{"id":2722,"date":"2026-08-22T14:27:00","date_gmt":"2026-08-22T14:27:00","guid":{"rendered":"https:\/\/lbajiele.com\/?p=2722"},"modified":"2026-08-17T00:39:18","modified_gmt":"2026-08-17T00:39:18","slug":"75-kva-transformer-amps-guide","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/vi\/blog\/75-kva-transformer-amps-guide\/","title":{"rendered":"Ampe m\u00e1y bi\u1ebfn \u00e1p 75 kVA: H\u01b0\u1edbng d\u1eabn d\u00f2ng \u0111i\u1ec7n s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p"},"content":{"rendered":"<p><strong>M\u00e1y bi\u1ebfn \u00e1p 75 kVA kh\u00f4ng c\u00f3 m\u1ed9t \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n c\u1ed1 \u0111\u1ecbnh.<\/strong> D\u00f2ng \u0111i\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o pha v\u00e0 \u0111i\u1ec7n \u00e1p: d\u00f2ng \u0111i\u1ec7n m\u1ed9t pha l\u00e0 75.000 \u00f7 V; d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1eddng d\u00e2y ba pha l\u00e0 75.000 \u00f7 (1,732 \u00d7 V). V\u00ed d\u1ee5, 75 kVA t\u01b0\u01a1ng \u0111\u01b0\u01a1ng kho\u1ea3ng 90,2 A \u1edf \u0111i\u1ec7n \u00e1p ba pha 480 V v\u00e0 208,4 A \u1edf \u0111i\u1ec7n \u00e1p ba pha 208 V.<\/p>\n<div class=\"lbaji-key-takeaways\"><h2>Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h2><ul><li>B\u1eaft \u0111\u1ea7u v\u1edbi d\u1eef li\u1ec7u h\u1ec7 th\u1ed1ng \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh v\u00e0 ti\u00eau chu\u1ea9n qu\u1ea3n l\u00fd.<\/li><li>Ph\u1ed1i h\u1ee3p c\u00e1c ti\u00eau ch\u00ed \u0111\u00e1nh gi\u00e1, b\u1ea3o v\u1ec7, m\u00f4i tr\u01b0\u1eddng v\u00e0 b\u1ea3o d\u01b0\u1ee1ng nh\u01b0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh duy nh\u1ea5t.<\/li><li>S\u1eed d\u1ee5ng b\u1ea3n v\u1ebd, c\u00e1c ph\u00e9p t\u00ednh v\u00e0 bi\u00ean b\u1ea3n ki\u1ec3m tra \u0111\u1ec3 h\u1ed7 tr\u1ee3 c\u00f4ng t\u00e1c mua s\u1eafm.<\/li><\/ul><\/div>\n<h2>C\u00f4ng th\u1ee9c d\u00f2ng \u0111i\u1ec7n 75 kVA<\/h2><figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Three-phase transformer and switchboard used for full-load current calculations\" loading=\"lazy\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/three-phase-kva-to-amps.png\"\/><figcaption>M\u00e1y bi\u1ebfn \u00e1p ba pha v\u00e0 t\u1ee7 \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n t\u1ea3i \u0111\u1ea7y.<\/figcaption><\/figure><p>\u0110\u1ed1i v\u1edbi m\u1ed9t pha, I = kVA \u00d7 1.000 \u00f7 V. \u0110\u1ed1i v\u1edbi ba pha, I = kVA \u00d7 1.000 \u00f7 (\u221a3 \u00d7 \u0111i\u1ec7n \u00e1p d\u00e2y-d\u00e2y). S\u1eed d\u1ee5ng \u0111i\u1ec7n \u00e1p tr\u00ean nh\u00e3n th\u00f4ng s\u1ed1 thay v\u00ec gi\u1ea3 \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c. C\u00e1c ph\u01b0\u01a1ng tr\u00ecnh n\u00e0y m\u00f4 t\u1ea3 d\u00f2ng \u0111i\u1ec7n bi\u1ec3u ki\u1ebfn \u0111\u1ea7y t\u1ea3i; vi\u1ec7c l\u1ef1a ch\u1ecdn k\u00edch th\u01b0\u1edbc d\u00e2y d\u1eabn v\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 v\u1eabn tu\u00e2n theo quy chu\u1ea9n hi\u1ec7n h\u00e0nh, ch\u1ebf \u0111\u1ed9 t\u1ea3i, nhi\u1ec7t \u0111\u1ed9 v\u00e0 ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t.<\/p>\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>C\u00f4ng th\u1ee9c d\u00f2ng \u0111i\u1ec7n 75 kVA<\/td><td>\u0110\u1ed1i v\u1edbi m\u1ed9t pha, I = kVA \u00d7 1.000 \u00f7 V.<\/td><td>\u0110\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng ba pha, I = kVA \u00d7 1.000 \u00f7 (\u221a3 \u00d7 \u0111i\u1ec7n \u00e1p gi\u1eefa c\u00e1c d\u00e2y).<\/td><\/tr><tr><td>D\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y t\u1ea3i 75 kVA ph\u1ed5 bi\u1ebfn<\/td><td>\u1ede m\u1ee9c 240 V m\u1ed9t pha, d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n l\u00e0 312,5 A, v\u00e0 \u1edf m\u1ee9c 480 V m\u1ed9t pha l\u00e0 156,3 A.<\/td><td>\u0110\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng ba pha, c\u00e1c k\u1ebft qu\u1ea3 ph\u1ed5 bi\u1ebfn l\u00e0 90,2 A \u1edf 480 V, 104,3 A \u1edf 415 V, 108,3 A \u1edf 400 V, 208,4 A \u1edf 208 V v\u00e0 180,4 A \u1edf 240 V.<\/td><\/tr><tr><td>B\u1ed9 khu\u1ebfch \u0111\u1ea1i ch\u00ednh v\u00e0 ph\u1ee5<\/td><td>M\u1ed9t m\u00e1y bi\u1ebfn \u00e1p ba pha 480 \u0111\u1ebfn 208Y\/120 V mang kho\u1ea3ng 90 A \u1edf ph\u00eda 480 V v\u00e0 208 A \u1edf ph\u00eda 208 V \u1edf c\u00f4ng su\u1ea5t 75 kVA.<\/td><td>M\u00e1y bi\u1ebfn \u00e1p thay \u0111\u1ed5i m\u1ed1i quan h\u1ec7 \u0111i\u1ec7n \u00e1p - d\u00f2ng \u0111i\u1ec7n trong khi c\u00f4ng su\u1ea5t bi\u1ec3u ki\u1ebfn v\u1eabn x\u1ea5p x\u1ec9 kh\u00f4ng \u0111\u1ed5i, tr\u1eeb c\u00e1c t\u1ed5n th\u1ea5t.<\/td><\/tr><tr><td>K\u00edch th\u01b0\u1edbc Aptomat v\u00e0 D\u00e2y d\u1eabn<\/td><td>Kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn c\u1ea7u dao ch\u1ec9 d\u1ef1a v\u00e0o s\u1ed1 li\u1ec7u \u0111\u1ea7y t\u1ea3i.<\/td><td>C\u00e1c quy \u0111\u1ecbnh cho ph\u00e9p ho\u1eb7c y\u00eau c\u1ea7u c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 ch\u1ec9 ch\u00ednh ho\u1eb7c c\u1ea3 ch\u00ednh v\u00e0 d\u1ef1 ph\u00f2ng c\u1ee5 th\u1ec3, \u0111\u1ed3ng th\u1eddi t\u00ednh \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng.<\/td><\/tr><tr><td>75 kVA c\u00f3 \u0111\u1ee7 l\u1edbn kh\u00f4ng?<\/td><td>C\u1ed9ng c\u00f4ng su\u1ea5t kVA thay v\u00ec ch\u1ec9 c\u1ed9ng \u0111\u01a1n gi\u1ea3n c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n (amperes) \u1edf c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p kh\u00e1c nhau.<\/td><td>Xem x\u00e9t nhu c\u1ea7u, d\u00f2ng kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1, s\u00f3ng h\u00e0i phi tuy\u1ebfn, kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng trong t\u01b0\u01a1ng lai, nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng v\u00e0 m\u1ee9c \u0111\u1ed9 s\u1ee5t \u00e1p cho ph\u00e9p.<\/td><\/tr><\/tbody><\/table><\/figure><\/section><h2>D\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y t\u1ea3i 75 kVA ph\u1ed5 bi\u1ebfn<\/h2><p>\u1ede \u0111i\u1ec7n \u00e1p 1 pha 240 V, d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n l\u00e0 312,5 A v\u00e0 \u1edf \u0111i\u1ec7n \u00e1p 1 pha 480 V l\u00e0 156,3 A. \u0110\u1ed1i v\u1edbi \u0111i\u1ec7n \u00e1p 3 pha, c\u00e1c k\u1ebft qu\u1ea3 ph\u1ed5 bi\u1ebfn l\u00e0 90,2 A \u1edf 480 V, 104,3 A \u1edf 415 V, 108,3 A \u1edf 400 V, 208,4 A \u1edf 208 V v\u00e0 180,4 A \u1edf 240 V. Kh\u00f4ng n\u00ean d\u00f9ng vi\u1ec7c l\u00e0m tr\u00f2n s\u1ed1 \u0111\u1ec3 che gi\u1ea5u s\u1ef1 sai l\u1ec7ch v\u1ec1 \u0111i\u1ec7n \u00e1p.<\/p>\n<p>\u0110\u1ed1i v\u1edbi vi\u1ec7c so s\u00e1nh theo t\u1eebng d\u1ef1 \u00e1n c\u1ee5 th\u1ec3, h\u00e3y ghi l\u1ea1i c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 \u0111\u01b0a thi\u1ebft k\u1ebf cu\u1ed1i c\u00f9ng cho nh\u00e2n vi\u00ean \u0111i\u1ec7n c\u00f3 chuy\u00ean m\u00f4n xem x\u00e9t. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u00f3 li\u00ean quan \u0111\u1ebfn n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1, trung th\u1ebf, giao di\u1ec7n \u0111i\u1ec7n l\u1ef1c ho\u1eb7c c\u00f4ng vi\u1ec7c c\u00f3 \u0111i\u1ec7n.<\/p>\n<h2>B\u1ed9 khu\u1ebfch \u0111\u1ea1i ch\u00ednh v\u00e0 ph\u1ee5<\/h2><figure class=\"wp-block-image size-large\"><img decoding=\"async\" alt=\"Coordinated transformer primary and secondary protection\" loading=\"lazy\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/transformer-breaker-fuse-sizing.png\"\/><figcaption>B\u1ea3o v\u1ec7 ph\u1ed1i h\u1ee3p ph\u00eda s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p.<\/figcaption><\/figure><p>M\u1ed9t m\u00e1y bi\u1ebfn \u00e1p ba pha 480 \u0111\u1ebfn 208Y\/120 V mang kho\u1ea3ng 90 A \u1edf ph\u00eda 480 V v\u00e0 208 A \u1edf ph\u00eda 208 V \u1edf m\u1ee9c 75 kVA. M\u00e1y bi\u1ebfn \u00e1p thay \u0111\u1ed5i m\u1ed1i quan h\u1ec7 \u0111i\u1ec7n \u00e1p - d\u00f2ng \u0111i\u1ec7n trong khi c\u00f4ng su\u1ea5t bi\u1ec3u ki\u1ebfn duy tr\u00ec g\u1ea7n nh\u01b0 kh\u00f4ng \u0111\u1ed5i, kh\u00f4ng t\u00ednh t\u1ed5n th\u1ea5t. Do \u0111\u00f3, c\u00e1c d\u00e2y d\u1eabn s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p c\u1ea7n c\u00f3 kh\u1ea3 n\u0103ng mang d\u00f2ng \u0111i\u1ec7n (ampacity) v\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 kh\u00e1c nhau.<\/p>\n<h2>K\u00edch th\u01b0\u1edbc Aptomat v\u00e0 D\u00e2y d\u1eabn<\/h2><p>Kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn c\u1ea7u dao ch\u1ec9 d\u1ef1a v\u00e0o th\u00f4ng s\u1ed1 d\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y \u0111\u1ee7 t\u1ea3i. C\u00e1c quy chu\u1ea9n cho ph\u00e9p ho\u1eb7c y\u00eau c\u1ea7u c\u00e1c b\u1ed1 tr\u00ed b\u1ea3o v\u1ec7 ch\u1ec9 \u1edf s\u01a1 c\u1ea5p ho\u1eb7c c\u1ea3 s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p c\u1ee5 th\u1ec3, \u0111\u1ed3ng th\u1eddi t\u00ednh \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng. C\u00e1c d\u00e2y d\u1eabn ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u1ec1 t\u1ea3i li\u00ean t\u1ee5c, nhi\u1ec7t \u0111\u1ed9 c\u00e1ch \u0111i\u1ec7n, \u0111\u1ecbnh m\u1ee9c \u0111\u1ea7u c\u1ef1c, hi\u1ec7u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng, nh\u00f3m v\u00e0 \u0111\u1ed9 s\u1ee5t \u00e1p. M\u1ed9t nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 \u0111\u1ee7 chuy\u00ean m\u00f4n n\u00ean ph\u1ed1i h\u1ee3p c\u00e1c thi\u1ebft b\u1ecb ph\u00eda ngu\u1ed3n v\u00e0 ph\u00eda t\u1ea3i.<\/p>\n<p>\u0110\u1ed1i v\u1edbi vi\u1ec7c so s\u00e1nh theo t\u1eebng d\u1ef1 \u00e1n c\u1ee5 th\u1ec3, h\u00e3y ghi l\u1ea1i c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 \u0111\u01b0a thi\u1ebft k\u1ebf cu\u1ed1i c\u00f9ng cho nh\u00e2n vi\u00ean \u0111i\u1ec7n c\u00f3 chuy\u00ean m\u00f4n xem x\u00e9t. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u00f3 li\u00ean quan \u0111\u1ebfn n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1, trung th\u1ebf, giao di\u1ec7n \u0111i\u1ec7n l\u1ef1c ho\u1eb7c c\u00f4ng vi\u1ec7c c\u00f3 \u0111i\u1ec7n.<\/p>\n<h2>75 kVA c\u00f3 \u0111\u1ee7 l\u1edbn kh\u00f4ng?<\/h2><p>C\u1ed9ng c\u00f4ng su\u1ea5t kVA thay v\u00ec ch\u1ec9 c\u1ed9ng \u0111\u01a1n gi\u1ea3n c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n (amperes) qua c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p kh\u00e1c nhau. C\u1ea7n c\u00e2n nh\u1eafc h\u1ec7 s\u1ed1 nhu c\u1ea7u, d\u00f2ng kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1, s\u00f3ng h\u00e0i phi tuy\u1ebfn t\u00ednh, kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng trong t\u01b0\u01a1ng lai, nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng v\u00e0 m\u1ee9c \u0111\u1ed9 s\u1ee5t \u00e1p cho ph\u00e9p. M\u1ed9t thi\u1ebft b\u1ecb \u0111\u1ee7 d\u00f9ng cho t\u1ea3i \u1ed5n \u0111\u1ecbnh c\u00f3 th\u1ec3 g\u00e2y s\u1ee5t \u00e1p qu\u00e1 m\u1ee9c khi \u0111\u1ed9ng c\u01a1 t\u0103ng t\u1ed1c ho\u1eb7c b\u1ecb n\u00f3ng khi v\u1eadn h\u00e0nh v\u1edbi d\u00f2ng \u0111i\u1ec7n ch\u1ee9a nhi\u1ec1u th\u00e0nh ph\u1ea7n s\u00f3ng h\u00e0i.<\/p>\n<h2>Ki\u1ec3m tra Nh\u00e3n t\u00ean v\u00e0 Mua s\u1eafm<\/h2><p>X\u00e1c nh\u1eadn \u0111i\u1ec7n \u00e1p s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p, s\u1ed1 pha, t\u1ea7n s\u1ed1, t\u1ed5 n\u1ed1i d\u00e2y, \u0111\u1ea7u ph\u00e2n \u00e1p, \u0111i\u1ec7n kh\u00e1ng (tr\u1edf kh\u00e1ng), c\u1ea5p c\u00e1ch \u0111i\u1ec7n, \u0111\u1ed9 t\u0103ng nhi\u1ec7t, v\u1ecf b\u1ea3o v\u1ec7, hi\u1ec7u su\u1ea5t, \u0111\u1ed9 \u1ed3n v\u00e0 c\u00e1c ph\u1ee5 ki\u1ec7n. \u0110\u1ed1i v\u1edbi thi\u1ebft b\u1ecb c\u1ea3i t\u1ea1o, c\u1ea7n ki\u1ec3m tra k\u00edch th\u01b0\u1edbc l\u1eafp \u0111\u1eb7t, v\u1ecb tr\u00ed \u0111\u01b0a c\u00e1p v\u00e0o, b\u1ed1 tr\u00ed \u0111\u1ea7u c\u1ef1c, d\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng v\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ph\u00eda ngu\u1ed3n tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng.<\/p>\n<h2>Nh\u1eefng g\u00ec k\u1ebft qu\u1ea3 Google hi\u1ec7n t\u1ea1i th\u01b0\u1eddng nh\u1ea5n m\u1ea1nh<\/h2><p>\u0110\u00e1nh gi\u00e1 c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 20 k\u1ebft qu\u1ea3 h\u00e0ng \u0111\u1ea7u hi\u1ec7n t\u1ea1i t\u1ea1i Hoa K\u1ef3 cho th\u1ea5y n\u1ed9i dung \u0111\u1ec1 c\u1eadp l\u1eb7p \u0111i l\u1eb7p l\u1ea1i v\u1ec1 Bi\u1ebfn \u00e1p l\u00e0 g\u00ec?, M\u00e1y bi\u1ebfn \u00e1p 75 kVA ch\u1ecbu \u0111\u01b0\u1ee3c bao nhi\u00eau ampe?, M\u00e1y bi\u1ebfn \u00e1p 75 kVA l\u00e0 g\u00ec?, M\u00e1y bi\u1ebfn \u00e1p 75 kVA n\u1eb7ng bao nhi\u00eau?, M\u00e1y bi\u1ebfn \u00e1p g\u1eafn c\u1ed9t m\u1ed9t pha 75 kVA. H\u01b0\u1edbng d\u1eabn n\u00e0y t\u00edch h\u1ee3p c\u00e1c \u0111i\u1ec3m quy\u1ebft \u0111\u1ecbnh \u0111\u00f3 \u0111\u1ed3ng th\u1eddi gi\u1eef cho ph\u1ea1m vi t\u1eadp trung v\u00e0o vi\u1ec7c mua s\u1eafm c\u00f4ng nghi\u1ec7p v\u00e0 m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt.<\/p>\n<h2>Thi\u1ebft b\u1ecb LBAJI li\u00ean quan<\/h2><p>Xem l\u1ea1i ph\u1ea7n li\u00ean quan <a href=\"https:\/\/lbajiele.com\/vi\/danh-muc-san-pham\/transformer\/\">D\u1ea3i s\u1ea3n ph\u1ea9m LBAJI<\/a> v\u00e0 ph\u1ea7n h\u1ed7 tr\u1ee3 <a href=\"https:\/\/lbajiele.com\/vi\/blog\/complete-guide-to-transformer-capacity-size-dimensions\/\">H\u01b0\u1edbng d\u1eabn c\u1ed1t l\u00f5i v\u1ec1 Dung l\u01b0\u1ee3ng, K\u00edch th\u01b0\u1edbc &amp; Chi\u1ec1u c\u1ee7a M\u00e1y bi\u1ebfn \u00e1p<\/a>. Vui l\u00f2ng g\u1eedi s\u01a1 \u0111\u1ed3 m\u1ed9t s\u1ee3i, th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c, s\u1ed1 l\u01b0\u1ee3ng v\u00e0 \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng cho c\u1ea5u h\u00ecnh d\u00e0nh ri\u00eang cho d\u1ef1 \u00e1n.<\/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-decision-aid\"><h2>Quy tr\u00ecnh \u0110\u00e1nh gi\u00e1 Th\u1ef1c t\u1ebf<\/h2><p>\u0110\u1ed1i v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n (am-pe) c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p 75 kva, h\u00e3y s\u1eed d\u1ee5ng quy tr\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a thay v\u00ec ch\u1ec9 l\u1ef1a ch\u1ecdn theo catalogue. \u0110\u1ea7u ti\u00ean, c\u1ed1 \u0111\u1ecbnh c\u00e1c th\u00f4ng s\u1ed1 \u0111\u1ea7u v\u00e0o c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 gi\u1edbi h\u1ea1n v\u1eadn h\u00e0nh. Ti\u1ebfp theo, so s\u00e1nh c\u00e1c t\u00f9y ch\u1ecdn c\u1ea5u t\u1ea1o ho\u1eb7c d\u1ecbch v\u1ee5 kh\u1ea3 d\u1ee5ng v\u1edbi m\u00f4i tr\u01b0\u1eddng th\u1ef1c t\u1ebf. Sau \u0111\u00f3, x\u00e1c minh c\u00e1c ph\u00e9p t\u00ednh, giao di\u1ec7n b\u1ea3o v\u1ec7 v\u00e0 c\u00e1c b\u00e0i ki\u1ec3m tra nghi\u1ec7m thu. Cu\u1ed1i c\u00f9ng, ghi l\u1ea1i c\u00e1c sai l\u1ec7ch \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t v\u00e0 l\u01b0u gi\u1eef c\u00e1c k\u1ebft qu\u1ea3 c\u01a1 s\u1edf cho c\u00f4ng t\u00e1c ch\u1ea1y th\u1eed v\u00e0 b\u1ea3o tr\u00ec.<\/p><ol><li>Xem l\u1ea1i d\u00f2ng \u0111i\u1ec7n \u0111\u1ea7y \u0111\u1ee7 75 kVA th\u00f4ng th\u01b0\u1eddng v\u00e0 ghi l\u1ea1i quy\u1ebft \u0111\u1ecbnh c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n.<\/li><li>Xem l\u1ea1i b\u1ed9 khu\u1ebfch \u0111\u1ea1i ch\u00ednh v\u00e0 ph\u1ee5 v\u00e0 ghi l\u1ea1i quy\u1ebft \u0111\u1ecbnh c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n.<\/li><li>Xem x\u00e9t k\u00edch th\u01b0\u1edbc c\u1ea7u dao v\u00e0 d\u00e2y d\u1eabn, \u0111\u1ed3ng th\u1eddi ghi l\u1ea1i quy\u1ebft \u0111\u1ecbnh c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n.<\/li><li>\u0110\u00e1nh gi\u00e1 m\u00e1y 75 kVA c\u00f3 \u0111\u1ee7 l\u1edbn kh\u00f4ng? v\u00e0 ghi l\u1ea1i quy\u1ebft \u0111\u1ecbnh c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n.<\/li><\/ol><\/section><section class=\"lbaji-acceptance-records\"><h2>H\u1ed3 s\u01a1 nghi\u1ec7m thu c\u1ea7n l\u01b0u gi\u1eef<\/h2><p>L\u01b0u gi\u1eef b\u1ea3ng d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t, c\u00e1c b\u1ea3n v\u1ebd, danh s\u00e1ch sai l\u1ec7ch, ch\u1ee9ng ch\u1ec9 v\u1eadt li\u1ec7u (n\u1ebfu c\u00f3), b\u00e1o c\u00e1o th\u1eed nghi\u1ec7m \u0111\u1ecbnh k\u1ef3 v\u00e0 th\u1eed nghi\u1ec7m \u0111\u1eb7c bi\u1ec7t, c\u00e0i \u0111\u1eb7t b\u1ea3o v\u1ec7, k\u1ebft qu\u1ea3 ch\u1ea1y th\u1eed nghi\u1ec7m, h\u00ecnh \u1ea3nh v\u00e0 chi ti\u1ebft nh\u00e3n m\u00e1c cu\u1ed1i c\u00f9ng. Ghi l\u1ea1i c\u00e1c \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m c\u0169ng nh\u01b0 c\u00e1c gi\u00e1 tr\u1ecb, v\u00ec nhi\u1ec7t \u0111\u1ed9, ph\u01b0\u01a1ng ph\u00e1p \u0111o v\u00e0 k\u1ebft n\u1ed1i c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn k\u1ebft qu\u1ea3 so s\u00e1nh. C\u00e1c t\u00e0i li\u1ec7u n\u00e0y thi\u1ebft l\u1eadp c\u01a1 s\u1edf ban \u0111\u1ea7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111i\u1ec1u tra c\u00e1c c\u1ea3nh b\u00e1o, thay \u0111\u1ed5i t\u1ea3i tr\u1ecdng ho\u1eb7c s\u1ef1 xu\u1ed1ng c\u1ea5p trong t\u01b0\u01a1ng lai. Ch\u00fang c\u0169ng ng\u0103n ch\u1eb7n t\u00ecnh tr\u1ea1ng \u0111\u1eb7t h\u00e0ng thi\u1ebft b\u1ecb thay th\u1ebf d\u1ef1a tr\u00ean m\u00f4 t\u1ea3 kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7 sau khi nh\u00e2n s\u1ef1 ho\u1eb7c nh\u00e0\u4f9b\u5e94 thay \u0111\u1ed5i.<\/p><\/section><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:\/\/www.energy.gov\/cmei\/buildings\/distribution-transformers\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">T\u00e0i nguy\u00ean m\u00e1y bi\u1ebfn \u00e1p ph\u00e2n ph\u1ed1i c\u1ee7a B\u1ed9 N\u0103ng l\u01b0\u1ee3ng Hoa K\u1ef3<\/a><\/li><li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/588\" rel=\"noopener noreferrer nofollow\" target=\"_blank\">M\u00e1y bi\u1ebfn \u00e1p l\u1ef1c IEC 60076-1<\/a><\/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 \u0111i\u1ec7n NFPA<\/a><\/li><\/ul><\/section>\n<h2>K\u1ebft lu\u1eadn<\/h2><p>M\u00e1y bi\u1ebfn \u00e1p 75 kVA kh\u00f4ng c\u00f3 m\u1ed9t \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n c\u1ed1 \u0111\u1ecbnh. D\u00f2ng \u0111i\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o pha v\u00e0 \u0111i\u1ec7n \u00e1p: d\u00f2ng \u0111i\u1ec7n m\u1ed9t pha l\u00e0 75.000 \u00f7 V; d\u00f2ng \u0111i\u1ec7n d\u00e2y ba pha l\u00e0 75.000 \u00f7 (1,732 \u00d7 V). V\u00ed d\u1ee5, 75 kVA t\u01b0\u01a1ng \u0111\u01b0\u01a1ng kho\u1ea3ng 90,2 A \u1edf \u0111i\u1ec7n \u00e1p ba pha 480 V v\u00e0 208,4 A \u1edf \u0111i\u1ec7n \u00e1p ba pha 208 V. H\u00e3y s\u1eed d\u1ee5ng d\u1eef li\u1ec7u d\u1ef1 \u00e1n v\u00e0 c\u00e1c ti\u00eau ch\u00ed nghi\u1ec7m thu \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a tr\u01b0\u1edbc khi mua s\u1eafm, l\u1eafp \u0111\u1eb7t ho\u1eb7c b\u1ea3o tr\u00ec.<\/p>","protected":false},"excerpt":{"rendered":"<p>Bi\u1ebfn \u00e1p 75 kVA kh\u00f4ng c\u00f3 m\u1ed9t \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n c\u1ed1 \u0111\u1ecbnh. D\u00f2ng \u0111i\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o pha v\u00e0 \u0111i\u1ec7n \u00e1p: d\u00f2ng \u0111i\u1ec7n m\u1ed9t pha l\u00e0 75.000 \u00f7 V; d\u00f2ng \u0111i\u1ec7n d\u00e2y ba pha l\u00e0 75.000 \u00f7 (1,732 \u00d7 V). V\u00ed d\u1ee5, 75 kVA t\u01b0\u01a1ng \u0111\u01b0\u01a1ng kho\u1ea3ng 90,2 A \u1edf\u2026<\/p>","protected":false},"author":6,"featured_media":2721,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[52],"tags":[85,66,65],"class_list":["post-2722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-transformers","tag-kva-calculations","tag-transformer-capacity","tag-transformer-sizing"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2722","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=2722"}],"version-history":[{"count":2,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2722\/revisions"}],"predecessor-version":[{"id":2807,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2722\/revisions\/2807"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media\/2721"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media?parent=2722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/categories?post=2722"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/tags?post=2722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}