{"id":4237,"date":"2026-09-13T00:52:32","date_gmt":"2026-09-13T00:52:32","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=4237"},"modified":"2026-09-13T00:54:00","modified_gmt":"2026-09-13T00:54:00","slug":"what-is-the-function-of-a-no-volt-release","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/what-is-the-function-of-a-no-volt-release\/","title":{"rendered":"Ch\u1ee9c n\u0103ng c\u1ee7a No-Volt Release l\u00e0 g\u00ec?"},"content":{"rendered":"<p>M\u1ed9t thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p cung c\u1ea5p c\u00e2u tr\u1ea3 l\u1eddi cho m\u1ed9t c\u00e2u h\u1ecfi m\u00e0 m\u1ecdi nh\u00e0 s\u1ea3n xu\u1ea5t t\u1ee7 \u0111i\u1ec1u khi\u1ec3n v\u00e0 nh\u00e0 thi\u1ebft k\u1ebf m\u00e1y m\u00f3c \u0111\u1ec1u ph\u1ea3i t\u1ef1 h\u1ecfi t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m n\u00e0o \u0111\u00f3: \u201c\u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu ngu\u1ed3n \u0111i\u1ec7n b\u1ecb m\u1ea5t v\u00e0 sau \u0111\u00f3 \u0111\u01b0\u1ee3c c\u1ea5p l\u1ea1i?\u201d N\u00f3i r\u1eb1ng \u201cm\u00e1y t\u1ef1 kh\u1edfi \u0111\u1ed9ng l\u1ea1i\u201d l\u00e0 kh\u00f4ng ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi c\u00e1c m\u00e1y c\u00f3 dao quay, b\u0103ng t\u1ea3i t\u1ea3i v\u00e0 b\u01a1m \u00e1p su\u1ea5t. Thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p (\u0111\u00f4i khi g\u1ecdi l\u00e0 cu\u1ed9n d\u00e2y kh\u00f4ng \u0111i\u1ec7n \u00e1p ho\u1eb7c thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n \u00e1p th\u1ea5p (UVR)) duy tr\u00ec v\u1ecb tr\u00ed \u201cT\u00f4i s\u1ebd gi\u1eef T\u1eaeT cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c l\u1ec7nh b\u1eadt.\u201d Thi\u1ebft b\u1ecb n\u00e0y c\u0169ng l\u00e0 thi\u1ebft b\u1ecb an to\u00e0n c\u00f3 chi ph\u00ed th\u1ea5p nh\u1ea5t trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n v\u00e0 c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng thi\u1ebft b\u1ecb b\u1ecb hi\u1ec3u nh\u1ea7m nhi\u1ec1u nh\u1ea5t v\u00ec ch\u1ee9c n\u0103ng t\u01b0\u01a1ng t\u1ef1 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n r\u1ea5t kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o vi\u1ec7c s\u1eed d\u1ee5ng contactor hay b\u1ed9 ng\u1eaft m\u1ea1ch. H\u01b0\u1edbng d\u1eabn n\u00e0y ch\u1ee9a th\u00f4ng tin v\u1ec1 thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p, c\u00e1ch ho\u1ea1t \u0111\u1ed9ng, \u1ee9ng d\u1ee5ng, s\u1ef1 kh\u00e1c bi\u1ec7t v\u1edbi shunt trips, c\u00e1c l\u1ef1a ch\u1ecdn thay th\u1ebf, nhu c\u1ea7u s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p, v\u00e0 c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u0169ng nh\u01b0 ki\u1ec3m tra thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p \u0111\u1ec3 b\u1ea1n kh\u00f4ng r\u01a1i v\u00e0o b\u1eaby \u0111i\u1ec7n \u00e1p cu\u1ed9n d\u00e2y.<\/p>\n<blockquote><p>T\u00f3m l\u1ea1i, m\u1ee5c \u0111\u00edch c\u1ee7a thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p l\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng thi\u1ebft b\u1ecb chuy\u1ec3n m\u1ea1ch gi\u1eef \u1edf v\u1ecb tr\u00ed \u0111\u00f3ng mi\u1ec5n l\u00e0 \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c cung c\u1ea5p; n\u1ebfu \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n b\u1ecb ng\u1eaft, thi\u1ebft b\u1ecb s\u1ebd t\u1ef1 \u0111\u1ed9ng m\u1edf theo ti\u00eau chu\u1ea9n IEC\/EN 60947-2, khi m\u1ea5t \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n xu\u1ed1ng d\u01b0\u1edbi 35% gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c; ng\u01b0\u1ee3c l\u1ea1i, trong kho\u1ea3ng t\u1eeb 35% \u0111\u1ebfn 70% \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c, kh\u00f4ng c\u00f3 m\u1ee9c n\u00e0o cho ph\u00e9p thi\u1ebft b\u1ecb t\u1ef1 \u0111\u1ed9ng m\u1edf, v\u00e0 tr\u00ean 70% s\u1ebd kh\u00f4ng c\u00f3 vi\u1ec7c m\u1edf t\u1ef1 \u0111\u1ed9ng. Thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p ng\u0103n ch\u1eb7n vi\u1ec7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i t\u1ef1 \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb sau khi m\u1ea5t ngu\u1ed3n v\u00ec khi ngu\u1ed3n \u0111i\u1ec7n \u0111\u01b0\u1ee3c kh\u00f4i ph\u1ee5c sau m\u1ea5t \u0111i\u1ec7n, vi\u1ec7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i ch\u1ec9 c\u00f3 th\u1ec3 x\u1ea3y ra khi \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c ph\u1ee5c h\u1ed3i \u0111\u1ebfn kho\u1ea3ng 85% gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c.<\/p><\/blockquote>\n<h2>Ch\u1ee9c N\u0103ng C\u1ed1t L\u00f5i<\/h2>\n<p>Phi\u00ean b\u1ea3n m\u1ed9t c\u00e2u c\u1ee7a \u0111i\u1ec1u n\u00e0y l\u00e0 thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p l\u00e0m cho vi\u1ec7c cung c\u1ea5p \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n tr\u1edf th\u00e0nh \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n v\u1eabn b\u1eadt. Tuy nhi\u00ean, c\u00f3 b\u1ed1n ch\u1ee9c n\u0103ng kh\u00e1c nhau v\u00e0 n\u00ean l\u00e0m r\u00f5 ch\u00fang v\u00ec c\u00e1c d\u1ef1 \u00e1n kh\u00e1c nhau s\u1ebd y\u00eau c\u1ea7u c\u00e1c ch\u1ee9c n\u0103ng kh\u00e1c nhau.<\/p>\n<p><span style=\"color: #ff0000;\">Ng\u0103n Ch\u1eb7n Kh\u1edfi \u0110\u1ed9ng L\u1ea1i B\u1ea5t Ng\u1edd.<\/span> \u0110\u00e2y l\u00e0 m\u1ee5c \u0111\u00edch ch\u00ednh c\u1ee7a thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p v\u00e0 c\u0169ng l\u00e0 ngu\u1ed3n g\u1ed1c t\u00ean g\u1ecdi c\u1ee7a n\u00f3. Khi c\u00f3 s\u1ef1 c\u1ed1 m\u1ea5t ngu\u1ed3n, m\u1ecdi th\u1ee9 sau \u0111i\u1ec3m n\u00e0y s\u1ebd d\u1eebng l\u1ea1i. Tuy nhi\u00ean, nguy hi\u1ec3m \u0111\u1ebfn t\u1eeb nh\u1eefng gi\u00e2y sau khi ngu\u1ed3n \u0111\u01b0\u1ee3c kh\u00f4i ph\u1ee5c. Tai n\u1ea1n kinh \u0111i\u1ec3n m\u00e0 thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p nh\u1eb1m ng\u0103n ch\u1eb7n l\u00e0 khi m\u1ed9t c\u01b0a, m\u00e1y tr\u1ed9n, b\u0103ng t\u1ea3i ho\u1eb7c m\u00e1y c\u00f4ng c\u1ee5 ho\u1ea1t \u0111\u1ed9ng tr\u1edf l\u1ea1i trong khi tay ng\u01b0\u1eddi v\u1eadn h\u00e0nh v\u1eabn c\u00f2n trong m\u00e1y. Thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p s\u1ebd ng\u0103n m\u1ea1ch \u0111\u00f3ng l\u1ea1i cho \u0111\u1ebfn khi ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n thao t\u00e1c nh\u1ea5n n\u00fat kh\u1edfi \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng trong c\u00e1c ti\u00eau chu\u1ea9n m\u00e1y m\u00f3c v\u00e0 l\u00e0 y\u00eau c\u1ea7u c\u1ea7n thi\u1ebft cho ph\u1ea7n l\u1edbn c\u00e1c m\u00e1y c\u00f4ng nghi\u1ec7p.<\/p>\n<p><span style=\"color: #ff0000;\">T\u1ea1o M\u1ed9t Ch\u1ebf \u0110\u1ed9 T\u1eaft M\u00e1y T\u1ef1 \u0110\u1ed9ng Khi \u0110i\u1ec7n \u00c1p Duy Tr\u00ec Th\u1ea5p.<\/span> \u0110\u1ed9ng c\u01a1 s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1t khi \u0111i\u1ec7n \u00e1p th\u1ea5p h\u01a1n. C\u00e1c \u0111\u1ed9ng c\u01a1 ri\u00eang l\u1ebb s\u1ebd ti\u00eau th\u1ee5 nhi\u1ec1u \u0111i\u1ec7n h\u01a1n \u1edf \u0111i\u1ec7n \u00e1p th\u1ea5p h\u01a1n \u0111\u1ec3 t\u1ea1o ra c\u00f9ng m\u1ed9t l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c v\u00e0 g\u00e2y ra nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n trong d\u00e2y d\u1eabn, n\u01a1i c\u00f3 th\u1ec3 x\u1ea3y ra s\u1ef1 c\u1ed1 c\u00e1ch \u0111i\u1ec7n v\u00e0 h\u1ecfng h\u00f3c thi\u1ebft b\u1ecb. Vai tr\u00f2 c\u1ee7a r\u01a1le \u0111i\u1ec7n \u00e1p th\u1ea5p (UVR) l\u00e0 m\u1edf m\u1ea1ch \u0111\u1ec3 tr\u00e1nh s\u1ef1 c\u1ed1 nhi\u1ec7t.<\/p>\n<p><span style=\"color: #ff0000;\">T\u1ea1o m\u1ed9t \u0111\u01b0\u1eddng an to\u00e0n c\u1ee9ng n\u1ed1i d\u00e2y.<\/span> V\u00ec b\u1ed9 ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p ho\u1ea1t \u0111\u1ed9ng li\u00ean quan \u0111\u1ebfn vi\u1ec7c thi\u1ebfu \u0111i\u1ec7n \u00e1p khi c\u00f3 \u0111i\u1ec7n \u00e1p cung c\u1ea5p b\u00ecnh th\u01b0\u1eddng, m\u1ecdi thi\u1ebft b\u1ecb an to\u00e0n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n \u0111\u1ec3 t\u1ea1o ra vi\u1ec7c t\u1eaft m\u00e1y kh\u1ea9n c\u1ea5p. C\u00f4ng t\u1eafc an to\u00e0n, c\u00f4ng t\u1eafc d\u00e2y k\u00e9o, c\u00f4ng t\u1eafc b\u00e1o ch\u00e1y ho\u1eb7c ti\u1ebfp x\u00fac v\u1edbi h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u00f2a nh\u00e0 t\u1ef1 nhi\u00ean t\u1ea1o ra vi\u1ec7c m\u1edf m\u1ea1ch. B\u1ea5t c\u1ee9 th\u1ee9 g\u00ec l\u00e0m \u0111\u1ee9t \u0111\u01b0\u1eddng d\u00e2y \u0111\u1ec1u t\u1ea1o ra vi\u1ec7c t\u1eaft m\u00e1y an to\u00e0n. H\u00e0nh vi n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cfail-safe\u201d (an to\u00e0n khi h\u1ecfng).\u201d<\/p>\n<p><span style=\"color: #ff0000;\">X\u00e1c nh\u1eadn \u0111i\u1ec7n \u00e1p kh\u1ecfe m\u1ea1nh tr\u01b0\u1edbc khi \u0111\u00f3ng.<\/span> Trong tr\u01b0\u1eddng h\u1ee3p s\u01a1 \u0111\u1ed3 chuy\u1ec3n \u0111\u1ed5i m\u00e1y ph\u00e1t \u0111i\u1ec7n, s\u1ebd c\u00f3 s\u1ef1 lo l\u1eafng khi \u0111\u00f3ng c\u00f4ng t\u1eafc n\u1ebfu kh\u00f4ng c\u00f3 \u0111i\u1ec7n \u00e1p. UVR s\u1ebd cho ph\u00e9p x\u00e1c nh\u1eadn r\u1eb1ng c\u00f3 \u0111i\u1ec7n \u00e1p kh\u1ecfe m\u1ea1nh (l\u1edbn h\u01a1n 85% \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c).<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4238\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/How-No-Volt-Release-Works.webp\" alt=\"How No-Volt Release Works\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>Trong c\u1ea5u h\u00ecnh contactor, nguy\u00ean l\u00fd r\u1ea5t \u0111\u01a1n gi\u1ea3n. N\u0103ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c cung c\u1ea5p cho cu\u1ed9n contactor b\u1eb1ng c\u00e1ch nh\u1ea5n c\u00f4ng t\u1eafc kh\u1edfi \u0111\u1ed9ng, v\u00e0 khi c\u00e1c ti\u1ebfp \u0111i\u1ec3m ch\u00ednh \u0111\u00f3ng, m\u1ed9t ti\u1ebfp \u0111i\u1ec3m ph\u1ee5, th\u01b0\u1eddng m\u1edf song song v\u1edbi c\u00f4ng t\u1eafc kh\u1edfi \u0111\u1ed9ng c\u0169ng s\u1ebd \u0111\u00f3ng l\u1ea1i. Ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 n\u00e0y, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ti\u1ebfp \u0111i\u1ec3m gi\u1eef, ti\u1ebfp t\u1ee5c cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho cu\u1ed9n sau khi ng\u01b0\u1eddi v\u1eadn h\u00e0nh nh\u1ea3 n\u00fat. Do \u0111\u00f3, ngay c\u1ea3 khi nh\u1ea3 n\u00fat, cu\u1ed9n v\u1eabn c\u00f3 \u0111\u01b0\u1eddng d\u1eabn cho d\u00f2ng \u0111i\u1ec7n, do \u0111\u00f3 m\u1ea1ch \u0111\u01b0\u1ee3c duy tr\u00ec t\u1ef1 \u0111\u1ed9ng v\u00ec kh\u00f4ng c\u1ea7n ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng b\u00ean ngo\u00e0i \u0111\u1ec3 gi\u1eef tr\u1ea1ng th\u00e1i \u0111\u00f3. V\u00ec \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n k\u00edch ho\u1ea1t thi\u1ebft b\u1ecb, ta c\u00f3 th\u1ec3 n\u00f3i cu\u1ed9n \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ed9 ng\u1eaft \u0111i\u1ec7n kh\u00f4ng \u0111i\u1ec7n \u00e1p. Kh\u00f4ng c\u1ea7n th\u00e0nh ph\u1ea7n b\u1ed5 sung n\u00e0o trong m\u1ea1ch.<\/p>\n<p>Tuy nhi\u00ean, v\u1edbi c\u1ea7u dao, ch\u00fang ta g\u1eb7p t\u00ecnh hu\u1ed1ng kh\u00e1c v\u00e0 do \u0111\u00f3 ph\u00e1t sinh h\u1ea7u h\u1ebft s\u1ef1 nh\u1ea7m l\u1eabn. C\u1ea7u dao d\u1ef1a v\u00e0o ch\u1ed1t c\u01a1 h\u1ecdc, ngh\u0129a l\u00e0 n\u00f3 gi\u1eef \u1edf v\u1ecb tr\u00ed \u0111\u00f3ng v\u00f4 th\u1eddi h\u1ea1n m\u00e0 kh\u00f4ng c\u1ea7n c\u1ea5p \u0111i\u1ec7n cho m\u1ea1ch. Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t c\u01a1 ch\u1ebf an to\u00e0n, g\u1ecdi l\u00e0 thi\u1ebft b\u1ecb ng\u1eaft \u0111i\u1ec7n \u00e1p th\u1ea5p trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, ph\u1ea3i \u0111\u01b0\u1ee3c th\u00eam v\u00e0o nh\u01b0 m\u1ed9t solenoid v\u1edbi ch\u1ed1t gi\u1eef c\u01a1 ch\u1ebf \u0111\u00f3ng ch\u1ec9 khi cu\u1ed9n c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n. C\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb n\u00e0y theo IEC\/EN 60947-2 l\u00e0 gi\u1ed1ng nhau v\u1edbi t\u1ea5t c\u1ea3 c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t l\u1edbn:<\/p>\n<table>\n<tbody>\n<tr>\n<th>\u0110i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n (nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a \u0111i\u1ec7n \u00e1p cu\u1ed9n \u0111\u1ecbnh m\u1ee9c)<\/th>\n<th>H\u00e0nh vi thi\u1ebft b\u1ecb<\/th>\n<\/tr>\n<tr>\n<td>D\u01b0\u1edbi 0,35 \u00d7 U<sub>n<\/sub><\/td>\n<td>Ng\u1eaft ch\u1eafc ch\u1eafn \u2014 solenoid gi\u1ea3i ph\u00f3ng v\u00e0 thi\u1ebft b\u1ecb m\u1edf ra<\/td>\n<\/tr>\n<tr>\n<td>T\u1eeb 0,35 \u0111\u1ebfn 0,70 \u00d7 U<sub>n<\/sub><\/td>\n<td>Kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u2014 c\u00f3 th\u1ec3 ng\u1eaft, c\u00f3 th\u1ec3 kh\u00f4ng; d\u1ea3i n\u00e0y c\u1ed1 \u00fd kh\u00f4ng ph\u1ea3i l\u00e0 \u0111i\u1ec3m th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/td>\n<\/tr>\n<tr>\n<td>Tr\u00ean 0,70 \u00d7 U<sub>n<\/sub><\/td>\n<td>Kh\u00f4ng ng\u1eaft do ch\u1ee9c n\u0103ng \u0111i\u1ec7n \u00e1p th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ee5c h\u1ed3i \u0111\u1ebfn kho\u1ea3ng 0,85 \u00d7 U<sub>n<\/sub><\/td>\n<td>\u0110\u01b0\u1ee3c ph\u00e9p \u0111\u00f3ng l\u1ea1i \u2014 nh\u01b0ng ch\u1ec9 b\u1eb1ng thao t\u00e1c c\u00f3 ch\u1ee7 \u00fd, kh\u00f4ng bao gi\u1edd t\u1ef1 \u0111\u1ed9ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T\u1eeb b\u1ea3ng \u0111\u00f3, c\u00f3 th\u1ec3 r\u00fat ra hai \u0111i\u1ec3m th\u1ef1c ti\u1ec5n r\u1ea5t quan tr\u1ecdng. \u0110i\u1ec3m \u0111\u1ea7u ti\u00ean l\u00e0 d\u1ea3i 35-70% kh\u00f4ng x\u00e1c \u0111\u1ecbnh c\u00f3 ngh\u0129a l\u00e0 UVR kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c tin c\u1eady \u0111\u1ec3 ng\u1eaft \u1edf b\u1ea5t k\u1ef3 m\u1ee9c \u0111i\u1ec7n \u00e1p n\u00e0o; n\u00f3 ch\u1ec9 l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb an to\u00e0n d\u1ef1 ph\u00f2ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t b\u1ed9 gi\u00e1m s\u00e1t ch\u00ednh x\u00e1c. \u0110i\u1ec3m th\u1ee9 hai l\u00e0 trong tr\u01b0\u1eddng h\u1ee3p c\u00e1c l\u1eafp \u0111\u1eb7t c\u00f3 khi\u1ebfu n\u1ea1i ng\u1eafn v\u1ec1 s\u1ee5t \u00e1p, c\u00f3 s\u1eb5n m\u1ed9t b\u1ed9 tr\u1ec5 th\u1eddi gian; b\u1ed9 n\u00e0y s\u1ebd cho ph\u00e9p tr\u00ec ho\u00e3n vi\u1ec7c ng\u1eaft trong tr\u01b0\u1eddng h\u1ee3p s\u1ee5t \u00e1p d\u01b0\u1edbi kho\u1ea3ng 200 mili gi\u00e2y, cho ph\u00e9p m\u1ed9t s\u1ee5t \u00e1p ng\u1eafn kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh kh\u00f4ng l\u00e0m d\u1eebng nh\u00e0 m\u00e1y. Vi\u1ec7c l\u1ef1a ch\u1ecdn UVR c\u00f3 tr\u1ec5 th\u1eddi gian trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1ee5t \u00e1p th\u01b0\u1eddng xuy\u00ean l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa vi\u1ec7c cung c\u1ea5p b\u1ea3o v\u1ec7 h\u1eefu \u00edch v\u00e0 cung c\u1ea5p m\u1ed9t thi\u1ebft b\u1ecb m\u00e0 ng\u01b0\u1eddi v\u1eadn h\u00e0nh s\u1ebd kh\u00f4ng s\u1eed d\u1ee5ng.<\/p>\n<h2>Hai d\u1ea1ng: Contactor v\u00e0 Breaker<\/h2>\n<p>Hi\u1ec3u \u0111\u01b0\u1ee3c lo\u1ea1i d\u1ea1ng b\u1ea1n \u0111ang s\u1eed d\u1ee5ng s\u1ebd ng\u0103n ng\u1eeba h\u1ea7u h\u1ebft c\u00e1c sai s\u00f3t v\u1ec1 \u0111\u1eb7c t\u1ea3 v\u00ec hai thu\u1eadt ng\u1eef n\u00e0y kh\u00e1c bi\u1ec7t v\u00e0 kh\u00f4ng ph\u1ee5c v\u1ee5 c\u00f9ng m\u1ed9t m\u1ee5c \u0111\u00edch trong h\u1ec7 th\u1ed1ng.<\/p>\n<table>\n<tbody>\n<tr>\n<th><\/th>\n<th>B\u1ed9 kh\u1edfi \u0111\u1ed9ng d\u1ef1a tr\u00ean contactor<\/th>\n<th>C\u1ea7u dao<\/th>\n<\/tr>\n<tr>\n<td>C\u01a1 ch\u1ebf gi\u1eef<\/td>\n<td>Cu\u1ed9n d\u00e2y gi\u1eef \u0111i\u1ec7n c\u00f9ng ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 gi\u1eef<\/td>\n<td>Ch\u1ed1t c\u01a1 h\u1ecdc<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u g\u00ec x\u1ea3y ra khi m\u1ea5t ngu\u1ed3n<\/td>\n<td>Cu\u1ed9n d\u00e2y m\u1ea5t \u0111i\u1ec7n, ti\u1ebfp \u0111i\u1ec3m ch\u00ednh m\u1edf t\u1ef1 \u0111\u1ed9ng<\/td>\n<td>Gi\u1eef \u0111\u00f3ng \u2014 ch\u1ed1t kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi m\u1ea5t ngu\u1ed3n<\/td>\n<\/tr>\n<tr>\n<td>No-volt release \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi<\/td>\n<td>Ch\u00ednh cu\u1ed9n d\u00e2y, kh\u00f4ng t\u1ed1n th\u00eam chi ph\u00ed<\/td>\n<td>Ph\u1ee5 ki\u1ec7n ng\u1eaft \u0111i\u1ec7n \u00e1p th\u1ea5p ri\u00eang bi\u1ec7t trong khe cu\u1ed9n d\u00e2y<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1edfi \u0111\u1ed9ng l\u1ea1i sau m\u1ea5t \u0111i\u1ec7n<\/td>\n<td>Kh\u00f4ng th\u1ec3 n\u1ebfu kh\u00f4ng nh\u1ea5n n\u00fat kh\u1edfi \u0111\u1ed9ng l\u1ea1i<\/td>\n<td>Kh\u00f4ng th\u1ec3 ch\u1ec9 khi c\u00f3 UVR; n\u1ebfu kh\u00f4ng c\u00f3, breaker s\u1ebd gi\u1eef \u0111\u00f3ng<\/td>\n<\/tr>\n<tr>\n<td>\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/td>\n<td>B\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1: DOL, sao-\u0111am, kh\u1edfi \u0111\u1ed9ng m\u1ec1m, contactor VFD<\/td>\n<td>B\u1ed9 c\u00e1ch ly m\u00e1y, b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u1ed9ng c\u01a1, breaker \u0111\u1ea7u v\u00e0o ATS, b\u1ea3o v\u1ec7 feeder<\/td>\n<\/tr>\n<tr>\n<td>Ti\u00eau chu\u1ea9n qu\u1ea3n l\u00fd<\/td>\n<td>IEC\/EN 60947-4-1<\/td>\n<td>IEC\/EN 60947-2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V\u00ed d\u1ee5 v\u1edbi contactor gi\u1ea3i th\u00edch t\u1ea1i sao thu\u1eadt ng\u1eef \u201cno-volt release\u201d ph\u1ed5 bi\u1ebfn trong ti\u00eau chu\u1ea9n Anh v\u00e0 Kh\u1ed1i Th\u1ecbnh v\u01b0\u1ee3ng chung; v\u00ec m\u1ed7i b\u1ed9 kh\u1edfi \u0111\u1ed9ng DOL \u0111\u1ec1u c\u00f3 c\u01a1 ch\u1ebf n\u00e0y d\u00f9 c\u00f3 \u0111\u1eb7c t\u1ea3 hay kh\u00f4ng, do \u0111\u00f3 t\u1ea1o ra t\u1eeb vi\u1ebft t\u1eaft TONVR (qu\u00e1 t\u1ea3i nhi\u1ec7t, no-volt release) nh\u01b0 m\u00f4 t\u1ea3 b\u1ea3o v\u1ec7 ti\u00eau chu\u1ea9n c\u1ee7a b\u1ed9 kh\u1edfi \u0111\u1ed9ng. V\u00ed d\u1ee5 v\u1edbi breaker gi\u1ea3i th\u00edch t\u1ea1i sao c\u00f9ng \u0111\u1eb7c t\u1ea3 c\u00f3 th\u1ec3 t\u1ed1n k\u00e9m; v\u00ec n\u1ebfu thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb ph\u00eda tr\u00ean l\u00e0 breaker v\u1ecf \u0111\u00fac thay v\u00ec contactor, ch\u1ee9c n\u0103ng an to\u00e0n d\u1ef1 ph\u00f2ng ph\u1ea3i \u0111\u01b0\u1ee3c mua ri\u00eang nh\u01b0 m\u1ed9t ph\u1ee5 ki\u1ec7n. T\u1eeb c\u00e1c v\u00ed d\u1ee5 n\u00e0y, c\u00f3 th\u1ec3 r\u00fat ra quy t\u1eafc; n\u1ebfu thi\u1ebft b\u1ecb ng\u1eaft l\u00e0 contactor, ch\u1ee9c n\u0103ng mi\u1ec5n ph\u00ed, c\u00f2n n\u1ebfu l\u00e0 breaker, ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i y\u00eau c\u1ea7u ri\u00eang ph\u1ea7n UVR v\u00e0 x\u00e1c nh\u1eadn c\u00f3 khe tr\u1ed1ng trong khung cho cu\u1ed9n d\u00e2y.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4239\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/UVR-vs-Shunt-Trip.webp\" alt=\"UVR v\u00e0 Shunt Trip\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>UVR v\u00e0 Shunt Trip<\/h2>\n<p>M\u1eb7c d\u00f9 tr\u00f4ng gi\u1ed1ng nhau v\u00e0 \u0111\u01b0\u1ee3c l\u1eafp \u1edf c\u00f9ng v\u1ecb tr\u00ed, shunt trip ph\u1ee5 v\u00e0 undervoltage release ph\u1ee5 th\u01b0\u1eddng b\u1ecb nh\u1ea7m l\u1eabn trong \u0111\u01a1n \u0111\u1eb7t h\u00e0ng v\u00ec ch\u00fang ph\u1ee5c v\u1ee5 ch\u1ee9c n\u0103ng ho\u00e0n to\u00e0n kh\u00e1c nhau. Tr\u1ed9n l\u1eabn hai ph\u1ee5 ki\u1ec7n n\u00e0y r\u1ea5t nguy hi\u1ec3m v\u00ec shunt trip kh\u00f4ng cung c\u1ea5p c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7 n\u00e0o khi d\u00e2y \u0111i\u1ec1u khi\u1ec3n b\u1ecb \u0111\u1ee9t.<\/p>\n<table>\n<tbody>\n<tr>\n<th><\/th>\n<th>Gi\u1ea3i ph\u00f3ng d\u01b0\u1edbi \u0111i\u1ec7n \u00e1p (no-volt, UVR, lo\u1ea1i MN)<\/th>\n<th>Shunt trip (SHT, lo\u1ea1i MX)<\/th>\n<\/tr>\n<tr>\n<td>K\u00edch ho\u1ea1t<\/td>\n<td>M\u1ea5t \u0111i\u1ec7n \u00e1p cu\u1ed9n d\u00e2y, d\u01b0\u1edbi 0,35 \u00d7 U<sub>n<\/sub><\/td>\n<td>\u1ee8ng d\u1ee5ng \u0111i\u1ec7n \u00e1p tr\u00ean 0,7 \u00d7 U<sub>n<\/sub>, nh\u01b0 m\u1ed9t xung \u00edt nh\u1ea5t 20 ms<\/td>\n<\/tr>\n<tr>\n<td>H\u00e0nh vi khi c\u00e1p \u0111i\u1ec1u khi\u1ec3n b\u1ecb c\u1eaft<\/td>\n<td>Thi\u1ebft b\u1ecb ng\u1eaft \u2014 an to\u00e0n theo m\u1eb7c \u0111\u1ecbnh<\/td>\n<td>Kh\u00f4ng c\u00f3 g\u00ec x\u1ea3y ra \u2014 l\u1ec7nh ng\u1eaft kh\u00f4ng bao gi\u1edd \u0111\u1ebfn<\/td>\n<\/tr>\n<tr>\n<td>H\u00e0nh vi khi m\u1ea5t \u0111i\u1ec7n<\/td>\n<td>Thi\u1ebft b\u1ecb m\u1edf<\/td>\n<td>Thi\u1ebft b\u1ecb v\u1eabn \u0111\u00f3ng<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u00f3ng l\u1ea1i<\/td>\n<td>Ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e9p tr\u00ean kho\u1ea3ng 0,85 \u00d7 U<sub>n<\/sub>, v\u00e0 ch\u1ec9 b\u1eb1ng h\u00e0nh \u0111\u1ed9ng c\u00f3 ch\u1ee7 \u00fd<\/td>\n<td>\u0110\u01b0\u1ee3c ph\u00e9p b\u1ea5t c\u1ee9 khi n\u00e0o c\u00f3 l\u1ec7nh \u0111\u01b0\u1ee3c ph\u00e1t ra<\/td>\n<\/tr>\n<tr>\n<td>Cu\u1ed9n d\u00e2y c\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n li\u00ean t\u1ee5c kh\u00f4ng?<\/td>\n<td>C\u00f3 \u2014 \u0111\u00f3 l\u00e0 c\u00e1ch gi\u1eef thi\u1ebft b\u1ecb \u0111\u00f3ng<\/td>\n<td>Kh\u00f4ng \u2014 n\u00f3 \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n theo xung<\/td>\n<\/tr>\n<tr>\n<td>\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/td>\n<td>M\u1ea1ch d\u1eebng kh\u1ea9n c\u1ea5p, ng\u0103n ch\u1eb7n kh\u1edfi \u0111\u1ed9ng l\u1ea1i kh\u00f4ng gi\u00e1m s\u00e1t, an to\u00e0n m\u00e1y m\u00f3c, cho ph\u00e9p ngu\u1ed3n \u0111i\u1ec7n kh\u1ecfe m\u1ea1nh trong c\u00e1c s\u01a1 \u0111\u1ed3 chuy\u1ec3n \u0111\u1ed5i<\/td>\n<td>Ng\u1eaft t\u1eeb xa t\u1eeb r\u01a1le b\u1ea3o v\u1ec7, li\u00ean kh\u00f3a b\u00e1o ch\u00e1y, gi\u1ea3m t\u1ea3i, ng\u1eaft do BMS kh\u1edfi x\u01b0\u1edbng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>M\u1ed9t c\u00e1ch d\u1ec5 nh\u1edb s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa hai ph\u1ee5 ki\u1ec7n l\u00e0 shunt trip y\u00eau c\u1ea7u m\u1ed9t l\u1ec7nh trong khi undervoltage release y\u00eau c\u1ea7u s\u1ef1 \u0111\u1ea3m b\u1ea3o. N\u00f3i c\u00e1ch kh\u00e1c, shunt trip ch\u1edd l\u1ec7nh \u0111\u1ec3 ng\u1eaft, nh\u01b0ng undervoltage release gi\u1eef thi\u1ebft b\u1ecb \u0111\u00f3ng cho \u0111\u1ebfn khi m\u1ea5t \u0111i\u1ec7n; n\u00f3 m\u1edf ngay khi m\u1ea5t \u0111i\u1ec7n. Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp tr\u01b0\u1edbc \u0111\u00f3, c\u1ea3 hai \u0111\u1ec1u cung c\u1ea5p c\u01a1 ch\u1ebf ng\u1eaft b\u00ean ngo\u00e0i v\u01b0\u1ee3t qua thi\u1ebft b\u1ecb ng\u1eaft nhi\u1ec7t-t\u1eeb ho\u1eb7c \u0111i\u1ec7n t\u1eed b\u00ean trong b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n; tuy nhi\u00ean, ch\u1ec9 c\u00f3 m\u1ed9t lo\u1ea1i \u0111\u1ea3m b\u1ea3o an to\u00e0n khi h\u1ecfng. Khi m\u1ee5c ti\u00eau l\u00e0 an to\u00e0n cho nh\u00e2n s\u1ef1, s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 \u0111i\u1ec3m m\u1ea5u ch\u1ed1t, v\u00e0 c\u1ea7n l\u01b0u \u00fd r\u1eb1ng ng\u1eaft qu\u00e1 d\u00f2ng c\u1ee7a b\u1ed9 ng\u1eaft c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n, \u0111\u00e2y l\u00e0 ch\u1ee7 \u0111\u1ec1 ri\u00eang \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-causes-a-circuit-breaker-to-trip\/\">nguy\u00ean nh\u00e2n khi\u1ebfn b\u1ed9 ng\u1eaft m\u1ea1ch ng\u1eaft<\/a>.<\/p>\n<h2>N\u01a1i s\u1eed d\u1ee5ng<\/h2>\n<p>C\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c chia th\u00e0nh nh\u1eefng \u1ee9ng d\u1ee5ng c\u1ea7n thi\u1ebft v\u1ec1 an to\u00e0n v\u00e0 nh\u1eefng \u1ee9ng d\u1ee5ng h\u01b0\u1edbng \u0111\u1ebfn quy tr\u00ecnh, do \u0111\u00f3 thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng y\u00eau c\u1ea7u an to\u00e0n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng hi\u1ec7u qu\u1ea3.<\/p>\n<ul>\n<li>B\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1. B\u1ed9 kh\u1edfi \u0111\u1ed9ng lo\u1ea1i DOL ho\u1eb7c sao-\u0111am, b\u1ed9 kh\u1edfi \u0111\u1ed9ng m\u1ec1m v\u00e0 b\u1ed9 kh\u1edfi \u0111\u1ed9ng VFD s\u1eed d\u1ee5ng contactor \u0111\u01b0\u1ee3c gi\u1eef b\u1edfi \u0111i\u1ec7n \u00e1p m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n. T\u00ednh n\u0103ng kh\u00f4ng \u0111i\u1ec7n \u00e1p b\u1ea3o v\u1ec7 v\u00f4 s\u1ed1 thi\u1ebft b\u1ecb kh\u1ecfi vi\u1ec7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i kh\u00f4ng mong mu\u1ed1n.<\/li>\n<li>M\u00e1y c\u00f4ng c\u1ee5 v\u00e0 thi\u1ebft b\u1ecb ch\u1ebf bi\u1ebfn g\u1ed7. C\u01b0a, m\u00e1y phay, m\u00e1y \u00e9p v\u00e0 m\u00e1y khoan l\u00e0 v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh cho s\u1ef1 c\u1ea7n thi\u1ebft c\u1ee7a thi\u1ebft b\u1ecb; n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i kh\u00f4ng mong mu\u1ed1n khi ng\u01b0\u1eddi v\u1eadn h\u00e0nh m\u00e1y thay dao c\u1eaft ho\u1eb7c lo\u1ea1i b\u1ecf m\u1ea1t c\u01b0a. Quy \u0111\u1ecbnh an to\u00e0n m\u00e1y m\u00f3c c\u0169ng quy \u0111\u1ecbnh c\u00e1c bi\u1ec7n ph\u00e1p an to\u00e0n \u0111\u1ec3 tr\u00e1nh kh\u1edfi \u0111\u1ed9ng kh\u00f4ng mong mu\u1ed1n.<\/li>\n<li>M\u1ea1ch d\u1eebng kh\u1ea9n c\u1ea5p. Khi n\u00fat d\u1eebng kh\u1ea9n c\u1ea5p \u0111\u01b0\u1ee3c \u0111\u1ea5u d\u00e2y nh\u01b0 m\u1ed9t ng\u1eaft trong m\u1ea1ch cu\u1ed9n d\u00e2y thay v\u00ec \u0111\u1ea5u d\u00e2y l\u00e0m \u0111\u1ea7u v\u00e0o PLC, n\u00f3 tr\u1edf th\u00e0nh thi\u1ebft b\u1ecb an to\u00e0n khi h\u1ecfng. \u0110\u1ea7u v\u00e0o PLC c\u00f3 th\u1ec3 b\u1ecb \u0111\u1ecdc sai, m\u1ea5t ngu\u1ed3n ho\u1eb7c b\u1ecb l\u1ed7i module; m\u1ed9t ti\u1ebfp \u0111i\u1ec3m n\u1ed1i ti\u1ebfp trong m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n th\u00ec kh\u00f4ng.<\/li>\n<li>Pa l\u0103ng, thang m\u00e1y v\u00e0 c\u1ea7n c\u1ea9u. M\u1ea5t ngu\u1ed3n c\u00f3 th\u1ec3 g\u00e2y ra kh\u1edfi \u0111\u1ed9ng l\u1ea1i kh\u00f4ng ki\u1ec3m so\u00e1t v\u00e0 r\u01a1i t\u1ea3i kh\u00f4ng ki\u1ec3m so\u00e1t.<\/li>\n<li>B\u01a1m kh\u00f4ng gi\u00e1m s\u00e1t v\u00e0 v\u1eadn h\u00e0nh t\u1eeb xa. B\u01a1m gi\u1ebfng khoan, tr\u1ea1m b\u01a1m t\u01b0\u1edbi ti\u00eau v\u00e0 tr\u1ea1m b\u01a1m t\u0103ng \u00e1p t\u1eeb xa ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng c\u00f3 ng\u01b0\u1eddi v\u1eadn h\u00e0nh t\u1ea1i ch\u1ed7. \u0110i\u1ec1u cu\u1ed1i c\u00f9ng ng\u01b0\u1eddi v\u1eadn h\u00e0nh mu\u1ed1n l\u00e0 m\u1ed9t m\u00e1y b\u01a1m b\u1eaft \u0111\u1ea7u ho\u1ea1t \u0111\u1ed9ng l\u1ea1i trong \u0111\u01b0\u1eddng \u1ed1ng kh\u00f4 ho\u1eb7c \u0111\u01b0\u1eddng \u1ed1ng b\u1ecb t\u1eafc khi c\u00f3 \u0111i\u1ec7n tr\u1edf l\u1ea1i.<\/li>\n<li>Ho\u1ea1t \u0111\u1ed9ng m\u00e1y ph\u00e1t \u0111i\u1ec7n v\u00e0 chuy\u1ec3n \u0111\u1ed5i t\u1ef1 \u0111\u1ed9ng. R\u01a1 le \u0111i\u1ec7n \u00e1p th\u1ea5p s\u1ebd ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t ch\u1ed1t kh\u00f3a cho \u0111\u1ebfn khi ngu\u1ed3n c\u1ea5p \u0111i\u1ec7n \u0111\u1ea7u v\u00e0o th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp.<\/li>\n<li>H\u1ec7 th\u1ed1ng li\u00ean kh\u00f3a b\u00e1o ch\u00e1y v\u00e0 qu\u1ea3n l\u00fd t\u00f2a nh\u00e0. Trong tr\u01b0\u1eddng h\u1ee3p ch\u00e1y, b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n b\u00e1o ch\u00e1y s\u1ebd ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n.<\/li>\n<li>Gi\u1ea3m t\u1ea3i. Khi b\u1ed9 \u0111i\u1ec1u khi\u1ec3n ti\u1ec7n \u00edch ho\u1eb7c t\u1ea1i ch\u1ed7 c\u1ea7n m\u1edf m\u1ea1ch khi c\u00f3 \u0111i\u1ec1u ki\u1ec7n ngu\u1ed3n c\u1ea5p, \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n cung c\u1ea5p m\u1ed9t t\u00f9y ch\u1ecdn \u0111\u1ea5u d\u00e2y c\u1ee9ng.<\/li>\n<\/ul>\n<p>C\u1ea7n l\u01b0u \u00fd trong thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i r\u1eb1ng ch\u1ee9c n\u0103ng ng\u1eaft \u0111i\u1ec7n \u00e1p th\u1ea5p l\u00e0 m\u1ed9t t\u00f9y ch\u1ecdn trong s\u1ed1 nhi\u1ec1u t\u00f9y ch\u1ecdn chi\u1ebfm c\u00f9ng m\u1ed9t v\u1ecb tr\u00ed, c\u00f9ng v\u1edbi c\u00e1c ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 tr\u1ee3 v\u00e0 b\u00e1o \u0111\u1ed9ng, ng\u1eaft m\u1ea1ch shunt, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 v\u00e0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n quay tay. M\u1ed9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt cho b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 UVR ph\u1ea3i \u0111\u1ea3m b\u1ea3o x\u00e1c nh\u1eadn b\u1ed9 ph\u1ee5 ki\u1ec7n tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng v\u00e0 quy\u1ebft \u0111\u1ecbnh: vi\u1ec7c b\u1ea3o v\u1ec7 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t l\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac hay thi\u1ebft b\u1ecb nh\u1ecf g\u1ecdn l\u00e0 quy\u1ebft \u0111\u1ecbnh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c ph\u1ee5 ki\u1ec7n c\u00f3 t\u1ed3n t\u1ea1i hay kh\u00f4ng, nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp trong h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-mccb-and-mcb\/\">s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa MCCB v\u00e0 MCB<\/a>.<\/p>\n<h2>C\u00e1c l\u1ef1a ch\u1ecdn thay th\u1ebf v\u00e0 thay th\u1ebf<\/h2>\n<p>Ch\u1ee9c n\u0103ng an to\u00e0n kh\u00f4ng th\u1ec3 thay th\u1ebf ho\u00e0n to\u00e0n, tuy nhi\u00ean, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 ph\u1ecfng b\u1eb1ng c\u00e1c s\u1ea3n ph\u1ea9m ph\u1ee5 kh\u00e1c nhau m\u00e0 m\u1ed7i lo\u1ea1i \u0111\u1ec1u c\u00f3 r\u1ee7i ro ri\u00eang.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn<\/th>\n<th>Nh\u1eefng g\u00ec n\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c<\/th>\n<th>S\u1ef1 \u0111\u00e1nh \u0111\u1ed5i<\/th>\n<\/tr>\n<tr>\n<td>M\u1ea1ch gi\u1eef ti\u1ebfp \u0111i\u1ec3m (ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 NO song song v\u1edbi n\u00fat kh\u1edfi \u0111\u1ed9ng)<\/td>\n<td>Ng\u1eaft \u0111i\u1ec7n \u00e1p kh\u00f4ng \u0111i\u1ec7n \u00e1p c\u1ed5 \u0111i\u1ec3n \u2014 kh\u1edfi \u0111\u1ed9ng l\u1ea1i y\u00eau c\u1ea7u h\u00e0nh \u0111\u1ed9ng c\u00f3 ch\u1ee7 \u00fd<\/td>\n<td>Ch\u1ec9 \u00e1p d\u1ee5ng khi t\u1ea3i \u0111\u01b0\u1ee3c chuy\u1ec3n m\u1ea1ch b\u1eb1ng ti\u1ebfp \u0111i\u1ec3m, kh\u00f4ng ph\u1ea3i b\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ee5 ki\u1ec7n ng\u1eaft \u0111i\u1ec7n \u00e1p th\u1ea5p tr\u00ean b\u1ed9 ng\u1eaft m\u1ea1ch<\/td>\n<td>H\u00e0nh vi an to\u00e0n t\u01b0\u01a1ng t\u1ef1 tr\u00ean c\u00e1c thi\u1ebft b\u1ecb kh\u00f3a c\u01a1 h\u1ecdc<\/td>\n<td>Chi ph\u00ed th\u00eam, chi\u1ebfm m\u1ed9t khe cu\u1ed9n d\u00e2y, c\u1ea7n ngu\u1ed3n \u0111i\u1ec1u khi\u1ec3n li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>Ng\u1eaft shunt c\u1ed9ng v\u1edbi r\u01a1 le ho\u1eb7c logic PLC<\/td>\n<td>C\u00f3 th\u1ec3 m\u00f4 ph\u1ecfng vi\u1ec7c c\u1ea5m kh\u1edfi \u0111\u1ed9ng l\u1ea1i b\u1eb1ng l\u1eadp tr\u00ecnh<\/td>\n<td>H\u1ecfng an to\u00e0n: n\u1ebfu logic ho\u1eb7c ngu\u1ed3n c\u1ea5p c\u1ee7a n\u00f3 m\u1ea5t, b\u1ed9 ng\u1eaft v\u1eabn \u0111\u00f3ng. Kh\u00f4ng ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c nh\u01b0 m\u1ed9t ch\u1ee9c n\u0103ng an to\u00e0n<\/td>\n<\/tr>\n<tr>\n<td>R\u01a1 le b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 v\u1edbi c\u1ea5m kh\u1edfi \u0111\u1ed9ng l\u1ea1i<\/td>\n<td>Ch\u1eb7n kh\u1edfi \u0111\u1ed9ng l\u1ea1i \u0111i\u1ec7n t\u1eed sau khi ng\u1eaft ho\u1eb7c m\u1ea5t ngu\u1ed3n, th\u01b0\u1eddng c\u00f3 \u0111\u1ed9 tr\u1ec5 \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c<\/td>\n<td>Ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c r\u01a1 le \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n v\u00e0 c\u1ea5u h\u00ecnh \u0111\u00fang; kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u1ea3m b\u1ea3o \u0111\u1ea5u d\u00e2y c\u1ee9ng<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 kh\u1edfi \u0111\u1ed9ng m\u1ec1m ho\u1eb7c VFD v\u1edbi gi\u00e1m s\u00e1t \u0111i\u1ec7n \u00e1p th\u1ea5p<\/td>\n<td>Configurable restart behaviour, including inhibited restart<\/td>\n<td>Same dependency on electronics; also adds a variable to commissioning<\/td>\n<\/tr>\n<tr>\n<td>Mechanically latched contactor<\/td>\n<td>Retains its last state across a supply loss<\/td>\n<td>The opposite behaviour \u2014 it can restart unexpectedly. Used deliberately where auto-restart is wanted, never as a safety device<\/td>\n<\/tr>\n<tr>\n<td>Local isolator with lock-off<\/td>\n<td>Personnel protection during maintenance<\/td>\n<td>Protects the maintainer, not the operator during an unattended outage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>There is a pattern to the contents of the table that deserves to be underlined: while physical solutions guarantee the reliability of the system, electrical systems do not. Indeed, a loss of Control Voltage cannot be misinterpreted, while a PLC input can be read incorrectly. This is why the fail-safe principle suggests that there should always be a hard-wire option for anything that protects human life, while all other operational features can be accomplished electronically.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4240\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/Do-You-Need-UVR.webp\" alt=\"\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>B\u1ea1n c\u00f3 c\u1ea7n thi\u1ebft b\u1ecb n\u00e0y kh\u00f4ng?<\/h2>\n<p>To put it quite frankly, the chances are that you have one on any motor that is controlled by a contactor. The real issue is whether the other devices that aren\u2019t controlled by a contactor need one. It would be beneficial to make a short checklist.<\/p>\n<p>You will need one if any of the following is true: there\u2019s a possibility of shock from an unexpected restart; the load is a motor and there is a chance of damage as a result of sustained undervoltage; the system must shut down safely if the control cable is cut; the application is run unattended; there is a requirement to disconnect the load under certain conditions (fire or gas); or if the transfer scheme must confirm that the source is in good health before closing.<\/p>\n<p>You might not need one if the equipment in question is attended and under local manual control; if the load is a resistive circuit or if there are no safety hazards associated with the circuit; or if an inconvenience associated with restarting the system after a shutdown is acceptable and the design uses a latching mechanism. In this last instance, the need for interlocks should be addressed in the design decision, rather than merely allowing the default behavior of the protection device to govern.<\/p>\n<h2>Specifying and Testing<\/h2>\n<p>Four specification points confirm whether the device works properly.<\/p>\n<ul>\n<li>Connect the coil to the control power, not to the line power. This is the most common mistake made in the field, which results in the most misleading symptom \u2013 a brand new undervoltage trip that is &#8220;not working&#8221;. The voltage rating of the coil is not the same as that of the power poles of the breaker, but the voltage rating of the control voltage that is generated by the panel such as 24 \u2013 30 V DC, 110 \u2013 130 V AC\/DC, or 220 \u2013 240 V AC\/DC. Check the voltage rating of the coil on the control circuit diagram in order to avoid premature assumptions about mechanical problems, and realize that many of the accessories that are returned because they &#8220;don&#8217;t work&#8221; are really just ones with the wrong coil.<\/li>\n<li>Select the time delay version with care. For applications that experience voltage dips less than 200 ms followed by a resumption of the process that is being controlled, the time delay version is more than likely to provide unnecessary tripping. For these applications, the instantaneous version would provide better protection.<\/li>\n<li>Confirm that closing is being inhibited. The purpose of the accessory is to not only trip but to refuse to close the circuit until after voltage is restored to 85 % of its rated voltage or higher. Verification should be done at commissioning rather than relying upon assumptions.<\/li>\n<li>Put the coil on a periodic test schedule. Manufacturers recommend the routine testing of trip coils \u2013 usually at least every six months \u2013 because a failed coil will not be distinguishable from a functioning coil until it is needed.Testing a suspect device for electrical integrity uses the same techniques as diagnosing any other breaker fault, which our guide to <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-to-tell-if-a-breaker-is-bad\/\">c\u00e1ch nh\u1eadn bi\u1ebft m\u1ed9t c\u1ea7u dao b\u1ecb h\u1ecfng<\/a> covers in detail.<\/li>\n<\/ul>\n<p>In cases where components are selected for a panel instead of being replaced in it, the protection layer should be specified as a package, including the breaker, associated accessories, and certified miniature devices installed on the same DIN rail.The HUM18-63N range is an example of the type of device that fills that role \u2014 a certified miniature circuit breaker line spanning 1P to 4P at 63 A with B, C, and D curves \u2014 and its <a href=\"https:\/\/huyuglobal.com\/vi\/product\/hum18-63n-mcb-1p-to-4p-63a-type-b-c-d\/\">HUM18-63N MCB product page<\/a> shows the specification format buyers should expect to see documented.<\/p>\n<h2>Common Mistakes<\/h2>\n<ul>\n<li>Ordering a shunt trip for use with a no-voltage release \u2014 both part numbers look similar and fit into the same terminal slots, but one method has a failsafe and the other does not.<\/li>\n<li>Hooking the coil to the line voltage. This guarantees either an burnt coil or a piece of equipment that stays open.<\/li>\n<li>Treating a mechanically-latched contactor as a failsafe. This design will actually keep its state, which is anything but what should happen.<\/li>\n<li>Making the emergency-stop function a purely software function on the PLC (no hard wiring). A software e-stop is not a failsafe e-stop; it is the hard wire break in the control circuit that guarantees the e-stop effect.<\/li>\n<li>Failing to implement the time-delay feature at a job site that is prone to fluctuations in voltage. The result is that your operation will experience nuisance shutdowns; once there are nuisance shutdowns occurring, the failover protection has been removed.<\/li>\n<li>Forgetting to include the accessory stack. A frame with one coil slot cannot house both a UVR and a shunt trip.<\/li>\n<li>Never performing a test on the coil itself. Failure is not visible UNTIL the time it becomes critical.<\/li>\n<\/ul>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>What is the main function of a no-volt coil?<\/h3>\n<p>The purpose of the no volt coil is to maintain energy to the controlling device as long as the control voltage is being supplied. If there is a loss of control voltage the coil will open the circuit to prevent the resetting of the equipment from taking place automatically as the electricity is restored. The coil does this directly in a contactor starter by supplying the control voltage that holds the contactor in, but in other cases, a separate accessory for undervoltage release is provided to hold the mechanical latching mechanism. There is an additional function of providing protection for continuous undervoltage which could cause overheating and damage motors.<\/p>\n<h3>What is the difference between NC and NO contacts?<\/h3>\n<p>A normally open (NO) contact is open when at rest and will close when it is actuated, whereas a normally closed (NC) contact is closed when at rest and will open when it is actuated. The circuit creates a two-step operation of the contacts: the start pushbutton and holding contacts are NO so that pressing the button establishes the circuit; while the stop button, emergency stop, and overload relay contacts are NC to allow normal operation as long as they remain closed. NC contacts are utilized in safety circuits because they result in an \u201coff\u201d condition in the event of an equipment failure instead of a \u201cpermissive\u201d action.<\/p>\n<h3>What is a no volt contact?<\/h3>\n<p>In a contactor starter, the no-volt contact is the auxiliary normally-open contact in parallel with the start push button, also known as the holding contact. The start button is pressed to energize the coil and the main contacts close. The auxiliary contact also closes and provides a path for the coil current to the device. This feature makes the circuit self-sustaining. The no-volt release works because the coil current depends on the control power through the contact. Therefore, if there is any loss of the control power, the coil loses power. If the holding contact is faulty, the motor can be started only when the button is pressed.<\/p>\n<h3>Does a DOL starter already include no-volt release?<\/h3>\n<p>Yes, all direct-on-line starters with electromagnetically held contactors include no-volt release. The acronym used for thermal overload protection with no-volt release is TONVR. There is no need to purchase any additional auxiliary. The device becomes an extra line item in the case of a mechanically latched circuit breaker.<\/p>\n<h3>Why is my undervoltage release tripping for no apparent reason?<\/h3>\n<p>There are a few reasons for the trip that occur usually in this situation. If a trip happens when other equipment starts, the installation should be updated to have a time-delay release. If the coil power is shared with other loads, the no-volt release may operate within the indeterminate band. The problem can be resolved by having an auxiliary power supply to the no-volt release.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.se.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Schneider Electric \u2014 Undervoltage and Shunt Trip Release Technical Documentation<\/a><\/li>\n<li><a href=\"https:\/\/www.abb.com\/\" rel=\"nofollow noopener\" target=\"_blank\">ABB \u2014 Circuit Breaker Accessories: Undervoltage Releases<\/a><\/li>\n<li><a href=\"https:\/\/www.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">International Electrotechnical Commission \u2014 IEC 60947-2 and IEC 60947-4-1<\/a><\/li>\n<li><a href=\"https:\/\/eur-lex.europa.eu\/legal-content\/EN\/TXT\/?uri=CELEX:32006L0042\" rel=\"nofollow noopener\" target=\"_blank\">EUR-Lex \u2014 Machinery Directive 2006\/42\/EC<\/a><\/li>\n<li><a href=\"https:\/\/www.hse.gov.uk\/\" rel=\"nofollow noopener\" target=\"_blank\">Health and Safety Executive \u2014 Guidance on Machinery Safety and Unexpected Start-Up<\/a><\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>You may think the function of a no-volt release is quite extensive based only on its name, but this is not the case. Its high price is not an indication of the importance of the product either, since it does not properly check for voltage nor is it a general-purpose fall-back system. All it does is indicate when the control voltage is present so that it can be used as the initial condition for moving ahead when the voltage is safe and does not have to be checked. The no-volt release provides a great deal of benefit from this simple function. You will be able to restart following a power failure, disconnect during undervoltage conditions, use the no-volt release automatically in the event that the cable breaks and finally, prevent the circuit breaker from closing on no-load conditions. If you have a contactor starter, there is no additional cost for this no-volt relaunch system. If you have a circuit breaker, you will need to purchase it separately. Simply match the voltage of the coil and load, determine if there is a need for delay, and test the coil from time to time. As long as this approach is followed the consequences of having the no-volt release will be ensured, simulating what the safety system needs to provide.<\/p>","protected":false},"excerpt":{"rendered":"<p>A no-volt release provides an answer to a question that every control panel manufacturer and machine designer must ask themselves at one point: &#8220;What will happen if power comes off and comes back on?&#8221; Saying that &#8220;the machine starts all by itself&#8221; is not acceptable for machines with rotating knives, loaded conveyors, and pressure pumps. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4241,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4237","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\/4237","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=4237"}],"version-history":[{"count":3,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4237\/revisions"}],"predecessor-version":[{"id":4244,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4237\/revisions\/4244"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/4241"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=4237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=4237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=4237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}