{"id":21542,"date":"2026-02-08T14:36:46","date_gmt":"2026-02-08T06:36:46","guid":{"rendered":"https:\/\/viox.com\/?p=21542"},"modified":"2026-02-08T14:36:49","modified_gmt":"2026-02-08T06:36:49","slug":"electronic-mccb-trip-units-emi-mitigation","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/electronic-mccb-trip-units-emi-mitigation\/","title":{"rendered":"\u1ea2nh h\u01b0\u1edfng c\u1ee7a EMI l\u00ean b\u1ed9 ph\u1eadn Trip \u0111i\u1ec7n t\u1eed c\u1ee7a MCCB: Ph\u00e2n t\u00edch &amp; Gi\u1ea3m thi\u1ec3u"},"content":{"rendered":"<div class=\"product-intro\">\n<p>C\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed trong <a href=\"https:\/\/test.viox.com\/vi\/mccb\/\">\u5851\u58f3\u65ad\u8def\u5668\uff08MCCB\uff09<\/a> c\u00f3 th\u1ec3 b\u1ecb tr\u1ee5c tr\u1eb7c khi ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec5u \u0111i\u1ec7n t\u1eeb, g\u00e2y ra c\u00e1c s\u1ef1 c\u1ed1 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng b\u1ea5t ng\u1edd, khi\u1ebfn c\u00e1c c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p thi\u1ec7t h\u1ea1i h\u00e0ng ngh\u00ecn \u0111\u00f4 la m\u1ed7i gi\u1edd. H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n n\u00e0y xem x\u00e9t c\u00e1ch EMI \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft MCCB \u0111i\u1ec7n t\u1eed, c\u00e1c c\u01a1 ch\u1ebf g\u00e2y nhi\u1ec5u c\u01a1 b\u1ea3n v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u00e1ng tin c\u1eady trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t v\u1ec1 \u0111i\u1ec7n t\u1eeb.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Industrial-electrical-panel-with-electronic-MCCB-trip-units-in-electromagnetic-environment-VIOX-Electric.webp\" alt=\"Industrial electrical panel with electronic MCCB trip units in electromagnetic environment - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px; font-size: 0.9em;\">T\u1ee7 \u0111i\u1ec7n c\u00f4ng nghi\u1ec7p v\u1edbi c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft MCCB \u0111i\u1ec7n t\u1eed trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb \u2013 VIOX Electric<\/figcaption><\/figure>\n<h2>Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h2>\n<ul>\n<li><strong>T\u00ednh d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng c\u1ee7a EMI<\/strong>: C\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed d\u1ec5 b\u1ecb nhi\u1ec5u \u0111i\u1ec7n t\u1eeb h\u01a1n t\u1eeb 3 \u0111\u1ebfn 5 l\u1ea7n so v\u1edbi c\u00e1c lo\u1ea1i t\u1eeb nhi\u1ec7t do m\u1ea1ch vi x\u1eed l\u00fd nh\u1ea1y c\u1ea3m<\/li>\n<li><strong>C\u00e1c ch\u1ebf \u0111\u1ed9 l\u1ed7i<\/strong>: EMI c\u00f3 th\u1ec3 g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng ng\u1eaft kh\u00f4ng c\u1ea7n thi\u1ebft (40% tr\u01b0\u1eddng h\u1ee3p), \u0111\u1ecdc sai (35%), ho\u1eb7c kh\u00f3a ho\u00e0n to\u00e0n (25%) trong MCCB \u0111i\u1ec7n t\u1eed<\/li>\n<li><strong>T\u1ea7n s\u1ed1 quan tr\u1ecdng<\/strong>: H\u1ea7u h\u1ebft nhi\u1ec5u x\u1ea3y ra trong d\u1ea3i t\u1ea7n t\u1eeb 150 kHz \u0111\u1ebfn 30 MHz \u0111\u1ed1i v\u1edbi EMI d\u1eabn v\u00e0 80 MHz \u0111\u1ebfn 1 GHz \u0111\u1ed1i v\u1edbi EMI b\u1ee9c x\u1ea1<\/li>\n<li><strong>Ti\u00eau Chu\u1ea9n Tu\u00e2n<\/strong>: IEC 60947-2 quy \u0111\u1ecbnh th\u1eed nghi\u1ec7m kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m \u1edf m\u1ee9c 10 V\/m \u0111\u1ed1i v\u1edbi tr\u01b0\u1eddng b\u1ee9c x\u1ea1 v\u00e0 10V \u0111\u1ed1i v\u1edbi nhi\u1ec5u d\u1eabn<\/li>\n<li><strong>T\u00e1c \u0111\u1ed9ng chi ph\u00ed<\/strong>: C\u00e1c s\u1ef1 c\u1ed1 ng\u1eaft kh\u00f4ng c\u1ea7n thi\u1ebft li\u00ean quan \u0111\u1ebfn EMI khi\u1ebfn c\u00e1c c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p thi\u1ec7t h\u1ea1i t\u1eeb 5.000 \u0111\u1ebfn 50.000 \u0111\u00f4 la cho m\u1ed7i s\u1ef1 c\u1ed1 do th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng v\u00e0 m\u1ea5t s\u1ea3n l\u01b0\u1ee3ng<\/li>\n<\/ul>\n<h2>T\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft MCCB \u0111i\u1ec7n t\u1eed<\/h2>\n<p>C\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed th\u1ec3 hi\u1ec7n m\u1ed9t b\u01b0\u1edbc ti\u1ebfn \u0111\u00e1ng k\u1ec3 trong c\u00f4ng ngh\u1ec7 b\u1ea3o v\u1ec7 m\u1ea1ch, thay th\u1ebf c\u00e1c c\u01a1 ch\u1ebf t\u1eeb nhi\u1ec7t truy\u1ec1n th\u1ed1ng b\u1eb1ng c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean vi x\u1eed l\u00fd. C\u00e1c thi\u1ebft b\u1ecb tinh vi n\u00e0y li\u00ean t\u1ee5c theo d\u00f5i d\u00f2ng \u0111i\u1ec7n th\u00f4ng qua c\u00e1c c\u1ea3m bi\u1ebfn ch\u00ednh x\u00e1c v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c thu\u1eadt to\u00e1n ph\u1ee9c t\u1ea1p \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh khi n\u00e0o c\u1ea7n th\u1ef1c hi\u1ec7n h\u00e0nh \u0111\u1ed9ng b\u1ea3o v\u1ec7. Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c thi\u1ebft b\u1ecb t\u1eeb nhi\u1ec7t ti\u1ec1n nhi\u1ec7m d\u1ef1a tr\u00ean c\u00e1c \u0111\u1eb7c t\u00ednh v\u1eadt l\u00fd c\u1ee7a d\u1ea3i l\u01b0\u1ee1ng kim v\u00e0 cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb, c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed x\u1eed l\u00fd t\u00edn hi\u1ec7u \u0111i\u1ec7n m\u1ed9t c\u00e1ch k\u1ef9 thu\u1eadt s\u1ed1, cho ph\u00e9p c\u00e0i \u0111\u1eb7t c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh, kh\u1ea3 n\u0103ng giao ti\u1ebfp v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh b\u1ea3o v\u1ec7 ch\u00ednh x\u00e1c.<\/p>\n<p>C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed bao g\u1ed3m m\u00e1y bi\u1ebfn d\u00f2ng (CT) ho\u1eb7c cu\u1ed9n Rogowski \u0111\u1ec3 c\u1ea3m bi\u1ebfn, b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng t\u1ef1 sang s\u1ed1 (ADC), b\u1ed9 vi \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c b\u1ed9 x\u1eed l\u00fd t\u00edn hi\u1ec7u s\u1ed1 (DSP), m\u1ea1ch cung c\u1ea5p \u0111i\u1ec7n v\u00e0 tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n \u0111\u1ea7u ra cho c\u01a1 ch\u1ebf ng\u1eaft. Ki\u1ebfn tr\u00fac k\u1ef9 thu\u1eadt s\u1ed1 n\u00e0y cung c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 t\u00ednh linh ho\u1ea1t v\u01b0\u1ee3t tr\u1ed9i nh\u01b0ng l\u1ea1i l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng b\u1ecb nhi\u1ec5u \u0111i\u1ec7n t\u1eeb, c\u00f3 th\u1ec3 l\u00e0m gi\u00e1n \u0111o\u1ea1n ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. B\u1ed9 vi x\u1eed l\u00fd ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 xung nh\u1ecbp th\u01b0\u1eddng t\u1eeb 8 MHz \u0111\u1ebfn 100 MHz, v\u1edbi m\u1ee9c t\u00edn hi\u1ec7u trong ph\u1ea1m vi t\u1eeb mili v\u00f4n \u0111\u1ebfn v\u00f4n\u2014l\u00e0m cho c\u00e1c m\u1ea1ch n\u00e0y \u0111\u1eb7c bi\u1ec7t d\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi c\u00e1c nhi\u1ec5u \u0111i\u1ec7n t\u1eeb b\u00ean ngo\u00e0i.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Cutaway-diagram-of-electronic-MCCB-trip-unit-showing-internal-components-vulnerable-to-EMI.webp\" alt=\"Cutaway diagram of electronic MCCB trip unit showing internal components vulnerable to EMI - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px; font-size: 0.9em;\">S\u01a1 \u0111\u1ed3 c\u1eaft c\u1ee7a b\u1ed9 ph\u1eadn ng\u1eaft MCCB \u0111i\u1ec7n t\u1eed cho th\u1ea5y c\u00e1c th\u00e0nh ph\u1ea7n b\u00ean trong d\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi EMI \u2013 VIOX Electric<\/figcaption><\/figure>\n<h2>Ngu\u1ed3n EMI trong m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p<\/h2>\n<p>C\u00e1c c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p t\u1ea1o ra c\u00e1c tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb m\u1ea1nh t\u1eeb nhi\u1ec1u ngu\u1ed3n ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed3ng th\u1eddi. \u1ed4 \u0111\u0129a t\u1ea7n s\u1ed1 thay \u0111\u1ed5i (VFD) \u0111\u1ea1i di\u1ec7n cho m\u1ed9t trong nh\u1eefng ngu\u1ed3n EMI quan tr\u1ecdng nh\u1ea5t, t\u1ea1o ra ti\u1ebfng \u1ed3n chuy\u1ec3n m\u1ea1ch t\u1ea7n s\u1ed1 cao trong ph\u1ea1m vi t\u1ea7n s\u1ed1 c\u01a1 b\u1ea3n 2-20 kHz v\u1edbi c\u00e1c s\u00f3ng h\u00e0i m\u1edf r\u1ed9ng v\u00e0o ph\u1ea1m vi MHz. C\u00e1c \u1ed5 \u0111\u0129a n\u00e0y s\u1eed d\u1ee5ng b\u00f3ng b\u00e1n d\u1eabn l\u01b0\u1ee1ng c\u1ef1c c\u1ed5ng c\u00e1ch \u0111i\u1ec7n (IGBT) ho\u1eb7c MOSFET chuy\u1ec3n m\u1ea1ch \u1edf t\u1ed1c \u0111\u1ed9 2-20 kHz, t\u1ea1o ra c\u00e1c chuy\u1ec3n \u0111\u1ed5i \u0111i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n d\u1ed1c (dV\/dt v\u00e0 dI\/dt) b\u1ee9c x\u1ea1 n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n t\u1eeb v\u00e0 d\u1eabn nhi\u1ec5u qua c\u00e1p ngu\u1ed3n v\u00e0 c\u00e1p \u0111i\u1ec1u khi\u1ec3n.<\/p>\n<p>Thi\u1ebft b\u1ecb h\u00e0n t\u1ea1o ra c\u00e1c nhi\u1ec5u \u0111i\u1ec7n t\u1eeb \u0111\u1eb7c bi\u1ec7t nghi\u00eam tr\u1ecdng, v\u1edbi m\u00e1y h\u00e0n h\u1ed3 quang t\u1ea1o ra ti\u1ebfng \u1ed3n b\u0103ng th\u00f4ng r\u1ed9ng t\u1eeb DC \u0111\u1ebfn v\u00e0i MHz v\u00e0 m\u00e1y h\u00e0n \u0111i\u1ec7n tr\u1edf t\u1ea1o ra c\u00e1c xung d\u00f2ng \u0111i\u1ec7n cao l\u1eb7p \u0111i l\u1eb7p l\u1ea1i. Thi\u1ebft b\u1ecb t\u1ea7n s\u1ed1 v\u00f4 tuy\u1ebfn (RF) bao g\u1ed3m h\u1ec7 th\u1ed1ng th\u00f4ng tin li\u00ean l\u1ea1c kh\u00f4ng d\u00e2y, \u0111\u1ea7u \u0111\u1ecdc RFID v\u00e0 h\u1ec7 th\u1ed1ng s\u01b0\u1edfi c\u00f4ng nghi\u1ec7p g\u00f3p ph\u1ea7n g\u00e2y nhi\u1ec5u b\u1ee9c x\u1ea1 trong c\u00e1c d\u1ea3i t\u1ea7n c\u1ee5 th\u1ec3. \u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng v\u00e0 d\u1eebng, t\u1ea1o ra c\u00e1c tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb tho\u00e1ng qua v\u00e0 ti\u1ebfng \u1ed3n d\u1eabn tr\u00ean \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n. B\u1ed9 ngu\u1ed3n chuy\u1ec3n m\u1ea1ch, \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong c\u00e1c c\u01a1 s\u1edf hi\u1ec7n \u0111\u1ea1i trong m\u00e1y t\u00ednh, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n v\u00e0 \u0111\u00e8n LED, t\u1ea1o ra ti\u1ebfng \u1ed3n chuy\u1ec3n m\u1ea1ch t\u1ea7n s\u1ed1 cao th\u01b0\u1eddng trong ph\u1ea1m vi t\u1eeb 50 kHz \u0111\u1ebfn 2 MHz.<\/p>\n<p>S\u1ef1 ph\u00f3ng \u0111i\u1ec7n do s\u00e9t \u0111\u00e1nh v\u00e0 t\u0129nh \u0111i\u1ec7n (ESD) t\u1ea1o ra c\u00e1c xung \u0111i\u1ec7n t\u1eeb tho\u00e1ng qua v\u1edbi th\u1eddi gian t\u0103ng c\u1ef1c nhanh v\u00e0 n\u1ed9i dung t\u1ea7n s\u1ed1 r\u1ed9ng. Ngay c\u1ea3 c\u00e1c \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n g\u1ea7n \u0111\u00f3 mang d\u00f2ng \u0111i\u1ec7n cao c\u0169ng c\u00f3 th\u1ec3 g\u00e2y ra nhi\u1ec5u th\u00f4ng qua gh\u00e9p t\u1eeb. Hi\u1ec7u \u1ee9ng t\u00edch l\u0169y c\u1ee7a nhi\u1ec1u ngu\u1ed3n EMI ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed3ng th\u1eddi t\u1ea1o ra m\u1ed9t m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb ph\u1ee9c t\u1ea1p, n\u01a1i c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed ph\u1ea3i duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady.<\/p>\n<h2>C\u01a1 ch\u1ebf gh\u00e9p EMI v\u00e0o c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed<\/h2>\n<p>Nhi\u1ec5u \u0111i\u1ec7n t\u1eeb \u0111\u1ebfn c\u00e1c m\u1ea1ch b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed th\u00f4ng qua b\u1ed1n c\u01a1 ch\u1ebf gh\u00e9p ch\u00ednh, m\u1ed7i c\u01a1 ch\u1ebf c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 y\u00eau c\u1ea7u gi\u1ea3m thi\u1ec3u ri\u00eang bi\u1ec7t. <strong>Gh\u00e9p d\u1eabn<\/strong> x\u1ea3y ra khi nhi\u1ec5u truy\u1ec1n d\u1ecdc theo \u0111\u01b0\u1eddng d\u00e2y cung c\u1ea5p \u0111i\u1ec7n, c\u00e1p \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c d\u00e2y giao ti\u1ebfp tr\u1ef1c ti\u1ebfp v\u00e0o m\u1ea1ch b\u1ed9 ph\u1eadn ng\u1eaft. Ti\u1ebfng \u1ed3n t\u1ea7n s\u1ed1 cao tr\u00ean ngu\u1ed3n \u0111i\u1ec7n c\u00f3 th\u1ec3 b\u1ecf qua c\u00e1c t\u1ee5 l\u1ecdc v\u00e0 \u0111\u1ebfn c\u00e1c m\u1ea1ch t\u01b0\u01a1ng t\u1ef1 v\u00e0 k\u1ef9 thu\u1eadt s\u1ed1 nh\u1ea1y c\u1ea3m, trong khi d\u00f2ng \u0111i\u1ec7n ch\u1ebf \u0111\u1ed9 chung tr\u00ean c\u00e1p c\u00f3 th\u1ec3 gh\u00e9p v\u00e0o \u0111\u01b0\u1eddng d\u1eabn t\u00edn hi\u1ec7u th\u00f4ng qua \u0111i\u1ec7n dung k\u00fd sinh.<\/p>\n<p><strong>Gh\u00e9p b\u1ee9c x\u1ea1<\/strong> x\u1ea3y ra khi s\u00f3ng \u0111i\u1ec7n t\u1eeb lan truy\u1ec1n trong kh\u00f4ng kh\u00ed v\u00e0 t\u1ea1o ra \u0111i\u1ec7n \u00e1p trong c\u00e1c \u0111\u01b0\u1eddng m\u1ea1ch, \u0111\u1ea7u linh ki\u1ec7n ho\u1eb7c v\u00f2ng c\u00e1p b\u00ean trong b\u1ed9 ph\u1eadn ng\u1eaft. Hi\u1ec7u qu\u1ea3 c\u1ee7a gh\u00e9p b\u1ee9c x\u1ea1 ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea7n s\u1ed1, c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng v\u00e0 k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd c\u1ee7a c\u00e1c c\u1ea5u tr\u00fac thu. C\u00e1c \u0111\u01b0\u1eddng m\u1ea1ch ho\u1eb7c v\u00f2ng d\u00e2y c\u00f3 k\u00edch th\u01b0\u1edbc b\u1eb1ng m\u1ed9t ph\u1ea7n \u0111\u00e1ng k\u1ec3 c\u1ee7a b\u01b0\u1edbc s\u00f3ng (th\u01b0\u1eddng l\u00e0 \u03bb\/10 tr\u1edf l\u00ean) tr\u1edf th\u00e0nh \u0103ng-ten hi\u1ec7u qu\u1ea3 \u0111\u1ec3 thu nhi\u1ec5u. V\u00ed d\u1ee5, \u1edf t\u1ea7n s\u1ed1 100 MHz, \u03bb\/10 b\u1eb1ng kho\u1ea3ng 30 cm, c\u00f3 ngh\u0129a l\u00e0 nhi\u1ec1u c\u1ea5u tr\u00fac b\u00ean trong c\u00f3 th\u1ec3 thu EMI b\u1ee9c x\u1ea1 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p><strong>Gh\u00e9p \u0111i\u1ec7n dung<\/strong> (gh\u00e9p \u0111i\u1ec7n tr\u01b0\u1eddng) x\u1ea3y ra khi \u0111i\u1ec7n tr\u01b0\u1eddng thay \u0111\u1ed5i theo th\u1eddi gian t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n d\u1ecbch chuy\u1ec3n trong c\u00e1c d\u00e2y d\u1eabn l\u00e2n c\u1eadn. C\u01a1 ch\u1ebf n\u00e0y quan tr\u1ecdng nh\u1ea5t \u1edf t\u1ea7n s\u1ed1 cao h\u01a1n v\u00e0 khi c\u00e1c m\u1ea1ch tr\u1edf kh\u00e1ng cao n\u1eb1m g\u1ea7n c\u00e1c ngu\u1ed3n \u0111i\u1ec7n \u00e1p thay \u0111\u1ed5i nhanh ch\u00f3ng. \u0110i\u1ec7n dung gh\u00e9p gi\u1eefa ngu\u1ed3n nhi\u1ec5u v\u00e0 m\u1ea1ch b\u1ecb \u1ea3nh h\u01b0\u1edfng c\u00f3 th\u1ec3 ch\u1ec9 l\u00e0 m\u1ed9t v\u00e0i picofarad, nh\u01b0ng \u1edf t\u1ea7n s\u1ed1 cao, \u0111i\u1ec1u n\u00e0y cung c\u1ea5p m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn tr\u1edf kh\u00e1ng th\u1ea5p cho nhi\u1ec5u. <strong>Gh\u00e9p c\u1ea3m \u1ee9ng<\/strong> (gh\u00e9p t\u1eeb tr\u01b0\u1eddng) x\u1ea3y ra khi t\u1eeb tr\u01b0\u1eddng thay \u0111\u1ed5i theo th\u1eddi gian t\u1ea1o ra \u0111i\u1ec7n \u00e1p trong c\u00e1c v\u00f2ng d\u1eabn \u0111i\u1ec7n theo \u0111\u1ecbnh lu\u1eadt Faraday. \u0110i\u1ec7n \u00e1p c\u1ea3m \u1ee9ng t\u1ef7 l\u1ec7 v\u1edbi t\u1ed1c \u0111\u1ed9 thay \u0111\u1ed5i c\u1ee7a t\u1eeb th\u00f4ng, di\u1ec7n t\u00edch v\u00f2ng v\u00e0 s\u1ed1 v\u00f2ng, l\u00e0m cho c\u01a1 ch\u1ebf n\u00e0y \u0111\u1eb7c bi\u1ec7t c\u00f3 v\u1ea5n \u0111\u1ec1 \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ea1ch c\u00f3 di\u1ec7n t\u00edch v\u00f2ng l\u1edbn ho\u1eb7c khi n\u1eb1m g\u1ea7n c\u00e1c d\u00e2y d\u1eabn d\u00f2ng \u0111i\u1ec7n cao.<\/p>\n<p>T\u1ea7m quan tr\u1ecdng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a c\u00e1c c\u01a1 ch\u1ebf gh\u00e9p n\u00e0y kh\u00e1c nhau theo t\u1ea7n s\u1ed1. D\u01b0\u1edbi 10 MHz, gh\u00e9p d\u1eabn v\u00e0 gh\u00e9p c\u1ea3m \u1ee9ng th\u01b0\u1eddng chi\u1ebfm \u01b0u th\u1ebf, trong khi tr\u00ean 30 MHz, gh\u00e9p b\u1ee9c x\u1ea1 v\u00e0 gh\u00e9p \u0111i\u1ec7n dung tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n. Trong th\u1ef1c t\u1ebf, nhi\u1ec1u \u0111\u01b0\u1eddng d\u1eabn gh\u00e9p th\u01b0\u1eddng t\u1ed3n t\u1ea1i \u0111\u1ed3ng th\u1eddi v\u00e0 c\u01a1 ch\u1ebf chi\u1ebfm \u01b0u th\u1ebf c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y thu\u1ed9c v\u00e0o c\u1ea5u h\u00ecnh l\u1eafp \u0111\u1eb7t c\u1ee5 th\u1ec3 v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m ngu\u1ed3n EMI.<\/p>\n<h2>Ph\u00e2n t\u00edch t\u00e1c \u0111\u1ed9ng: EMI \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 ph\u1eadn ng\u1eaft nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<p>C\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft MCCB \u0111i\u1ec7n t\u1eed th\u1ec3 hi\u1ec7n m\u1ed9t s\u1ed1 ch\u1ebf \u0111\u1ed9 l\u1ed7i ri\u00eang bi\u1ec7t khi ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a nhi\u1ec5u \u0111i\u1ec7n t\u1eeb, m\u1ed7i ch\u1ebf \u0111\u1ed9 c\u00f3 c\u00e1c h\u1eadu qu\u1ea3 ho\u1ea1t \u0111\u1ed9ng v\u00e0 h\u1ed3 s\u01a1 r\u1ee7i ro kh\u00e1c nhau. <strong>Phi\u1ec1n to\u00e1i v\u1ea5p ng\u00e3<\/strong> \u0111\u1ea1i di\u1ec7n cho l\u1ed7i do EMI g\u00e2y ra ph\u1ed5 bi\u1ebfn nh\u1ea5t, chi\u1ebfm kho\u1ea3ng 40% s\u1ed1 s\u1ef1 c\u1ed1 \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o. Trong k\u1ecbch b\u1ea3n n\u00e0y, nhi\u1ec5u gh\u00e9p v\u00e0o m\u1ea1ch c\u1ea3m bi\u1ebfn ho\u1eb7c x\u1eed l\u00fd d\u00f2ng \u0111i\u1ec7n, t\u1ea1o ra c\u00e1c t\u00edn hi\u1ec7u sai m\u00e0 b\u1ed9 vi x\u1eed l\u00fd hi\u1ec3u l\u00e0 t\u00ecnh tr\u1ea1ng qu\u00e1 d\u00f2ng. B\u1ed9 ph\u1eadn ng\u1eaft th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 c\u1ee7a n\u00f3 v\u00e0 m\u1edf c\u1ea7u dao ngay c\u1ea3 khi kh\u00f4ng c\u00f3 l\u1ed7i th\u1ef1c t\u1ebf n\u00e0o t\u1ed3n t\u1ea1i. \u0110i\u1ec1u n\u00e0y g\u00e2y ra c\u00e1c s\u1ef1 c\u1ed1 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng b\u1ea5t ng\u1edd, t\u1ed5n th\u1ea5t s\u1ea3n xu\u1ea5t v\u00e0 l\u00e0m x\u00f3i m\u00f2n ni\u1ec1m tin v\u00e0o h\u1ec7 th\u1ed1ng b\u1ea3o v\u1ec7.<\/p>\n<p><strong>\u0110\u1ecdc sai v\u00e0 l\u1ed7i \u0111o l\u01b0\u1eddng<\/strong> x\u1ea3y ra khi EMI l\u00e0m h\u1ecfng qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng t\u1ef1 sang s\u1ed1 ho\u1eb7c g\u00e2y nhi\u1ec5u cho c\u00e1c m\u1ea1ch c\u1ea3m bi\u1ebfn d\u00f2ng \u0111i\u1ec7n. B\u1ed9 ph\u1eadn ng\u1eaft c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb c\u00e1c gi\u00e1 tr\u1ecb d\u00f2ng \u0111i\u1ec7n kh\u00f4ng ch\u00ednh x\u00e1c, ghi d\u1eef li\u1ec7u sai ho\u1eb7c \u0111\u01b0a ra c\u00e1c quy\u1ebft \u0111\u1ecbnh b\u1ea3o v\u1ec7 d\u1ef1a tr\u00ean c\u00e1c ph\u00e9p \u0111o b\u1ecb h\u1ecfng. M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 kh\u00f4ng g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng ng\u1eaft ngay l\u1eadp t\u1ee9c, nh\u01b0ng n\u00f3 l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a vi\u1ec7c ph\u1ed1i h\u1ee3p b\u1ea3o v\u1ec7 v\u00e0 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c kh\u00f4ng ng\u1eaft trong c\u00e1c l\u1ed7i th\u1ef1c t\u1ebf ho\u1eb7c ng\u1eaft ch\u1eadm tr\u1ec5 cho ph\u00e9p thi\u1ebft b\u1ecb b\u1ecb h\u01b0 h\u1ecfng. C\u00e1c nghi\u00ean c\u1ee9u ch\u1ec9 ra r\u1eb1ng ch\u1ebf \u0111\u1ed9 l\u1ed7i n\u00e0y chi\u1ebfm kho\u1ea3ng 35% c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn EMI.<\/p>\n<p><strong>Kh\u00f3a ho\u1eb7c tr\u1ee5c tr\u1eb7c ho\u00e0n to\u00e0n<\/strong> \u0111\u1ea1i di\u1ec7n cho t\u00e1c \u0111\u1ed9ng nghi\u00eam tr\u1ecdng nh\u1ea5t, trong \u0111\u00f3 nhi\u1ec5u \u0111i\u1ec7n t\u1eeb l\u00e0m gi\u00e1n \u0111o\u1ea1n ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 vi x\u1eed l\u00fd \u0111\u1ebfn m\u1ee9c b\u1ed9 ph\u1eadn ng\u1eaft kh\u00f4ng ph\u1ea3n h\u1ed3i. B\u1ed9 x\u1eed l\u00fd c\u00f3 th\u1ec3 chuy\u1ec3n sang tr\u1ea1ng th\u00e1i kh\u00f4ng x\u00e1c \u0111\u1ecbnh, treo trong m\u1ed9t v\u00f2ng l\u1eb7p v\u00f4 t\u1eadn ho\u1eb7c b\u1ecb h\u1ecfng b\u1ed9 nh\u1edb. Trong \u0111i\u1ec1u ki\u1ec7n n\u00e0y, b\u1ed9 ph\u1eadn ng\u1eaft c\u00f3 th\u1ec3 kh\u00f4ng cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 trong m\u1ed9t l\u1ed7i th\u1ef1c t\u1ebf\u2014m\u1ed9t t\u00ecnh hu\u1ed1ng nguy hi\u1ec3m vi ph\u1ea1m y\u00eau c\u1ea7u c\u01a1 b\u1ea3n v\u1ec1 ho\u1ea1t \u0111\u1ed9ng an to\u00e0n khi c\u00f3 l\u1ed7i. Ch\u1ebf \u0111\u1ed9 l\u1ed7i n\u00e0y chi\u1ebfm kho\u1ea3ng 25% s\u1ed1 s\u1ef1 c\u1ed1 EMI \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o v\u00e0 g\u00e2y ra r\u1ee7i ro an to\u00e0n l\u1edbn nh\u1ea5t.<\/p>\n<p><strong>L\u1ed7i giao ti\u1ebfp<\/strong> \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c b\u1ed9 ph\u1eadn ng\u1eaft c\u00f3 kh\u1ea3 n\u0103ng giao ti\u1ebfp k\u1ef9 thu\u1eadt s\u1ed1 (Modbus, Profibus, Ethernet\/IP, v.v.). EMI c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng c\u00e1c g\u00f3i d\u1eef li\u1ec7u, g\u00e2y ra th\u1eddi gian ch\u1edd giao ti\u1ebfp ho\u1eb7c v\u00f4 hi\u1ec7u h\u00f3a ho\u00e0n to\u00e0n giao di\u1ec7n giao ti\u1ebfp. M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7, nh\u01b0ng n\u00f3 ng\u0103n c\u1ea3n vi\u1ec7c gi\u00e1m s\u00e1t t\u1eeb xa, ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 kh\u00e1c v\u00e0 t\u00edch h\u1ee3p v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u00f2a nh\u00e0. T\u1ea7n su\u1ea5t v\u00e0 m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng c\u1ee7a nh\u1eefng t\u00e1c \u0111\u1ed9ng n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1 bao g\u1ed3m c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng, n\u1ed9i dung t\u1ea7n s\u1ed1, hi\u1ec7u qu\u1ea3 \u0111\u01b0\u1eddng d\u1eabn gh\u00e9p v\u00e0 thi\u1ebft k\u1ebf kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1ed1n c\u00f3 c\u1ee7a b\u1ed9 ph\u1eadn ng\u1eaft c\u1ee5 th\u1ec3.<\/p>\n<h2>So s\u00e1nh: B\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed so v\u1edbi t\u1eeb nhi\u1ec7t<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>\u0110\u1eb7c tr\u01b0ng<\/th>\n<th>\u0110i\u1ec7n T\u1eed \u0110\u01a1n V\u1ecb Chuy\u1ebfn \u0110i<\/th>\n<th>B\u1ed9 ph\u1eadn ng\u1eaft t\u1eeb nhi\u1ec7t<\/th>\n<th>\u01afu \u0111i\u1ec3m EMI<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>T\u00ednh d\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng c\u1ee7a EMI<\/strong><\/td>\n<td>Cao (m\u1ea1ch vi x\u1eed l\u00fd nh\u1ea1y c\u1ea3m)<\/td>\n<td>Th\u1ea5p (c\u00e1c th\u00e0nh ph\u1ea7n c\u01a1 h\u1ecdc th\u1ee5 \u0111\u1ed9ng)<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>H\u00e0nh Nguy\u00ean T\u1eafc<\/strong><\/td>\n<td>X\u1eed l\u00fd t\u00edn hi\u1ec7u k\u1ef9 thu\u1eadt s\u1ed1, chuy\u1ec3n \u0111\u1ed5i ADC<\/td>\n<td>C\u00e1c thu\u1ed9c t\u00ednh v\u1eadt l\u00fd (nhi\u1ec7t, l\u1ef1c t\u1eeb)<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>M\u1ee9c \u0111\u1ed9 mi\u1ec5n nhi\u1ec5m \u0111i\u1ec3n h\u00ecnh<\/strong><\/td>\n<td>10 V\/m (t\u1ed1i thi\u1ec3u theo IEC 60947-2)<\/td>\n<td>V\u1ed1n d\u0129 mi\u1ec5n nhi\u1ec5m v\u1edbi h\u1ea7u h\u1ebft EMI<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>Ph\u1ea1m vi t\u1ea7n s\u1ed1 d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng<\/strong><\/td>\n<td>150 kHz \u2013 1 GHz<\/td>\n<td>Kh\u1ea3 n\u0103ng d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng t\u1ed1i thi\u1ec3u<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>R\u1ee7i ro ng\u1eaft m\u1ea1ch do nhi\u1ec5u<\/strong><\/td>\n<td>V\u1eeba ph\u1ea3i \u0111\u1ebfn cao trong m\u00f4i tr\u01b0\u1eddng EMI<\/td>\n<td>R\u1ea5t th\u1ea5p<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 ch\u00ednh x\u00e1c b\u1ea3o v\u1ec7<\/strong><\/td>\n<td>\u00b11-2% c\u00e0i \u0111\u1eb7t<\/td>\n<td>\u00b110-20% c\u00e0i \u0111\u1eb7t<\/td>\n<td>\u0110i\u1ec7n t\u1eed<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh<\/strong><\/td>\n<td>C\u00e0i \u0111\u1eb7t c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh ho\u00e0n to\u00e0n<\/td>\n<td>\u0110i\u1ec1u ch\u1ec9nh c\u1ed1 \u0111\u1ecbnh ho\u1eb7c gi\u1edbi h\u1ea1n<\/td>\n<td>\u0110i\u1ec7n t\u1eed<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng giao ti\u1ebfp<\/strong><\/td>\n<td>C\u00f3 s\u1eb5n c\u00e1c giao th\u1ee9c k\u1ef9 thu\u1eadt s\u1ed1<\/td>\n<td>Kh\u00f4ng c\u00f3<\/td>\n<td>\u0110i\u1ec7n t\u1eed<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng m\u00f4i tr\u01b0\u1eddng<\/strong><\/td>\n<td>Y\u00eau c\u1ea7u gi\u1ea3m thi\u1ec3u EMI trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t<\/td>\n<td>Ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady m\u00e0 kh\u00f4ng c\u1ea7n c\u00e1c bi\u1ec7n ph\u00e1p \u0111\u1eb7c bi\u1ec7t<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>Chi ph\u00ed<\/strong><\/td>\n<td>Ban \u0111\u1ea7u cao h\u01a1n chi ph\u00ed<\/td>\n<td>Chi ph\u00ed ban \u0111\u1ea7u th\u1ea5p h\u01a1n<\/td>\n<td>Nhi\u1ec7t-T\u1eeb<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3o tr\u00ec<\/strong><\/td>\n<td>C\u00f3 th\u1ec3 c\u1eadp nh\u1eadt ch\u01b0\u01a1ng tr\u00ecnh c\u01a1 s\u1edf, t\u1ef1 ch\u1ea9n \u0111o\u00e1n<\/td>\n<td>Kh\u00f4ng c\u1ea7n b\u1ea3o tr\u00ec ph\u1ea7n m\u1ec1m<\/td>\n<td>H\u1ed7n h\u1ee3p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>So s\u00e1nh n\u00e0y cho th\u1ea5y s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i c\u01a1 b\u1ea3n gi\u1eefa ch\u1ee9c n\u0103ng n\u00e2ng cao v\u00e0 \u0111\u1ed9 b\u1ec1n EMI. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed cung c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c, t\u00ednh linh ho\u1ea1t v\u00e0 kh\u1ea3 n\u0103ng t\u00edch h\u1ee3p v\u01b0\u1ee3t tr\u1ed9i, nh\u01b0ng \u0111\u00f2i h\u1ecfi \u1ee9ng d\u1ee5ng c\u1ea9n th\u1eadn v\u00e0 gi\u1ea3m thi\u1ec3u EMI trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb kh\u1eafc nghi\u1ec7t. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch t\u1eeb nhi\u1ec7t cung c\u1ea5p kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1ed1n c\u00f3 \u0111\u1ed1i v\u1edbi nhi\u1ec5u \u0111i\u1ec7n t\u1eeb, nh\u01b0ng l\u1ea1i thi\u1ebfu c\u00e1c t\u00ednh n\u0103ng n\u00e2ng cao ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i. L\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3, m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb v\u00e0 t\u00ednh kh\u1ea3 thi c\u1ee7a vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI hi\u1ec7u qu\u1ea3.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/EMI-coupling-mechanisms-affecting-electronic-MCCB-trip-units.webp\" alt=\"EMI coupling mechanisms affecting electronic MCCB trip units - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px; font-size: 0.9em;\">C\u01a1 ch\u1ebf gh\u00e9p n\u1ed1i EMI \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn b\u1ed9 ng\u1eaft m\u1ea1ch MCCB \u0111i\u1ec7n t\u1eed \u2013 VIOX Electric<\/figcaption><\/figure>\n<h2>Y\u00eau c\u1ea7u EMC IEC 60947-2 \u0111\u1ed1i v\u1edbi MCCB<\/h2>\n<p>Ti\u00eau chu\u1ea9n IEC 60947-2 c\u1ee7a \u1ee6y ban K\u1ef9 thu\u1eadt \u0110i\u1ec7n Qu\u1ed1c t\u1ebf thi\u1ebft l\u1eadp c\u00e1c y\u00eau c\u1ea7u t\u01b0\u01a1ng th\u00edch \u0111i\u1ec7n t\u1eeb to\u00e0n di\u1ec7n cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 th\u1ebf, bao g\u1ed3m MCCB c\u00f3 b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed. C\u00e1c y\u00eau c\u1ea7u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb c\u00f4ng nghi\u1ec7p \u0111i\u1ec3n h\u00ecnh m\u00e0 kh\u00f4ng t\u1ea1o ra nhi\u1ec5u qu\u00e1 m\u1ee9c \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c. Ti\u00eau chu\u1ea9n n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u1ea3 ph\u00e1t x\u1ea1 (nhi\u1ec5u do thi\u1ebft b\u1ecb t\u1ea1o ra) v\u00e0 kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m (kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i nhi\u1ec5u b\u00ean ngo\u00e0i).<\/p>\n<p><strong>Y\u00eau c\u1ea7u v\u1ec1 ph\u00e1t x\u1ea1<\/strong> gi\u1edbi h\u1ea1n nhi\u1ec5u \u0111i\u1ec7n t\u1eeb m\u00e0 MCCB c\u00f3 th\u1ec3 t\u1ea1o ra trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. Ph\u00e1t x\u1ea1 d\u1eabn \u0111\u01b0\u1ee3c \u0111o tr\u00ean c\u00e1c \u0111\u1ea7u n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n trong d\u1ea3i t\u1ea7n t\u1eeb 150 kHz \u0111\u1ebfn 30 MHz, v\u1edbi c\u00e1c gi\u1edbi h\u1ea1n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo CISPR 11 Nh\u00f3m 1 Lo\u1ea1i A (m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p). Ph\u00e1t x\u1ea1 b\u1ee9c x\u1ea1 \u0111\u01b0\u1ee3c \u0111o t\u1eeb 30 MHz \u0111\u1ebfn 1 GHz \u1edf kho\u1ea3ng c\u00e1ch 10 m\u00e9t, \u0111\u1ea3m b\u1ea3o r\u1eb1ng thi\u1ebft b\u1ecb kh\u00f4ng g\u00e2y nhi\u1ec5u cho th\u00f4ng tin li\u00ean l\u1ea1c v\u00f4 tuy\u1ebfn ho\u1eb7c c\u00e1c thi\u1ebft b\u1ecb nh\u1ea1y c\u1ea3m kh\u00e1c. C\u00e1c gi\u1edbi h\u1ea1n n\u00e0y th\u01b0\u1eddng \u00edt nghi\u00eam ng\u1eb7t h\u01a1n \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p so v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng d\u00e2n d\u1ee5ng, ghi nh\u1eadn c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb kh\u00e1c nhau.<\/p>\n<p><strong>Mi\u1ec5n d\u1ecbch y\u00eau c\u1ea7u<\/strong> ch\u1ec9 \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 nhi\u1ec5u \u0111i\u1ec7n t\u1eeb t\u1ed1i thi\u1ec3u m\u00e0 MCCB ph\u1ea3i ch\u1ecbu \u0111\u01b0\u1ee3c m\u00e0 kh\u00f4ng b\u1ecb tr\u1ee5c tr\u1eb7c. C\u00e1c th\u1eed nghi\u1ec7m kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m ch\u00ednh bao g\u1ed3m kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb b\u1ee9c x\u1ea1 (IEC 61000-4-3) y\u00eau c\u1ea7u ho\u1ea1t \u0111\u1ed9ng m\u00e0 kh\u00f4ng b\u1ecb suy gi\u1ea3m \u1edf c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng 10 V\/m trong d\u1ea3i t\u1ea7n t\u1eeb 80 MHz \u0111\u1ebfn 1 GHz, v\u1edbi \u0111i\u1ec1u ch\u1ebf bi\u00ean \u0111\u1ed9 \u1edf 1 kHz v\u00e0 80%. Kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m tho\u00e1ng qua\/b\u00f9ng n\u1ed5 nhanh v\u1ec1 \u0111i\u1ec7n (IEC 61000-4-4) ki\u1ec3m tra kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch nhanh l\u1eb7p \u0111i l\u1eb7p l\u1ea1i tr\u00ean \u0111\u01b0\u1eddng d\u00e2y ngu\u1ed3n v\u00e0 \u0111\u01b0\u1eddng \u0111i\u1ec1u khi\u1ec3n, m\u00f4 ph\u1ecfng c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch t\u1eeb t\u1ea3i c\u1ea3m \u1ee9ng v\u00e0 ti\u1ebfp \u0111i\u1ec3m r\u01a1le. Kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m xung (IEC 61000-4-5) \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch n\u0103ng l\u01b0\u1ee3ng cao do s\u00e9t \u0111\u00e1nh v\u00e0 c\u00e1c thao t\u00e1c chuy\u1ec3n m\u1ea1ch trong h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i \u0111i\u1ec7n.<\/p>\n<p>C\u00e1c nhi\u1ec5u d\u1eabn do tr\u01b0\u1eddng t\u1ea7n s\u1ed1 v\u00f4 tuy\u1ebfn g\u00e2y ra (IEC 61000-4-6) ki\u1ec3m tra kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m \u0111\u1ed1i v\u1edbi nhi\u1ec5u RF \u0111\u01b0\u1ee3c gh\u00e9p n\u1ed1i tr\u00ean c\u00e1p trong d\u1ea3i t\u1ea7n t\u1eeb 150 kHz \u0111\u1ebfn 80 MHz \u1edf m\u1ee9c 10V. S\u1ee5t \u00e1p, gi\u00e1n \u0111o\u1ea1n ng\u1eafn v\u00e0 bi\u1ebfn \u0111\u1ed9ng (IEC 61000-4-11) \u0111\u1ea3m b\u1ea3o b\u1ed9 ng\u1eaft m\u1ea1ch duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c ph\u1ee5c h\u1ed3i \u0111\u00fang c\u00e1ch trong qu\u00e1 tr\u00ecnh nhi\u1ec5u lo\u1ea1n ngu\u1ed3n \u0111i\u1ec7n. Kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m ph\u00f3ng t\u0129nh \u0111i\u1ec7n (IEC 61000-4-2) x\u00e1c minh kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u00e1c s\u1ef1 ki\u1ec7n ESD l\u00ean \u0111\u1ebfn x\u1ea3 ti\u1ebfp x\u00fac \u00b18 kV v\u00e0 x\u1ea3 kh\u00ed \u00b115 kV. C\u00e1c y\u00eau c\u1ea7u ki\u1ec3m tra to\u00e0n di\u1ec7n n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng MCCB c\u00f3 b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady trong m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p v\u1edbi nhi\u1ec5u \u0111i\u1ec7n t\u1eeb \u0111\u00e1ng k\u1ec3.<\/p>\n<h2>C\u00e1c chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u EMI \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh<\/h2>\n<p>Gi\u1ea3m thi\u1ec3u EMI hi\u1ec7u qu\u1ea3 cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch MCCB \u0111i\u1ec7n t\u1eed \u0111\u00f2i h\u1ecfi m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn c\u00f3 h\u1ec7 th\u1ed1ng gi\u1ea3i quy\u1ebft nhi\u1ec5u t\u1ea1i ngu\u1ed3n, \u0111\u01b0\u1eddng d\u1eabn gh\u00e9p n\u1ed1i v\u00e0 b\u1ed9 thu. <strong>Th\u1ef1c h\u00e0nh c\u00e0i \u0111\u1eb7t \u0111\u00fang c\u00e1ch<\/strong> t\u1ea1o th\u00e0nh n\u1ec1n t\u1ea3ng c\u1ee7a vi\u1ec7c gi\u1ea3m thi\u1ec3u EMI. Duy tr\u00ec kho\u1ea3ng c\u00e1ch v\u1eadt l\u00fd gi\u1eefa MCCB v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c ngu\u1ed3n EMI \u0111\u00e3 bi\u1ebft (VFD, thi\u1ebft b\u1ecb h\u00e0n, m\u00e1y ph\u00e1t RF) l\u00e0m gi\u1ea3m c\u1ea3 b\u1ee9c x\u1ea1 v\u00e0 gh\u00e9p n\u1ed1i c\u1ea3m \u1ee9ng. N\u00ean duy tr\u00ec kho\u1ea3ng c\u00e1ch t\u1ed1i thi\u1ec3u 30 cm t\u1eeb VFD c\u00f4ng su\u1ea5t cao v\u00e0 50 cm t\u1eeb thi\u1ebft b\u1ecb h\u00e0n, v\u1edbi kho\u1ea3ng c\u00e1ch l\u1edbn h\u01a1n cung c\u1ea5p th\u00eam bi\u00ean \u0111\u1ed9. L\u1eafp \u0111\u1eb7t MCCB trong v\u1ecf kim lo\u1ea1i c\u00f3 n\u1ed1i \u0111\u1ea5t th\u00edch h\u1ee3p gi\u00fap b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i EMI b\u1ee9c x\u1ea1, v\u1edbi v\u1ecf ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t l\u1ed3ng Faraday l\u00e0m suy gi\u1ea3m tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb.<\/p>\n<p><strong>\u0110\u1ecbnh tuy\u1ebfn v\u00e0 che ch\u1eafn c\u00e1p<\/strong> \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn gh\u00e9p n\u1ed1i EMI. C\u00e1p ngu\u1ed3n v\u00e0 c\u00e1p \u0111i\u1ec1u khi\u1ec3n n\u00ean \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn c\u00e1ch xa c\u00e1c ngu\u1ed3n EMI, tr\u00e1nh ch\u1ea1y song song v\u1edbi c\u00e1p \u0111\u1ea7u ra VFD, d\u00e2y d\u1eabn \u0111\u1ed9ng c\u01a1 v\u00e0 c\u00e1c d\u00e2y d\u1eabn c\u00f3 \u0111\u1ed9 \u1ed3n cao kh\u00e1c. Khi kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi vi\u1ec7c \u0111\u1ecbnh tuy\u1ebfn song song, vi\u1ec7c duy tr\u00ec kho\u1ea3ng c\u00e1ch \u00edt nh\u1ea5t 30 cm v\u00e0 s\u1eed d\u1ee5ng c\u00e1c \u0111\u01b0\u1eddng c\u1eaft vu\u00f4ng g\u00f3c s\u1ebd gi\u1ea3m thi\u1ec3u gh\u00e9p n\u1ed1i c\u1ea3m \u1ee9ng. C\u00e1p \u0111\u01b0\u1ee3c che ch\u1eafn cho c\u00e1c k\u1ebft n\u1ed1i li\u00ean l\u1ea1c v\u00e0 \u0111i\u1ec1u khi\u1ec3n cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u1ea3 b\u1ee9c x\u1ea1 v\u00e0 gh\u00e9p n\u1ed1i \u0111i\u1ec7n dung, v\u1edbi l\u1edbp che ch\u1eafn \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t \u1edf m\u1ed9t \u0111\u1ea7u (cho c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea7n s\u1ed1 th\u1ea5p) ho\u1eb7c c\u1ea3 hai \u0111\u1ea7u (cho c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea7n s\u1ed1 cao) t\u00f9y thu\u1ed9c v\u00e0o t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3. S\u1eed d\u1ee5ng d\u00e2y d\u1eabn xo\u1eafn \u0111\u00f4i cho h\u1ec7 th\u1ed1ng d\u00e2y t\u00edn hi\u1ec7u v\u00e0 \u0111i\u1ec1u khi\u1ec3n l\u00e0m gi\u1ea3m di\u1ec7n t\u00edch v\u00f2ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m \u0111\u1ed1i v\u1edbi gh\u00e9p n\u1ed1i tr\u01b0\u1eddng t\u1eeb.<\/p>\n<p><strong>L\u1ecdc v\u00e0 tri\u1ec7t ti\u00eau<\/strong> c\u00e1c th\u00e0nh ph\u1ea7n ch\u1eb7n nhi\u1ec5u tr\u01b0\u1edbc khi n\u00f3 \u0111\u1ebfn c\u00e1c m\u1ea1ch nh\u1ea1y c\u1ea3m. L\u1eafp \u0111\u1eb7t b\u1ed9 l\u1ecdc \u0111\u01b0\u1eddng d\u00e2y tr\u00ean ngu\u1ed3n \u0111i\u1ec7n cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed l\u00e0m suy gi\u1ea3m EMI d\u1eabn, v\u1edbi l\u1ef1a ch\u1ecdn b\u1ed9 l\u1ecdc d\u1ef1a tr\u00ean ph\u1ed5 t\u1ea7n s\u1ed1 c\u1ee7a nhi\u1ec5u. L\u00f5i ho\u1eb7c h\u1ea1t ferit tr\u00ean c\u00e1p g\u1ea7n v\u1ecf b\u1ed9 ng\u1eaft m\u1ea1ch tri\u1ec7t ti\u00eau d\u00f2ng \u0111i\u1ec7n ch\u1ebf \u0111\u1ed9 chung t\u1ea7n s\u1ed1 cao m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c t\u00edn hi\u1ec7u mong mu\u1ed1n. B\u1ed9 tri\u1ec7t ti\u00eau \u0111i\u1ec7n \u00e1p tho\u00e1ng qua (TVS) ho\u1eb7c varistor oxit kim lo\u1ea1i (MOV) tr\u00ean \u0111\u01b0\u1eddng d\u00e2y ngu\u1ed3n v\u00e0 \u0111\u01b0\u1eddng \u0111i\u1ec1u khi\u1ec3n k\u1eb9p c\u00e1c gai \u0111i\u1ec7n \u00e1p v\u00e0 b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u00e1c s\u1ef1 ki\u1ec7n xung. RC snubber tr\u00ean c\u00e1c t\u1ea3i c\u1ea3m \u1ee9ng (cu\u1ed9n d\u00e2y r\u01a1le, cu\u1ed9n d\u00e2y contactor) l\u00e0m gi\u1ea3m bi\u00ean \u0111\u1ed9 c\u1ee7a c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch t\u1ea1i ngu\u1ed3n.<\/p>\n<p><strong>N\u1ed1i \u0111\u1ea5t v\u00e0 li\u00ean k\u1ebft<\/strong> th\u1ef1c h\u00e0nh \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c t\u1ea5m ch\u1eafn, v\u1ecf v\u00e0 khung thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i \u0111\u00fang c\u00e1ch \u0111\u1ec3 thi\u1ebft l\u1eadp \u0111\u01b0\u1eddng d\u1eabn tr\u1edf kh\u00e1ng th\u1ea5p cho d\u00f2ng \u0111i\u1ec7n nhi\u1ec5u. K\u1ebft n\u1ed1i \u0111\u1ea5t m\u1ed9t \u0111i\u1ec3m cho v\u1ecf MCCB v\u1edbi h\u1ec7 th\u1ed1ng \u0111\u1ea5t ch\u00ednh c\u1ee7a c\u01a1 s\u1edf ng\u0103n ng\u1eeba v\u00f2ng l\u1eb7p \u0111\u1ea5t \u0111\u1ed3ng th\u1eddi cung c\u1ea5p kh\u1ea3 n\u0103ng che ch\u1eafn hi\u1ec7u qu\u1ea3. Li\u00ean k\u1ebft t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 ph\u1eadn kim lo\u1ea1i b\u00ean trong v\u1ecf t\u1ea1o ra m\u1ed9t v\u00f9ng \u0111\u1eb3ng th\u1ebf gi\u00fap gi\u1ea3m thi\u1ec3u s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 \u0111i\u1ec7n \u00e1p c\u00f3 th\u1ec3 g\u00e2y ra d\u00f2ng \u0111i\u1ec7n nhi\u1ec5u. S\u1eed d\u1ee5ng c\u1ea5u tr\u00fac li\u00ean k\u1ebft n\u1ed1i \u0111\u1ea5t h\u00ecnh sao cho c\u00e1c m\u1ea1ch nh\u1ea1y c\u1ea3m t\u00e1ch bi\u1ec7t c\u00e1c \u0111\u01b0\u1eddng tr\u1ea3 v\u1ec1 \u0111\u1ea5t d\u00f2ng \u0111i\u1ec7n cao v\u00e0 d\u00f2ng \u0111i\u1ec7n th\u1ea5p, ng\u0103n ng\u1eeba gh\u00e9p n\u1ed1i nhi\u1ec5u th\u00f4ng qua tr\u1edf kh\u00e1ng \u0111\u1ea5t chung.<\/p>\n<p><strong>L\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m<\/strong> c\u00e1c c\u00e2n nh\u1eafc bao g\u1ed3m vi\u1ec7c ch\u1ecdn MCCB v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed v\u01b0\u1ee3t qu\u00e1 c\u00e1c y\u00eau c\u1ea7u mi\u1ec5n nhi\u1ec5m t\u1ed1i thi\u1ec3u IEC 60947-2 khi ho\u1ea1t \u0111\u1ed9ng trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb \u0111\u1eb7c bi\u1ec7t kh\u1eafc nghi\u1ec7t. M\u1ed9t s\u1ed1 nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p c\u00e1c phi\u00ean b\u1ea3n mi\u1ec5n nhi\u1ec5m n\u00e2ng cao \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho c\u00e1c \u1ee9ng d\u1ee5ng VFD ho\u1eb7c m\u00f4i tr\u01b0\u1eddng h\u00e0n. X\u00e1c minh r\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra theo c\u00e1c ti\u00eau chu\u1ea9n mi\u1ec5n nhi\u1ec5m c\u00f3 li\u00ean quan v\u00e0 xem x\u00e9t c\u00e1c b\u00e1o c\u00e1o th\u1eed nghi\u1ec7m mang l\u1ea1i s\u1ef1 tin t\u01b0\u1edfng v\u00e0o hi\u1ec7u su\u1ea5t EMI. Trong m\u00f4i tr\u01b0\u1eddng c\u1ef1c k\u1ef3 kh\u1eafc nghi\u1ec7t, n\u01a1i kh\u00f3 gi\u1ea3m thi\u1ec3u hi\u1ec7u qu\u1ea3, b\u1ed9 ng\u1eaft m\u1ea1ch t\u1eeb nhi\u1ec7t c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00e1ng tin c\u1eady h\u01a1n m\u1eb7c d\u00f9 ch\u1ee9c n\u0103ng c\u1ee7a ch\u00fang b\u1ecb gi\u1ea3m.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Proper-EMI-mitigation-installation-for-electronic-MCCB-trip-units.webp\" alt=\"Proper EMI mitigation installation for electronic MCCB trip units - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px; font-size: 0.9em;\">C\u00e0i \u0111\u1eb7t gi\u1ea3m thi\u1ec3u EMI \u0111\u00fang c\u00e1ch cho b\u1ed9 ng\u1eaft m\u1ea1ch MCCB \u0111i\u1ec7n t\u1eed \u2013 VIOX Electric<\/figcaption><\/figure>\n<h2>Ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra v\u00e0 x\u00e1c minh<\/h2>\n<p>X\u00e1c th\u1ef1c kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m EMI v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c v\u1ea5n \u0111\u1ec1 ti\u1ec1m \u1ea9n \u0111\u00f2i h\u1ecfi ph\u1ea3i ki\u1ec3m tra c\u00f3 h\u1ec7 th\u1ed1ng \u1edf c\u1ea3 c\u1ea5p \u0111\u1ed9 th\u00e0nh ph\u1ea7n v\u00e0 h\u1ec7 th\u1ed1ng. <strong>Ki\u1ec3m tra tr\u01b0\u1edbc khi c\u00e0i \u0111\u1eb7t<\/strong> trong m\u1ed9t m\u00f4i tr\u01b0\u1eddng \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t cho ph\u00e9p x\u00e1c minh kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch tr\u01b0\u1edbc khi tri\u1ec3n khai. Ki\u1ec3m tra kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m b\u1ee9c x\u1ea1 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u RF v\u00e0 \u0103ng-ten \u0111\u01b0\u1ee3c hi\u1ec7u ch\u1ec9nh s\u1ebd ph\u01a1i b\u00e0y b\u1ed9 ng\u1eaft m\u1ea1ch v\u1edbi tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb \u1edf c\u00e1c t\u1ea7n s\u1ed1 v\u00e0 bi\u00ean \u0111\u1ed9 kh\u00e1c nhau, theo d\u00f5i s\u1ef1 c\u1ed1 ho\u1eb7c v\u1ea5p ng\u00e3 g\u00e2y phi\u1ec1n nhi\u1ec5u. Ki\u1ec3m tra kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m d\u1eabn truy\u1ec1n b\u1eb1ng c\u00e1ch \u0111\u01b0a t\u00edn hi\u1ec7u RF l\u00ean c\u00e1p ngu\u1ed3n v\u00e0 c\u00e1p \u0111i\u1ec1u khi\u1ec3n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ea1ng gh\u00e9p n\u1ed1i\/kh\u1eed gh\u00e9p n\u1ed1i (CDN) ho\u1eb7c \u0111\u1ea7u d\u00f2 ti\u00eam d\u00f2ng \u0111i\u1ec7n. Ki\u1ec3m tra kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m b\u00f9ng n\u1ed5 \u00e1p d\u1ee5ng c\u00e1c \u0111\u1ee3t tho\u00e1ng qua nhanh m\u00f4 ph\u1ecfng c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch \u0111\u1ec3 x\u00e1c minh ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang c\u00e1ch. C\u00e1c th\u1eed nghi\u1ec7m n\u00e0y n\u00ean t\u00e1i t\u1ea1o m\u00f4i tr\u01b0\u1eddng EMI c\u1ee5 th\u1ec3 d\u1ef1 ki\u1ebfn trong qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t, bao g\u1ed3m n\u1ed9i dung t\u1ea7n s\u1ed1, bi\u00ean \u0111\u1ed9 v\u00e0 \u0111\u1eb7c t\u00ednh \u0111i\u1ec1u ch\u1ebf.<\/p>\n<p><strong>Ki\u1ec3m tra t\u1ea1i ch\u1ed7<\/strong> sau khi c\u00e0i \u0111\u1eb7t s\u1ebd x\u00e1c th\u1ef1c t\u00ednh hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u trong m\u00f4i tr\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng th\u1ef1c t\u1ebf. \u0110o c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb b\u1eb1ng m\u00e1y \u0111o c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng b\u0103ng th\u00f4ng r\u1ed9ng ho\u1eb7c m\u00e1y ph\u00e2n t\u00edch ph\u1ed5 x\u00e1c \u0111\u1ecbnh bi\u00ean \u0111\u1ed9 v\u00e0 n\u1ed9i dung t\u1ea7n s\u1ed1 c\u1ee7a EMI xung quanh t\u1ea1i v\u1ecb tr\u00ed MCCB. \u0110o ti\u1ebfng \u1ed3n d\u1eabn tr\u00ean c\u00e1p ngu\u1ed3n v\u00e0 c\u00e1p \u0111i\u1ec1u khi\u1ec3n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng \u0111\u1ea7u d\u00f2 d\u00f2ng \u0111i\u1ec7n v\u00e0 m\u00e1y hi\u1ec7n s\u00f3ng cho th\u1ea5y nhi\u1ec5u th\u1ef1c s\u1ef1 \u0111\u1ebfn b\u1ed9 ng\u1eaft m\u1ea1ch. Ki\u1ec3m tra ch\u1ee9c n\u0103ng trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh c\u00e1c ngu\u1ed3n EMI l\u00e2n c\u1eadn (kh\u1edfi \u0111\u1ed9ng VFD, v\u1eadn h\u00e0nh thi\u1ebft b\u1ecb h\u00e0n, truy\u1ec1n tr\u00ean h\u1ec7 th\u1ed1ng v\u00f4 tuy\u1ebfn) x\u00e1c minh r\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng m\u00e0 kh\u00f4ng b\u1ecb v\u1ea5p ng\u00e3 g\u00e2y phi\u1ec1n nhi\u1ec5u ho\u1eb7c l\u1ed7i \u0111o.<\/p>\n<p><strong>Gi\u00e1m s\u00e1t v\u00e0 ch\u1ea9n \u0111o\u00e1n<\/strong> cung c\u1ea5p x\u00e1c minh li\u00ean t\u1ee5c v\u1ec1 kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m EMI v\u00e0 c\u1ea3nh b\u00e1o s\u1edbm v\u1ec1 c\u00e1c v\u1ea5n \u0111\u1ec1 ti\u1ec1m \u1ea9n. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 kh\u1ea3 n\u0103ng ghi nh\u1eadt k\u00fd s\u1ef1 ki\u1ec7n n\u00ean \u0111\u01b0\u1ee3c \u0111\u1ecbnh c\u1ea5u h\u00ecnh \u0111\u1ec3 ghi l\u1ea1i c\u00e1c chuy\u1ebfn \u0111i g\u00e2y phi\u1ec1n nhi\u1ec5u, l\u1ed7i li\u00ean l\u1ea1c v\u00e0 c\u00e1c b\u1ea5t th\u01b0\u1eddng kh\u00e1c c\u00f3 th\u1ec3 cho th\u1ea5y c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn EMI. Xem x\u00e9t \u0111\u1ecbnh k\u1ef3 d\u1eef li\u1ec7u \u0111\u00e3 ghi nh\u1eadt k\u00fd x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1eabu t\u01b0\u01a1ng quan v\u1edbi ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb c\u1ee5 th\u1ec3 ho\u1eb7c c\u00e1c bi\u1ebfn th\u1ec3 th\u1eddi gian trong ng\u00e0y trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb. M\u1ed9t s\u1ed1 b\u1ed9 ng\u1eaft m\u1ea1ch ti\u00ean ti\u1ebfn bao g\u1ed3m c\u00e1c t\u00ednh n\u0103ng t\u1ef1 ch\u1ea9n \u0111o\u00e1n ph\u00e1t hi\u1ec7n v\u00e0 b\u00e1o c\u00e1o c\u00e1c l\u1ed7i b\u00ean trong c\u00f3 kh\u1ea3 n\u0103ng do EMI g\u00e2y ra, cho ph\u00e9p can thi\u1ec7p ch\u1ee7 \u0111\u1ed9ng tr\u01b0\u1edbc khi x\u1ea3y ra l\u1ed7i nghi\u00eam tr\u1ecdng.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/EMI-testing-configuration-for-electronic-MCCB-trip-units.webp\" alt=\"EMI testing configuration for electronic MCCB trip units - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px; font-size: 0.9em;\">C\u1ea5u h\u00ecnh ki\u1ec3m tra EMI cho b\u1ed9 ng\u1eaft m\u1ea1ch MCCB \u0111i\u1ec7n t\u1eed \u2013 VIOX Electric<\/figcaption><\/figure>\n<h2>Nghi\u00ean c\u1ee9u \u0111i\u1ec3n h\u00ecnh: Gi\u1ea3m thi\u1ec3u EMI \u1ee9ng d\u1ee5ng VFD<\/h2>\n<p>M\u1ed9t c\u01a1 s\u1edf s\u1ea3n xu\u1ea5t \u0111\u00e3 tr\u1ea3i qua c\u00e1c chuy\u1ebfn \u0111i g\u00e2y phi\u1ec1n nhi\u1ec5u l\u1eb7p \u0111i l\u1eb7p l\u1ea1i c\u1ee7a MCCB b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 75 kW \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi \u1ed5 \u0111\u0129a t\u1ea7n s\u1ed1 thay \u0111\u1ed5i. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed s\u1ebd v\u1ea5p ng\u00e3 ng\u1eabu nhi\u00ean trong qu\u00e1 tr\u00ecnh t\u0103ng t\u1ed1c v\u00e0 gi\u1ea3m t\u1ed1c \u0111\u1ed9ng c\u01a1, g\u00e2y ra gi\u00e1n \u0111o\u1ea1n s\u1ea3n xu\u1ea5t trung b\u00ecnh ba l\u1ea7n m\u1ed7i ca. \u0110i\u1ec1u tra ban \u0111\u1ea7u cho th\u1ea5y r\u1eb1ng MCCB \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t trong c\u00f9ng m\u1ed9t v\u1ecf v\u1edbi VFD, v\u1edbi c\u00e1p \u0111i\u1ec1u khi\u1ec3n kh\u00f4ng \u0111\u01b0\u1ee3c che ch\u1eafn \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn c\u00f9ng v\u1edbi c\u00e1p \u0111\u1ea7u ra VFD. C\u00e1c ph\u00e9p \u0111o tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb cho th\u1ea5y c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng b\u1ee9c x\u1ea1 v\u01b0\u1ee3t qu\u00e1 30 V\/m t\u1ea1i c\u00e1c v\u1ecb tr\u00ed MCCB trong qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch VFD, g\u1ea5p ba l\u1ea7n m\u1ee9c ki\u1ec3m tra IEC 60947-2.<\/p>\n<p>Chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n bao g\u1ed3m di d\u1eddi MCCB \u0111\u1ebfn m\u1ed9t v\u1ecf kim lo\u1ea1i ri\u00eang bi\u1ec7t c\u00e1ch v\u1ecf VFD 1 m\u00e9t, l\u1eafp \u0111\u1eb7t b\u1ed9 l\u1ecdc \u0111\u01b0\u1eddng d\u00e2y \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cho c\u00e1c \u1ee9ng d\u1ee5ng VFD tr\u00ean ngu\u1ed3n \u0111i\u1ec7n cho m\u1ed7i b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed, thay th\u1ebf c\u00e1p \u0111i\u1ec1u khi\u1ec3n kh\u00f4ng \u0111\u01b0\u1ee3c che ch\u1eafn b\u1eb1ng c\u00e1p xo\u1eafn \u0111\u00f4i \u0111\u01b0\u1ee3c che ch\u1eafn v\u1edbi c\u00e1c t\u1ea5m ch\u1eafn \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t \u1edf c\u1ea3 hai \u0111\u1ea7u, l\u1eafp \u0111\u1eb7t l\u00f5i ferit tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c c\u00e1p \u0111i v\u00e0o v\u1ecf MCCB v\u00e0 \u0111\u1ecbnh tuy\u1ebfn c\u00e1p ngu\u1ed3n trong c\u00e1c \u1ed1ng d\u1eabn ri\u00eang bi\u1ec7t t\u1eeb c\u00e1p \u0111\u1ea7u ra VFD v\u1edbi kho\u1ea3ng c\u00e1ch t\u1ed1i thi\u1ec3u 50 cm. Sau khi th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p n\u00e0y, c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1ea1i c\u00e1c v\u1ecb tr\u00ed MCCB \u0111\u00e3 gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi 8 V\/m v\u00e0 ti\u1ebfng \u1ed3n d\u1eabn tr\u00ean c\u00e1p ngu\u1ed3n \u0111\u00e3 gi\u1ea3m 25 dB.<\/p>\n<p>C\u01a1 s\u1edf \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng trong s\u00e1u th\u00e1ng sau c\u00e1c s\u1eeda \u0111\u1ed5i m\u00e0 kh\u00f4ng c\u00f3 m\u1ed9t chuy\u1ebfn \u0111i g\u00e2y phi\u1ec1n nhi\u1ec5u n\u00e0o, lo\u1ea1i b\u1ecf chi ph\u00ed th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng h\u00e0ng n\u0103m \u01b0\u1edbc t\u00ednh l\u00e0 45.000 \u0111\u00f4 la. Tr\u01b0\u1eddng h\u1ee3p n\u00e0y ch\u1ee9ng minh r\u1eb1ng vi\u1ec7c gi\u1ea3m thi\u1ec3u EMI c\u00f3 h\u1ec7 th\u1ed1ng gi\u1ea3i quy\u1ebft nhi\u1ec1u \u0111\u01b0\u1eddng d\u1eabn gh\u00e9p n\u1ed1i c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft ngay c\u1ea3 c\u00e1c v\u1ea5n \u0111\u1ec1 nhi\u1ec5u nghi\u00eam tr\u1ecdng v\u00e0 chi ph\u00ed gi\u1ea3m thi\u1ec3u th\u00edch h\u1ee3p th\u01b0\u1eddng th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi chi ph\u00ed gi\u00e1n \u0111o\u1ea1n s\u1ea3n xu\u1ea5t l\u1eb7p \u0111i l\u1eb7p l\u1ea1i.<\/p>\n<h2>Ch\u1ecdn MCCB ph\u00f9 h\u1ee3p cho \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n<\/h2>\n<p>L\u1ef1a ch\u1ecdn gi\u1eefa b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed v\u00e0 t\u1eeb nhi\u1ec7t \u0111\u00f2i h\u1ecfi ph\u1ea3i \u0111\u00e1nh gi\u00e1 c\u1ea9n th\u1eadn c\u00e1c y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng, m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb v\u00e0 c\u00e1c \u01b0u ti\u00ean ho\u1ea1t \u0111\u1ed9ng. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u ph\u1ed1i h\u1ee3p b\u1ea3o v\u1ec7 ch\u00ednh x\u00e1c, c\u00e0i \u0111\u1eb7t c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh, b\u1ea3o v\u1ec7 ch\u1ea1m \u0111\u1ea5t v\u1edbi \u0111\u1ed9 nh\u1ea1y c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh, t\u00edch h\u1ee3p giao ti\u1ebfp v\u1edbi h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u00f2a nh\u00e0 ho\u1eb7c SCADA, ghi nh\u1eadt k\u00fd d\u1eef li\u1ec7u v\u00e0 gi\u00e1m s\u00e1t ch\u1ea5t l\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng ho\u1eb7c kh\u00f3a li\u00ean \u0111\u1ed9ng ch\u1ecdn v\u00f9ng. Tuy nhi\u00ean, nh\u1eefng l\u1ee3i \u00edch n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc v\u1edbi kh\u1ea3 n\u0103ng d\u1ec5 b\u1ecb EMI v\u00e0 c\u00e1c y\u00eau c\u1ea7u gi\u1ea3m thi\u1ec3u.<\/p>\n<p>C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch t\u1eeb nhi\u1ec7t v\u1eabn l\u00e0 l\u1ef1a ch\u1ecdn \u01b0u ti\u00ean cho c\u00e1c \u1ee9ng d\u1ee5ng trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb kh\u1eafc nghi\u1ec7t, n\u01a1i kh\u00f3 gi\u1ea3m thi\u1ec3u hi\u1ec7u qu\u1ea3, l\u1eafp \u0111\u1eb7t g\u1ea7n VFD c\u00f4ng su\u1ea5t cao ho\u1eb7c thi\u1ebft b\u1ecb h\u00e0n m\u00e0 kh\u00f4ng c\u00f3 kho\u1ea3ng c\u00e1ch v\u1eadt l\u00fd, l\u1eafp \u0111\u1eb7t ngo\u00e0i tr\u1eddi ho\u1eb7c m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t, n\u01a1i t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a v\u1ecf c\u00f3 th\u1ec3 b\u1ecb x\u00e2m ph\u1ea1m, c\u00e1c \u1ee9ng d\u1ee5ng \u01b0u ti\u00ean \u0111\u1ed9 tin c\u1eady t\u1ed1i \u0111a h\u01a1n c\u00e1c t\u00ednh n\u0103ng n\u00e2ng cao ho\u1eb7c c\u00e1c t\u00ecnh hu\u1ed1ng trang b\u1ecb th\u00eam, n\u01a1i vi\u1ec7c th\u00eam c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI l\u00e0 kh\u00f4ng th\u1ef1c t\u1ebf. Kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1ed1n c\u00f3 c\u1ee7a c\u00e1c c\u01a1 ch\u1ebf t\u1eeb nhi\u1ec7t \u0111\u1ed1i v\u1edbi nhi\u1ec5u \u0111i\u1ec7n t\u1eeb cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 m\u1ea1nh m\u1ebd m\u00e0 kh\u00f4ng y\u00eau c\u1ea7u th\u1ef1c h\u00e0nh c\u00e0i \u0111\u1eb7t \u0111\u1eb7c bi\u1ec7t ho\u1eb7c c\u00e1c th\u00e0nh ph\u1ea7n gi\u1ea3m thi\u1ec3u b\u1ed5 sung.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ecdn m\u1eb7c d\u00f9 m\u00f4i tr\u01b0\u1eddng EMI \u0111\u1ea7y th\u00e1ch th\u1ee9c, vi\u1ec7c ch\u1ec9 \u0111\u1ecbnh c\u00e1c thi\u1ebft b\u1ecb c\u00f3 x\u1ebfp h\u1ea1ng mi\u1ec5n nhi\u1ec5m n\u00e2ng cao tr\u00ean c\u00e1c y\u00eau c\u1ea7u t\u1ed1i thi\u1ec3u IEC 60947-2 s\u1ebd cung c\u1ea5p th\u00eam bi\u00ean \u0111\u1ed9. M\u1ed9t s\u1ed1 nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed c\u1ea5p c\u00f4ng nghi\u1ec7p ho\u1eb7c \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 VFD v\u1edbi m\u1ee9c mi\u1ec5n nhi\u1ec5m t\u1eeb 20-30 V\/m tr\u1edf l\u00ean, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb kh\u1eafc nghi\u1ec7t. Xem x\u00e9t d\u1eef li\u1ec7u th\u1eed nghi\u1ec7m v\u00e0 ch\u1ee9ng nh\u1eadn c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u00e3 ch\u1ecdn \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c cho m\u00f4i tr\u01b0\u1eddng EMI c\u1ee5 th\u1ec3 d\u1ef1 ki\u1ebfn trong qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t.<\/p>\n<h2>T\u00e0i Nguy\u00ean Li\u00ean Quan<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u to\u00e0n di\u1ec7n v\u1ec1 l\u1ef1a ch\u1ecdn MCCB, ph\u1ed1i h\u1ee3p b\u1ea3o v\u1ec7 v\u00e0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng \u0111i\u1ec7n, h\u00e3y kh\u00e1m ph\u00e1 c\u00e1c h\u01b0\u1edbng d\u1eabn VIOX li\u00ean quan n\u00e0y:<\/p>\n<ul>\n<li><a href=\"https:\/\/test.viox.com\/vi\/what-is-a-molded-case-circuit-breaker-mccb\/\">B\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac (MCCB) l\u00e0 g\u00ec?<\/a> \u2013 H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 c\u1ea5u tr\u00fac, ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a MCCB<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/understanding-trip-curves\/\">Hi\u1ec3u v\u1ec1 \u0110\u01b0\u1eddng cong Chuy\u1ebfn \u0111i<\/a> \u2013 H\u01b0\u1edbng d\u1eabn c\u1ea7n thi\u1ebft v\u1ec1 ph\u1ed1i h\u1ee3p b\u1ea3o v\u1ec7 v\u00e0 l\u1ef1a ch\u1ecdn \u0111\u01b0\u1eddng cong<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/how-to-select-an-mccb-for-a-panel\/\">C\u00e1ch ch\u1ecdn MCCB cho b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n<\/a> \u2013 Ph\u01b0\u01a1ng ph\u00e1p lu\u1eadn l\u1ef1a ch\u1ecdn MCCB to\u00e0n di\u1ec7n<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/mccb-vs-mcb\/\">MCCB so v\u1edbi MCB<\/a> \u2013 So s\u00e1nh chi ti\u1ebft c\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/adjustable-circuit-breaker-guide\/\">H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u1ea7u dao c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh<\/a> \u2013 T\u00ecm hi\u1ec3u c\u00e0i \u0111\u1eb7t chuy\u1ebfn \u0111i c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/circuit-breaker-ratings-icu-ics-icw-icm\/\">\u0110\u1ecbnh m\u1ee9c Aptomat ICU ICS ICW ICM<\/a> \u2013 Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u1ec1 c\u00f4ng su\u1ea5t v\u00e0 \u0111\u1ecbnh m\u1ee9c ng\u1eaft<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/industrial-control-panel-components-guide\/\">H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u00e0nh ph\u1ea7n b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p<\/a> \u2013 Thi\u1ebft k\u1ebf b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ho\u00e0n ch\u1ec9nh v\u00e0 l\u1ef1a ch\u1ecdn th\u00e0nh ph\u1ea7n<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/electrical-derating-temperature-altitude-grouping-factors\/\">C\u00e1c y\u1ebfu t\u1ed1 gi\u1ea3m \u0111\u1ecbnh m\u1ee9c \u0111i\u1ec7n do nhi\u1ec7t \u0111\u1ed9, \u0111\u1ed9 cao, nh\u00f3m<\/a> \u2013 Gi\u1ea3m \u0111\u1ecbnh m\u1ee9c do m\u00f4i tr\u01b0\u1eddng \u0111\u1ec3 b\u1ea3o v\u1ec7 ch\u00ednh x\u00e1c<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/circuit-breaker-buzzing-diagnostic-guide\/\">H\u01b0\u1edbng d\u1eabn ch\u1ea9n \u0111o\u00e1n ti\u1ebfng \u1ed3n b\u1ed9 ng\u1eaft m\u1ea1ch<\/a> \u2013 Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 ho\u1ea1t \u0111\u1ed9ng b\u1ea5t th\u01b0\u1eddng c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/types-of-circuit-breakers\/\">C\u00e1c lo\u1ea1i m\u00e1y c\u1eaft m\u1ea1ch<\/a> \u2013 T\u1ed5ng quan to\u00e0n di\u1ec7n v\u1ec1 c\u00e1c c\u00f4ng ngh\u1ec7 b\u1ed9 ng\u1eaft m\u1ea1ch<\/li>\n<\/ul>\n<h2>Nh\u1eefng C\u00e2u H\u1ecfi Th\u01b0\u1eddng<\/h2>\n<h3>H\u1ecfi: EMI c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng v\u0129nh vi\u1ec5n b\u1ed9 ng\u1eaft m\u1ea1ch MCCB \u0111i\u1ec7n t\u1eed kh\u00f4ng?<\/h3>\n<p>\u0110\u00e1p: M\u1eb7c d\u00f9 h\u1ea7u h\u1ebft c\u00e1c s\u1ef1 ki\u1ec7n EMI g\u00e2y ra c\u00e1c tr\u1ee5c tr\u1eb7c t\u1ea1m th\u1eddi nh\u01b0 v\u1ea5p ng\u00e3 g\u00e2y phi\u1ec1n nhi\u1ec5u ho\u1eb7c \u0111\u1ecdc sai, nh\u01b0ng c\u00e1c nhi\u1ec5u \u0111i\u1ec7n t\u1eeb nghi\u00eam tr\u1ecdng c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ra thi\u1ec7t h\u1ea1i v\u0129nh vi\u1ec5n cho c\u00e1c th\u00e0nh ph\u1ea7n \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m. C\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n m\u1ea1ch n\u0103ng l\u01b0\u1ee3ng cao t\u1eeb s\u00e9t \u0111\u00e1nh ho\u1eb7c xung chuy\u1ec3n m\u1ea1ch c\u00f3 th\u1ec3 v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c \u0111i\u1ec7n \u00e1p c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn, g\u00e2y ra l\u1ed7i ngay l\u1eadp t\u1ee9c. Vi\u1ec7c ti\u1ebfp x\u00fac l\u1eb7p \u0111i l\u1eb7p l\u1ea1i v\u1edbi EMI m\u1ee9c cao c\u0169ng c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 suy gi\u1ea3m t\u00edch l\u0169y c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n, l\u00e0m gi\u1ea3m \u0111\u1ed9 tin c\u1eady l\u00e2u d\u00e0i. B\u1ea3o v\u1ec7 ch\u1ed1ng xung \u0111i\u1ec7n v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI th\u00edch h\u1ee3p ng\u0103n ng\u1eeba c\u1ea3 gi\u00e1n \u0111o\u1ea1n t\u1ea1m th\u1eddi v\u00e0 thi\u1ec7t h\u1ea1i v\u0129nh vi\u1ec5n.<\/p>\n<h3>H\u1ecfi: L\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 bi\u1ebft li\u1ec7u chuy\u1ebfn \u0111i g\u00e2y phi\u1ec1n nhi\u1ec5u c\u1ee7a t\u00f4i c\u00f3 ph\u1ea3i do EMI g\u00e2y ra kh\u00f4ng?<\/h3>\n<p>\u0110\u00e1p: C\u00e1c chuy\u1ebfn \u0111i g\u00e2y phi\u1ec1n nhi\u1ec5u li\u00ean quan \u0111\u1ebfn EMI th\u01b0\u1eddng th\u1ec3 hi\u1ec7n c\u00e1c m\u1eabu \u0111\u1eb7c tr\u01b0ng \u0111\u1ec3 ph\u00e2n bi\u1ec7t ch\u00fang v\u1edbi c\u00e1c chuy\u1ebfn \u0111i do qu\u00e1 t\u1ea3i ho\u1eb7c l\u1ed7i th\u1ef1c t\u1ebf g\u00e2y ra. C\u00e1c ch\u1ec9 s\u1ed1 ch\u00ednh bao g\u1ed3m c\u00e1c chuy\u1ebfn \u0111i x\u1ea3y ra trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh thi\u1ebft b\u1ecb c\u1ee5 th\u1ec3 (kh\u1edfi \u0111\u1ed9ng VFD, v\u1eadn h\u00e0nh h\u00e0n, truy\u1ec1n v\u00f4 tuy\u1ebfn), c\u00e1c chuy\u1ebfn \u0111i kh\u00f4ng c\u00f3 b\u1eb1ng ch\u1ee9ng t\u01b0\u01a1ng \u1ee9ng v\u1ec1 qu\u00e1 d\u00f2ng (kh\u00f4ng c\u00f3 h\u01b0 h\u1ecfng do nhi\u1ec7t, c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 kh\u00e1c kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng), c\u00e1c chuy\u1ebfn \u0111i x\u1ea3y ra ng\u1eabu nhi\u00ean m\u00e0 kh\u00f4ng t\u01b0\u01a1ng quan v\u1edbi thay \u0111\u1ed5i t\u1ea3i v\u00e0 c\u00e1c chuy\u1ebfn \u0111i ng\u1eebng sau khi th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI. \u0110o tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb v\u00e0 ki\u1ec3m tra ti\u1ebfng \u1ed3n d\u1eabn c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng EMI l\u00e0 nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5.<\/p>\n<h3>H\u1ecfi: C\u00f3 ti\u00eau chu\u1ea9n ng\u00e0nh n\u00e0o v\u1ec1 kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m EMI ngo\u00e0i IEC 60947-2 kh\u00f4ng?<\/h3>\n<p>\u0110\u00e1p: C\u00f3, m\u1ed9t s\u1ed1 ti\u00eau chu\u1ea9n b\u1ed5 sung c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng t\u00f9y thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng v\u00e0 v\u1ecb tr\u00ed \u0111\u1ecba l\u00fd. MIL-STD-461 ch\u1ec9 \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u EMI nghi\u00eam ng\u1eb7t h\u01a1n cho c\u00e1c \u1ee9ng d\u1ee5ng qu\u00e2n s\u1ef1 v\u00e0 h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5. EN 50121 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01b0\u1eddng s\u1eaft v\u1edbi c\u00e1c y\u00eau c\u1ea7u mi\u1ec5n nhi\u1ec5m c\u1ee5 th\u1ec3 \u0111\u1ed1i v\u1edbi toa xe v\u00e0 thi\u1ebft b\u1ecb b\u00ean \u0111\u01b0\u1eddng ray. IEC 61000-6-2 cung c\u1ea5p c\u00e1c ti\u00eau chu\u1ea9n mi\u1ec5n nhi\u1ec5m chung cho m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c tham chi\u1ebfu ngo\u00e0i c\u00e1c ti\u00eau chu\u1ea9n d\u00e0nh ri\u00eang cho s\u1ea3n ph\u1ea9m. UL 508A bao g\u1ed3m c\u00e1c y\u00eau c\u1ea7u EMC cho b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p \u1edf B\u1eafc M\u1ef9. Tu\u00e2n th\u1ee7 nhi\u1ec1u ti\u00eau chu\u1ea9n cung c\u1ea5p s\u1ef1 \u0111\u1ea3m b\u1ea3o l\u1edbn h\u01a1n v\u1ec1 ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady trong c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb \u0111a d\u1ea1ng.<\/p>\n<h3>H\u1ecfi: T\u00f4i c\u00f3 th\u1ec3 trang b\u1ecb th\u00eam kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 EMI cho MCCB hi\u1ec7n c\u00f3 b\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed kh\u00f4ng?<\/h3>\n<p>\u0110\u00e1p: C\u00f3, nhi\u1ec1u bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u01b0 trang b\u1ecb th\u00eam cho c\u00e1c c\u00e0i \u0111\u1eb7t hi\u1ec7n c\u00f3. Th\u00eam b\u1ed9 l\u1ecdc \u0111\u01b0\u1eddng d\u00e2y v\u00e0o k\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n, l\u1eafp \u0111\u1eb7t l\u00f5i ferit tr\u00ean c\u00e1p, th\u1ef1c hi\u1ec7n \u0111\u1ecbnh tuy\u1ebfn v\u00e0 t\u00e1ch c\u00e1p th\u00edch h\u1ee3p, c\u1ea3i thi\u1ec7n k\u1ebft n\u1ed1i n\u1ed1i \u0111\u1ea5t v\u00e0 li\u00ean k\u1ebft v\u00e0 th\u00eam l\u1edbp che ch\u1eafn v\u00e0o v\u1ecf b\u1ecdc \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n m\u00e0 kh\u00f4ng c\u1ea7n thay th\u1ebf ch\u00ednh MCCB. Tuy nhi\u00ean, n\u1ebfu c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch thi\u1ebfu kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1ed1n c\u00f3 \u0111\u1ea7y \u0111\u1ee7, c\u00e1c bi\u1ec7n ph\u00e1p b\u00ean ngo\u00e0i n\u00e0y c\u00f3 th\u1ec3 ch\u1ec9 cung c\u1ea5p c\u1ea3i thi\u1ec7n m\u1ed9t ph\u1ea7n. Trong m\u00f4i tr\u01b0\u1eddng EMI nghi\u00eam tr\u1ecdng, vi\u1ec7c thay th\u1ebf b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed b\u1eb1ng lo\u1ea1i t\u1eeb nhi\u1ec7t c\u00f3 th\u1ec3 l\u00e0 gi\u1ea3i ph\u00e1p hi\u1ec7u qu\u1ea3 nh\u1ea5t v\u1ec1 chi ph\u00ed.<\/p>\n<h3>H\u1ecfi: S\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 chi ph\u00ed \u0111i\u1ec3n h\u00ecnh gi\u1eefa MCCB \u0111i\u1ec7n t\u1eed v\u00e0 t\u1eeb nhi\u1ec7t l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u00e1p: C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed th\u01b0\u1eddng c\u00f3 gi\u00e1 cao h\u01a1n 50-150% so v\u1edbi MCCB t\u1eeb nhi\u1ec7t t\u01b0\u01a1ng \u0111\u01b0\u01a1ng, v\u1edbi m\u1ee9c ph\u00ed b\u1ea3o hi\u1ec3m t\u0103ng l\u00ean \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb c\u00f3 c\u00e1c t\u00ednh n\u0103ng n\u00e2ng cao nh\u01b0 giao ti\u1ebfp, b\u1ea3o v\u1ec7 ch\u1ea1m \u0111\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m n\u00e2ng cao. \u0110\u1ed1i v\u1edbi MCCB 400A, m\u1ed9t thi\u1ebft b\u1ecb t\u1eeb nhi\u1ec7t c\u01a1 b\u1ea3n c\u00f3 th\u1ec3 c\u00f3 gi\u00e1 300-500 \u0111\u00f4 la, trong khi phi\u00ean b\u1ea3n \u0111i\u1ec7n t\u1eed dao \u0111\u1ed9ng t\u1eeb 600-1200 \u0111\u00f4 la. Tuy nhi\u00ean, so s\u00e1nh n\u00e0y n\u00ean bao g\u1ed3m chi ph\u00ed c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI (b\u1ed9 l\u1ecdc, c\u00e1p \u0111\u01b0\u1ee3c che ch\u1eafn, v\u1ecf ri\u00eang bi\u1ec7t) c\u00f3 th\u1ec3 th\u00eam 100-500 \u0111\u00f4 la cho m\u1ed7i l\u1ea7n c\u00e0i \u0111\u1eb7t. T\u1ed5ng chi ph\u00ed c\u00e0i \u0111\u1eb7t kh\u00e1c nhau c\u00f3 th\u1ec3 l\u00e0 75-200%, l\u00e0m cho c\u00e1c thi\u1ebft b\u1ecb t\u1eeb nhi\u1ec7t kinh t\u1ebf h\u01a1n \u0111\u00e1ng k\u1ec3 cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00f4ng y\u00eau c\u1ea7u c\u00e1c t\u00ednh n\u0103ng c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed.<\/p>\n<h3>H\u1ecfi: Kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m EMI n\u00ean \u0111\u01b0\u1ee3c ki\u1ec3m tra th\u01b0\u1eddng xuy\u00ean nh\u01b0 th\u1ebf n\u00e0o trong c\u00e1c c\u01a1 s\u1edf \u0111ang ho\u1ea1t \u0111\u1ed9ng?<\/h3>\n<p>\u0110\u00e1p: Ki\u1ec3m tra ban \u0111\u1ea7u n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong qu\u00e1 tr\u00ecnh ch\u1ea1y th\u1eed \u0111\u1ec3 x\u00e1c minh ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang c\u00e1ch trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb th\u1ef1c t\u1ebf. N\u00ean ki\u1ec3m tra l\u1ea1i \u0111\u1ecbnh k\u1ef3 sau b\u1ea5t k\u1ef3 thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 n\u00e0o \u0111\u1ed1i v\u1edbi c\u01a1 s\u1edf, bao g\u1ed3m l\u1eafp \u0111\u1eb7t thi\u1ebft b\u1ecb c\u00f4ng su\u1ea5t cao m\u1edbi (VFD, h\u1ec7 th\u1ed1ng h\u00e0n, thi\u1ebft b\u1ecb RF), s\u1eeda \u0111\u1ed5i h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i \u0111i\u1ec7n ho\u1eb7c di d\u1eddi MCCB ho\u1eb7c ngu\u1ed3n EMI. Ki\u1ec3m tra h\u00e0ng n\u0103m l\u00e0 th\u1eadn tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng quan tr\u1ecdng, n\u01a1i c\u00e1c chuy\u1ebfn \u0111i g\u00e2y phi\u1ec1n nhi\u1ec5u c\u00f3 h\u1eadu qu\u1ea3 nghi\u00eam tr\u1ecdng. Gi\u00e1m s\u00e1t li\u00ean t\u1ee5c th\u00f4ng qua ghi nh\u1eadt k\u00fd s\u1ef1 ki\u1ec7n v\u00e0 c\u00e1c t\u00ednh n\u0103ng ch\u1ea9n \u0111o\u00e1n cung c\u1ea5p x\u00e1c minh li\u00ean t\u1ee5c m\u00e0 kh\u00f4ng y\u00eau c\u1ea7u ki\u1ec3m tra ch\u00ednh th\u1ee9c.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Nhi\u1ec5u \u0111i\u1ec7n t\u1eeb g\u00e2y ra m\u1ed9t th\u00e1ch th\u1ee9c \u0111\u00e1ng k\u1ec3 cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch MCCB \u0111i\u1ec7n t\u1eed trong m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p, nh\u01b0ng s\u1ef1 hi\u1ec3u bi\u1ebft v\u00e0 gi\u1ea3m thi\u1ec3u c\u00f3 h\u1ec7 th\u1ed1ng c\u00e1c c\u01a1 ch\u1ebf gh\u00e9p n\u1ed1i EMI cho ph\u00e9p ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady ngay c\u1ea3 trong \u0111i\u1ec1u ki\u1ec7n \u0111i\u1ec7n t\u1eeb kh\u1eafc nghi\u1ec7t. \u0110\u1ed9 ch\u00ednh x\u00e1c, t\u00ednh linh ho\u1ea1t v\u00e0 kh\u1ea3 n\u0103ng giao ti\u1ebfp v\u01b0\u1ee3t tr\u1ed9i c\u1ee7a c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed l\u00e0m cho ch\u00fang ng\u00e0y c\u00e0ng h\u1ea5p d\u1eabn \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i, v\u1edbi \u0111i\u1ec1u ki\u1ec7n ph\u1ea3i ch\u00fa \u00fd \u0111\u00fang m\u1ee9c \u0111\u1ebfn kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m EMI trong qu\u00e1 tr\u00ecnh l\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m, thi\u1ebft k\u1ebf l\u1eafp \u0111\u1eb7t v\u00e0 x\u00e1c minh ch\u1ea1y th\u1eed.<\/p>\n<p>S\u1ef1 \u0111\u00e1nh \u0111\u1ed5i c\u01a1 b\u1ea3n gi\u1eefa ch\u1ee9c n\u0103ng n\u00e2ng cao v\u00e0 \u0111\u1ed9 b\u1ec1n EMI v\u1ed1n c\u00f3 \u0111\u00f2i h\u1ecfi ph\u1ea3i \u0111\u00e1nh gi\u00e1 c\u1ea9n th\u1eadn c\u00e1c y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng v\u00e0 m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 c\u00e1c t\u00ednh n\u0103ng c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed l\u00e0 c\u1ea7n thi\u1ebft, vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u EMI to\u00e0n di\u1ec7n \u2014 bao g\u1ed3m th\u1ef1c h\u00e0nh c\u00e0i \u0111\u1eb7t th\u00edch h\u1ee3p, \u0111\u1ecbnh tuy\u1ebfn v\u00e0 che ch\u1eafn c\u00e1p, c\u00e1c th\u00e0nh ph\u1ea7n l\u1ecdc v\u00e0 tri\u1ec7t ti\u00eau v\u00e0 n\u1ed1i \u0111\u1ea5t hi\u1ec7u qu\u1ea3 \u2014 \u0111\u1ea3m b\u1ea3o b\u1ea3o v\u1ec7 \u0111\u00e1ng tin c\u1eady m\u00e0 kh\u00f4ng b\u1ecb v\u1ea5p ng\u00e3 g\u00e2y phi\u1ec1n nhi\u1ec5u. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng trong m\u00f4i tr\u01b0\u1eddng EMI nghi\u00eam tr\u1ecdng, n\u01a1i kh\u00f3 ho\u1eb7c kh\u00f4ng th\u1ef1c t\u1ebf \u0111\u1ec3 gi\u1ea3m thi\u1ec3u, c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch t\u1eeb nhi\u1ec7t cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 m\u1ea1nh m\u1ebd v\u1edbi kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1ed1n c\u00f3 \u0111\u1ed1i v\u1edbi nhi\u1ec5u \u0111i\u1ec7n t\u1eeb.<\/p>\n<p>Khi c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n v\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a s\u1ed1 h\u00f3a, t\u00edch h\u1ee3p truy\u1ec1n th\u00f4ng v\u00e0 n\u1ed9i dung \u0111i\u1ec7n t\u1eed c\u00f4ng su\u1ea5t, m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb s\u1ebd ng\u00e0y c\u00e0ng tr\u1edf n\u00ean th\u00e1ch th\u1ee9c h\u01a1n. C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t \u0111ang \u0111\u00e1p \u1ee9ng b\u1eb1ng c\u00e1c thi\u1ebft k\u1ebf t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m, c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng che ch\u1eafn v\u00e0 c\u00e1c thu\u1eadt to\u00e1n firmware m\u1ea1nh m\u1ebd h\u01a1n. Tuy nhi\u00ean, tr\u00e1ch nhi\u1ec7m cho vi\u1ec7c \u1ee9ng d\u1ee5ng th\u00e0nh c\u00f4ng cu\u1ed1i c\u00f9ng thu\u1ed9c v\u1ec1 c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf v\u00e0 l\u1eafp \u0111\u1eb7t h\u1ec7 th\u1ed1ng, nh\u1eefng ng\u01b0\u1eddi ph\u1ea3i hi\u1ec3u c\u00e1c c\u01a1 ch\u1ebf gh\u00e9p n\u1ed1i EMI, th\u1ef1c hi\u1ec7n c\u00e1c chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u hi\u1ec7u qu\u1ea3 v\u00e0 x\u00e1c minh ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang th\u00f4ng qua th\u1eed nghi\u1ec7m c\u00f3 h\u1ec7 th\u1ed1ng. B\u1eb1ng c\u00e1ch tu\u00e2n theo c\u00e1c nguy\u00ean t\u1eafc v\u00e0 th\u1ef1c h\u00e0nh \u0111\u01b0\u1ee3c n\u00eau trong h\u01b0\u1edbng d\u1eabn n\u00e0y, c\u00e1c chuy\u00ean gia \u0111i\u1ec7n c\u00f3 th\u1ec3 t\u1ef1 tin tri\u1ec3n khai c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac \u0111i\u1ec7n t\u1eed (MCCB) cung c\u1ea5p c\u00e1c kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 ti\u00ean ti\u1ebfn v\u1edbi \u0111\u1ed9 tin c\u1eady theo y\u00eau c\u1ea7u c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p quan tr\u1ecdng.<\/p>\n<hr \/>\n<p><strong>Gi\u1edbi thi\u1ec7u v\u1ec1 VIOX Electric<\/strong>VIOX Electric l\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t B2B h\u00e0ng \u0111\u1ea7u v\u1ec1 thi\u1ebft b\u1ecb \u0111i\u1ec7n, chuy\u00ean v\u1ec1 MCCB ch\u1ea5t l\u01b0\u1ee3ng cao, b\u1ed9 ng\u1eaft m\u1ea1ch v\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 \u0111i\u1ec7n cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p, th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng. S\u1ea3n ph\u1ea9m c\u1ee7a ch\u00fang t\u00f4i \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf bao g\u1ed3m IEC 60947-2, UL 489 v\u00e0 GB 14048, v\u1edbi th\u1eed nghi\u1ec7m EMC to\u00e0n di\u1ec7n \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb kh\u1eafc nghi\u1ec7t. \u0110\u1ec3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt, h\u1ed7 tr\u1ee3 l\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m ho\u1eb7c c\u00e1c gi\u1ea3i ph\u00e1p t\u00f9y ch\u1ec9nh, h\u00e3y li\u00ean h\u1ec7 v\u1edbi \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u1ee7a ch\u00fang t\u00f4i.<\/p>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 136px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 136px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Electronic trip units in molded case circuit breakers (MCCBs) can malfunction when exposed to electromagnetic interference, causing unexpected shutdowns that cost industrial facilities thousands of dollars per hour. This comprehensive guide examines how EMI affects electronic MCCB trip units, the underlying mechanisms of interference, and proven mitigation strategies to ensure reliable circuit protection in electromagnetically [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-21542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/21542","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/comments?post=21542"}],"version-history":[{"count":1,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/21542\/revisions"}],"predecessor-version":[{"id":21544,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/21542\/revisions\/21544"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/21543"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=21542"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=21542"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=21542"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}