{"id":2415,"date":"2026-08-16T12:30:00","date_gmt":"2026-08-16T12:30:00","guid":{"rendered":"https:\/\/lbajiele.com\/?p=2415"},"modified":"2026-09-23T20:46:06","modified_gmt":"2026-09-23T20:46:06","slug":"complete-guide-to-transformer-types-construction","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/vi\/blog\/complete-guide-to-transformer-types-construction\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 c\u00e1c lo\u1ea1i v\u00e0 c\u1ea5u tr\u00fac m\u00e1y bi\u1ebfn \u00e1p"},"content":{"rendered":"<p>A <strong>Bi\u1ebfn d\u00f2ng \u0111i\u1ec7n (CT)<\/strong> chuy\u1ec3n \u0111\u1ed5i d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p l\u1edbn th\u00e0nh d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p nh\u1ecf h\u01a1n, \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a \u0111\u1ec3 c\u00e1c thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng v\u00e0 r\u01a1-le b\u1ea3o v\u1ec7 c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng m\u1ed9t c\u00e1ch an to\u00e0n. S\u1ef1 \u0111\u01a1n gi\u1ea3n r\u00f5 r\u1ec7t c\u1ee7a n\u00f3 che gi\u1ea5u nh\u1eefng l\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf quan tr\u1ecdng: k\u1ebft c\u1ea5u, t\u1ef7 s\u1ed1, c\u1ea5p ch\u00ednh x\u00e1c, t\u1ea3i \u0111\u1ecbnh m\u1ee9c, hi\u1ec7u su\u1ea5t b\u00e3o h\u00f2a v\u00e0 c\u1ef1c t\u00ednh l\u1eafp \u0111\u1eb7t \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn k\u1ebft qu\u1ea3. H\u01b0\u1edbng d\u1eabn n\u00e0y gi\u1ea3i th\u00edch c\u00e1c lo\u1ea1i v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a bi\u1ebfn d\u00f2ng \u0111i\u1ec7n, sau \u0111\u00f3 h\u01b0\u1edbng d\u1eabn c\u00e1ch \u0111\u1ecbnh m\u1ee9c k\u1ef9 thu\u1eadt cho bi\u1ebfn d\u00f2ng \u0111i\u1ec7n d\u00f9ng trong \u0111o l\u01b0\u1eddng v\u00e0 b\u1ea3o v\u1ec7 b\u00ean trong m\u00e1y bi\u1ebfn \u00e1p v\u00e0 thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft.<\/p>\n<h2>Bi\u1ebfn d\u00f2ng \u0111i\u1ec7n l\u00e0 g\u00ec?<\/h2>\n<p>Bi\u1ebfn d\u00f2ng \u0111i\u1ec7n l\u00e0 m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi m\u1ea1ch \u0111i\u1ec7n. Cu\u1ed9n s\u01a1 c\u1ea5p c\u00f3 th\u1ec3 l\u00e0 c\u00e1p, thanh c\u00e1i ho\u1eb7c m\u1ed9t cu\u1ed9n d\u00e2y chuy\u00ean d\u1ee5ng. D\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u \u1edf s\u01a1 c\u1ea5p sinh ra t\u1eeb th\u00f4ng trong l\u00f5i, c\u1ea3m \u1ee9ng ra m\u1ed9t d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p t\u1ef7 l\u1ec7 thu\u1eadn. C\u00e1c \u0111\u1ecbnh m\u1ee9c th\u1ee9 c\u1ea5p th\u00f4ng th\u01b0\u1eddng l\u00e0 5 A ho\u1eb7c 1 A, t\u00f9y thu\u1ed9c v\u00e0o h\u1ec7 th\u1ed1ng v\u00e0 ti\u00eau chu\u1ea9n.<\/p>\n<p>M\u00e1y bi\u1ebfn d\u00f2ng cung c\u1ea5p kh\u1ea3 n\u0103ng \u0111i\u1ec1u t\u1ef7 l\u1ec7 \u0111o l\u01b0\u1eddng v\u00e0 c\u00e1ch ly \u0111i\u1ec7n, nh\u01b0ng n\u00f3 kh\u00f4ng t\u00e1i t\u1ea1o ho\u00e0n h\u1ea3o m\u1ecdi d\u00f2ng \u0111i\u1ec7n. Sai s\u1ed1 t\u1ef7 s\u1ed1, \u0111\u1ed9 l\u1ec7ch pha, t\u1ed5n hao l\u00f5i th\u00e9p v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng b\u00e3o h\u00f2a ph\u1ea3i n\u1eb1m trong gi\u1edbi h\u1ea1n cho ph\u00e9p \u0111\u1ed1i v\u1edbi nhi\u1ec7m v\u1ee5 d\u1ef1 ki\u1ebfn.<\/p>\n<h2>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng<\/h2>\n<p>Trong m\u1ed9t m\u00e1y bi\u1ebfn d\u00f2ng \u0111i\u1ec7n (CT) l\u00fd t\u01b0\u1edfng, s\u1ed1 ampe-v\u00f2ng s\u01a1 c\u1ea5p b\u1eb1ng s\u1ed1 ampe-v\u00f2ng th\u1ee9 c\u1ea5p. N\u1ebfu m\u1ed9t CT d\u1ea1ng thanh d\u1eabn s\u01a1 c\u1ea5p c\u00f3 m\u1ed9t v\u00f2ng d\u00e2y s\u01a1 c\u1ea5p v\u00e0 200 v\u00f2ng d\u00e2y th\u1ee9 c\u1ea5p, d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p 1.000 A v\u1ec1 l\u00fd t\u01b0\u1edfng s\u1ebd t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p 5 A. C\u00e1c CT th\u1ef1c t\u1ebf \u0111\u00f2i h\u1ecfi d\u00f2ng \u0111i\u1ec7n t\u1eeb h\u00f3a, do \u0111\u00f3 vi\u1ec7c l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean c\u00e1c c\u1ea5p ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c ti\u00eau chu\u1ea9n h\u00f3a v\u00e0 g\u00e1nh \u0111\u1ecbnh m\u1ee9c.<\/p>\n<p><strong>Kh\u00f4ng bao gi\u1edd \u0111\u1ec3 h\u1edf m\u1ea1ch cu\u1ed9n th\u1ee9 c\u1ea5p c\u1ee7a bi\u1ebfn d\u00f2ng \u0111ang mang \u0111i\u1ec7n.<\/strong> Kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p ch\u1ed1ng l\u1ea1i t\u1eeb th\u00f4ng s\u01a1 c\u1ea5p, \u0111i\u1ec7n \u00e1p l\u00f5i c\u00f3 th\u1ec3 t\u0103ng l\u00ean m\u1ee9c nguy hi\u1ec3m v\u00e0 l\u00e0m h\u1ecfng l\u1edbp c\u00e1ch \u0111i\u1ec7n ho\u1eb7c g\u00e2y nguy hi\u1ec3m cho nh\u00e2n vi\u00ean. C\u00e1c li\u00ean k\u1ebft n\u1ed1i t\u1eaft v\u00e0 kh\u1ed1i th\u1eed nghi\u1ec7m n\u00ean \u0111\u01b0\u1ee3c trang b\u1ecb \u0111\u1ec3 c\u00e1c thi\u1ebft b\u1ecb \u0111o ho\u1eb7c r\u01a1-le c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00e1o d\u1ee1 m\u1ed9t c\u00e1ch an to\u00e0n b\u1edfi nh\u00e2n vi\u00ean c\u00f3 chuy\u00ean m\u00f4n.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Cutaway current transformer showing magnetic core, primary conductor and secondary winding\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/current-transformer-construction.png\"\/><figcaption>M\u1ed9t m\u00e1y bi\u1ebfn d\u00f2ng (CT) s\u1eed d\u1ee5ng m\u1ed9t l\u00f5i t\u1eeb v\u00e0 cu\u1ed9n d\u00e2y th\u1ee9 c\u1ea5p qu\u1ea5n xung quanh \u0111\u01b0\u1eddng d\u1eabn d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p.<\/figcaption><\/figure>\n<section class=\"lbaji-article-table\"><h2>B\u1ea3ng so s\u00e1nh v\u00e0 l\u1ef1a ch\u1ecdn nhanh<\/h2><p>S\u1eed d\u1ee5ng b\u1ea3ng n\u00e0y nh\u01b0 m\u1ed9t ph\u1ea7n t\u00f3m t\u1eaft nhanh v\u1ec1 c\u00e1c quy\u1ebft \u0111\u1ecbnh k\u1ef9 thu\u1eadt v\u00e0 mua s\u1eafm ch\u00ednh \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch trong b\u00e0i vi\u1ebft.<\/p><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th scope=\"col\">Khu v\u1ef1c quy\u1ebft \u0111\u1ecbnh<\/th><th scope=\"col\">\u00dd ngh\u0129a th\u1ef1c ti\u1ec5n<\/th><th scope=\"col\">C\u1ea7n x\u00e1c minh nh\u1eefng g\u00ec<\/th><\/tr><\/thead><tbody><tr><td>Bi\u1ebfn d\u00f2ng \u0111i\u1ec7n l\u00e0 g\u00ec?<\/td><td>Bi\u1ebfn d\u00f2ng \u0111i\u1ec7n l\u00e0 m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi m\u1ea1ch \u0111i\u1ec7n l\u1ef1c.<\/td><td>Ph\u1ea7n t\u1eed ch\u00ednh c\u00f3 th\u1ec3 l\u00e0 c\u00e1p, thanh c\u00e1i ho\u1eb7c m\u1ed9t d\u00e2y qu\u1ea5n chuy\u00ean d\u1ee5ng.<\/td><\/tr><tr><td>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng<\/td><td>Trong m\u1ed9t m\u00e1y bi\u1ebfn d\u00f2ng l\u00fd t\u01b0\u1edfng, s\u1ed1 AT s\u01a1 c\u1ea5p b\u1eb1ng s\u1ed1 AT th\u1ee9 c\u1ea5p.<\/td><td>N\u1ebfu m\u1ed9t m\u00e1y bi\u1ebfn d\u00f2ng thanh d\u1eabn c\u00f3 m\u1ed9t v\u00f2ng d\u00e2y s\u01a1 c\u1ea5p v\u00e0 200 v\u00f2ng d\u00e2y th\u1ee9 c\u1ea5p, d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p 1.000 A theo l\u00fd t\u01b0\u1edfng s\u1ebd t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p 5 A.<\/td><\/tr><tr><td>C\u1ea5u t\u1ea1o bi\u1ebfn d\u00f2ng \u0111i\u1ec7n<\/td><td>C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh g\u1ed3m c\u00f3 l\u00f5i t\u1eeb, cu\u1ed9n th\u1ee9 c\u1ea5p c\u00e1ch \u0111i\u1ec7n, \u0111\u01b0\u1eddng d\u1eabn d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p, c\u00e1c c\u1ef1c, h\u1ec7 th\u1ed1ng c\u00e1ch \u0111i\u1ec7n v\u00e0 v\u1ecf b\u1ecdc.<\/td><td>V\u1eadt li\u1ec7u l\u00f5i v\u00e0 ti\u1ebft di\u1ec7n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n t\u1eeb h\u00f3a v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng b\u00e3o h\u00f2a.<\/td><\/tr><tr><td>C\u00e1c lo\u1ea1i m\u00e1y bi\u1ebfn d\u00f2ng ch\u00ednh<\/td><td>Bi\u1ebfn d\u00f2ng c\u1eeda s\u1ed5 c\u00f3 m\u1ed9t l\u1ed7 m\u1edf \u0111\u1ec3 c\u00e1p ho\u1eb7c thanh c\u00e1i \u0111i qua.<\/td><td>D\u00e2y d\u1eabn \u0111\u00f3 t\u1ea1o th\u00e0nh m\u1ed9t cu\u1ed9n s\u01a1 c\u1ea5p m\u1ed9t v\u00f2ng.<\/td><\/tr><tr><td>BI \u0111o l\u01b0\u1eddng so v\u1edbi BI b\u1ea3o v\u1ec7<\/td><td>Bi\u1ebfn d\u00f2ng \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ed9 ch\u00ednh x\u00e1c xung quanh t\u1ea3i b\u00ecnh th\u01b0\u1eddng v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 b\u00e3o h\u00f2a tr\u01b0\u1edbc khi d\u00f2ng s\u1ef1 c\u1ed1 qu\u00e1 m\u1ee9c \u0111\u1ebfn \u0111\u01b0\u1ee3c c\u00e1c thi\u1ebft b\u1ecb \u0111o \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i.<\/td><td>Bi\u1ebfn d\u00f2ng b\u1ea3o v\u1ec7 ph\u1ea3i t\u00e1i t\u1ea1o d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 cao v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ee7 \u0111\u1ec3 r\u01a1-le ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng.<\/td><\/tr><\/tbody><\/table><\/figure><\/section><h2>C\u1ea5u t\u1ea1o bi\u1ebfn d\u00f2ng \u0111i\u1ec7n<\/h2>\n<p>C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh l\u00e0 l\u00f5i t\u1eeb, cu\u1ed9n d\u00e2y th\u1ee9 c\u1ea5p c\u00e1ch \u0111i\u1ec7n, \u0111\u01b0\u1eddng d\u1eabn d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p, c\u00e1c \u0111\u1ea7u c\u1ef1c, h\u1ec7 th\u1ed1ng c\u00e1ch \u0111i\u1ec7n v\u00e0 v\u1ecf b\u1ecdc. V\u1eadt li\u1ec7u l\u00f5i v\u00e0 ti\u1ebft di\u1ec7n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n t\u1eeb h\u00f3a v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng b\u00e3o h\u00f2a. Cu\u1ed9n d\u00e2y th\u1ee9 c\u1ea5p s\u1eed d\u1ee5ng nhi\u1ec1u v\u00f2ng d\u1eabn \u0111i\u1ec7n b\u1eb1ng \u0111\u1ed3ng \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 \u0111\u1ec3 ki\u1ec3m so\u00e1t t\u1eeb th\u00f4ng r\u00f2. C\u00e1c bi\u1ebfn d\u00f2ng trung th\u1ebf c\u0169ng y\u00eau c\u1ea7u m\u1ed9t h\u1ec7 th\u1ed1ng c\u00e1ch \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho \u0111i\u1ec7n \u00e1p m\u1ea1ng l\u01b0\u1edbi v\u00e0 m\u1ee9c xung.<\/p>\n<p>M\u1ed9t s\u1ed1 bi\u1ebfn d\u00f2ng (CT) trong t\u1ee7 \u0111i\u1ec7n c\u00f3 ch\u1ee9a nhi\u1ec1u l\u00f5i. M\u1ed9t l\u00f5i c\u00f3 th\u1ec3 cung c\u1ea5p cho thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng doanh thu ho\u1eb7c v\u1eadn h\u00e0nh, trong khi c\u00e1c l\u00f5i b\u1ea3o v\u1ec7 ri\u00eang bi\u1ec7t cung c\u1ea5p cho c\u00e1c r\u01a1-le qu\u00e1 d\u00f2ng, ch\u1ea1m \u0111\u1ea5t ho\u1eb7c so l\u1ec7ch. M\u1ed7i l\u00f5i c\u00f3 t\u1ef7 s\u1ed1 bi\u1ebfn d\u00f2ng, c\u1ea5p ch\u00ednh x\u00e1c v\u00e0 g\u00e1nh (burden) ri\u00eang c\u1ee7a m\u00ecnh v\u00e0 ch\u1ec9 \u0111\u01b0\u1ee3c \u0111\u1ea5u n\u1ed1i v\u1edbi m\u1ea1ch \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh cho n\u00f3.<\/p>\n<h2>C\u00e1c lo\u1ea1i m\u00e1y bi\u1ebfn d\u00f2ng ch\u00ednh<\/h2>\n<h3>Bi\u1ebfn d\u00f2ng d\u1ea1ng c\u1eeda s\u1ed5 ho\u1eb7c d\u1ea1ng v\u00f2ng<\/h3>\n<p>Bi\u1ebfn d\u00f2ng d\u1ea1ng c\u1eeda s\u1ed5 c\u00f3 m\u1ed9t l\u1ed7 m\u1edf \u0111\u1ec3 c\u00e1p ho\u1eb7c thanh c\u00e1i \u0111i qua. D\u00e2y d\u1eabn \u0111\u00f3 t\u1ea1o th\u00e0nh m\u1ed9t cu\u1ed9n s\u01a1 c\u1ea5p m\u1ed9t v\u00f2ng. K\u1ebft c\u1ea5u nh\u1ecf g\u1ecdn, d\u1ec5 l\u1eafp \u0111\u1eb7t v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c t\u1ee7 \u0111i\u1ec7n. Bi\u1ebfn d\u00f2ng l\u00f5i t\u00e1ch c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t xung quanh m\u1ed9t d\u00e2y d\u1eabn hi\u1ec7n h\u1eefu \u0111\u1ec3 gi\u00e1m s\u00e1t, nh\u01b0ng c\u00e1c l\u00f5i c\u00f3 kh\u1edbp n\u1ed1i c\u00f3 th\u1ec3 c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00e1c nhau v\u00e0 kh\u00f4ng n\u00ean m\u1eb7c nhi\u00ean cho l\u00e0 ph\u00f9 h\u1ee3p cho m\u1ee5c \u0111\u00edch b\u1ea3o v\u1ec7 n\u1ebfu ch\u01b0a \u0111\u01b0\u1ee3c ki\u1ec3m ch\u1ee9ng.<\/p>\n<h3>Bi\u1ebfn d\u00f2ng s\u01a1 c\u1ea5p thanh c\u00e1i<\/h3>\n<p>M\u1ed9t m\u00e1y bi\u1ebfn d\u00f2ng d\u1ea1ng thanh c\u00e1i (bar CT) bao g\u1ed3m m\u1ed9t d\u00e2y d\u1eabn ch\u00ednh c\u1ed1 \u0111\u1ecbnh xuy\u00ean qua l\u00f5i c\u1ee7a n\u00f3. C\u00e1c \u0111\u1ea7u c\u1ef1c k\u1ebft n\u1ed1i thanh c\u00e1i tr\u1ef1c ti\u1ebfp v\u00e0o m\u1ea1ch \u0111i\u1ec7n. N\u00f3 cung c\u1ea5p c\u1ea5u tr\u00fac c\u01a1 v\u00e0 \u0111i\u1ec7n c\u00f3 ki\u1ec3m so\u00e1t cho thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft nh\u01b0ng ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng \u0111i\u1ec7n li\u00ean t\u1ee5c v\u00e0 l\u1ef1c ng\u1eafn m\u1ea1ch.<\/p>\n<h3>Bi\u1ebfn d\u00f2ng s\u01a1 c\u1ea5p ki\u1ec3u thanh d\u1eabn<\/h3>\n<p>M\u00e1y bi\u1ebfn d\u00f2ng s\u01a1 c\u1ea5p nhi\u1ec1u v\u00f2ng c\u00f3 m\u1ed9t s\u1ed1 v\u00f2ng s\u01a1 c\u1ea5p ch\u00ednh v\u00e0 h\u1eefu \u00edch cho c\u00e1c t\u1ef7 l\u1ec7 d\u00f2ng s\u01a1 c\u1ea5p th\u1ea5p h\u01a1n, n\u01a1i m\u00e0 m\u1ed9t v\u00f2ng s\u01a1 c\u1ea5p \u0111\u01a1n l\u1ebb kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t ph\u00f9 h\u1ee3p. C\u1ea3 cu\u1ed9n s\u01a1 c\u1ea5p v\u00e0 cu\u1ed9n th\u1ee9 c\u1ea5p \u0111\u1ec1u y\u00eau c\u1ea7u c\u00e1ch \u0111i\u1ec7n v\u00e0 c\u00e1c \u0111\u1ea7u n\u1ed1i, l\u00e0m cho c\u1ea5u tr\u00fac tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p h\u01a1n.<\/p>\n<h3>Bi\u1ebfn d\u00f2ng d\u1ea1ng s\u1ee9 v\u00e0 d\u1ea1ng c\u00e1p<\/h3>\n<p>Bi\u1ebfn d\u00f2ng d\u1ea1ng s\u1ee9 (bushing CT) \u0111\u01b0\u1ee3c l\u1eafp xung quanh s\u1ee9 c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p ho\u1eb7c m\u00e1y c\u1eaft. Bi\u1ebfn d\u00f2ng d\u1ea1ng c\u00e1p (cable CTs) \u0111\u01b0\u1ee3c l\u1eafp xung quanh c\u00e1p \u0111i\u1ec7n v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o d\u00f2ng \u0111i\u1ec7n pha ho\u1eb7c d\u00f2ng \u0111i\u1ec7n ch\u1ea1m \u0111\u1ea5t. Bi\u1ebfn d\u00f2ng c\u00e2n b\u1eb1ng l\u00f5i (core-balance CT) bao quanh t\u1ea5t c\u1ea3 c\u00e1c d\u00e2y d\u1eabn pha sao cho t\u1ed5ng d\u00f2ng \u0111i\u1ec7n v\u00e9c-t\u01a1 b\u00ecnh th\u01b0\u1eddng g\u1ea7n b\u1eb1ng kh\u00f4ng; d\u00f2ng \u0111i\u1ec7n d\u01b0 xu\u1ea5t hi\u1ec7n trong s\u1ef1 c\u1ed1 ch\u1ea1m \u0111\u1ea5t.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Three ring current transformers installed around switchgear power cables\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/ring-current-transformers.png\"\/><figcaption>Bi\u1ebfn d\u00f2ng d\u1ea1ng c\u1eeda s\u1ed5 v\u00e0 d\u1ea1ng v\u00f2ng \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t xung quanh m\u1ed9t thanh c\u00e1i ho\u1eb7c c\u00e1p t\u1ea1o th\u00e0nh d\u00e2y d\u1eabn s\u01a1 c\u1ea5p.<\/figcaption><\/figure>\n<h2>BI \u0111o l\u01b0\u1eddng so v\u1edbi BI b\u1ea3o v\u1ec7<\/h2>\n<p>Bi\u1ebfn d\u00f2ng \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c xung quanh t\u1ea3i b\u00ecnh th\u01b0\u1eddng v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 b\u00e3o h\u00f2a tr\u01b0\u1edbc khi d\u00f2ng s\u1ef1 c\u1ed1 qu\u00e1 m\u1ee9c \u0111\u1ebfn \u0111\u01b0\u1ee3c c\u00e1c thi\u1ebft b\u1ecb \u0111o. Bi\u1ebfn d\u00f2ng b\u1ea3o v\u1ec7 ph\u1ea3i t\u00e1i t\u1ea1o d\u00f2ng s\u1ef1 c\u1ed1 l\u1edbn m\u1ed9t c\u00e1ch \u0111\u1ee7 ch\u00ednh x\u00e1c \u0111\u1ec3 r\u01a1-le ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. Do \u0111\u00f3, \u0111i\u1ec7n \u00e1p \u0111i\u1ec3m khu\u1ef7u, \u0111\u01b0\u1eddng \u0111\u1eb7c t\u00ednh t\u1eeb h\u00f3a ho\u1eb7c c\u1ea5p sai s\u1ed1 t\u1ed5ng h\u1ee3p c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 quan tr\u1ecdng h\u01a1n \u0111\u1ed9 ch\u00ednh x\u00e1c tinh vi \u1edf t\u1ea3i b\u00ecnh th\u01b0\u1eddng.<\/p>\n<p>Kh\u00f4ng \u0111\u1eb7t r\u01a1-le b\u1ea3o v\u1ec7 v\u00e0 \u0111\u1ed3ng h\u1ed3 \u0111o \u0111\u1ed9 ch\u00ednh x\u00e1c tr\u00ean c\u00f9ng m\u1ed9t l\u00f5i tr\u1eeb khi thi\u1ebft k\u1ebf th\u1ec3 hi\u1ec7n r\u00f5 r\u00e0ng r\u1eb1ng g\u00e1nh n\u1eb7ng v\u00e0 \u0111\u1ed9 b\u00e3o h\u00f2a \u0111\u00e1p \u1ee9ng c\u1ea3 hai y\u00eau c\u1ea7u. C\u00e1c l\u00f5i ri\u00eang bi\u1ec7t gi\u00fap hi\u1ec7u su\u1ea5t v\u00e0 vi\u1ec7c ki\u1ec3m tra tr\u1edf n\u00ean r\u00f5 r\u00e0ng h\u01a1n.<\/p>\n<h2>Hi\u1ec3u v\u1ec1 t\u1ef7 l\u1ec7 CT<\/h2>\n<p>T\u1ef7 l\u1ec7 ch\u1eb3ng h\u1ea1n nh\u01b0 600\/5 A ngh\u0129a l\u00e0 d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p 600 A t\u01b0\u01a1ng \u1ee9ng v\u1edbi d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p 5 A v\u1ec1 m\u1eb7t danh \u0111\u1ecbnh. T\u1ef7 l\u1ec7 n\u00e0y l\u00e0 120:1. N\u1ebfu m\u1ea1ch th\u1ee9 c\u1ea5p \u0111o \u0111\u01b0\u1ee3c 3 A, d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p hi\u1ec3n th\u1ecb l\u00e0 kho\u1ea3ng 360 A tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng c\u00e1c hi\u1ec7u ch\u1ec9nh thi\u1ebft b\u1ecb \u0111o.<\/p>\n<p>D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c s\u01a1 c\u1ea5p \u0111\u01b0\u1ee3c ch\u1ecdn ph\u1ea3i \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c t\u1ea3i li\u00ean t\u1ee5c t\u1ed1i \u0111a d\u1ef1 ki\u1ebfn m\u00e0 kh\u00f4ng l\u00e0m cho d\u00f2ng \u0111i\u1ec7n l\u00e0m vi\u1ec7c b\u00ecnh th\u01b0\u1eddng tr\u1edf n\u00ean qu\u00e1 nh\u1ecf so v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c h\u1eefu \u00edch. C\u00e1c bi\u1ebfn d\u00f2ng (CT) nhi\u1ec1u t\u1ef7 l\u1ec7 cung c\u1ea5p c\u00e1c \u0111\u1ea7u v\u00f2i (tap), nh\u01b0ng c\u00e1c \u0111\u1ea7u c\u1ef1c kh\u00f4ng s\u1eed d\u1ee5ng v\u00e0 t\u1ef7 l\u1ec7 k\u1ebft n\u1ed1i th\u1ef1c t\u1ebf ph\u1ea3i \u0111\u01b0\u1ee3c l\u1eadp t\u00e0i li\u1ec7u r\u00f5 r\u00e0ng.<\/p>\n<h2>C\u1ea5p ch\u00ednh x\u00e1c, G\u00e1nh n\u1eb7ng v\u00e0 B\u00e3o h\u00f2a<\/h2>\n<p>T\u1ea3i \u0111\u1ecbnh m\u1ee9c l\u00e0 t\u1ed5ng tr\u1edf ho\u1eb7c t\u1ea3i VA \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi cu\u1ed9n th\u1ee9 c\u1ea5p \u1edf d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c. N\u00f3 bao g\u1ed3m \u0111i\u1ec7n k\u1ebf ho\u1eb7c r\u01a1-le, c\u00f4ng t\u1eafc th\u1eed nghi\u1ec7m, c\u00e1c \u0111\u1ea7u c\u1ef1c v\u00e0 \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn. T\u1ea3i \u0111\u1ecbnh m\u1ee9c qu\u00e1 m\u1ee9c l\u00e0m t\u0103ng sai s\u1ed1 v\u00e0 c\u00f3 th\u1ec3 g\u00e2y b\u00e3o h\u00f2a s\u1edbm h\u01a1n. Cu\u1ed9n th\u1ee9 c\u1ea5p 1 A th\u01b0\u1eddng l\u00e0m gi\u1ea3m t\u1ea3i d\u00e2y d\u1eabn tr\u00ean c\u00e1c tuy\u1ebfn c\u00e1p d\u00e0i v\u00ec t\u1ed5n th\u1ea5t c\u00f4ng su\u1ea5t thay \u0111\u1ed5i theo b\u00ecnh ph\u01b0\u01a1ng d\u00f2ng \u0111i\u1ec7n.<\/p>\n<p>C\u00e1c c\u1ea5p ch\u00ednh x\u00e1c \u0111o l\u01b0\u1eddng quy \u0111\u1ecbnh sai s\u1ed1 t\u1ef7 s\u1ed1 v\u00e0 pha cho ph\u00e9p trong m\u1ed9t d\u1ea3i d\u00f2ng \u0111i\u1ec7n. C\u00e1c c\u1ea5p b\u1ea3o v\u1ec7 quy \u0111\u1ecbnh hi\u1ec7u su\u1ea5t \u1edf d\u00f2ng \u0111i\u1ec7n gi\u1edbi h\u1ea1n ch\u00ednh x\u00e1c \u0111\u1ecbnh m\u1ee9c ho\u1eb7c x\u00e1c \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111i\u1ec3m u\u1ed1n v\u00e0 \u0111i\u1ec7n tr\u1edf cu\u1ed9n d\u00e2y th\u1ee9 c\u1ea5p. C\u00e1c ti\u00eau chu\u1ea9n s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u c\u1ea5p kh\u00e1c nhau, do \u0111\u00f3 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt mua h\u00e0ng ph\u1ea3i tr\u00edch d\u1eabn phi\u00ean b\u1ea3n hi\u1ec7n h\u00e0nh v\u00e0 c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 - ch\u1ee9 kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t con s\u1ed1.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Current transformers connected to factory ratio and accuracy test equipment\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/current-transformer-accuracy-testing.png\"\/><figcaption>Sai s\u1ed1 t\u1ef7 s\u1ed1, sai s\u1ed1 pha, g\u00e1nh n\u1eb7ng v\u00e0 \u0111\u1eb7c t\u00ednh t\u1eeb h\u00f3a ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec7m v\u1ee5 \u0111o l\u01b0\u1eddng ho\u1eb7c b\u1ea3o v\u1ec7.<\/figcaption><\/figure>\n<h2>C\u00e1ch ch\u1ecdn k\u00edch th\u01b0\u1edbc Bi\u1ebfn d\u00f2ng<\/h2>\n<ol>\n<li>X\u00e1c nh\u1eadn \u0111i\u1ec7n \u00e1p t\u1ed1i \u0111a c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 m\u1ee9c c\u00e1ch \u0111i\u1ec7n y\u00eau c\u1ea7u.<\/li>\n<li>T\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n b\u00ecnh th\u01b0\u1eddng, d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u00e0 d\u00f2ng \u0111i\u1ec7n c\u1ef1c \u0111\u1ea1i trong t\u01b0\u01a1ng lai.<\/li>\n<li>Ch\u1ecdn m\u1ed9t t\u1ef7 l\u1ec7 ch\u00ednh ti\u00eau chu\u1ea9n cung c\u1ea5p \u0111\u1ed9 ph\u00e2n gi\u1ea3i h\u1eefu \u00edch m\u00e0 kh\u00f4ng b\u1ecb qu\u00e1 t\u1ea3i.<\/li>\n<li>Ch\u1ecdn d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p 1 A ho\u1eb7c 5 A \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi r\u01a1-le, \u0111\u1ed3ng h\u1ed3 \u0111o v\u00e0 kho\u1ea3ng c\u00e1ch \u0111i d\u00e2y.<\/li>\n<li>T\u00ednh to\u00e1n t\u1ed5ng t\u1ea3i t\u1eeb c\u00e1c thi\u1ebft b\u1ecb v\u00e0 \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn.<\/li>\n<li>Ch\u1ecdn c\u1ea5p ch\u00ednh x\u00e1c \u0111o l\u01b0\u1eddng ho\u1eb7c b\u1ea3o v\u1ec7 d\u1ef1a tr\u00ean \u1ee9ng d\u1ee5ng v\u00e0 ti\u00eau chu\u1ea9n qu\u1ea3n l\u00fd.<\/li>\n<li>Ki\u1ec3m tra kh\u1ea3 n\u0103ng ch\u1ecbu d\u00f2ng \u0111i\u1ec7n ng\u1eafn h\u1ea1n v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ed9ng l\u1ef1c \u0111\u1ed1i v\u1edbi nghi\u00ean c\u1ee9u s\u1ef1 c\u1ed1.<\/li>\n<li>X\u00e1c nh\u1eadn k\u00edch th\u01b0\u1edbc c\u1eeda s\u1ed5, b\u1ed1 tr\u00ed d\u00e2y d\u1eabn, c\u00e1c \u0111\u1ea7u c\u1ef1c, c\u1ef1c t\u00ednh v\u00e0 c\u00e1ch l\u1eafp \u0111\u1eb7t.<\/li>\n<\/ol>\n<h2>Bi\u1ebfn d\u00f2ng trong b\u1ea3o v\u1ec7 t\u1ee7 \u0111i\u1ec7n v\u00e0 m\u00e1y bi\u1ebfn \u00e1p<\/h2>\n<p>Trong <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/kyn28a-12-armouring-removable-ac-metal-enclosed-switchgear\/\">T\u1ee7 \u0111i\u1ec7n trung th\u1ebf KYN28A-12<\/a>, c\u00e1c CT cung c\u1ea5p ch\u1ee9c n\u0103ng \u0111o l\u01b0\u1eddng v\u00e0 b\u1ea3o v\u1ec7 nh\u00e1nh r\u1ebd xung quanh \u0111\u01b0\u1eddng c\u00e1p ho\u1eb7c thanh c\u00e1i. C\u00e1c t\u1ed5 h\u1ee3p \u0111i\u1ec7n \u00e1p cao h\u01a1n ch\u1eb3ng h\u1ea1n nh\u01b0 <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/kyn61-40-5-armouring-removable-ac-metal-enclosed-switchgear\/\">T\u1ee7 \u0111i\u1ec7n trung th\u1ebf KYN61-40.5<\/a> y\u00eau c\u1ea7u c\u00e1ch \u0111i\u1ec7n v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng ph\u00f9 h\u1ee3p v\u1edbi c\u1ea5p \u0111i\u1ec7n \u00e1p.<\/p>\n<p>B\u1ea3o v\u1ec7 so l\u1ec7ch m\u00e1y bi\u1ebfn \u00e1p so s\u00e1nh d\u00f2ng \u0111i\u1ec7n \u1edf m\u1ed7i ph\u00eda sau khi t\u00ednh to\u00e1n t\u1ef7 s\u1ed1 v\u00e0 \u0111\u1ed9 l\u1ec7ch pha c\u1ee7a nh\u00f3m \u0111\u1ea5u d\u00e2y. T\u1ef7 s\u1ed1, c\u1ef1c t\u00ednh, \u0111\u1ed9 b\u00e3o h\u00f2a c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng (CT) v\u00e0 b\u00f9 c\u1ee7a r\u01a1-le \u0111\u1ec1u ph\u1ea3i \u0111\u01b0\u1ee3c ph\u1ed1i h\u1ee3p v\u1edbi nhau. \u0110\u1ed1i v\u1edbi m\u1ed9t d\u1ef1 \u00e1n s\u1eed d\u1ee5ng <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/s-m-35kv-oil-immersed-power-transformer\/\">M\u00e1y bi\u1ebfn \u00e1p ng\u00e2m d\u1ea7u 35 kV<\/a>, the transformer data and fault study should be supplied with the switchgear CT schedule. For a separate distribution-transformer example and its single-phase ratings, see the <a href=\"https:\/\/lbajiele.com\/vi\/blog\/single-phase-transformer-guide\/\">single-phase transformer fundamentals guide<\/a>. For residual-current sensing and relay matching, see the <a href=\"https:\/\/lbajiele.com\/vi\/blog\/what-is-core-balance-current-transformer\/\">core balance CT selection guide<\/a>.<\/p>\n<h2>Danh m\u1ee5c ki\u1ec3m tra l\u1eafp \u0111\u1eb7t v\u00e0 th\u1eed nghi\u1ec7m<\/h2>\n<ul>\n<li>X\u00e1c minh t\u1ef7 s\u1ed1, c\u1ea5p ch\u00ednh x\u00e1c, g\u00e1nh n\u1eb7ng v\u00e0 k\u00fd hi\u1ec7u \u0111\u1ea7u c\u1ef1c c\u1ee7a nh\u00e3n m\u00e1y.<\/li>\n<li>X\u00e1c nh\u1eadn c\u1ef1c t\u00ednh P1\/P2 v\u00e0 S1\/S2 so v\u1edbi b\u1ea3n v\u1ebd b\u1ea3o v\u1ec7.<\/li>\n<li>N\u1ed1i \u0111\u1ea5t m\u1ea1ch th\u1ee9 c\u1ea5p t\u1ea1i m\u1ed9t \u0111i\u1ec3m \u0111\u01a1n \u0111\u00e3 \u0111\u1ecbnh.<\/li>\n<li>Ki\u1ec3m tra xem t\u1ea5t c\u1ea3 c\u00e1c d\u00e2y d\u1eabn ch\u00ednh c\u00f3 \u0111i qua m\u00e1y bi\u1ebfn d\u00f2ng c\u00e2n b\u1eb1ng l\u00f5i theo \u0111\u00fang h\u01b0\u1edbng hay kh\u00f4ng.<\/li>\n<li>Th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p th\u1eed t\u1ef7 s\u1ed1, c\u1ef1c t\u00ednh, c\u00e1ch \u0111i\u1ec7n v\u00e0 d\u00f2ng k\u00edch th\u00edch nh\u01b0 \u0111\u00e3 quy \u0111\u1ecbnh.<\/li>\n<li>Ki\u1ec3m ch\u1ee9ng d\u00f2ng phun th\u1ee9 c\u1ea5p v\u00e0 to\u00e0n b\u1ed9 chu\u1ed7i t\u00e1c \u0111\u1ed9ng t\u1eeb r\u01a1-le \u0111\u1ebfn m\u00e1y c\u1eaft.<\/li>\n<li>Gi\u1eef cho c\u00e1c m\u1ea1ch th\u1ee9 c\u1ea5p \u0111\u01b0\u1ee3c n\u1ed1i t\u1eaft tr\u01b0\u1edbc khi ng\u1eaft k\u1ebft n\u1ed1i thi\u1ebft b\u1ecb \u0111\u00e3 k\u1ebft n\u1ed1i.<\/li>\n<\/ul>\n<h2>M\u00e1y bi\u1ebfn d\u00f2ng (CT) c\u00f3 \u0111o \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u (DC) kh\u00f4ng?<\/h2>\n<p>Bi\u1ebfn d\u00f2ng t\u1eeb t\u00ednh th\u00f4ng th\u01b0\u1eddng y\u00eau c\u1ea7u t\u1eeb th\u00f4ng xoay chi\u1ec1u v\u00e0 kh\u00f4ng th\u1ec3 \u0111o d\u00f2ng m\u1ed9t chi\u1ec1u (DC) t\u0129nh. Vi\u1ec7c \u0111o d\u00f2ng \u0111i\u1ec7n DC s\u1eed d\u1ee5ng c\u1ea3m bi\u1ebfn hi\u1ec7u \u1ee9ng Hall, b\u1ed9 chuy\u1ec3n \u0111\u1ed5i c\u1ed5ng t\u1eeb (fluxgate) ho\u1eb7c \u0111i\u1ec7n tr\u1edfshunt. M\u1ed9t thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c th\u01b0\u01a1ng m\u1ea1i h\u00f3a l\u00e0 \u201cbi\u1ebfn d\u00f2ng m\u1ed9t chi\u1ec1u\u201d th\u01b0\u1eddng s\u1eed d\u1ee5ng c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed ch\u1ee7 \u0111\u1ed9ng v\u00e0 n\u00ean \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 h\u00f3a b\u1eb1ng b\u0103ng th\u00f4ng, \u0111\u1ed9 ch\u00ednh x\u00e1c, kh\u1ea3 n\u0103ng c\u00e1ch ly v\u00e0 nhu c\u1ea7u ngu\u1ed3n ph\u1ee5 tr\u1ee3 c\u1ee7a n\u00f3.<\/p>\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list\">\n<\/div>\n<\/div>\n<!-- lbaji-dataforseo-gaps:start -->\n<section class=\"lbaji-serp-gap\"><h2>G\u00e1nh n\u1eb7ng, \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u0111i\u1ec3m u\u1ed1n c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng (CT)<\/h2><p>T\u1ea3i tr\u1ecdng c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng (CT burden) l\u00e0 t\u1ed5ng tr\u1edf kh\u00e1ng c\u1ee7a c\u00e1c \u0111i\u1ec7n k\u1ebf, r\u01a1-le, d\u00e2y d\u1eabn v\u00e0 c\u00e1c \u0111\u1ea7u c\u1ecdc. T\u1ea3i tr\u1ecdng d\u01b0 th\u1eeba l\u00e0m t\u0103ng sai s\u1ed1 v\u00e0 c\u00f3 th\u1ec3 \u0111\u1ea9y l\u00f5i th\u00e9p v\u00e0o tr\u1ea1ng th\u00e1i b\u00e3o h\u00f2a. C\u00e1c CT \u0111o l\u01b0\u1eddng ch\u00fa tr\u1ecdng \u0111\u1ed9 ch\u00ednh x\u00e1c \u1edf d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c b\u00ecnh th\u01b0\u1eddng; c\u00e1c CT b\u1ea3o v\u1ec7 ph\u1ea3i t\u00e1i t\u1ea1o l\u1ea1i d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 l\u1edbn \u0111\u1ee7 l\u00e2u \u0111\u1ec3 r\u01a1-le ho\u1ea1t \u0111\u1ed9ng. D\u1eef li\u1ec7u v\u1ec1 \u0111i\u1ec3m g\u1ed1i (knee-point) ho\u1eb7c d\u1eef li\u1ec7u t\u1eeb h\u00f3a \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c s\u01a1 \u0111\u1ed3 tr\u1edf kh\u00e1ng cao v\u00e0 so l\u1ec7ch.<\/p><\/section>\n<section class=\"lbaji-serp-gap\"><h2>C\u1ef1c t\u00ednh c\u1ee7a bi\u1ebfn d\u00f2ng (CT) v\u00e0 an to\u00e0n ph\u00eda th\u1ee9 c\u1ea5p<\/h2><p>C\u00e1c d\u1ea5u ph\u00e2n c\u1ef1c x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi c\u00e1c ch\u1ee9c n\u0103ng c\u00f4ng su\u1ea5t, vi sai v\u00e0 \u0111\u1ecbnh h\u01b0\u1edbng. X\u00e1c minh vi\u1ec7c nh\u1eadn di\u1ec7n \u0111\u1ea7u c\u1ef1c v\u00e0 vi\u1ec7c n\u1ed1i \u0111\u1ea5t th\u1ee9 b\u1ea3n \u0111i\u1ec3m \u0111\u01a1n so v\u1edbi b\u1ea3n v\u1ebd \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t. Kh\u00f4ng bao gi\u1edd \u0111\u1ec3 h\u1edf m\u1ea1ch th\u1ee9 c\u1ea5p c\u1ee7a m\u00e1y bi\u1ebfn d\u00f2ng (CT) \u0111ang mang \u0111i\u1ec7n: t\u1eeb th\u00f4ng l\u00f5i v\u00e0 \u0111i\u1ec7n \u00e1p th\u1ee9 c\u1ea5p c\u00f3 th\u1ec3 t\u0103ng l\u00ean m\u1ee9c nguy hi\u1ec3m. S\u1eed d\u1ee5ng c\u00e1c \u0111\u1ea7u n\u1ed1i ng\u1eafn m\u1ea1ch tr\u01b0\u1edbc khi th\u00e1o r\u01a1-le ho\u1eb7c \u0111\u1ed3ng h\u1ed3 \u0111o.<\/p><\/section>\n<!-- lbaji-dataforseo-gaps:end -->\n<!-- lbaji-references:start -->\n<section aria-labelledby=\"technical-references-heading\" class=\"lbaji-technical-references\">\n<h2 id=\"technical-references-heading\">T\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt v\u00e0 \u0111\u1ecdc th\u00eam<\/h2>\n<p>C\u00e1c ngu\u1ed3n \u0111\u1ed9c l\u1eadp sau \u0111\u00e2y h\u1ed7 tr\u1ee3 c\u00e1c ti\u00eau chu\u1ea9n, thu\u1eadt ng\u1eef, ph\u00e9p t\u00ednh v\u00e0 b\u1ed1i c\u1ea3nh an to\u00e0n \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn trong h\u01b0\u1edbng d\u1eabn n\u00e0y:<\/p>\n<ul><li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/588\" rel=\"noopener nofollow\" target=\"_blank\">Ti\u00eau chu\u1ea9n m\u00e1y bi\u1ebfn \u00e1p l\u1ef1c IEC 60076-1<\/a> \u2014 Ph\u1ea1m vi, thu\u1eadt ng\u1eef, \u0111\u1ecbnh m\u1ee9c, k\u00fd hi\u1ec7u k\u1ebft n\u1ed1i, th\u1eed nghi\u1ec7m, an to\u00e0n v\u00e0 c\u00e1c y\u00eau c\u1ea7u chung \u0111\u1ed1i v\u1edbi m\u00e1y bi\u1ebfn \u00e1p l\u1ef1c.<\/li>\n<li><a href=\"https:\/\/www.energy.gov\/cmei\/buildings\/distribution-transformers\" rel=\"noopener nofollow\" target=\"_blank\">B\u1ed9 N\u0103ng l\u01b0\u1ee3ng Hoa K\u1ef3: M\u00e1y bi\u1ebfn \u00e1p ph\u00e2n ph\u1ed1i<\/a> \u2014 C\u00e1c \u0111\u1ecbnh ngh\u0129a ch\u00ednh th\u1ee9c, y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t, quy tr\u00ecnh th\u1eed nghi\u1ec7m v\u00e0 t\u00e0i li\u1ec7u quy \u0111\u1ecbnh \u0111\u1ed1i v\u1edbi m\u00e1y bi\u1ebfn \u00e1p ph\u00e2n ph\u1ed1i.<\/li>\n<li><a href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1926\/1926SubpartV\" rel=\"noopener nofollow\" target=\"_blank\">c\u00e1c y\u00eau c\u1ea7u v\u1ec1 truy\u1ec1n t\u1ea3i v\u00e0 ph\u00e2n ph\u1ed1i \u0111i\u1ec7n n\u0103ng c\u1ee7a OSHA<\/a> \u2014 C\u00e1c y\u00eau c\u1ea7u v\u1ec1 an to\u00e0n li\u00ean quan \u0111\u1ebfn x\u00e2y d\u1ef1ng v\u00e0 c\u00f4ng vi\u1ec7c xung quanh thi\u1ebft b\u1ecb truy\u1ec1n t\u1ea3i v\u00e0 ph\u00e2n ph\u1ed1i \u0111i\u1ec7n n\u0103ng.<\/li><\/ul>\n<\/section>\n<!-- lbaji-references:end -->","protected":false},"excerpt":{"rendered":"<p>M\u00e1y bi\u1ebfn d\u00f2ng (CT) chuy\u1ec3n \u0111\u1ed5i d\u00f2ng \u0111i\u1ec7n ch\u00ednh l\u1edbn th\u00e0nh d\u00f2ng \u0111i\u1ec7n th\u1ee9 c\u1ea5p nh\u1ecf h\u01a1n, ti\u00eau chu\u1ea9n h\u00f3a, m\u00e0 c\u00e1c thi\u1ebft b\u1ecb \u0111o v\u00e0 r\u01a1le b\u1ea3o v\u1ec7 c\u00f3 th\u1ec3 \u0111o ch\u00ednh x\u00e1c. S\u1ef1 \u0111\u01a1n gi\u1ea3n b\u1ec1 ngo\u00e0i c\u1ee7a n\u00f3 \u1ea9n ch\u1ee9a nh\u1eefng l\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf quan tr\u1ecdng:\u2026<\/p>","protected":false},"author":6,"featured_media":2411,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[52],"tags":[61,60,79,65],"class_list":["post-2415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-transformers","tag-distribution-transformer","tag-power-transformer","tag-relays-busbars","tag-transformer-sizing"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2415","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/comments?post=2415"}],"version-history":[{"count":10,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2415\/revisions"}],"predecessor-version":[{"id":3709,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2415\/revisions\/3709"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media\/2411"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media?parent=2415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/categories?post=2415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/tags?post=2415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}