{"id":4655,"date":"2026-11-02T17:58:08","date_gmt":"2026-11-02T17:58:08","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=4655"},"modified":"2026-11-02T17:58:10","modified_gmt":"2026-11-02T17:58:10","slug":"what-is-a-motor-overload-relay","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/what-is-a-motor-overload-relay\/","title":{"rendered":"R\u01a1 le qu\u00e1 t\u1ea3i \u0111\u1ed9ng c\u01a1 l\u00e0 g\u00ec?"},"content":{"rendered":"<p>Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n kh\u00f4ng b\u1ecb h\u01b0 h\u1ecfng do ng\u1eafn m\u1ea1ch. Th\u00f4ng th\u01b0\u1eddng, ch\u00fang ng\u1eebng ho\u1ea1t \u0111\u1ed9ng do qu\u00e1 nhi\u1ec7t v\u00ec v\u1eadn h\u00e0nh li\u00ean t\u1ee5c \u1edf 110% c\u1ee7a d\u00f2ng \u0111\u1ecbnh m\u1ee9c trong 40 ph\u00fat do \u1ed5 bi kh\u00f4 ho\u1eb7c d\u00f2ng ch\u1ea3y b\u1ecb h\u1ea1n ch\u1ebf qua b\u01a1m ho\u1eb7c c\u00e1c l\u1ed7i t\u01b0\u01a1ng t\u1ef1 kh\u00e1c kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n cho \u0111\u1ebfn khi l\u1edbp c\u00e1ch \u0111i\u1ec7n cu\u1ed9n d\u00e2y b\u1ecb h\u1ecfng. Thi\u1ebft b\u1ecb duy nh\u1ea5t c\u00f3 kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1 l\u00e0 r\u01a1 le qu\u00e1 t\u1ea3i, \u0111\u00e2y l\u00e0 b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 r\u1ebb nh\u1ea5t c\u1ee7a b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1.<\/p>\n<p>Th\u00f4ng tin d\u01b0\u1edbi \u0111\u00e2y gi\u1ea3i th\u00edch r\u01a1 le qu\u00e1 t\u1ea3i cung c\u1ea5p g\u00ec trong m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1, c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1eebng lo\u1ea1i r\u01a1 le, c\u00e1c l\u1edbp ng\u1eaft c\u1ea7n ch\u1ecdn, nguy\u00ean nh\u00e2n g\u00e2y ng\u1eaft v\u00e0 c\u00e1ch c\u00e0i \u0111\u1eb7t r\u01a1 le.<\/p>\n<blockquote><p>N\u00f3i ng\u1eafn g\u1ecdn, r\u01a1 le qu\u00e1 t\u1ea3i \u0111\u1ed9ng c\u01a1 l\u00e0 thi\u1ebft b\u1ecb trong b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 \u0111o d\u00f2ng \u0111i\u1ec7n v\u00e0 ng\u1eaft m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n n\u1ebfu \u0111\u1ed9ng c\u01a1 ti\u00eau th\u1ee5 d\u00f2ng \u0111i\u1ec7n qu\u00e1 l\u1edbn trong th\u1eddi gian d\u00e0i. Do \u0111\u00f3, thi\u1ebft b\u1ecb n\u00e0y kh\u00f4ng cung c\u1ea5p b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1edfi c\u1ea7u dao. Lo\u1ea1i nhi\u1ec7t s\u1eed d\u1ee5ng d\u1ea3i kim lo\u1ea1i k\u00e9p \u0111\u01b0\u1ee3c l\u00e0m n\u00f3ng b\u1edfi d\u00f2ng \u0111i\u1ec7n, trong khi lo\u1ea1i \u0111i\u1ec7n t\u1eed d\u1ef1a v\u00e0o bi\u1ebfn d\u00f2ng v\u00e0 m\u00f4 h\u00ecnh \u0111\u1ed9ng c\u01a1. C\u00e0i \u0111\u1eb7t l\u00e0 d\u00f2ng \u0111\u1ecbnh m\u1ee9c c\u1ee7a \u0111\u1ed9ng c\u01a1, trong khi l\u1edbp ng\u1eaft \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a \u1edf m\u1ee9c 7,2 l\u1ea7n d\u00f2ng \u0111\u00f3 ph\u1ea3i xem x\u00e9t th\u1eddi gian kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1.<\/p><\/blockquote>\n<h2>R\u01a1 le Qu\u00e1 T\u1ea3i L\u00e0m G\u00ec Trong M\u1ea1ch \u0110i\u1ec1u Khi\u1ec3n \u0110\u1ed9ng C\u01a1<\/h2>\n<p>R\u01a1 le qu\u00e1 t\u1ea3i \u0111i\u1ec7n c\u00f3 vai tr\u00f2 c\u1ee5 th\u1ec3 trong \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1. M\u1ee5c \u0111\u00edch c\u1ee7a r\u01a1 le qu\u00e1 t\u1ea3i trong h\u1ec7 th\u1ed1ng l\u00e0 b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 ch\u1ed1ng ch\u00e1y cu\u1ed9n d\u00e2y h\u01a1n l\u00e0 b\u1ea3o v\u1ec7 c\u00e1p ho\u1eb7c contactor. \u0110i\u1ec1u n\u00e0y gi\u1ea3i th\u00edch r\u1ea5t nhi\u1ec1u trong qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t thi\u1ebft b\u1ecb n\u00e0y.<\/p>\n<p>B\u1ed9 b\u1ea3o v\u1ec7 s\u1ebd ho\u1ea1t \u0111\u1ed9ng trong c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c nhau, v\u00ec v\u1eady m\u1ed7i thi\u1ebft b\u1ecb s\u1ebd ch\u1ecbu tr\u00e1ch nhi\u1ec7m cho lo\u1ea1i s\u1ef1 c\u1ed1 c\u1ee7a n\u00f3. Lo\u1ea1i \u0111\u1ea7u ti\u00ean l\u00e0 thi\u1ebft b\u1ecb ng\u1eafn m\u1ea1ch nh\u01b0 c\u1ea7u ch\u00ec v\u00e0 c\u1ea7u dao v\u1ecf \u0111\u00fac c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c d\u00f2ng ng\u1eafn m\u1ea1ch l\u00ean \u0111\u1ebfn h\u00e0ng ngh\u00ecn ampe trong v\u00e0i mili gi\u00e2y. Lo\u1ea1i b\u1ea3o v\u1ec7 th\u1ee9 hai l\u00e0 contactor s\u1eed d\u1ee5ng c\u00f4ng t\u1eafc \u0111i\u1ec7n khi b\u1eadt t\u1ea3i. R\u01a1 le qu\u00e1 t\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng gi\u1eefa hai thi\u1ebft b\u1ecb n\u00e0y \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh khi \u0111\u1ed9ng c\u01a1 ho\u1ea1t \u0111\u1ed9ng trong \u0111i\u1ec1u ki\u1ec7n cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 b\u1ecb h\u1ecfng v\u00e0 \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t.<\/p>\n<p>V\u00ec v\u1eady, n\u00f3 ho\u1ea1t \u0111\u1ed9ng theo ch\u1ee9c n\u0103ng ch\u00ednh v\u00e0 kh\u00f4ng cho ph\u00e9p \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t ho\u1eb7c b\u1ecb h\u01b0 h\u1ecfng. Khi ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1, r\u01a1 le m\u1edf m\u1ed9t ti\u1ebfp \u0111i\u1ec3m nh\u1ecf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ea1ch contactor. Sau khi ti\u1ebfp \u0111i\u1ec3m contactor ng\u1eaft, \u0111\u1ed9ng c\u01a1 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng nh\u01b0ng r\u01a1 le c\u1ea7n \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ea1i b\u1eb1ng tay.<\/p>\n<p>Th\u1ef1c t\u1ebf, r\u01a1 le b\u1ea3o v\u1ec7 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ee7a \u0111\u1ed9ng c\u01a1 v\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ec9 l\u00e0 ch\u1ec9 b\u00e1o gi\u00e1n ti\u1ebfp c\u1ee7a n\u00f3. N\u1ebfu \u0111\u1ed9ng c\u01a1 ch\u1ea1y n\u00f3ng, r\u01a1 le s\u1ebd kh\u00f3 ng\u1eaft \u0111\u1ed9ng c\u01a1 h\u01a1n so v\u1edbi khi thi\u1ebft b\u1ecb ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 l\u1ea1nh v\u00ec n\u00f3 ph\u1ea3i t\u00ednh \u0111\u1ebfn nhi\u1ec7t t\u00edch t\u1ee5 c\u1ee7a \u0111\u1ed9ng c\u01a1 tr\u01b0\u1edbc khi v\u1eadn h\u00e0nh.<\/p>\n<p>Th\u1ef1c t\u1ebf cho th\u1ea5y n\u1ebfu \u0111\u1ed9ng c\u01a1 c\u00f3 b\u1ea3o v\u1ec7 th\u00edch h\u1ee3p, k\u00edch th\u01b0\u1edbc c\u1ee7a r\u01a1 le kh\u00f4ng quan tr\u1ecdng. V\u1ea5n \u0111\u1ec1 ch\u00ednh v\u1edbi r\u01a1 le l\u00e0 n\u00f3 c\u00f3 ho\u1ea1t \u0111\u1ed9ng hay kh\u00f4ng, vi\u1ec7c t\u0103ng c\u00f4ng su\u1ea5t r\u01a1 le kh\u00f4ng c\u00f3 \u00fd ngh\u0129a g\u00ec tr\u1eeb khi nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5 c\u1ee7a s\u1ef1 c\u1ed1 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n. Phi\u00ean b\u1ea3n t\u00edch h\u1ee3p c\u1ee7a to\u00e0n b\u1ed9 b\u1ed9 ph\u1eadn, g\u1ed3m contactor c\u1ed9ng v\u1edbi qu\u00e1 t\u1ea3i c\u1ed9ng v\u1edbi v\u1ecf b\u1ea3o v\u1ec7, ch\u00ednh l\u00e0 m\u1ed9t <a href=\"https:\/\/huyuglobal.com\/vi\/product\/exq7-electromagnetic-starter\/\">b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 lo\u1ea1i n\u00e0y<\/a> \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i, v\u00e0 mua n\u00f3 nh\u01b0 m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t lo\u1ea1i b\u1ecf r\u1ee7i ro kh\u00f4ng kh\u1edbp gi\u1eefa contactor v\u00e0 r\u01a1 le g\u00e2y ra h\u1ea7u h\u1ebft c\u00e1c l\u1ed7i l\u1eafp \u0111\u1eb7t.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4657\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/11\/What-an-Overload-Relay-Does-in-a-Motor-Control-Circuit.webp\" alt=\"R\u01a1 le Qu\u00e1 T\u1ea3i L\u00e0m G\u00ec Trong M\u1ea1ch \u0110i\u1ec1u Khi\u1ec3n \u0110\u1ed9ng C\u01a1\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a R\u01a1 le Qu\u00e1 t\u1ea3i \u0110\u1ed9ng c\u01a1, theo t\u1eebng lo\u1ea1i<\/h2>\n<p>Th\u1ecb tr\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1eb7c tr\u01b0ng b\u1edfi hai c\u01a1 ch\u1ebf ch\u1ee7 \u0111\u1ea1o v\u00e0 m\u1ed9t c\u01a1 ch\u1ebf m\u1edbi xu\u1ea5t hi\u1ec7n g\u1ea7n \u0111\u00e2y.<\/p>\n<ul>\n<li>Lo\u1ea1i \u0111\u1ea7u ti\u00ean l\u00e0 Bimetal, s\u1eed d\u1ee5ng nhi\u1ec7t gi\u00e1n ti\u1ebfp. M\u1ed7i pha \u0111i qua m\u1ed9t ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c l\u00e0m n\u00f3ng b\u1edfi th\u00e0nh ph\u1ea7n bimetal, bao g\u1ed3m hai kim lo\u1ea1i kh\u00e1c nhau gi\u00e3n n\u1edf v\u1edbi t\u1ed1c \u0111\u1ed9 kh\u00e1c nhau n\u00ean n\u00f3 u\u1ed1n cong khi n\u00f3ng. Khi u\u1ed1n cong, n\u00f3 t\u00e1c \u0111\u1ed9ng l\u00ean thanh t\u1ed5ng h\u1ee3p v\u00e0 m\u1ed9t c\u1ea7n g\u1ea1t, gi\u1ea3i ph\u00f3ng c\u01a1 ch\u1ebf b\u1eadt v\u00e0 m\u1edf ti\u1ebfp \u0111i\u1ec3m 95-96. Nhi\u1ec7t gi\u00e1n ti\u1ebfp c\u00f3 ngh\u0129a l\u00e0 b\u1ed9 gia nhi\u1ec7t ch\u1ecbu tr\u00e1ch nhi\u1ec7m l\u00e0m n\u00f3ng bimetal thay v\u00ec d\u00f2ng \u0111i\u1ec7n truy\u1ec1n nhi\u1ec7t qua bimetal. \u01afu \u0111i\u1ec3m l\u00e0 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t khung cho c\u00e1c m\u1ee9c d\u00f2ng \u0111i\u1ec7n kh\u00e1c nhau b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i b\u1ed9 gia nhi\u1ec7t. K\u1ebft qu\u1ea3 c\u1ee7a thi\u1ebft k\u1ebf n\u00e0y l\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u \u1ee9ng th\u1eddi gian ngh\u1ecbch \u0111\u1ea3o. \u1ede d\u00f2ng \u0111i\u1ec7n g\u1ea5p \u0111\u00f4i \u0111\u1ecbnh m\u1ee9c, bimetal u\u1ed1n cong ch\u1eadm, \u1edf d\u00f2ng \u0111i\u1ec7n g\u1ea5p s\u00e1u l\u1ea7n th\u00ec u\u1ed1n cong nhanh. \u0110i\u1ec1u n\u00e0y t\u01b0\u01a1ng \u1ee9ng v\u1edbi h\u00e0nh vi v\u1eadt l\u00fd c\u1ee7a \u0111\u1ed9ng c\u01a1, c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu d\u00f2ng \u0111i\u1ec7n cao trong th\u1eddi gian ng\u1eafn v\u00e0 ch\u1ea1y kh\u00f4ng t\u1ea3i v\u1edbi d\u00f2ng \u0111i\u1ec7n th\u1ea5p. C\u00f3 m\u1ed9t bimetal kh\u00e1c \u0111\u1ec3 b\u00f9 nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng nh\u1eb1m lo\u1ea1i b\u1ecf \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 xung quanh.<\/li>\n<li>Lo\u1ea1i th\u1ee9 hai l\u00e0 \u0110i\u1ec7n t\u1eed. Bi\u1ebfn d\u00f2ng gi\u00e1m s\u00e1t gi\u00e1 tr\u1ecb d\u00f2ng \u0111i\u1ec7n cho m\u1ed7i pha, v\u00e0 d\u1ef1a tr\u00ean \u0111\u00f3 m\u1ed9t m\u1ea1ch \u0111i\u1ec7n t\u1eed \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh theo m\u00f4 h\u00ecnh nhi\u1ec7t v\u00e0 k\u00edch ho\u1ea1t m\u1ed9t r\u01a1 le nh\u1ecf ho\u1eb7c m\u1ed9t transistor \u0111\u00f3ng m\u1ea1ch. Qu\u00e1 tr\u00ecnh n\u00e0y kh\u00f4ng c\u00f3 b\u1ed9 gia nhi\u1ec7t \u2013 v\u00e0 DVR c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i c\u00e1c d\u00f2ng \u0111i\u1ec7n kh\u00e1c nhau ch\u1ec9 b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i c\u00e0i \u0111\u1eb7t. C\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u01b0 v\u1eady \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1, k\u1ebft h\u1ee3p trong m\u1ed9t thi\u1ebft b\u1ecb c\u00e1c ch\u1ee9c n\u0103ng c\u1ee7a thi\u1ebft b\u1ecb ng\u1eafn m\u1ea1ch t\u1eeb t\u00ednh v\u00e0 qu\u00e1 t\u1ea3i nhi\u1ec7t.<\/li>\n<\/ul>\n<p>B\u1ea5t k\u1ec3 lo\u1ea1i b\u1ea3o v\u1ec7 n\u00e0o \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, k\u1ebft n\u1ed1i \u0111i\u1ec7n l\u00e0 gi\u1ed1ng nhau: c\u00e1c \u0111\u1ea7u n\u1ed1i 95-96 l\u00e0 ti\u1ebfp \u0111i\u1ec3m nh\u1ea3 th\u01b0\u1eddng \u0111\u00f3ng \u0111\u01b0\u1ee3c n\u1ed1i n\u1ed1i ti\u1ebfp v\u1edbi cu\u1ed9n d\u00e2y contactor trong khi c\u00e1c \u0111\u1ea7u n\u1ed1i 97-98 th\u01b0\u1eddng m\u1edf v\u00e0 \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m ti\u1ebfp \u0111i\u1ec3m b\u00e1o hi\u1ec7u ho\u1eb7c \u0111\u1ec3 b\u00e1o t\u00edn hi\u1ec7u cho PLC. R\u01a1 le \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i qua c\u00e1c \u0111\u1ea7u n\u1ed1i 97-98 thay v\u00ec 95-96 s\u1ebd kh\u00f4ng bao gi\u1edd nh\u1ea3, v\u00e0 l\u1ed7i n\u00e0y x\u1ea3y ra kh\u00e1 th\u01b0\u1eddng xuy\u00ean n\u00ean c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra b\u1eb1ng \u0111\u1ed3ng h\u1ed3 m\u1ed7i khi nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t t\u1ee7 \u0111i\u1ec7n. Ph\u00eda cu\u1ed9n d\u00e2y c\u1ee7a c\u00f9ng m\u1ea1ch \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong c\u00e1c <a href=\"https:\/\/huyuglobal.com\/vi\/product\/exc7-ac-contactor\/\">th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt contactor AC<\/a>, cung c\u1ea5p \u0111i\u1ec7n \u00e1p cu\u1ed9n d\u00e2y m\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n ph\u1ea3i ph\u00f9 h\u1ee3p.<\/p>\n<h2>Qu\u00e1 t\u1ea3i Nhi\u1ec7t hay \u0110i\u1ec7n t\u1eed: So s\u00e1nh Trung th\u1ef1c<\/h2>\n<p>C\u1ea3 hai \u0111\u1ec1u l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00fang cho c\u00e1c c\u00f4ng vi\u1ec7c kh\u00e1c nhau, v\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 gi\u00e1 nh\u1ecf h\u01a1n s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 t\u00ednh n\u0103ng.<\/p>\n<table>\n<thead>\n<tr>\n<th>Y\u1ebfu t\u1ed1<\/th>\n<th>Nhi\u1ec7t (bimetal)<\/th>\n<th>\u0110i\u1ec7n t\u1eed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u1ed9 ch\u00ednh x\u00e1c<\/td>\n<td>\u00b110% \u0111\u1ebfn 20% quanh c\u00e0i \u0111\u1eb7t<\/td>\n<td>Th\u00f4ng th\u01b0\u1eddng \u00b15% ho\u1eb7c t\u1ed1t h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>B\u00f9 m\u00f4i tr\u01b0\u1eddng<\/td>\n<td>\u221220 \u0111\u1ebfn +60 \u00b0C tr\u00ean h\u1ea7u h\u1ebft c\u00e1c khung<\/td>\n<td>\u221225 \u0111\u1ebfn +60 \u00b0C, r\u1ed9ng h\u01a1n tr\u00ean m\u1ed9t s\u1ed1<\/td>\n<\/tr>\n<tr>\n<td>L\u1edbp ng\u1eaft<\/td>\n<td>C\u1ed1 \u0111\u1ecbnh khi mua, th\u01b0\u1eddng l\u00e0 L\u1edbp 10<\/td>\n<td>C\u00f3 th\u1ec3 ch\u1ecdn, th\u01b0\u1eddng t\u1eeb 5E \u0111\u1ebfn 30E<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 nh\u1edb nhi\u1ec7t<\/td>\n<td>B\u1eb1ng l\u00e0m m\u00e1t v\u1eadt l\u00fd, \u0111i\u1ec1u n\u00e0y l\u00e0 th\u1ef1c t\u1ebf<\/td>\n<td>Theo m\u00f4 h\u00ecnh v\u00e0 tr\u1ea1ng th\u00e1i l\u01b0u tr\u1eef<\/td>\n<\/tr>\n<tr>\n<td>Ch\u1ea9n \u0111o\u00e1n<\/td>\n<td>Ng\u1eaft ho\u1eb7c kh\u00f4ng ng\u1eaft<\/td>\n<td>D\u00f2ng \u0111i\u1ec7n m\u1ed7i pha, t\u1ea3i nhi\u1ec7t, nguy\u00ean nh\u00e2n ng\u1eaft<\/td>\n<\/tr>\n<tr>\n<td>Gi\u00e1<\/td>\n<td>Th\u1ea5p nh\u1ea5t<\/td>\n<td>Hai \u0111\u1ebfn n\u0103m l\u1ea7n nhi\u1ec7t, gi\u1ea3m d\u1ea7n<\/td>\n<\/tr>\n<tr>\n<td>Ph\u00f9 h\u1ee3p nh\u1ea5t cho<\/td>\n<td>B\u01a1m ti\u00eau chu\u1ea9n, qu\u1ea1t, b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u01a1n gi\u1ea3n<\/td>\n<td>\u1ed4 \u0111\u0129a quan tr\u1ecdng, t\u1ea3i qu\u00e1n t\u00ednh cao, nh\u00e0 m\u00e1y m\u1ea1ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a r\u01a1 le nhi\u1ec7t l\u00e0 n\u00f3 s\u1eed d\u1ee5ng bimetal ho\u1ea1t \u0111\u1ed9ng gi\u1ed1ng nh\u01b0 \u0111\u1ed9ng c\u01a1 nh\u01b0ng kh\u00f4ng lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c c\u00e1c h\u1ea1n ch\u1ebf c\u1ee7a n\u00f3. R\u01a1 le nhi\u1ec7t kh\u00f4ng ch\u1ec9 ra nguy\u00ean nh\u00e2n ng\u1eaft v\u00e0 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec7t \u0111\u1ed9 trong t\u1ee7 \u0111i\u1ec7n. H\u01a1n n\u1eefa, \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a r\u01a1 le nhi\u1ec7t b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 dung sai c\u1ee7a b\u1ed9 gia nhi\u1ec7t.<\/p>\n<p>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a r\u01a1 le \u0111i\u1ec7n t\u1eed l\u00e0 ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e0i \u0111\u1eb7t ch\u00ednh x\u00e1c v\u00e0 ngu\u1ed3n \u0111i\u1ec7n. N\u1ebfu c\u00f3 s\u1ef1 c\u1ed1 v\u1edbi \u0111\u1ea7u ra, s\u1ebd kh\u00f4ng ph\u00e1t t\u00edn hi\u1ec7u. Tuy nhi\u00ean, c\u00f3 l\u1ee3i \u00edch do c\u00e1c s\u1ed1 li\u1ec7u thu \u0111\u01b0\u1ee3c t\u1eeb r\u01a1 le \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ed9i b\u1ea3o tr\u00ec s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c. H\u00e0nh vi c\u1ee7a ph\u00eda contactor d\u01b0\u1edbi c\u00f9ng m\u1ed9t nhi\u1ec7m v\u1ee5 \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong c\u00e1c <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/alternating-current-contactor-guidelines\/\">H\u01b0\u1edbng d\u1eabn l\u1ef1a ch\u1ecdn v\u00e0 \u0111\u1ea5u d\u00e2y contactor AC<\/a>, v\u00ec r\u01a1 le ch\u1ec9 b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 n\u1ebfu contactor t\u1ed3n t\u1ea1i \u0111\u1ee7 l\u00e2u \u0111\u1ec3 ng\u1eaft n\u00f3.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4658\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/11\/Thermal-or-Electronic-The-Honest-Comparison.webp\" alt=\"So s\u00e1nh trung th\u1ef1c gi\u1eefa R\u01a1 le qu\u00e1 t\u1ea3i nhi\u1ec7t v\u00e0 \u0111i\u1ec7n t\u1eed\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>L\u1edbp Ng\u1eaft: C\u00e0i \u0110\u1eb7t G\u00e2y Ra H\u1ea7u H\u1ebft C\u00e1c Ng\u1eaft Phi\u1ec1n Ph\u1ee9c<\/h2>\n<p>Theo ti\u00eau chu\u1ea9n IEC 60947-4-1, l\u1edbp ng\u1eaft \u0111\u1ec1 c\u1eadp \u0111\u1ebfn th\u1eddi gian c\u1ea7n \u0111\u1ec3 ng\u1eaft \u1edf 7,2 l\u1ea7n d\u00f2ng c\u00e0i \u0111\u1eb7t khi \u0111\u1ed9ng c\u01a1 c\u00f2n l\u1ea1nh. N\u00f3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 cho ph\u00e9p \u0111\u1ed9ng c\u01a1 tr\u1ea3i qua qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea3m nh\u1eadn d\u00f2ng \u0111i\u1ec7n cho \u0111\u1ebfn khi \u0111\u1ed9ng c\u01a1 d\u1eebng ho\u00e0n to\u00e0n.<\/p>\n<table>\n<thead>\n<tr>\n<th>L\u1edbp<\/th>\n<th>Th\u1eddi gian ng\u1eaft \u1edf 7,2 \u00d7 c\u00e0i \u0111\u1eb7t, t\u1eeb tr\u1ea1ng th\u00e1i l\u1ea1nh<\/th>\n<th>T\u1ea3i \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>10A<\/td>\n<td>2 \u0111\u1ebfn 10 gi\u00e2y<\/td>\n<td>Kh\u1edfi \u0111\u1ed9ng nhanh, qu\u00e1n t\u00ednh th\u1ea5p, l\u00e0m l\u1ea1nh k\u00edn<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>4 \u0111\u1ebfn 10 gi\u00e2y<\/td>\n<td>B\u01a1m, qu\u1ea1t, b\u0103ng t\u1ea3i nh\u1ecf, nhi\u1ec7m v\u1ee5 chung<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>6 \u0111\u1ebfn 20 gi\u00e2y<\/td>\n<td>B\u0103ng t\u1ea3i t\u1ea3i n\u1eb7ng, m\u00e1y n\u00e9n, qu\u1ea1t l\u1edbn h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>30<\/td>\n<td>9 \u0111\u1ebfn 30 gi\u00e2y<\/td>\n<td>M\u00e1y nghi\u1ec1n, m\u00e1y xay, m\u00e1y ly t\u00e2m, t\u1ea3i qu\u00e1n t\u00ednh cao<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Y\u00eau c\u1ea7u s\u1eed d\u1ee5ng d\u1ea3i dung sai E trong r\u01a1le \u0111i\u1ec7n t\u1eed l\u00e0 c\u00e1c t\u1ef7 l\u1ec7 t\u1ed1i thi\u1ec3u cho c\u00e1c l\u1edbp th\u1ea5p h\u01a1n so v\u1edbi c\u00e1c l\u1edbp kh\u00e1c, 3 gi\u00e2y cho 5E, 5 gi\u00e2y cho 10E, 10 gi\u00e2y cho 20E, v\u00e0 20 gi\u00e2y cho 30E v\u1edbi t\u1ef7 l\u1ec7 tr\u00ean b\u1eb1ng v\u1edbi t\u1ef7 l\u1ec7 cho c\u00e1c l\u1edbp kh\u00e1c.<\/p>\n<p>\u0110\u1ec3 quy\u1ebft \u0111\u1ecbnh l\u1edbp ng\u1eaft ph\u00f9 h\u1ee3p, c\u00e1c y\u00eau c\u1ea7u ban \u0111\u1ea7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01a1n gi\u1ea3n h\u00f3a: n\u00f3 n\u00ean d\u00e0i h\u01a1n th\u1eddi gian d\u1eabn \u0111\u1ea7u c\u1ee7a \u0111\u1ed9ng c\u01a1. Tuy nhi\u00ean, m\u1eb7c d\u00f9 quy t\u1eafc m\u00f4 t\u1ea3 \u0111\u01a1n gi\u1ea3n, v\u1eabn c\u00f3 nguy c\u01a1 m\u1eafc sai l\u1ea7m khi ch\u1ecdn r\u01a1le. Khi s\u1eed d\u1ee5ng r\u01a1le L\u1edbp 10 v\u1edbi \u0111\u1ed9ng c\u01a1 m\u1ea5t 14 gi\u00e2y \u0111\u1ec3 \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 l\u00e0m vi\u1ec7c, n\u00f3 s\u1ebd ng\u1eaft \u1edf m\u1ed7i l\u1ea7n th\u1eed, do \u0111\u00f3 s\u1ebd c\u00f3 xu h\u01b0\u1edbng \u0111i\u1ec1u ch\u1ec9nh d\u00f2ng c\u00e0i \u0111\u1eb7t thay v\u00ec thay \u0111\u1ed5i l\u1edbp c\u1ee7a r\u01a1le, \u0111i\u1ec1u n\u00e0y s\u1ebd kh\u1eafc ph\u1ee5c v\u1ea5n \u0111\u1ec1 nh\u01b0ng l\u00e0m m\u1ea5t \u0111i s\u1ef1 b\u1ea3o v\u1ec7 cho \u0111\u1ed9ng c\u01a1.<\/p>\n<p>M\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng m\u1eafc sai l\u1ea7m khi t\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 x\u1ea3y ra khi s\u1eed d\u1ee5ng b\u1ed9 kh\u1edfi \u0111\u1ed9ng sao - tam gi\u00e1c. D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua r\u01a1le qu\u00e1 t\u1ea3i \u0111\u01b0\u1ee3c l\u1eafp tr\u00ean ti\u1ebfp \u0111i\u1ec3m ch\u00ednh b\u1eb1ng 0,58 l\u1ea7n d\u00f2ng \u0111\u1ecbnh m\u1ee9c c\u1ee7a \u0111\u1ed9ng c\u01a1. N\u1ebfu c\u00f3 th\u00eam r\u01a1le qu\u00e1 t\u1ea3i b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 trong pha sao, n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t ho\u1ea1t \u0111\u1ed9ng \u1edf m\u1ed9t ph\u1ea7n ba gi\u00e1 tr\u1ecb d\u00f2ng \u0111i\u1ec7n.<\/p>\n<h2>Nguy\u00ean nh\u00e2n khi\u1ebfn r\u01a1le qu\u00e1 t\u1ea3i ng\u1eaft, v\u00e0 nh\u1eefng nguy\u00ean nh\u00e2n kh\u00f4ng ph\u1ea3i<\/h2>\n<p>Danh s\u00e1ch c\u00e1c nguy\u00ean nh\u00e2n th\u1ef1c t\u1ebf nh\u1ecf so v\u1edbi danh s\u00e1ch d\u00e0i c\u00e1c nguy\u00ean nh\u00e2n \u0111\u01b0\u1ee3c cho l\u00e0 li\u00ean quan \u0111\u1ebfn qu\u00e1 t\u1ea3i.<\/p>\n<p>Qu\u00e1 t\u1ea3i \u0111\u1ed9ng c\u01a1 x\u1ea3y ra khi d\u00f2ng \u0111i\u1ec7n hi\u1ec7u d\u1ee5ng v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c \u0111\u1ee7 l\u00e2u \u0111\u1ec3 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n nhi\u1ec7t. C\u00f3 b\u1ed1n nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y qu\u00e1 t\u1ea3i: v\u1ea5n \u0111\u1ec1 c\u01a1 h\u1ecdc, nh\u01b0 \u1ed5 bi b\u1ecb k\u1eb9t, ho\u1eb7c c\u00e1nh qu\u1ea1t b\u1ecb ch\u1eb7n ho\u1eb7c l\u1ec7ch; v\u1ea5n \u0111\u1ec1 cung c\u1ea5p, nh\u01b0 \u0111i\u1ec7n \u00e1p th\u1ea5p, l\u00e0m t\u0103ng d\u00f2ng \u0111i\u1ec7n; thay \u0111\u1ed5i s\u1eed d\u1ee5ng, nh\u01b0 chi ti\u1ebft gia c\u00f4ng n\u1eb7ng h\u01a1n, ho\u1eb7c b\u1ed9 gi\u1ea3m ch\u1ea5n b\u1ecb \u0111\u00f3ng; v\u00e0 kh\u1edfi \u0111\u1ed9ng th\u1ea5t b\u1ea1i, khi \u0111\u1ed9ng c\u01a1 kh\u00f4ng thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 v\u00e0 v\u1eabn \u1edf ch\u1ebf \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n kh\u00f3a.<\/p>\n<p>Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd m\u1ed9t s\u1ed1 sai l\u1ea7m m\u00e0 ng\u01b0\u1eddi d\u00f9ng m\u1eafc ph\u1ea3i trong vi\u1ec7c gi\u1ea3i th\u00edch qu\u00e1 t\u1ea3i. M\u1ed9t s\u1ed1 trong \u0111\u00f3 l\u00e0: ng\u1eafn m\u1ea1ch li\u00ean quan \u0111\u1ebfn b\u1ed9 ng\u1eaft; l\u1ed7i n\u1ed1i \u0111\u1ea5t, c\u1ea7n b\u1ea3o v\u1ec7 b\u1eb1ng RCD; ti\u1ebfp \u0111i\u1ec3m ch\u00ednh c\u1ee7a contactor b\u1ecb ch\u00e1y d\u1eabn \u0111\u1ebfn m\u1ea1ch h\u1edf; v\u00e0 l\u1ed7i trong m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n bi\u1ec3u hi\u1ec7n qua s\u1ef1 c\u1ed1 kh\u00f3a. Sai l\u1ea7m cu\u1ed1i c\u00f9ng l\u00e0 s\u1ef1 hi\u1ec3u nh\u1ea7m ph\u1ed5 bi\u1ebfn nh\u1ea5t v\u00ec n\u00f3 t\u1ea1o ra c\u00f9ng m\u1ed9t tri\u1ec7u ch\u1ee9ng: \u0111\u1ed9ng c\u01a1 d\u1eebng ho\u00e0n to\u00e0n, ph\u1ea3i kh\u1edfi \u0111\u1ed9ng l\u1ea1i. M\u1ed9t contactor m\u1ea5t pha do \u0103n m\u00f2n ti\u1ebfp \u0111i\u1ec3m s\u1ebd k\u00e9o d\u00f2ng \u0111i\u1ec7n l\u1edbn h\u01a1n tr\u00ean c\u00e1c pha c\u00f2n l\u1ea1i v\u00e0 tr\u00f4ng gi\u1ed1ng nh\u01b0 qu\u00e1 t\u1ea3i cho \u0111\u1ebfn khi ai \u0111\u00f3 ki\u1ec3m tra, v\u00e0 c\u00e1c tri\u1ec7u ch\u1ee9ng c\u1ee7a l\u1ed7i \u0111\u00f3 \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong ph\u1ea7n n\u00e0y. <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/ac-contactor-failure-symptoms\/\">Tri\u1ec7u ch\u1ee9ng h\u1ecfng b\u1ed9 ti\u1ebfp \u0111i\u1ec3m AC<\/a>.<\/p>\n<p>Vi\u1ec7c ng\u1eaft m\u1ea1ch l\u1eb7p l\u1ea1i tr\u00ean m\u1ed9t \u0111\u1ed9ng c\u01a1 \u0111\u00e3 s\u1eed d\u1ee5ng nhi\u1ec1u n\u0103m l\u00e0 v\u1ea5n \u0111\u1ec1 c\u01a1 kh\u00ed, kh\u00f4ng ph\u1ea3i t\u00edn hi\u1ec7u. Vi\u1ec7c ng\u1eaft m\u1ea1ch l\u1eb7p l\u1ea1i tr\u00ean m\u1ed9t l\u1eafp \u0111\u1eb7t m\u1edbi c\u00f3 kh\u1ea3 n\u0103ng cao l\u00e0 l\u1ed7i c\u00e0i \u0111\u1eb7t ho\u1eb7c l\u1ed7i l\u1edbp. B\u1ea5t k\u1ef3 ng\u1eaft m\u1ea1ch n\u00e0o ch\u1ec9 x\u1ea3y ra trong m\u00f9a h\u00e8 c\u00f3 kh\u1ea3 n\u0103ng li\u00ean quan \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9. B\u1ea5t k\u1ef3 ng\u1eaft m\u1ea1ch n\u00e0o khi kh\u1edfi \u0111\u1ed9ng c\u00f3 kh\u1ea3 n\u0103ng l\u00e0 l\u1ed7i l\u1edbp ho\u1eb7c l\u1ed7i c\u00e0i \u0111\u1eb7t sao-tam gi\u00e1c. C\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 ph\u00e2n lo\u1ea1i m\u1ed9t l\u1ea7n ng\u1eaft m\u1ea1ch l\u00e0 d\u1ef1a v\u00e0o th\u1eddi gian c\u1ee7a n\u00f3.<\/p>\n<h2>C\u00e0i \u0111\u1eb7t N\u00fam V\u1eb7n: D\u00f2ng \u0110\u1ecbnh M\u1ee9c, Kh\u00f4ng Ph\u1ea3i D\u00f2ng Ng\u1eaft M\u1ea1ch<\/h2>\n<p>N\u00fam v\u1eb7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n theo d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c t\u1ea3i \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111\u01b0\u1ee3c ghi tr\u00ean b\u1ea3ng t\u00ean v\u00e0 kh\u00f4ng ph\u1ea3i theo gi\u00e1 tr\u1ecb ng\u0103n ng\u1eeba ng\u1eaft m\u1ea1ch. Ti\u00eau chu\u1ea9n IEC 60947-4-1 quy \u0111\u1ecbnh r\u1eb1ng r\u01a1le kh\u00f4ng \u0111\u01b0\u1ee3c ng\u1eaft m\u1ea1ch trong \u0111i\u1ec1u ki\u1ec7n d\u00f2ng \u0111i\u1ec7n v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb n\u00e0y v\u1edbi h\u1ec7 s\u1ed1 1,05, v\u00e0 ph\u1ea3i ng\u1eaft m\u1ea1ch trong v\u00f2ng 2 gi\u1edd khi d\u00f2ng \u0111i\u1ec7n v\u01b0\u1ee3t qu\u00e1 v\u1edbi h\u1ec7 s\u1ed1 1,2. Gi\u00e1 tr\u1ecb tr\u00ean n\u00fam v\u1eb7n tr\u1edf th\u00e0nh \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u \u0111\u1ec3 v\u1ebd \u0111\u1eb7c t\u00ednh th\u1eddi gian ngh\u1ecbch \u0111\u1ea3o cho r\u01a1le.<\/p>\n<p>Ph\u1ea1m vi c\u00e0i \u0111\u1eb7t \u0111i\u1ec3n h\u00ecnh l\u00e0 1,5:1, v\u00ed d\u1ee5 7,5-11 Ampe, v\u00e0 n\u00ean \u0111\u1ea3m b\u1ea3o \u0111\u1ed9ng c\u01a1 ho\u1ea1t \u0111\u1ed9ng trong ph\u1ea1m vi quy \u0111\u1ecbnh thay v\u00ec \u1edf c\u00e1c gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i \u0111\u1ec3 cho ph\u00e9p \u0111i\u1ec1u ch\u1ec9nh nh\u1ecf sau \u0111\u00f3. Trong c\u00e1c t\u00ecnh hu\u1ed1ng khi h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 c\u1ee7a \u0111\u1ed9ng c\u01a1 v\u01b0\u1ee3t qu\u00e1 1,0, vi\u1ec7c c\u00e0i \u0111\u1eb7t cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi th\u00f4ng tin tr\u00ean b\u1ea3ng t\u00ean l\u00e0 h\u1ee3p l\u00fd. N\u1ebfu h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 b\u1eb1ng 1,0, th\u00ec n\u00ean c\u00e0i \u0111\u1eb7t theo d\u1eef li\u1ec7u tr\u00ean b\u1ea3ng t\u00ean ho\u1eb7c th\u1ea5p h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi con s\u1ed1 n\u00e0y.<\/p>\n<p>Khi vi\u1ec7c v\u1eadn h\u00e0nh ho\u00e0n t\u1ea5t, ba b\u01b0\u1edbc sau \u0111\u00e2y c\u1ea7n \u0111\u01b0\u1ee3c tu\u00e2n th\u1ee7. D\u00f2ng \u0111i\u1ec7n ch\u1ea1y c\u1ee7a b\u1ed9 thi\u1ebft l\u1eadp ho\u00e0n ch\u1ec9nh n\u00ean \u0111\u01b0\u1ee3c \u0111o v\u00e0 so s\u00e1nh v\u1edbi d\u00f2ng \u0111i\u1ec7n tr\u00ean b\u1ea3ng t\u00ean. C\u00e0i \u0111\u1eb7t ph\u1ea3i \u0111\u01b0\u1ee3c ghi l\u1ea1i tr\u00ean l\u1ecbch tr\u00ecnh b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n. B\u01b0\u1edbc cu\u1ed1i c\u00f9ng l\u00e0 ch\u1ecdn ch\u1ebf \u0111\u1ed9 thay \u0111\u1ed5i, th\u1ee7 c\u00f4ng ho\u1eb7c t\u1ef1 \u0111\u1ed9ng, t\u00f9y thu\u1ed9c v\u00e0o vi\u1ec7c c\u00f3 ng\u01b0\u1eddi quan s\u00e1t thi\u1ebft b\u1ecb hay kh\u00f4ng.<\/p>\n<h2>Khi M\u1ea5t Pha Thay \u0110\u1ed5i M\u1ecdi Th\u1ee9<\/h2>\n<p>M\u1ea5t pha \u0111\u01a1n c\u00f3 th\u1ec3 t\u1ea1o ra \u0111i\u1ec1u ki\u1ec7n qu\u00e1 t\u1ea3i nguy hi\u1ec3m nh\u1ea5t m\u00e0 m\u1ed9t \u0111\u1ed9ng c\u01a1 ba pha ph\u1ea3i \u0111\u1ed1i m\u1eb7t. Khi m\u1ed9t pha b\u1ecb h\u1ecfng v\u00e0 \u0111\u1ed9ng c\u01a1 ti\u1ebfp t\u1ee5c ch\u1ea1y tr\u00ean hai pha, d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua c\u00e1c cu\u1ed9n d\u00e2y c\u00f2n l\u1ea1i t\u0103ng m\u1ea1nh v\u00e0 ch\u1ecbu m\u1ed9t ph\u1ea7n t\u1ea3i d\u00f2ng \u0111i\u1ec7n c\u1ee7a r\u01a1le nhi\u1ec7t bimetal. M\u1ed9t r\u01a1le bimetal ba pha \u0111\u01a1n gi\u1ea3n c\u00f3 th\u1ec3 ch\u1eadm \u0111\u1ebfn m\u1ee9c cho ph\u00e9p s\u1ef1 h\u1ecfng cu\u1ed9n d\u00e2y \u0111\u1ea7u ti\u00ean x\u1ea3y ra.<\/p>\n<p>C\u1ea5u tr\u00fac nh\u1ea1y c\u1ea3m v\u1edbi m\u1ea5t pha, \u0111\u00f4i khi g\u1ecdi l\u00e0 kh\u00e1c bi\u1ec7t, s\u1ebd bao g\u1ed3m m\u1ed9t thanh t\u1ed5ng h\u1ee3p th\u1ee9 hai \u0111\u1ec3 c\u1ea3m nh\u1eadn s\u1ef1 kh\u00e1c bi\u1ec7t trong \u0111\u1ed9 l\u1ec7ch gi\u1eefa c\u00e1c pha. M\u1ed9t pha m\u1ea5t c\u00e2n b\u1eb1ng ho\u1eb7c b\u1ecb thi\u1ebfu s\u1ebd l\u00e0m r\u01a1le ng\u1eaft nhanh h\u01a1n so v\u1edbi qu\u00e1 t\u1ea3i \u0111\u1ed1i x\u1ee9ng c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9. C\u00e1c s\u1ed1 li\u1ec7u c\u00f4ng b\u1ed1 l\u00e0m r\u00f5 hi\u1ec7u \u1ee9ng n\u00e0y. Tr\u00ean m\u1ed9t d\u00f2ng r\u01a1le ph\u1ed5 bi\u1ebfn, d\u00f2ng ng\u1eaft t\u1ed1i \u0111a l\u00e0 120% c\u1ee7a t\u1ea3i \u0111\u1ea7y \u0111\u1ee7, v\u00e0 khi m\u1ea5t pha, l\u00e0 115%. R\u01a1le IEC hi\u1ec7n \u0111\u1ea1i m\u1eb7c \u0111\u1ecbnh nh\u1ea1y c\u1ea3m v\u1edbi m\u1ea5t pha; h\u00e0ng t\u1ed3n kho c\u0169 v\u00e0 h\u00e0ng nh\u1eadp kh\u1ea9u gi\u00e1 r\u1ebb th\u01b0\u1eddng kh\u00f4ng, v\u00e0 b\u1ea3ng d\u1eef li\u1ec7u kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng ghi r\u00f5 b\u1eb1ng ti\u1ebfng Anh \u0111\u01a1n gi\u1ea3n.<\/p>\n<h2>L\u1ef1a Ch\u1ecdn R\u01a1le Theo \u1ee8ng D\u1ee5ng<\/h2>\n<p>N\u0103m t\u00ecnh hu\u1ed1ng ph\u1ed5 bi\u1ebfn v\u00e0 nh\u1eefng g\u00ec c\u1ea7n ch\u1ec9 \u0111\u1ecbnh cho t\u1eebng tr\u01b0\u1eddng h\u1ee3p.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<th>Th\u00f4ng s\u1ed1 quan tr\u1ecdng<\/th>\n<th>Lo\u1ea1i \u0111\u1ec1 xu\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>B\u01a1m ho\u1eb7c qu\u1ea1t, tr\u1ef1c ti\u1ebfp tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/td>\n<td>L\u1edbp 10, nh\u1ea1y c\u1ea3m m\u1ea5t pha, \u0111\u1eb7t l\u1ea1i th\u1ee7 c\u00f4ng<\/td>\n<td>R\u01a1 le nhi\u1ec7t, g\u1eafn tr\u00ean contactor<\/td>\n<\/tr>\n<tr>\n<td>B\u0103ng t\u1ea3i ho\u1eb7c m\u00e1y n\u00e9n c\u00f3 t\u1ea3i<\/td>\n<td>L\u1edbp 20, b\u1ed9 nh\u1edb nhi\u1ec7t, \u0111\u1eb7t l\u1ea1i t\u1eeb xa<\/td>\n<td>R\u01a1 le \u0111i\u1ec7n t\u1eed v\u1edbi l\u1edbp c\u00f3 th\u1ec3 ch\u1ecdn<\/td>\n<\/tr>\n<tr>\n<td>M\u00e1y nghi\u1ec1n, m\u00e1y xay, m\u00e1y ly t\u00e2m<\/td>\n<td>L\u1edbp 30, ph\u00e1t hi\u1ec7n rotor k\u1eb9t, d\u00f2ng \u0111i\u1ec7n theo pha<\/td>\n<td>R\u01a1 le \u0111i\u1ec7n t\u1eed c\u00f3 truy\u1ec1n th\u00f4ng<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 kh\u1edfi \u0111\u1ed9ng sao - tam gi\u00e1c<\/td>\n<td>C\u00e0i \u0111\u1eb7t \u1edf 0,58 l\u1ea7n d\u00f2ng \u0111\u1ecbnh m\u1ee9c, r\u01a1 le th\u1ee9 hai \u1edf sao<\/td>\n<td>Nhi\u1ec7t, k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p v\u1edbi contactor ch\u00ednh<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9ng c\u01a1 \u0111\u01a1n, c\u00f4ng su\u1ea5t nh\u1ecf<\/td>\n<td>K\u1ebft h\u1ee3p t\u1eeb t\u00ednh v\u00e0 nhi\u1ec7t, m\u1ed9t thi\u1ebft b\u1ecb<\/td>\n<td>C\u1ea7u dao b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Trong tr\u01b0\u1eddng h\u1ee3p m\u1ed9t c\u01a1 s\u1edf t\u1ef1 s\u1ea3n xu\u1ea5t b\u1ed9 kh\u1edfi \u0111\u1ed9ng thay v\u00ec mua, r\u01a1 le l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a b\u1ed9 ba y\u1ebfu t\u1ed1 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh. S\u1ef1 ph\u1ed1i h\u1ee3p gi\u1eefa r\u01a1 le v\u00e0 contactor ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ec3 b\u1ed9 kh\u1edfi \u0111\u1ed9ng kh\u00f4ng b\u1ecb h\u01b0 h\u1ea1i do vi\u1ec7c x\u00f3a l\u1ed7i; \u0111\u00e2y ch\u00ednh l\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a ph\u1ed1i h\u1ee3p lo\u1ea1i 2, v\u00e0 m\u1ee9c \u0111\u1ed9 th\u00e0nh c\u00f4ng trong vi\u1ec7c \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y ho\u00e0n to\u00e0n ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb ph\u00eda tr\u00ean. <a href=\"https:\/\/huyuglobal.com\/vi\/product\/exb3-63-ac-mcb\/\">B\u1ed9 ng\u1eaft m\u1ea1ch khung 63 A lo\u1ea1i nh\u1ecf<\/a> l\u00e0 l\u1ef1a ch\u1ecdn th\u00f4ng th\u01b0\u1eddng ph\u00eda tr\u00ean cho c\u00e1c b\u1ed9 kh\u1edfi \u0111\u1ed9ng nh\u1ecf, v\u00e0 \u0111\u01b0\u1eddng cong c\u1ee7a n\u00f3 ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi d\u00f2ng kh\u1edfi \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 ho\u1eb7c l\u1ea7n kh\u1edfi \u0111\u1ed9ng \u0111\u1ea7u ti\u00ean s\u1ebd l\u00e0m ng\u1eaft b\u1ed9 ng\u1eaft thay v\u00ec r\u01a1 le.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>Ch\u1ee9c n\u0103ng c\u1ee7a r\u01a1 le qu\u00e1 t\u1ea3i trong m\u1ea1ch \u0111\u1ed9ng c\u01a1 l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u1ec3 b\u1ea3o v\u1ec7 cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 kh\u1ecfi d\u00f2ng qu\u00e1 t\u1ea3i k\u00e9o d\u00e0i, ph\u01b0\u01a1ng ph\u00e1p bao g\u1ed3m m\u1edf m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n khi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n \u0111\u1ee7 \u0111\u1ec3 v\u01b0\u1ee3t qu\u00e1 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ee7a \u0111\u1ed9ng c\u01a1. N\u00f3 kh\u00f4ng lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c ng\u1eafn m\u1ea1ch v\u00e0 kh\u00f4ng th\u1ec3 thay th\u1ebf b\u1ed9 ng\u1eaft ho\u1eb7c c\u1ea7u ch\u00ec ph\u00eda tr\u01b0\u1edbc m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n.<\/p>\n<h3>M\u1ee5c \u0111\u00edch c\u1ee7a r\u01a1 le qu\u00e1 t\u1ea3i nhi\u1ec7t trong b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 l\u00e0 g\u00ec?<\/h3>\n<p>C\u01a1 ch\u1ebf b\u1ea3o v\u1ec7 n\u00e0y ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng d\u1ea3i bimetal \u0111\u01b0\u1ee3c l\u00e0m n\u00f3ng b\u1edfi d\u00f2ng \u0111i\u1ec7n \u0111\u1ed9ng c\u01a1. \u01afu \u0111i\u1ec3m c\u1ee7a n\u00f3 trong c\u00f4ng t\u1eafc kh\u1edfi \u0111\u1ed9ng l\u00e0 kh\u00f4ng c\u1ea7n ngu\u1ed3n \u0111i\u1ec7n b\u1ed5 sung v\u00e0 c\u00f3 \u0111\u1eb7c t\u00ednh nhi\u1ec7t \u0111\u1ed9 v\u00e0 d\u00f2ng \u0111i\u1ec7n gi\u1ed1ng nh\u01b0 \u0111\u1ed9ng c\u01a1. Do \u0111\u00f3, lo\u1ea1i b\u1ea3o v\u1ec7 n\u00e0y v\u1eabn l\u00e0 ti\u00eau chu\u1ea9n cho c\u00e1c b\u1ed9 kh\u1edfi \u0111\u1ed9ng tr\u1ef1c ti\u1ebfp \u0111\u01a1n gi\u1ea3n.<\/p>\n<h3>R\u01a1 le qu\u00e1 t\u1ea3i \u0111\u1ed9ng c\u01a1 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n<p>Nhi\u1ec7t sinh ra b\u1edfi d\u00f2ng \u0111i\u1ec7n trong bimetal ho\u1eb7c bi\u1ebfn d\u00f2ng \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi m\u00f4 h\u00ecnh nhi\u1ec7t. Tuy nhi\u00ean, n\u1ebfu t\u00edn hi\u1ec7u thu \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n theo l\u1edbp ng\u1eaft, m\u1ed9t ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng \u0111\u00f3ng s\u1ebd m\u1edf ra v\u00e0 contactor s\u1ebd ng\u1eaft. Contactor s\u1ebd gi\u1eef tr\u1ea1ng th\u00e1i kh\u00f3a cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ea1i.<\/p>\n<h3>C\u00e1c lo\u1ea1i r\u01a1 le qu\u00e1 t\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 l\u00e0 g\u00ec?<\/h3>\n<p>C\u00f3 b\u1ed1n lo\u1ea1i r\u01a1 le th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u1ef1c t\u1ebf. \u0110\u00f3 l\u00e0 r\u01a1 le bimetal nhi\u1ec7t, r\u01a1 le qu\u00e1 t\u1ea3i \u0111i\u1ec7n t\u1eed, b\u1ed9 ng\u1eaft m\u1ea1ch b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 k\u1ebft h\u1ee3p t\u00ednh n\u0103ng c\u1ee7a c\u1ea3 r\u01a1 le nhi\u1ec7t v\u00e0 t\u1eeb t\u00ednh, v\u00e0 kh\u1ed1i qu\u00e1 t\u1ea3i b\u00e1n d\u1eabn s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec7n t\u1eed \u0111\u1ec3 \u0111o qu\u00e1 t\u1ea3i nh\u01b0ng c\u00f3 k\u00edch th\u01b0\u1edbc gi\u1ed1ng r\u01a1 le nhi\u1ec7t.<\/p>\n<h3>Nguy\u00ean nh\u00e2n n\u00e0o khi\u1ebfn r\u01a1 le qu\u00e1 t\u1ea3i nh\u1ea3y?<\/h3>\n<p>S\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a qu\u00e1 t\u1ea3i c\u01a1 h\u1ecdc, ngu\u1ed3n \u0111i\u1ec7n \u00e1p th\u1ea5p, thay \u0111\u1ed5i t\u1ea3i v\u1eadn h\u00e0nh, ho\u1eb7c m\u1ed9t \u0111\u1ed9ng c\u01a1 ho\u00e0n to\u00e0n kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9. Trong m\u1ed9t l\u1eafp \u0111\u1eb7t c\u0169, m\u1ed9t v\u1ea5n \u0111\u1ec1 c\u01a1 h\u1ecdc ti\u1ec1m \u1ea9n s\u1ebd cho th\u1ea5y d\u1ea5u hi\u1ec7u c\u1ee7a nhi\u1ec1u l\u1ea7n ng\u1eaft m\u1ea1ch; tuy nhi\u00ean, m\u1ed9t l\u1eafp \u0111\u1eb7t m\u1edbi c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u01a1n gi\u1ea3n cho th\u1ea5y c\u1ea7n m\u1ed9t l\u1edbp ng\u1eaft kh\u00e1c ho\u1eb7c c\u00e0i \u0111\u1eb7t ng\u1eaft sai.<\/p>\n<h3>R\u01a1 le qu\u00e1 t\u1ea3i c\u00f3 b\u1ea3o v\u1ec7 ch\u1ed1ng ng\u1eafn m\u1ea1ch kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng, n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ch\u1eadm \u0111\u1ec3 c\u00f3 th\u1ec3 v\u01b0\u1ee3t qua qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1. Do \u0111\u00f3, n\u00f3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng cho d\u00f2ng s\u1ef1 c\u1ed1. V\u00ec v\u1eady, c\u1ea7n ph\u1ea3i cung c\u1ea5p b\u1ea3o v\u1ec7 ri\u00eang bi\u1ec7t ch\u1ed1ng l\u1ea1i s\u1ef1 c\u1ed1 ng\u1eafn m\u1ea1ch. Hai thi\u1ebft b\u1ecb n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c ch\u1ecdn c\u00f9ng nhau, \u0111\u1ec3 b\u1ed9 kh\u1edfi \u0111\u1ed9ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i s\u1ef1 c\u1ed1 m\u00e0 kh\u00f4ng b\u1ecb h\u01b0 h\u1ecfng.<\/p>\n<h3>T\u00f4i c\u00f3 th\u1ec3 \u0111\u1eb7t r\u01a1 le qu\u00e1 t\u1ea3i cao h\u01a1n d\u00f2ng \u0111\u1ecbnh m\u1ee9c c\u1ee7a \u0111\u1ed9ng c\u01a1 kh\u00f4ng?<\/h3>\n<p>H\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t cao h\u01a1n n\u1ebfu c\u00f3 l\u00fd do h\u1ee3p l\u1ec7. \u0110\u1eb7t h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 cao h\u01a1n \u0111\u1ec3 tr\u00e1nh ng\u1eaft m\u1ea1ch kh\u00f4ng c\u1ea7n thi\u1ebft s\u1ebd l\u00e0m m\u1ea5t m\u1ee5c \u0111\u00edch c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng \u0111\u1ed9ng c\u01a1 ngay t\u1eeb \u0111\u1ea7u, v\u00e0 thay v\u00ec ng\u1eaft m\u1ea1ch, s\u1ef1 c\u1ed1 ti\u1ebfp theo s\u1ebd l\u00e0 cu\u1ed9n d\u00e2y.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.siemens.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Siemens \u2014 T\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt R\u01a1 le qu\u00e1 t\u1ea3i SIRIUS<\/a><\/li>\n<li><a href=\"https:\/\/www.abb.com\/\" rel=\"nofollow noopener\" target=\"_blank\">ABB \u2014 R\u01a1 le qu\u00e1 t\u1ea3i nhi\u1ec7t v\u00e0 \u0111i\u1ec7n t\u1eed<\/a><\/li>\n<li><a href=\"https:\/\/www.newark.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Newark \u2014 R\u01a1 le qu\u00e1 t\u1ea3i v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1<\/a><\/li>\n<li><a href=\"https:\/\/www.grainger.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Grainger \u2014 B\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 v\u00e0 r\u01a1 le qu\u00e1 t\u1ea3i<\/a><\/li>\n<li><a href=\"https:\/\/www.nema.org\/\" rel=\"nofollow noopener\" target=\"_blank\">NEMA \u2014 Ti\u00eau chu\u1ea9n thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1<\/a><\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>R\u01a1 le qu\u00e1 t\u1ea3i ho\u1ea1t \u0111\u1ed9ng ch\u1eadm, b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. B\u1ea3n ch\u1ea5t nhi\u1ec7m v\u1ee5 c\u1ee7a n\u00f3 l\u00e0 ph\u00e1t hi\u1ec7n d\u00f2ng qu\u00e1 t\u1ea3i nh\u1eb9 k\u00e9o d\u00e0i, \u0111i\u1ec1u n\u00e0y ng\u1ee5 \u00fd vi\u1ec7c \u0111\u1eb7t n\u00fam \u0111i\u1ec1u ch\u1ec9nh \u1edf d\u00f2ng \u0111\u1ecbnh m\u1ee9c c\u1ee7a \u0111\u1ed9ng c\u01a1, l\u1edbp ng\u1eaft ch\u1ec9 cao h\u01a1n th\u1eddi gian kh\u1edfi \u0111\u1ed9ng, v\u00e0 hi\u1ec3u r\u1eb1ng ng\u1eaft m\u1ea1ch ch\u1ec9 l\u00e0 th\u00f4ng tin.<\/p>\n<p>Nh\u1eefng l\u1ed7i duy nh\u1ea5t c\u1ea7n ch\u00fa \u00fd l\u00e0 r\u01a1 le \u0111\u01b0\u1ee3c \u0111\u1eb7t qu\u00e1 cao v\u00e0 ti\u1ebfp \u0111i\u1ec3m 95-96 c\u1ee7a r\u01a1 le kh\u00f4ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ea1ch cu\u1ed9n d\u00e2y. Trong c\u1ea3 hai tr\u01b0\u1eddng h\u1ee3p, \u0111\u1ed9ng c\u01a1 v\u1eabn kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 ngay c\u1ea3 khi b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u00f3 v\u1ebb \u0111\u01b0\u1ee3c l\u1eafp r\u00e1p \u0111\u1ea7y \u0111\u1ee7, v\u00e0 ki\u1ec3m tra c\u1ea3 hai tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng m\u1ea5t qu\u00e1 m\u1ed9t ph\u00fat.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>In most cases, electric motors do not get damaged due to short circuits. Usually, they stop functioning due to getting overheated because of continued operation at 110% of the rated current for 40 minutes due to dry bearings or restricted flow through pumps or other similar faults that have gone undetected by everyone until the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4656,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4655","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/comments?post=4655"}],"version-history":[{"count":2,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4655\/revisions"}],"predecessor-version":[{"id":4660,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4655\/revisions\/4660"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/4656"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=4655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=4655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=4655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}