{"id":26337,"date":"2022-08-19T15:34:18","date_gmt":"2022-08-19T08:34:18","guid":{"rendered":"https:\/\/hocvienit.vn\/?p=26337"},"modified":"2024-07-02T02:11:45","modified_gmt":"2024-07-01T19:11:45","slug":"dong-dien-dinh-muc-la-gi-cong-thuc-tinh-dong-dien-dinh-muc","status":"publish","type":"post","link":"https:\/\/hocvienit.vn\/?p=26337","title":{"rendered":"D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c"},"content":{"rendered":"

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c l\u00e0 g\u00ec?<\/strong> C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c nh\u01b0 th\u1ebf n\u00e0o? T\u1ea5t c\u1ea3 s\u1ebd \u0111\u01b0\u1ee3c H\u1ecdc vi\u1ec7n iT.vn gi\u1ea3i \u0111\u00e1p chi ti\u1ebft trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/span><\/p>\n

\"D\u00f2ng
D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c<\/span><\/figcaption><\/figure>\n

Xem th\u00eam:\u00a0D\u00f2ng \u0111i\u1ec7n l\u00e0 g\u00ec? C\u00e1ch \u0111o d\u00f2ng \u0111i\u1ec7n<\/a><\/span><\/p><\/blockquote>\n

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c l\u00e0 g\u00ec?<\/strong><\/span><\/h2>\n

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c (Hay c\u00f2n c\u00f3 t\u00ean g\u1ecdi kh\u00e1c l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c) l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng cho bi\u1ebft gi\u1edbi h\u1ea1n c\u1ee7a d\u00f2ng \u0111i\u1ec7n v\u1edbi thi\u1ebft b\u1ecb. N\u1ebfu v\u01b0\u1ee3t qu\u00e1 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c th\u00ec thi\u1ebft b\u1ecb s\u1ebd d\u1ec5 b\u1ecb h\u1ecfng h\u00f3c, ch\u00e1y n\u1ed5.<\/span><\/p>\n

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 Ampere, k\u00ed hi\u1ec7u l\u00e0 A.<\/span><\/p>\n

\u0110i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n

Tr\u01b0\u1edbc ti\u00ean, \u0111\u1ec3 hi\u1ec3u c\u00e1ch \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c, ch\u00fang ta c\u1ea7n hi\u1ec3u \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c l\u00e0 g\u00ec. \u0110i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c l\u00e0 gi\u00e1 tr\u1ecb t\u1ed1i \u0111a c\u1ee7a \u0111i\u1ec7n \u00e1p m\u00e0 m\u1ed9t thi\u1ebft b\u1ecb ho\u1eb7c d\u00e2y d\u1eabn c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng m\u1ed9t c\u00e1ch \u1ed5n \u0111\u1ecbnh v\u00e0 an to\u00e0n.<\/p>\n

C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c l\u00e0 ch\u1ec9 s\u1ed1 cho bi\u1ebft c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ed1i \u0111a m\u00e0 m\u1ed9t thi\u1ebft b\u1ecb ho\u1eb7c d\u00e2y d\u1eabn c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng trong \u0111i\u1ec1u ki\u1ec7n ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng m\u00e0 kh\u00f4ng g\u00e2y ra s\u1ef1 c\u1ed1 ho\u1eb7c h\u1ecfng h\u00f3c.<\/p>\n

\u0110i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c c\u00f3 m\u1ed1i quan h\u1ec7 ngh\u1ecbch bi\u1ebfn. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 khi \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c t\u0103ng, c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c gi\u1ea3m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. \u0110\u00e2y l\u00e0 nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a c\u00f4ng th\u1ee9c t\u00ednh c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c.<\/p>\n

C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c<\/strong><\/span><\/h2>\n

Ta c\u00f3 th\u1ec3 t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c theo c\u00f4ng th\u1ee9c sau:<\/span><\/p>\n

\u00a0I = P\/U<\/strong><\/span><\/p>\n

Trong \u0111\u00f3:<\/span><\/p>\n

I<\/strong>: La\u0300 c\u01b0\u01a1\u0300ng \u0111\u00f4\u0323 c\u1ee7a do\u0300ng \u0111i\u00ea\u0323n \u0111i\u0323nh m\u01b0\u0301c, \u0111\u01a1n v\u1ecb A<\/span><\/p>\n

P<\/strong>: La\u0300 c\u00f4ng su\u1ea5t \u0111i\u1ec7n, \u0111\u01a1n v\u1ecb W<\/span><\/p>\n

U<\/strong>: L\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf, \u0111\u01a1n v\u1ecb V<\/span><\/p>\n

C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 3 pha\u00a0<\/span><\/h3>\n

\u0110\u1ec3 t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 3 pha, ta c\u00f3 th\u1ec3 t\u00ednh theo m\u1ed9t trong hai c\u00e1ch sau:<\/span><\/p>\n

C\u00e1ch 1: C\u00e1ch t\u00ednh t\u01b0\u01a1ng \u0111\u1ed1i<\/span><\/strong><\/h4>\n

C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 3 pha t\u01b0\u01a1ng \u0111\u1ed1i nh\u01b0 sau:<\/span><\/p>\n

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c = C\u00f4ng su\u1ea5t \u0111\u1ed9ng c\u01a1\u00a0 x 2<\/strong><\/span><\/p>\n

C\u00e1ch 2: C\u00e1ch t\u00ednh ch\u00ednh x\u00e1c<\/span><\/strong><\/h4>\n

C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 3 pha ch\u00ednh x\u00e1c nh\u01b0 sau:<\/span><\/p>\n

I = P\/ (c\u0103n 3 x U x cosphi x hi\u1ec7u su\u1ea5t)<\/strong><\/span><\/p>\n

Trong \u0111\u00f3:<\/span><\/p>\n

I<\/strong> la\u0300 d\u00f2ng \u0111i\u1ec7n \u0111i\u0323nh m\u01b0\u0301c cu\u0309a d\u00e2y d\u00e2\u0303n (A)<\/span><\/p>\n

P<\/strong> la\u0300 c\u00f4ng su\u1ea5t \u0111i\u00ea\u0323n (W)<\/span><\/p>\n

U<\/strong> la\u0300 \u0111i\u1ec7n \u00e1p (380 V)<\/span><\/p>\n

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c c\u1ee7a c\u00e1p nh\u00f4m v\u1eb7n xo\u1eafn<\/span><\/h3>\n
\"D\u00f2ng
D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c c\u1ee7a c\u00e1p nh\u00f4m v\u1eb7n xo\u1eafn<\/span><\/figcaption><\/figure>\n

Ba\u0309ng tra do\u0300ng \u0111i\u00ea\u0323n \u0111i\u0323nh m\u01b0\u0301c cu\u0309a ca\u0301p nh\u00f4m v\u1eb7n xo\u1eafn:<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n
Ti\u00ea\u0301n di\u00ea\u0323n ru\u00f4\u0323t d\u00e2\u0303n (mm2)<\/span><\/td>\nDo\u0300ng \u0111i\u00ea\u0323n \u0111i\u0323nh m\u01b0\u0301c (A)<\/span><\/td>\n<\/tr>\n
16<\/span><\/td>\n78<\/span><\/td>\n<\/tr>\n
25<\/span><\/td>\n105<\/span><\/td>\n<\/tr>\n
35<\/span><\/td>\n125<\/span><\/td>\n<\/tr>\n
70<\/span><\/td>\n185<\/span><\/td>\n<\/tr>\n
95<\/span><\/td>\n225<\/span><\/td>\n<\/tr>\n
120<\/span><\/td>\n260<\/span><\/td>\n<\/tr>\n
150<\/span><\/td>\n285<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c c\u1ee7a c\u00e1p \u0111\u1ed3ng<\/span><\/h3>\n
\"D\u00f2ng
D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c c\u1ee7a c\u00e1p \u0111\u1ed3ng<\/span><\/figcaption><\/figure>\n

Ba\u0309ng tra do\u0300ng \u0111i\u00ea\u0323n \u0111i\u0323nh m\u01b0\u0301c cu\u0309a ca\u0301p \u0111\u1ed3ng<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Ti\u00ea\u0301n di\u00ea\u0323n ru\u00f4\u0323t d\u00e2\u0303n (mm2)<\/span><\/td>\nS\u00f4\u0301 d\u00e2y lo\u0303i<\/span><\/td>\nDo\u0300ng \u0111i\u00ea\u0323n \u0111i\u0323nh m\u01b0\u0301c (A)<\/span><\/td>\n<\/tr>\n
1.5<\/span><\/td>\n2<\/span><\/td>\n22<\/span><\/td>\n<\/tr>\n
2.5<\/span><\/td>\n2<\/span><\/td>\n29<\/span><\/td>\n<\/tr>\n
4<\/span><\/td>\n2<\/span><\/td>\n38<\/span><\/td>\n<\/tr>\n
6<\/span><\/td>\n2<\/span><\/td>\n45<\/span><\/td>\n<\/tr>\n
10<\/span><\/td>\n2<\/span><\/td>\n68<\/span><\/td>\n<\/tr>\n
16<\/span><\/td>\n2<\/span><\/td>\n91<\/span><\/td>\n<\/tr>\n
25<\/span><\/td>\n2<\/span><\/td>\n122<\/span><\/td>\n<\/tr>\n
35<\/span><\/td>\n2<\/span><\/td>\n149<\/span><\/td>\n<\/tr>\n
50<\/span><\/td>\n2<\/span><\/td>\n182<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tr\u00ean \u0111\u00e2y l\u00e0 chia s\u1ebb c\u1ee7a H\u1ecdc vi\u1ec7n iT.vn v\u1ec1 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c. N\u1ebfu c\u00f3 b\u1ea5t c\u1ee9 th\u1eafc m\u1eafc n\u00e0o th\u00ec h\u00e3y \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn ngay b\u00ean d\u01b0\u1edbi b\u00e0i vi\u1ebft n\u00e0y ho\u1eb7c inbox tr\u1ef1c ti\u1ebfp cho H\u1ecdc vi\u1ec7n iT.vn \u0111\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i \u0111\u00e1p t\u1ed1t nh\u1ea5t. Ch\u00fac b\u1ea1n th\u00e0nh c\u00f4ng!<\/span><\/p>\n

C\u00f3 th\u1ec3 b\u1ea1n quan t\u00e2m:\u00a0D\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u l\u00e0 g\u00ec? T\u00e1c d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u<\/a><\/span><\/p><\/blockquote>\n

M\u1ecdi chi ti\u1ebft xin vui l\u00f2ng li\u00ean h\u1ec7:
\n<\/i>C\u00d4NG TY C\u1ed4 PH\u1ea6N H\u1eccC VI\u1ec6N IT
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\nH\u1ecdc vi\u1ec7n IT.vn \u2013 Truy\u1ec1n ngh\u1ec1 th\u1ef1c t\u1ebf c\u00f9ng b\u1ea1n \u0111\u1ebfn th\u00e0nh c\u00f4ng!\u00a0<\/i><\/strong><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c nh\u01b0 th\u1ebf n\u00e0o? T\u1ea5t c\u1ea3 s\u1ebd \u0111\u01b0\u1ee3c H\u1ecdc vi\u1ec7n iT.vn gi\u1ea3i \u0111\u00e1p chi ti\u1ebft trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n","protected":false},"author":95,"featured_media":26338,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95,94],"tags":[653],"_links":{"self":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/26337"}],"collection":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/users\/95"}],"replies":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=26337"}],"version-history":[{"count":0,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/26337\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/media\/26338"}],"wp:attachment":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=26337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=26337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=26337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}