{"id":2891,"date":"2026-08-29T12:42:00","date_gmt":"2026-08-29T12:42:00","guid":{"rendered":"https:\/\/lbajiele.com\/?p=2891"},"modified":"2026-08-25T12:10:17","modified_gmt":"2026-08-25T12:10:17","slug":"3-phase-transformer-calculations-calculator-and-formula-guide","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/vi\/blog\/3-phase-transformer-calculations-calculator-and-formula-guide\/","title":{"rendered":"T\u00ednh to\u00e1n m\u00e1y bi\u1ebfn \u00e1p ba pha: C\u00f4ng th\u1ee9c &amp; V\u00ed d\u1ee5"},"content":{"rendered":"<p><strong>C\u00e1c ph\u00e9p t\u00ednh m\u00e1y bi\u1ebfn \u00e1p ba pha s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c kVA = \u221a3 \u00d7 \u0111i\u1ec7n \u00e1p d\u00e2y \u00d7 d\u00f2ng \u0111i\u1ec7n d\u00e2y \u00f7 1.000 v\u00e0 I = kVA \u00d7 1.000 \u00f7 (\u221a3 \u00d7 \u0111i\u1ec7n \u00e1p d\u00e2y); t\u1ef7 s\u1ed1 bi\u1ebfn \u00e1p, tr\u1edf kh\u00e1ng, s\u1ee5t \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u00f2i h\u1ecfi c\u00e1c th\u00f4ng s\u1ed1 b\u1ed5 sung c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p.<\/strong> S\u1eed d\u1ee5ng \u0111i\u1ec7n \u00e1p d\u00e2y trong c\u00f4ng th\u1ee9c ba pha \u0111\u1ed1i x\u1ee9ng v\u00e0 ph\u00e2n bi\u1ec7t c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng d\u00e2y v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng pha \u0111\u1ed1i v\u1edbi cu\u1ed9n d\u00e2y \u0111\u1ea5u tam gi\u00e1c v\u00e0 h\u00ecnh sao. K\u1ebft qu\u1ea3 t\u00ednh to\u00e1n \u0111\u1ecbnh h\u01b0\u1edbng thi\u1ebft k\u1ebf nh\u01b0ng kh\u00f4ng thay th\u1ebf cho vi\u1ec7c l\u1ef1a ch\u1ecdn k\u00edch th\u01b0\u1edbc theo quy chu\u1ea9n ho\u1eb7c c\u00e1c nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt.<\/p>\n<div class=\"lbaji-key-takeaways\"><h2>Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h2><ul><li>S\u1eed d\u1ee5ng $\\sqrt{3}$ v\u1edbi \u0111i\u1ec7n \u00e1p d\u00e2y v\u00e0 d\u00f2ng \u0111i\u1ec7n d\u00e2y.<\/li><li>C\u00e1c gi\u00e1 tr\u1ecb pha c\u1ee7a m\u1ea1ch tam gi\u00e1c (delta) v\u00e0 h\u00ecnh sao (wye) kh\u00e1c nhau ngay c\u1ea3 khi \u0111\u00e3 bi\u1ebft c\u00e1c gi\u00e1 tr\u1ecb d\u00e2y.<\/li><li>Tr\u1edf kh\u00e1ng ki\u1ec3m so\u00e1t s\u1ef1 s\u1ee5t \u00e1p v\u00e0 d\u00f2ng s\u1ef1 c\u1ed1 th\u1ee9 c\u1ea5p kh\u1ea3 d\u1ee5ng.<\/li><\/ul><\/div>\n<h2>kVA v\u00e0 D\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y t\u1ea3i<\/h2><figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Three-phase transformer current calculation\" loading=\"lazy\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/three-phase-kva-to-amps.png\"\/><figcaption>T\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n m\u00e1y bi\u1ebfn \u00e1p ba pha.<\/figcaption><\/figure>\n<p>\u0110\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng ba pha c\u00e2n b\u1eb1ng, kVA = 1,732 \u00d7 VLL \u00d7 IL \u00f7 1.000. H\u1ec7 th\u1ed1ng 480 V \u1edf d\u00f2ng 120 A l\u00e0 kho\u1ea3ng 99,8 kVA. Bi\u1ebfn \u0111\u1ed5i l\u1ea1i, m\u00e1y bi\u1ebfn \u00e1p 150 kVA \u1edf \u0111i\u1ec7n \u00e1p 480 V t\u1ea3i \u0111\u01b0\u1ee3c kho\u1ea3ng 180,4 A; \u1edf 208 V t\u1ea3i \u0111\u01b0\u1ee3c kho\u1ea3ng 416,4 A.<\/p>\n<p>\u0110\u00e2y l\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y t\u1ea3i tr\u00ean nh\u00e3n th\u00f4ng s\u1ed1. K\u00edch th\u01b0\u1edbc d\u00e2y d\u1eabn v\u00e0 thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft y\u00eau c\u1ea7u ph\u1ea3i ki\u1ec3m tra t\u1ea3i li\u00ean t\u1ee5c, \u0111\u1ea7u c\u1ef1c, nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng, d\u00f2ng kh\u1edfi \u0111\u1ed9ng v\u00e0 quy chu\u1ea9n.<\/p>\n<h2>\u0110\u1ea1i l\u01b0\u1ee3ng pha h\u00ecnh Tam gi\u00e1c v\u00e0 h\u00ecnh Sao<\/h2>\n<p>Trong c\u1ea5u h\u00ecnh sao (wye), \u0111i\u1ec7n \u00e1p pha b\u1eb1ng \u0111i\u1ec7n \u00e1p d\u00e2y chia cho \u221a3 v\u00e0 d\u00f2ng \u0111i\u1ec7n pha b\u1eb1ng d\u00f2ng \u0111i\u1ec7n d\u00e2y. Trong c\u1ea5u h\u00ecnh tam gi\u00e1c (delta), \u0111i\u1ec7n \u00e1p pha b\u1eb1ng \u0111i\u1ec7n \u00e1p d\u00e2y v\u00e0 d\u00f2ng \u0111i\u1ec7n pha b\u1eb1ng d\u00f2ng \u0111i\u1ec7n d\u00e2y chia cho \u221a3. S\u1eed d\u1ee5ng c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y khi ki\u1ec3m tra s\u1ed1 v\u00f2ng d\u00e2y qu\u1ea5n ho\u1eb7c d\u00f2ng \u0111i\u1ec7n c\u1ee7a t\u1eebng cu\u1ed9n d\u00e2y.<\/p>\n<p>Cu\u1ed9n d\u00e2y tam gi\u00e1c 480 V c\u00f3 \u0111i\u1ec7n \u00e1p 480 V tr\u00ean m\u1ed7i pha; cu\u1ed9n d\u00e2y 208Y\/120 V c\u00f3 \u0111i\u1ec7n \u00e1p 120 V tr\u00ean m\u1ed7i pha. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao ch\u1ec9 ri\u00eang t\u1ef7 l\u1ec7 \u0111i\u1ec7n \u00e1p d\u00e2y kh\u00f4ng b\u1eb1ng t\u1ef7 l\u1ec7 s\u1ed1 v\u00f2ng cu\u1ed9n d\u00e2y ri\u00eang l\u1ebb \u0111\u1ed1i v\u1edbi m\u00e1y bi\u1ebfn \u00e1p \u0111\u1ea5u tam gi\u00e1c - sao.<\/p>\n<h2>T\u1ef7 s\u1ed1, Quy \u0111\u1ecbnh v\u00e0 S\u1ee5t \u00e1p<\/h2><figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Transformer load sizing calculation\" loading=\"lazy\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/transformer-load-sizing-calculation.png\"\/><figcaption>T\u00ednh to\u00e1n dung l\u01b0\u1ee3ng t\u1ea3i m\u00e1y bi\u1ebfn \u00e1p.<\/figcaption><\/figure>\n<p>T\u1ef7 s\u1ed1 \u0111i\u1ec7n \u00e1p pha l\u00fd t\u01b0\u1edfng b\u1eb1ng t\u1ef7 s\u1ed1 v\u00f2ng d\u00e2y. \u0110i\u1ec7n \u00e1p th\u1ee9 c\u1ea5p khi c\u00f3 t\u1ea3i thay \u0111\u1ed5i do \u0111i\u1ec7n tr\u1edf d\u00e2y qu\u1ea5n v\u00e0 \u0111i\u1ec7n kh\u00e1ng r\u00f2. Ph\u1ea7n tr\u0103m \u0111i\u1ec1u ch\u1ec9nh ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ed5ng tr\u1edf, d\u00f2ng \u0111i\u1ec7n t\u1ea3i v\u00e0 h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t.<\/p>\n<p>\u0110\u1ed9 s\u1ee5t \u00e1p c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n t\u00e1ch bi\u1ec7t v\u1edbi s\u1ef1 \u1ed5n \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p. H\u00e3y m\u00f4 h\u00ecnh h\u00f3a c\u1ea3 hai khi ki\u1ec3m tra t\u00ecnh tr\u1ea1ng kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 ho\u1eb7c c\u00e1c t\u1ea3i \u1edf xa, s\u1eed d\u1ee5ng d\u1eef li\u1ec7u th\u1ef1c t\u1ebf v\u1ec1 d\u00e2y d\u1eabn v\u00e0 m\u00e1y bi\u1ebfn \u00e1p.<\/p>\n<h2>V\u00ed d\u1ee5 T\u00ednh to\u00e1n Ba pha<\/h2><figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th scope=\"col\">Ph\u00e9p t\u00ednh<\/th><th scope=\"col\">\u0110\u1ea7u v\u00e0o<\/th><th scope=\"col\">C\u00f4ng th\u1ee9c<\/th><th scope=\"col\">K\u1ebft qu\u1ea3<\/th><\/tr><\/thead><tbody><tr><td>C\u00f4ng su\u1ea5t kVA<\/td><td>480 V, 120 A<\/td><td>1,732 \u00d7 480 \u00d7 120 \u00f7 1.000<\/td><td>99,8 kVA<\/td><\/tr><tr><td>D\u00f2ng \u0111i\u1ec7n 150 kVA<\/td><td>480 V<\/td><td>150.000 \u00f7 (1,732 \u00d7 480)<\/td><td>180.4 A<\/td><\/tr><tr><td>D\u00f2ng \u0111i\u1ec7n 150 kVA<\/td><td>208 V<\/td><td>150.000 \u00f7 (1,732 \u00d7 208)<\/td><td>416.4 A<\/td><\/tr><tr><td>\u0110i\u1ec7n \u00e1p pha h\u00ecnh sao<\/td><td>\u0110\u01b0\u1eddng d\u00e2y 208 V<\/td><td>208 \u00f7 1.732<\/td><td>120 V<\/td><\/tr><tr><td>\u01af\u1edbc l\u01b0\u1ee3ng l\u1ed7i<\/td><td>1.203 A, 5.75% Z<\/td><td>1,203 \u00f7 0,0575<\/td><td>20,9 kA<\/td><\/tr><\/tbody><\/table><\/figure>\n<h2>\u01af\u1edbc t\u00ednh T\u1ed5ng tr\u1edf v\u00e0 D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1<\/h2>\n<p>M\u1ed9t \u01b0\u1edbc t\u00ednh s\u01a1 b\u1ed9 v\u1ec1 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u1ea7u cu\u1ed1i th\u1ee9 c\u1ea5p v\u1edbi ngu\u1ed3n c\u1ee9ng l\u00e0 d\u00f2ng \u0111i\u1ec7n t\u1ea3i \u0111\u1ea7y \u00f7 tr\u1edf kh\u00e1ng theo \u0111\u01a1n v\u1ecb. M\u1ed9t m\u00e1y bi\u1ebfn \u00e1p 1.000 kVA, 480 V c\u00f3 d\u00f2ng \u0111i\u1ec7n t\u1ea3i \u0111\u1ea7y kho\u1ea3ng 1.203 A; v\u1edbi tr\u1edf kh\u00e1ng 5,75%, d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u1ea7u cu\u1ed1i l\u00fd t\u01b0\u1edfng l\u00e0 kho\u1ea3ng 20,9 kA.<\/p>\n<p>C\u00e1c nghi\u00ean c\u1ee9u th\u1ef1c t\u1ebf bao g\u1ed3m tr\u1edf kh\u00e1ng ngu\u1ed3n, c\u00e1p, \u0111\u1ed9ng c\u01a1, dung sai, v\u1ecb tr\u00ed \u0111\u1ea7u ph\u00e2n \u00e1p v\u00e0 t\u1ef7 l\u1ec7 X\/R. Kh\u00f4ng s\u1eed d\u1ee5ng \u01b0\u1edbc t\u00ednh \u0111\u01a1n gi\u1ea3n l\u00e0m nghi\u00ean c\u1ee9u v\u1ec1 c\u00f4ng su\u1ea5t thi\u1ebft b\u1ecb cu\u1ed1i c\u00f9ng.<\/p>\n<h2>X\u00e1c th\u1ef1c k\u1ef9 thu\u1eadt v\u00e0 Gi\u1edbi h\u1ea1n an to\u00e0n<\/h2><p>H\u01b0\u1edbng d\u1eabn n\u00e0y h\u1ed7 tr\u1ee3 vi\u1ec7c l\u1eadp th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 mua s\u1eafm; t\u00e0i li\u1ec7u n\u00e0y kh\u00f4ng thay th\u1ebf cho nghi\u00ean c\u1ee9u d\u1ef1 \u00e1n, quy chu\u1ea9n hi\u1ec7n h\u00e0nh, h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t ho\u1eb7c c\u00f4ng vi\u1ec7c c\u1ee7a nh\u00e2n vi\u00ean \u0111i\u1ec7n c\u00f3 chuy\u00ean m\u00f4n. H\u00e3y x\u00e1c minh c\u00e1c n\u1ed9i dung sau tr\u01b0\u1edbc khi l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb, th\u1eed nghi\u1ec7m, \u0111\u1ea5u d\u00e2y ho\u1eb7c \u0111\u00f3ng \u0111i\u1ec7n:<\/p><ul><li>X\u00e1c nh\u1eadn \u0111i\u1ec7n \u00e1p d\u00e2y-d\u00e2y v\u00e0 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u1ec1 h\u1ec7 ba pha c\u00e2n b\u1eb1ng.<\/li><li>\u00c1p d\u1ee5ng c\u00e1c m\u1ed1i quan h\u1ec7 tam gi\u00e1c\/sao tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng d\u00e2y qu\u1ea5n.<\/li><li>S\u1eed d\u1ee5ng t\u1ed5ng tr\u1edf tr\u00ean nh\u00e3n m\u00e1y v\u00e0 dung sai c\u1ee7a n\u00f3.<\/li><li>Bao g\u1ed3m \u0111\u00f3ng g\u00f3p t\u1eeb ngu\u1ed3n, c\u00e1p v\u00e0 \u0111\u1ed9ng c\u01a1 trong c\u00e1c nghi\u00ean c\u1ee9u s\u1ef1 c\u1ed1 cu\u1ed1i c\u00f9ng.<\/li><li>T\u00e1ch bi\u1ec7t d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n kh\u1ecfi vi\u1ec7c ch\u1ecdn k\u00edch th\u01b0\u1edbc thi\u1ebft b\u1ecb theo quy chu\u1ea9n.<\/li><\/ul>\n<h2>Th\u00f4ng tin c\u1ea7n \u0111\u01b0a v\u00e0o Y\u00eau c\u1ea7u b\u00e1o gi\u00e1<\/h2><p>M\u1ed9t b\u00e1o gi\u00e1 h\u1eefu \u00edch ph\u1ea3i d\u1ef1a tr\u00ean c\u00f9ng m\u1ed9t ranh gi\u1edbi k\u1ef9 thu\u1eadt cho m\u1ecdi nh\u00e0 cung c\u1ea5p. H\u00e3y bao g\u1ed3m c\u00e1c th\u00f4ng tin sau v\u00e0 y\u00eau c\u1ea7u li\u1ec7t k\u00ea r\u00f5 r\u00e0ng m\u1ecdi sai l\u1ec7ch:<\/p><ul><li>kVA, \u0111i\u1ec7n \u00e1p d\u00e2y, s\u1ed1 pha, t\u1ea7n s\u1ed1 v\u00e0 t\u1ed5 \u0111\u1ea5u d\u00e2y.<\/li><li>Tr\u1edf kh\u00e1ng, c\u00e1c \u0111\u1ea7u ph\u00e2n \u00e1p, \u0111i\u1ec1u \u00e1p v\u00e0 d\u1eef li\u1ec7u s\u1ef1 c\u1ed1 ngu\u1ed3n.<\/li><li>D\u00f2ng \u0111i\u1ec7n t\u1ea3i, h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t, \u0111\u1ed9ng c\u01a1 v\u00e0 s\u00f3ng h\u00e0i.<\/li><li>M\u00f4i tr\u01b0\u1eddng, \u0111\u1ed9 cao, h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai.<\/li><li>C\u00e1c nghi\u00ean c\u1ee9u, t\u00ednh to\u00e1n, th\u1eed nghi\u1ec7m v\u00e0 c\u00e1c gi\u00e1 tr\u1ecb b\u1ea3o \u0111\u1ea3m \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u.<\/li><\/ul>\n<h2>T\u1eeb D\u1eef li\u1ec7u K\u1ef9 thu\u1eadt \u0111\u1ebfn m\u1ed9t Quy\u1ebft \u0111\u1ecbnh \u0111\u01b0\u1ee3c Ph\u00ea duy\u1ec7t<\/h2><p>S\u1eed d\u1ee5ng quy tr\u00ecnh \u0111\u00e1nh gi\u00e1 theo t\u1eebng giai \u0111o\u1ea1n thay v\u00ec ph\u00ea duy\u1ec7t k\u1ebft qu\u1ea3 kh\u1edbp danh m\u1ee5c \u0111\u1ea7u ti\u00ean. B\u1eaft \u0111\u1ea7u v\u1edbi kva v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y t\u1ea3i, sau \u0111\u00f3 \u0111\u1ed1i chi\u1ebfu c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng pha tam gi\u00e1c v\u00e0 sao v\u1edbi t\u1ef7 s\u1ed1 bi\u1ebfn \u00e1p, \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p v\u00e0 \u0111\u1ed9 s\u1ee5t \u00e1p. Ho\u00e0n t\u1ea5t qu\u00e1 tr\u00ecnh \u0111\u00e1nh gi\u00e1 v\u1edbi \u01b0\u1edbc t\u00ednh tr\u1edf kh\u00e1ng v\u00e0 d\u00f2ng s\u1ef1 c\u1ed1. \u1ede m\u1ed7i giai \u0111o\u1ea1n, h\u00e3y ghi l\u1ea1i t\u00e0i li\u1ec7u ngu\u1ed3n, \u0111\u01a1n v\u1ecb, tr\u01b0\u1eddng h\u1ee3p v\u1eadn h\u00e0nh v\u00e0 ng\u01b0\u1eddi ch\u1ecbu tr\u00e1ch nhi\u1ec7m ph\u00ea duy\u1ec7t. \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u0103n ch\u1eb7n m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c sao ch\u00e9p t\u1eeb b\u1ea3n v\u1ebd c\u0169, nh\u00e3n h\u1ec7 th\u1ed1ng danh \u0111\u1ecbnh ho\u1eb7c s\u1ea3n ph\u1ea9m kh\u00f4ng li\u00ean quan tr\u1edf th\u00e0nh \u0111\u1ea7u v\u00e0o thi\u1ebft k\u1ebf kh\u00f4ng ki\u1ec3m so\u00e1t.<\/p><p>Tr\u01b0\u1edbc khi nghi\u1ec7m thu, h\u00e3y so s\u00e1nh ph\u1ea3n h\u1ed3i c\u1ee7a nh\u00e0 th\u1ea7u t\u1eebng d\u00f2ng m\u1ed9t v\u1edbi Y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ) v\u00e0 \u0111\u00e1nh d\u1ea5u m\u1ecdi \u0111i\u1ec3m ngo\u1ea1i l\u1ec7. X\u00e1c nh\u1eadn r\u1eb1ng c\u00e1c b\u1ea3n v\u1ebd, t\u00ednh to\u00e1n, th\u00f4ng s\u1ed1 c\u00e0i \u0111\u1eb7t, ch\u1ee9ng ch\u1ec9 v\u00e0 b\u00e1o c\u00e1o th\u1eed nghi\u1ec7m \u0111\u1ec1u \u0111\u1ec1 c\u1eadp ch\u00ednh x\u00e1c \u0111\u1ebfn m\u1eabu v\u00e0 phi\u00ean b\u1ea3n \u0111\u01b0\u1ee3c ch\u00e0o th\u1ea7u. L\u01b0u gi\u1eef h\u1ed3 s\u01a1 tr\u00ecnh duy\u1ec7t \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t, d\u1eef li\u1ec7u tr\u00ean nh\u00e3n thi\u1ebft b\u1ecb, k\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m t\u1ea1i x\u01b0\u1edfng v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 \u0111o \u0111\u1ea1c khi ch\u1ea1y th\u1eed l\u00e0m c\u01a1 s\u1edf b\u1ea3o tr\u00ec. N\u1ebfu c\u00f3 s\u1ef1 thay \u0111\u1ed5i v\u1ec1 \u0111\u1ecbnh m\u1ee9c, k\u1ebft n\u1ed1i, m\u00f4i tr\u01b0\u1eddng ho\u1eb7c \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m, h\u00e3y l\u1eb7p l\u1ea1i vi\u1ec7c \u0111\u00e1nh gi\u00e1 \u0111\u1ed1i v\u1edbi ph\u1ea7n b\u1ecb \u1ea3nh h\u01b0\u1edfng thay v\u00ec gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng k\u1ebft lu\u1eadn ban \u0111\u1ea7u v\u1eabn c\u00f2n gi\u00e1 tr\u1ecb.<\/p>\n<p>Vi\u1ec7c ki\u1ec3m so\u00e1t t\u00e0i li\u1ec7u ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c phi\u00ean b\u1ea3n, tr\u1ea1ng th\u00e1i ph\u00ea duy\u1ec7t v\u00e0 c\u00e1c t\u1ec7p b\u1ecb thay th\u1ebf. C\u00e1c \u0111\u1ed9i ng\u0169 hi\u1ec7n tr\u01b0\u1eddng ph\u1ea3i nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c gi\u00e1 tr\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t gi\u1ed1ng nhau \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho vi\u1ec7c mua s\u1eafm, trong khi c\u00e1c h\u1ed3 s\u01a1 ch\u1ea1y th\u1eed ph\u1ea3i ghi l\u1ea1i m\u1ecdi thay \u0111\u1ed5i \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n th\u1ef1c hi\u1ec7n trong qu\u00e1 tr\u00ecnh l\u1eafp \u0111\u1eb7t. Kh\u1ea3 n\u0103ng truy xu\u1ea5t ngu\u1ed3n g\u1ed1c n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng khi thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c thay th\u1ebf nhi\u1ec1u n\u0103m sau \u0111\u00f3: k\u1ef9 s\u01b0 ti\u1ebfp theo c\u1ea7n c\u00e1c giao di\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh v\u00e0 l\u1ecbch s\u1eed ki\u1ec3m tra, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t m\u00f4 t\u1ea3 ch\u01b0a \u0111\u1ea7y \u0111\u1ee7 \u0111\u01b0\u1ee3c sao ch\u00e9p t\u1eeb \u0111\u01a1n \u0111\u1eb7t h\u00e0ng.<\/p>\n<h2>Th\u00f4ng tin bao qu\u00e1t d\u1ef1a tr\u00ean k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm hi\u1ec7n t\u1ea1i<\/h2><p>Top 20 b\u00e0i \u0111\u00e1nh gi\u00e1 h\u00e0ng \u0111\u1ea7u tr\u00ean Google t\u1ea1i M\u1ef9 hi\u1ec7n t\u1ea1i li\u00ean t\u1ee5c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c ch\u1ee7 \u0111\u1ec1 bao g\u1ed3m C\u00f4ng th\u1ee9c kVA ba pha, C\u00c1CH T\u00cdNH K\u00cdCH TH\u01af\u1edaC M\u00c1Y BI\u1ebeN \u00c1P, C\u00f4ng th\u1ee9c t\u00ednh k\u00edch th\u01b0\u1edbc m\u00e1y bi\u1ebfn \u00e1p 3 pha v\u1edbi t\u1ea3i m\u1ed9t pha l\u00e0 g\u00ec?, K\u1ebft n\u1ed1i tam gi\u00e1c \u1ea3nh h\u01b0\u1edfng th\u1ebf n\u00e0o \u0111\u1ebfn vi\u1ec7c t\u00ednh k\u00edch th\u01b0\u1edbc m\u00e1y bi\u1ebfn \u00e1p?, B\u1ea3ng 1. B\u00e0i vi\u1ebft gi\u1ea3i quy\u1ebft c\u00e1c nhu c\u1ea7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u00f3 theo tr\u00ecnh t\u1ef1 k\u1ef9 thu\u1eadt v\u00e0 mua s\u1eafm ban \u0111\u1ea7u; c\u00e1c \u0111i\u1ec1u h\u01b0\u1edbng th\u01b0\u01a1ng hi\u1ec7u \u0111\u1ed1i th\u1ee7 v\u00e0 t\u00e0i li\u1ec7u b\u00e1n h\u00e0ng kh\u00f4ng li\u00ean quan \u0111\u00e3 \u0111\u01b0\u1ee3c lo\u1ea1i tr\u1eeb.<\/p>\n<h2>T\u00e0i li\u1ec7u LBAJI li\u00ean quan<\/h2><p>Ti\u1ebfp t\u1ee5c v\u1edbi <a href=\"https:\/\/lbajiele.com\/vi\/blog\/complete-guide-to-transformer-sizing-calculations\/\">H\u01b0\u1edbng d\u1eabn t\u00ednh to\u00e1n m\u00e1y bi\u1ebfn \u00e1p<\/a> <a href=\"https:\/\/lbajiele.com\/vi\/blog\/amps-convert-to-kva-calculator-and-formula-guide\/\">H\u01b0\u1edbng d\u1eabn \u0111\u1ed5i t\u1eeb Ampe sang kVA<\/a> <a href=\"https:\/\/lbajiele.com\/vi\/blog\/transformer-calculator-calculator-and-formula-guide\/\">m\u00e1y t\u00ednh bi\u1ebfn \u00e1p<\/a>. Nh\u1eefng t\u00e0i nguy\u00ean n\u00e0y gi\u00fap k\u1ebft n\u1ed1i vi\u1ec7c t\u00ednh to\u00e1n ho\u1eb7c quy\u1ebft \u0111\u1ecbnh l\u1ef1a ch\u1ecdn linh ki\u1ec7n v\u1edbi m\u1ed9t b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ho\u00e0n ch\u1ec9nh c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p, thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft, thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i.<\/p>\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list\">\n<\/div>\n<\/div>\n<section class=\"lbaji-technical-references\"><h2>T\u00e0i li\u1ec7u tham kh\u1ea3o k\u1ef9 thu\u1eadt v\u00e0 \u0110\u1ecdc th\u00eam<\/h2><ul><li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/588\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">IEC 60076-1<\/a> \u2014 C\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c v\u00e0 d\u1eef li\u1ec7u tr\u1edf kh\u00e1ng c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p.<\/li><li><a href=\"https:\/\/www.nist.gov\/pml\/owm\/si-units-electric-current-ampere\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">\u0110\u01a1n v\u1ecb SI c\u1ee7a NIST<\/a> \u2014 C\u00e1c \u0111\u01a1n v\u1ecb \u0111i\u1ec7n.<\/li><li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">Quy chu\u1ea9n v\u00e0 Ti\u00eau chu\u1ea9n NFPA<\/a> \u2014 Y\u00eau c\u1ea7u v\u1ec1 l\u1eafp \u0111\u1eb7t v\u00e0 b\u1ea3o v\u1ec7.<\/li><\/ul><\/section>\n<h2>K\u1ebft lu\u1eadn<\/h2><p>C\u00e1c ph\u00e9p t\u00ednh ba pha \u0111\u00e1ng tin c\u1eady khi c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u1ec1 \u0111\u01b0\u1eddng d\u00e2y, pha, \u0111\u1ea5u n\u1ed1i v\u00e0 t\u1ed5ng tr\u1edf \u0111\u01b0\u1ee3c ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng. S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c \u0111\u1ec3 ki\u1ec3m tra minh b\u1ea1ch, sau \u0111\u00f3 ho\u00e0n th\u00e0nh c\u00e1c nghi\u00ean c\u1ee9u v\u1ec1 \u0111\u1ed9 s\u1ee5t \u00e1p, s\u1ef1 c\u1ed1, b\u1ea3o v\u1ec7 v\u00e0 quy chu\u1ea9n v\u1edbi d\u1eef li\u1ec7u h\u1ec7 th\u1ed1ng \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c.<\/p>","protected":false},"excerpt":{"rendered":"<p>C\u00e1c ph\u00e9p t\u00ednh m\u00e1y bi\u1ebfn \u00e1p ba pha s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c kVA = \u221a3 \u00d7 \u0111i\u1ec7n \u00e1p d\u00e2y \u00d7 d\u00f2ng \u0111i\u1ec7n d\u00e2y \u00f7 1.000 v\u00e0 I = kVA \u00d7 1.000 \u00f7 (\u221a3 \u00d7 \u0111i\u1ec7n \u00e1p d\u00e2y); t\u1ef7 s\u1ed1 bi\u1ebfn \u00e1p, tr\u1edf kh\u00e1ng, s\u1ee5t \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u00f2i h\u1ecfi d\u1eef li\u1ec7u m\u00e1y bi\u1ebfn \u00e1p b\u1ed5 sung.\u2026<\/p>","protected":false},"author":6,"featured_media":2890,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[52],"tags":[64,66,67,69,65],"class_list":["post-2891","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-transformers","tag-three-phase-transformer","tag-transformer-capacity","tag-transformer-efficiency","tag-transformer-protection","tag-transformer-sizing"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2891","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=2891"}],"version-history":[{"count":1,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2891\/revisions"}],"predecessor-version":[{"id":3023,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2891\/revisions\/3023"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media\/2890"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media?parent=2891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/categories?post=2891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/tags?post=2891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}