\u1eb7c c\u00f4ng t\u1eafc b\u00ean trong r\u01a1 le v\u00e0 l\u00e0m ng\u1eaft m\u1ea1ch \u0111i\u1ec7n.<\/p>\n<h2>C\u00e1c lo\u1ea1i r\u01a1 le nhi\u1ec7t<\/h2>\n<ul>\n<li><b>R\u01a1 le nhi\u1ec7t bimetall:<\/b> S\u1eed d\u1ee5ng hai thanh kim lo\u1ea1i c\u00f3 h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t kh\u00e1c nhau gh\u00e9p l\u1ea1i. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, s\u1ef1 gi\u00e3n n\u1edf kh\u00f4ng \u0111\u1ec1u c\u1ee7a hai thanh n\u00e0y s\u1ebd t\u1ea1o ra m\u1ed9t l\u1ef1c u\u1ed1n cong l\u00e0m ng\u1eaft m\u1ea1ch.<\/li>\n<li><b>R\u01a1 le nhi\u1ec7t \u0111i\u1ec7n tr\u1edf:<\/b> S\u1eed d\u1ee5ng c\u00e1c \u0111i\u1ec7n tr\u1edf nhi\u1ec7t (thermistor) \u0111\u1ec3 \u0111o nhi\u1ec7t \u0111\u1ed9. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, tr\u1ecb s\u1ed1 \u0111i\u1ec7n tr\u1edf c\u1ee7a thermistor thay \u0111\u1ed5i, k\u00edch ho\u1ea1t m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 ng\u1eaft d\u00f2ng \u0111i\u1ec7n.<\/li>\n<\/ul>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a r\u01a1 le nhi\u1ec7t<\/h2>\n<p>R\u01a1 le nhi\u1ec7t c\u00f3 m\u1eb7t trong h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb v\u00e0 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u0111\u1ec3 cung c\u1ea5p s\u1ef1 b\u1ea3o v\u1ec7 quan tr\u1ecdng:<\/p>\n<ol>\n<li>M\u00e1y n\u00e9n kh\u00ed<\/li>\n<li>\u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n<\/li>\n<li>M\u1ea1ch \u0111i\u1ec7n c\u00f4ng nghi\u1ec7p<\/li>\n<li>B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n t\u1eed<\/li>\n<\/ol>\n<h2>T\u1ea1i sao vi\u1ec7c b\u1ea3o v\u1ec7 qu\u00e1 nhi\u1ec7t l\u00e0 quan tr\u1ecdng?<\/h2>\n<p>Qu\u00e1 nhi\u1ec7t c\u00f3 th\u1ec3 g\u00e2y ra nhi\u1ec1u v\u1ea5n \u0111\u1ec1 nghi\u00eam tr\u1ecdng nh\u01b0:<\/p>\n<ul>\n<li>H\u1ecfng h\u00f3c thi\u1ebft b\u1ecb<\/li>\n<li>Ch\u00e1y n\u1ed5<\/li>\n<li>Gi\u1ea3m tu\u1ed5i th\u1ecd c\u1ee7a m\u00e1y m\u00f3c<\/li>\n<li>T\u0103ng nguy c\u01a1 tai n\u1ea1n lao \u0111\u1ed9ng v\u00e0 t\u1ed5n h\u1ea1i con ng\u01b0\u1eddi<\/li>\n<\/ul>\n<h2>C\u00e1ch t\u0103ng c\u01b0\u1eddng hi\u1ec7u su\u1ea5t c\u1ee7a r\u01a1 le nhi\u1ec7t<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o r\u01a1 le nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3, c\u1ea7n l\u01b0u \u00fd c\u00e1c y\u1ebfu t\u1ed1 sau:<\/p>\n<ul>\n<li>Ch\u1ecdn lo\u1ea1i r\u01a1 le c\u00f3 ng\u01b0\u1ee1ng nhi\u1ec7t ph\u00f9 h\u1ee3p v\u1edbi thi\u1ebft b\u1ecb<\/li>\n<li>\u0110\u1ea3m b\u1ea3o m\u00f4i tr\u01b0\u1eddng xung quanh r\u01a1 le lu\u00f4n th\u00f4ng tho\u00e1ng<\/li>\n<li>B\u1ea3o tr\u00ec v\u00e0 ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3<\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>R\u01a1 le nhi\u1ec7t \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong b\u1ea3o v\u1ec7 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n kh\u1ecfi nguy c\u01a1 qu\u00e1 nhi\u1ec7t, gi\u00fap \u0111\u1ea3m b\u1ea3o s\u1ef1 an to\u00e0n v\u00e0 \u1ed5n \u0111\u1ecbnh cho c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n v\u00e0 c\u00f4ng nghi\u1ec7p. Hi\u1ec3u r\u00f5 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng, \u1ee9ng d\u1ee5ng v\u00e0 c\u00e1ch b\u1ea3o tr\u00ec r\u01a1 le nhi\u1ec7t s\u1ebd gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u00e0 tu\u1ed5i th\u1ecd cho c\u00e1c thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R\u01a1 le nhi\u1ec7t | Ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 qu\u00e1 nhi\u1ec7t: T\u00ecm hi\u1ec3u c\u00e1ch r\u01a1 le nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng v\u00e0 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb kh\u1ecfi t\u00ecnh tr\u1ea1ng qu\u00e1 nhi\u1ec7t trong c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R\u01a1 le nhi\u1ec7t 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