{"id":6736,"date":"2026-09-12T09:30:47","date_gmt":"2026-09-12T02:30:47","guid":{"rendered":"https:\/\/sunnysolar.vn\/?p=6736"},"modified":"2026-09-12T09:34:01","modified_gmt":"2026-09-12T02:34:01","slug":"tinh-sut-ap-dien-1-pha-cong-thuc-cach-tinh","status":"publish","type":"post","link":"https:\/\/sunnysolar.vn\/en\/tinh-sut-ap-dien-1-pha-cong-thuc-cach-tinh\/","title":{"rendered":"T\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha: C\u00f4ng th\u1ee9c & V\u00ed d\u1ee5 chi ti\u1ebft"},"content":{"rendered":"

T\u00cdNH S\u1ee4T \u00c1P \u0110I\u1ec6N 1 PHA: C\u00d4NG TH\u1ee8C, C\u00c1CH T\u00cdNH V\u00c0 V\u00cd D\u1ee4 TH\u1ef0C T\u1ebe<\/h1>\n

\"\"<\/p>\n

\n

T\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha: C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh chi ti\u1ebft<\/h1>\n

S\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha<\/strong> l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 quan tr\u1ecdng c\u1ea7n ki\u1ec3m tra khi thi\u1ebft k\u1ebf v\u00e0 l\u1ef1a ch\u1ecdn d\u00e2y d\u1eabn cho h\u1ec7 th\u1ed1ng \u0111i\u1ec7n. Khi chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng d\u00e2y l\u1edbn ho\u1eb7c d\u00f2ng t\u1ea3i cao, \u0111i\u1ec7n \u00e1p t\u1ea1i cu\u1ed1i \u0111\u01b0\u1eddng d\u00e2y c\u00f3 th\u1ec3 th\u1ea5p h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi \u0111i\u1ec7n \u00e1p t\u1ea1i \u0111\u1ea7u ngu\u1ed3n.<\/p>\n

N\u1ebfu m\u1ee9c s\u1ee5t \u00e1p qu\u00e1 l\u1edbn, thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng \u1ed5n \u0111\u1ecbnh, gi\u1ea3m hi\u1ec7u su\u1ea5t ho\u1eb7c th\u1eadm ch\u00ed \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tu\u1ed5i th\u1ecd thi\u1ebft b\u1ecb.<\/p>\n

B\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y h\u01b0\u1edbng d\u1eabn c\u00e1ch t\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha<\/strong> theo c\u00f4ng th\u1ee9c th\u1ec3 hi\u1ec7n trong h\u00ecnh \u1ea3nh, \u0111\u1ed3ng th\u1eddi th\u1ef1c hi\u1ec7n m\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3 v\u1edbi c\u00e1p \u0111\u1ed3ng 50 mm\u00b2, chi\u1ec1u d\u00e0i 100 m, d\u00f2ng \u0111i\u1ec7n 100 A v\u00e0 \u0111i\u1ec7n \u00e1p 230 V<\/strong>.<\/p>\n

\n

1. S\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha l\u00e0 g\u00ec?<\/h2>\n

S\u1ee5t \u00e1p (Voltage Drop)<\/strong> l\u00e0 \u0111\u1ed9 ch\u00eanh l\u1ec7ch \u0111i\u1ec7n \u00e1p gi\u1eefa \u0111\u1ea7u ngu\u1ed3n v\u00e0 cu\u1ed1i \u0111\u01b0\u1eddng d\u00e2y khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn.<\/p>\n

Trong th\u1ef1c t\u1ebf, d\u00e2y d\u1eabn lu\u00f4n c\u00f3 \u0111i\u1ec7n tr\u1edf v\u00e0 \u0111i\u1ec7n kh\u00e1ng. Khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua, m\u1ed9t ph\u1ea7n \u0111i\u1ec7n \u00e1p b\u1ecb gi\u1ea3m tr\u00ean \u0111\u01b0\u1eddng d\u00e2y.<\/p>\n

C\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01a1n gi\u1ea3n:<\/p>\n

\u0110i\u1ec7n \u00e1p cu\u1ed1i t\u1ea3i = \u0110i\u1ec7n \u00e1p ngu\u1ed3n \u2013 \u0110i\u1ec7n \u00e1p s\u1ee5t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/strong><\/p>\n

V\u00ec v\u1eady, khi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng \u0111i\u1ec7n, vi\u1ec7c t\u00ednh to\u00e1n s\u1ee5t \u00e1p gi\u00fap x\u00e1c \u0111\u1ecbnh ti\u1ebft di\u1ec7n c\u00e1p ph\u00f9 h\u1ee3p<\/strong>, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi c\u00e1c \u0111\u01b0\u1eddng d\u00e2y c\u00f3 chi\u1ec1u d\u00e0i l\u1edbn.<\/p>\n

\n

2. C\u00e1c th\u00f4ng s\u1ed1 c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u00ednh s\u1ee5t \u00e1p<\/h1>\n

Theo v\u00ed d\u1ee5 trong h\u00ecnh \u1ea3nh, c\u00e1c d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o g\u1ed3m:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Th\u00f4ng s\u1ed1<\/th>\nGi\u00e1 tr\u1ecb<\/th>\n<\/tr>\n<\/thead>\n
Ti\u1ebft di\u1ec7n c\u00e1p<\/strong><\/td>\n50 mm\u00b2<\/td>\n<\/tr>\n
V\u1eadt li\u1ec7u d\u00e2y d\u1eabn<\/strong><\/td>\n\u0110\u1ed3ng<\/td>\n<\/tr>\n
Chi\u1ec1u d\u00e0i c\u00e1p<\/strong><\/td>\n100 m<\/td>\n<\/tr>\n
D\u00f2ng \u0111i\u1ec7n t\u1ea3i (I)<\/strong><\/td>\n100 A<\/td>\n<\/tr>\n
\u0110i\u1ec7n \u00e1p (V)<\/strong><\/td>\n230 V<\/td>\n<\/tr>\n
\u0110i\u1ec7n tr\u1edf d\u00e2y d\u1eabn (R)<\/strong><\/td>\n0,387 \u03a9\/km<\/td>\n<\/tr>\n
\u0110i\u1ec7n kh\u00e1ng (X)<\/strong><\/td>\n0,08 \u03a9\/km<\/td>\n<\/tr>\n
H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t (cos \u03c6)<\/strong><\/td>\n0,8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e1c th\u00f4ng s\u1ed1 n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh \u0111\u1ed9 s\u1ee5t \u00e1p t\u00ednh theo Volt<\/strong> v\u00e0 sau \u0111\u00f3 quy \u0111\u1ed5i th\u00e0nh ph\u1ea7n tr\u0103m s\u1ee5t \u00e1p<\/strong>.<\/p>\n

\n

3. C\u00f4ng th\u1ee9c t\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha<\/h1>\n

Theo n\u1ed9i dung trong h\u00ecnh, c\u00f4ng th\u1ee9c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0:<\/p>\n

 <\/p>\n

V<\/mi>d<\/mi><\/msub>=<\/mo>2<\/mn>\u00d7<\/mo>I<\/mi>\u00d7<\/mo>L<\/mi>\u00d7<\/mo>(<\/mo>R<\/mi>cos<\/mi>\u2061<\/mo>\u03c6<\/mi>+<\/mo>X<\/mi>sin<\/mi>\u2061<\/mo>\u03c6<\/mi>)<\/mo><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

 <\/p>\n

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

    \n
  • Vd:<\/strong> \u0110\u1ed9 s\u1ee5t \u00e1p, \u0111\u01a1n v\u1ecb V<\/li>\n
  • I:<\/strong> D\u00f2ng \u0111i\u1ec7n t\u1ea3i, \u0111\u01a1n v\u1ecb A<\/li>\n
  • L:<\/strong> Chi\u1ec1u d\u00e0i c\u00e1p, \u0111\u01a1n v\u1ecb km<\/li>\n
  • R:<\/strong> \u0110i\u1ec7n tr\u1edf d\u00e2y d\u1eabn, \u0111\u01a1n v\u1ecb \u03a9\/km<\/li>\n
  • X:<\/strong> \u0110i\u1ec7n kh\u00e1ng d\u00e2y d\u1eabn, \u0111\u01a1n v\u1ecb \u03a9\/km<\/li>\n
  • cos \u03c6:<\/strong> H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t<\/li>\n
  • sin \u03c6:<\/strong> H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t ph\u1ea3n kh\u00e1ng<\/li>\n<\/ul>\n

    L\u01b0u \u00fd v\u1ec1 chi\u1ec1u d\u00e0i d\u00e2y<\/h3>\n

    Do \u0111i\u1ec7n tr\u1edf v\u00e0 \u0111i\u1ec7n kh\u00e1ng trong v\u00ed d\u1ee5 \u0111\u01b0\u1ee3c t\u00ednh theo \u03a9\/km<\/strong>, chi\u1ec1u d\u00e0i 100 m c\u1ea7n \u0111\u01b0\u1ee3c \u0111\u1ed5i sang km:<\/p>\n

     <\/p>\n

    100<\/mn>m<\/mi>=<\/mo>0<\/mn>,<\/mo>1<\/mn>k<\/mi>m<\/mi><\/mrow><\/semantics><\/math><\/p>\n

     <\/p>\n

    \u0110\u00e2y l\u00e0 b\u01b0\u1edbc quan tr\u1ecdng \u0111\u1ec3 tr\u00e1nh sai s\u1ed1 khi t\u00ednh to\u00e1n.<\/p>\n

    \n

    4. T\u00ednh sin \u03c6 t\u1eeb h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t<\/h1>\n

    \u0110\u1ec1 b\u00e0i cho:<\/p>\n

     <\/p>\n

    cos<\/mi>\u2061<\/mo>\u03c6<\/mi>=<\/mo>0<\/mn>,<\/mo>8<\/mn><\/mrow><\/semantics><\/math><\/p>\n

     <\/p>\n

    Ta c\u00f3:<\/p>\n

     <\/p>\n

    sin<\/mi>\u2061<\/mo>\u03c6<\/mi>=<\/mo>1<\/mn>\u2212<\/mo>cos<\/mi>\u2061<\/mo><\/mrow>2<\/mn><\/msup>\u03c6<\/mi><\/mrow><\/msqrt><\/mrow><\/semantics><\/math><\/p>\n

     <\/p>\n

    Thay s\u1ed1:<\/p>\n

     <\/p>\n

    sin<\/mi>\u2061<\/mo>\u03c6<\/mi>=<\/mo>1<\/mn>\u2212<\/mo>0<\/mn>,<\/mo>8<\/mn>2<\/mn><\/msup><\/mrow><\/msqrt><\/mrow><\/semantics><\/math><\/p>\n

     <\/p>\n

    =<\/mo>1<\/mn>\u2212<\/mo>0<\/mn>,<\/mo>64<\/mn><\/mrow><\/msqrt><\/mrow><\/semantics><\/math><\/p>\n

     <\/p>\n

    =<\/mo>0<\/mn>,<\/mo>36<\/mn><\/mrow><\/msqrt>=<\/mo>0<\/mn>,<\/mo>6<\/mn><\/mrow><\/semantics><\/math><\/p>\n

     <\/p>\n

    Nh\u01b0 v\u1eady:<\/p>\n

    cos \u03c6 = 0,8<\/strong><\/p>\n

    sin \u03c6 = 0,6<\/strong><\/p>\n

    \n

    5. Thay s\u1ed1 v\u00e0o c\u00f4ng th\u1ee9c t\u00ednh s\u1ee5t \u00e1p<\/h1>\n

    C\u00e1c th\u00f4ng s\u1ed1:<\/p>\n

      \n
    • I = 100 A<\/li>\n
    • L = 0,1 km<\/li>\n
    • R = 0,387 \u03a9\/km<\/li>\n
    • X = 0,08 \u03a9\/km<\/li>\n
    • cos \u03c6 = 0,8<\/li>\n
    • sin \u03c6 = 0,6<\/li>\n<\/ul>\n

      C\u00f4ng th\u1ee9c:<\/p>\n

       <\/p>\n

      V<\/mi>d<\/mi><\/msub>=<\/mo>2<\/mn>\u00d7<\/mo>100<\/mn>\u00d7<\/mo>0<\/mn>,<\/mo>1<\/mn>\u00d7<\/mo>(<\/mo>0<\/mn>,<\/mo>387<\/mn>\u00d7<\/mo>0<\/mn>,<\/mo>8<\/mn>+<\/mo>0<\/mn>,<\/mo>08<\/mn>\u00d7<\/mo>0<\/mn>,<\/mo>6<\/mn>)<\/mo><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

      T\u00ednh t\u1eebng th\u00e0nh ph\u1ea7n:<\/p>\n

       <\/p>\n

      0<\/mn>,<\/mo>387<\/mn>\u00d7<\/mo>0<\/mn>,<\/mo>8<\/mn>=<\/mo>0<\/mn>,<\/mo>3096<\/mn><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

      0<\/mn>,<\/mo>08<\/mn>\u00d7<\/mo>0<\/mn>,<\/mo>6<\/mn>=<\/mo>0<\/mn>,<\/mo>048<\/mn><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

      Do \u0111\u00f3:<\/p>\n

       <\/p>\n

      V<\/mi>d<\/mi><\/msub>=<\/mo>20<\/mn>\u00d7<\/mo>(<\/mo>0<\/mn>,<\/mo>3096<\/mn>+<\/mo>0<\/mn>,<\/mo>048<\/mn>)<\/mo><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

      V<\/mi>d<\/mi><\/msub>=<\/mo>20<\/mn>\u00d7<\/mo>0<\/mn>,<\/mo>3576<\/mn><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

      V<\/mi>d<\/mi><\/msub>\u2248<\/mo>7<\/mn>,<\/mo>15<\/mn>V<\/mi><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

      K\u1ebft qu\u1ea3<\/h3>\n

      \u0110\u1ed9 s\u1ee5t \u00e1p c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y \u2248 7,15 V.<\/strong><\/p>\n

      \n

      6. C\u00e1ch t\u00ednh ph\u1ea7n tr\u0103m s\u1ee5t \u00e1p<\/h1>\n

      Sau khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9 s\u1ee5t \u00e1p theo Volt, ta t\u00ednh t\u1ef7 l\u1ec7 s\u1ee5t \u00e1p:<\/p>\n

       <\/p>\n

      %<\/mi>V<\/mi>o<\/mi>l<\/mi>t<\/mi>a<\/mi>g<\/mi>e<\/mi>\u00a0<\/mtext>D<\/mi>r<\/mi>o<\/mi>p<\/mi>=<\/mo>V<\/mi>d<\/mi><\/msub>V<\/mi><\/mfrac>\u00d7<\/mo>100<\/mn><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

       <\/p>\n

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

        \n
      • Vd:<\/strong> \u0110\u1ed9 s\u1ee5t \u00e1p<\/li>\n
      • V:<\/strong> \u0110i\u1ec7n \u00e1p \u0111\u01b0\u1eddng d\u00e2y<\/li>\n<\/ul>\n

        V\u1edbi:<\/p>\n

          \n
        • Vd = 7,15 V<\/li>\n
        • V = 230 V<\/li>\n<\/ul>\n

          Ta c\u00f3:<\/p>\n

           <\/p>\n

          %<\/mi>V<\/mi>o<\/mi>l<\/mi>t<\/mi>a<\/mi>g<\/mi>e<\/mi>\u00a0<\/mtext>D<\/mi>r<\/mi>o<\/mi>p<\/mi>=<\/mo>7<\/mn>,<\/mo>15<\/mn><\/mrow>230<\/mn><\/mfrac>\u00d7<\/mo>100<\/mn><\/mrow><\/semantics><\/math><\/p>\n

           <\/p>\n

          %<\/mi>V<\/mi>o<\/mi>l<\/mi>t<\/mi>a<\/mi>g<\/mi>e<\/mi>\u00a0<\/mtext>D<\/mi>r<\/mi>o<\/mi>p<\/mi>\u2248<\/mo>3<\/mn>,<\/mo>11<\/mn>%<\/mi><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

           <\/p>\n

          Nh\u01b0 v\u1eady, \u0111\u01b0\u1eddng d\u00e2y trong v\u00ed d\u1ee5 c\u00f3 m\u1ee9c s\u1ee5t \u00e1p kho\u1ea3ng 3,11%<\/strong>.<\/p>\n

          \n

          7. K\u1ebft qu\u1ea3 t\u00ednh s\u1ee5t \u00e1p c\u00e1p 50 mm\u00b2<\/h1>\n

          T\u1ed5ng h\u1ee3p k\u1ebft qu\u1ea3:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
          N\u1ed9i dung<\/th>\nK\u1ebft qu\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
          Ti\u1ebft di\u1ec7n c\u00e1p<\/td>\n50 mm\u00b2<\/strong><\/td>\n<\/tr>\n
          V\u1eadt li\u1ec7u<\/td>\n\u0110\u1ed3ng<\/strong><\/td>\n<\/tr>\n
          Chi\u1ec1u d\u00e0i<\/td>\n100 m<\/strong><\/td>\n<\/tr>\n
          D\u00f2ng t\u1ea3i<\/td>\n100 A<\/strong><\/td>\n<\/tr>\n
          \u0110i\u1ec7n \u00e1p ngu\u1ed3n<\/td>\n230 V<\/strong><\/td>\n<\/tr>\n
          H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t<\/td>\ncos \u03c6 = 0,8<\/strong><\/td>\n<\/tr>\n
          sin \u03c6<\/td>\n0,6<\/strong><\/td>\n<\/tr>\n
          \u0110i\u1ec7n tr\u1edf<\/td>\n0,387 \u03a9\/km<\/strong><\/td>\n<\/tr>\n
          \u0110i\u1ec7n kh\u00e1ng<\/td>\n0,08 \u03a9\/km<\/strong><\/td>\n<\/tr>\n
          \u0110\u1ed9 s\u1ee5t \u00e1p<\/strong><\/td>\n\u2248 7,15 V<\/strong><\/td>\n<\/tr>\n
          T\u1ef7 l\u1ec7 s\u1ee5t \u00e1p<\/strong><\/td>\n\u2248 3,11%<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Theo v\u00ed d\u1ee5 trong h\u00ecnh, m\u1ee9c s\u1ee5t \u00e1p 3,11%<\/strong> n\u1eb1m trong kho\u1ea3ng gi\u1edbi h\u1ea1n ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c 3\u20135%<\/strong>, t\u1eeb \u0111\u00f3 k\u1ebft lu\u1eadn vi\u1ec7c l\u1ef1a ch\u1ecdn c\u00e1p trong v\u00ed d\u1ee5 l\u00e0 ph\u00f9 h\u1ee3p.<\/p>\n

          \n

          8. V\u00ec sao c\u1ea7n ki\u1ec3m tra s\u1ee5t \u00e1p khi ch\u1ecdn d\u00e2y \u0111i\u1ec7n?<\/h1>\n

          Vi\u1ec7c l\u1ef1a ch\u1ecdn d\u00e2y d\u1eabn kh\u00f4ng ch\u1ec9 d\u1ef1a v\u00e0o kh\u1ea3 n\u0103ng ch\u1ecbu d\u00f2ng. S\u1ee5t \u00e1p tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/strong> c\u0169ng l\u00e0 m\u1ed9t ti\u00eau ch\u00ed quan tr\u1ecdng.<\/p>\n

          8.1. \u0110\u1ea3m b\u1ea3o \u0111i\u1ec7n \u00e1p \u0111\u1ebfn thi\u1ebft b\u1ecb<\/h3>\n

          N\u1ebfu d\u00e2y d\u1eabn qu\u00e1 nh\u1ecf ho\u1eb7c \u0111\u01b0\u1eddng d\u00e2y qu\u00e1 d\u00e0i, \u0111i\u1ec7n \u00e1p cu\u1ed1i t\u1ea3i c\u00f3 th\u1ec3 gi\u1ea3m nhi\u1ec1u.<\/p>\n

          \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t \u0111\u00e1ng l\u01b0u \u00fd \u0111\u1ed1i v\u1edbi:<\/p>\n

            \n
          • \u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n<\/li>\n
          • M\u00e1y b\u01a1m<\/li>\n
          • M\u00e1y n\u00e9n<\/li>\n
          • Thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p<\/li>\n
          • H\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng<\/li>\n
          • H\u1ec7 th\u1ed1ng \u0111i\u1ec7n m\u1eb7t tr\u1eddi<\/li>\n
          • Thi\u1ebft b\u1ecb c\u00f3 c\u00f4ng su\u1ea5t l\u1edbn<\/li>\n<\/ul>\n

            8.2. H\u1ea1n ch\u1ebf t\u1ed5n th\u1ea5t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/h3>\n

            D\u00e2y d\u1eabn c\u00f3 \u0111i\u1ec7n tr\u1edf c\u00e0ng l\u1edbn th\u00ec t\u1ed5n th\u1ea5t \u0111i\u1ec7n n\u0103ng c\u00e0ng \u0111\u00e1ng k\u1ec3 khi d\u00f2ng \u0111i\u1ec7n t\u0103ng.<\/p>\n

            \u0110\u1eb7c bi\u1ec7t, v\u1edbi \u0111\u01b0\u1eddng d\u00e2y c\u00f3 chi\u1ec1u d\u00e0i h\u00e0ng ch\u1ee5c ho\u1eb7c h\u00e0ng tr\u0103m m\u00e9t, c\u1ea7n t\u00ednh to\u00e1n k\u1ef9 ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn.<\/p>\n

            8.3. H\u1ed7 tr\u1ee3 l\u1ef1a ch\u1ecdn ti\u1ebft di\u1ec7n c\u00e1p<\/h3>\n

            Th\u00f4ng qua t\u00ednh to\u00e1n s\u1ee5t \u00e1p, ng\u01b0\u1eddi thi\u1ebft k\u1ebf c\u00f3 th\u1ec3 \u0111\u00e1nh gi\u00e1 li\u1ec7u ti\u1ebft di\u1ec7n c\u00e1p hi\u1ec7n t\u1ea1i \u0111\u00e3 ph\u00f9 h\u1ee3p hay c\u1ea7n t\u0103ng ti\u1ebft di\u1ec7n.<\/p>\n

            \n

            9. Nh\u1eefng y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ee5t \u00e1p<\/h1>\n

            M\u1ee9c s\u1ee5t \u00e1p kh\u00f4ng ch\u1ec9 ph\u1ee5 thu\u1ed9c v\u00e0o ti\u1ebft di\u1ec7n d\u00e2y.<\/p>\n

            Chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng d\u00e2y<\/h2>\n

            Chi\u1ec1u d\u00e0i c\u00e0ng l\u1edbn \u2192 s\u1ee5t \u00e1p c\u00e0ng l\u1edbn.<\/strong><\/p>\n

            Do \u0111\u00f3, nh\u1eefng h\u1ec7 th\u1ed1ng c\u00f3 kho\u1ea3ng c\u00e1ch t\u1eeb ngu\u1ed3n \u0111\u1ebfn t\u1ea3i l\u1edbn c\u1ea7n \u0111\u1eb7c bi\u1ec7t ch\u00fa \u00fd \u0111\u1ebfn s\u1ee5t \u00e1p.<\/p>\n

            D\u00f2ng \u0111i\u1ec7n t\u1ea3i<\/h2>\n

            D\u00f2ng \u0111i\u1ec7n c\u00e0ng l\u1edbn \u2192 s\u1ee5t \u00e1p c\u00e0ng l\u1edbn.<\/strong><\/p>\n

            \u0110\u00e2y l\u00e0 l\u00fd do c\u00e1c t\u1ea3i c\u00f4ng su\u1ea5t l\u1edbn th\u01b0\u1eddng y\u00eau c\u1ea7u d\u00e2y d\u1eabn c\u00f3 ti\u1ebft di\u1ec7n ph\u00f9 h\u1ee3p.<\/p>\n

            Ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn<\/h2>\n

            Ti\u1ebft di\u1ec7n d\u00e2y c\u00e0ng l\u1edbn th\u00ec \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y c\u00e0ng nh\u1ecf, t\u1eeb \u0111\u00f3 gi\u00fap gi\u1ea3m s\u1ee5t \u00e1p.<\/p>\n

            V\u1eadt li\u1ec7u d\u00e2y d\u1eabn<\/h2>\n

            \u0110\u1ed3ng v\u00e0 nh\u00f4m c\u00f3 \u0111\u1eb7c t\u00ednh d\u1eabn \u0111i\u1ec7n kh\u00e1c nhau n\u00ean khi thi\u1ebft k\u1ebf c\u1ea7n s\u1eed d\u1ee5ng \u0111\u00fang th\u00f4ng s\u1ed1 \u0111i\u1ec7n tr\u1edf c\u1ee7a lo\u1ea1i c\u00e1p th\u1ef1c t\u1ebf.<\/p>\n

            H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t<\/h2>\n

            Trong c\u00f4ng th\u1ee9c c\u00f3 c\u1ea3 th\u00e0nh ph\u1ea7n:<\/p>\n

             <\/p>\n

            R<\/mi>cos<\/mi>\u2061<\/mo>\u03c6<\/mi><\/mrow><\/semantics><\/math><\/p>\n

             <\/p>\n

            v\u00e0<\/p>\n

             <\/p>\n

            X<\/mi>sin<\/mi>\u2061<\/mo>\u03c6<\/mi><\/mrow><\/semantics><\/math><\/p>\n

             <\/p>\n

            Do \u0111\u00f3 h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t c\u1ee7a t\u1ea3i c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n.<\/p>\n

            \n

            10. C\u00f4ng th\u1ee9c t\u00ednh s\u1ee5t \u00e1p 1 pha c\u1ea7n nh\u1edb<\/h1>\n

            C\u00f4ng th\u1ee9c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong v\u00ed d\u1ee5:<\/p>\n

             <\/p>\n

            V<\/mi>d<\/mi><\/msub>=<\/mo>2<\/mn>\u00d7<\/mo>I<\/mi>\u00d7<\/mo>L<\/mi>\u00d7<\/mo>(<\/mo>R<\/mi>cos<\/mi>\u2061<\/mo>\u03c6<\/mi>+<\/mo>X<\/mi>sin<\/mi>\u2061<\/mo>\u03c6<\/mi>)<\/mo><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

             <\/p>\n

            Sau \u0111\u00f3:<\/p>\n

             <\/p>\n

            %<\/mi>V<\/mi>d<\/mi><\/msub>=<\/mo>V<\/mi>d<\/mi><\/msub>V<\/mi><\/mfrac>\u00d7<\/mo>100<\/mn><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

             <\/p>\n

            Quy tr\u00ecnh t\u00ednh c\u00f3 th\u1ec3 t\u00f3m t\u1eaft th\u00e0nh 5 b\u01b0\u1edbc<\/strong>:<\/p>\n

            B\u01b0\u1edbc 1:<\/strong> X\u00e1c \u0111\u1ecbnh d\u00f2ng \u0111i\u1ec7n t\u1ea3i.
            \nB\u01b0\u1edbc 2:<\/strong> \u0110\u1ed5i chi\u1ec1u d\u00e0i d\u00e2y sang km n\u1ebfu R v\u00e0 X t\u00ednh theo \u03a9\/km.
            \nB\u01b0\u1edbc 3:<\/strong> X\u00e1c \u0111\u1ecbnh R, X v\u00e0 h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t.
            \nB\u01b0\u1edbc 4:<\/strong> T\u00ednh Vd b\u1eb1ng c\u00f4ng th\u1ee9c s\u1ee5t \u00e1p.
            \nB\u01b0\u1edbc 5:<\/strong> T\u00ednh ph\u1ea7n tr\u0103m s\u1ee5t \u00e1p v\u00e0 \u0111\u00e1nh gi\u00e1 k\u1ebft qu\u1ea3.<\/p>\n

            \n

            11. V\u00ed d\u1ee5 th\u1ef1c t\u1ebf: c\u00e1p \u0111\u1ed3ng 50 mm\u00b2 \u2013 100 m \u2013 100 A<\/h1>\n

            V\u1edbi h\u1ec7 th\u1ed1ng:<\/p>\n

            C\u00e1p \u0111\u1ed3ng 50 mm\u00b2 \u2192 d\u00e0i 100 m \u2192 t\u1ea3i 100 A \u2192 230 V \u2192 cos \u03c6 = 0,8<\/strong><\/p>\n

            k\u1ebft qu\u1ea3 theo v\u00ed d\u1ee5:<\/p>\n

             <\/p>\n

            V<\/mi>d<\/mi><\/msub>\u2248<\/mo>7<\/mn>,<\/mo>15<\/mn>V<\/mi><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

             <\/p>\n

            v\u00e0:<\/p>\n

             <\/p>\n

            %<\/mi>V<\/mi>d<\/mi><\/msub>\u2248<\/mo>3<\/mn>,<\/mo>11<\/mn>%<\/mi><\/mrow><\/mstyle><\/mstyle><\/mstyle><\/menclose><\/mrow><\/semantics><\/math><\/p>\n

             <\/p>\n

            Theo ti\u00eau ch\u00ed \u0111\u00e1nh gi\u00e1 \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong h\u00ecnh, m\u1ee9c 3,11%<\/strong> n\u1eb1m trong kho\u1ea3ng 3\u20135%<\/strong>, v\u00ec v\u1eady c\u00e1p \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 ph\u00f9 h\u1ee3p<\/strong> trong v\u00ed d\u1ee5 n\u00e0y.<\/p>\n

            \n

            12. K\u1ebft lu\u1eadn<\/h1>\n

            T\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha<\/strong> l\u00e0 b\u01b0\u1edbc quan tr\u1ecdng khi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng \u0111i\u1ec7n, \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u00e1c \u0111\u01b0\u1eddng d\u00e2y d\u00e0i v\u00e0 t\u1ea3i c\u00f3 d\u00f2ng \u0111i\u1ec7n l\u1edbn.<\/p>\n

            Trong v\u00ed d\u1ee5 v\u1edbi c\u00e1p \u0111\u1ed3ng 50 mm\u00b2, d\u00e0i 100 m, d\u00f2ng \u0111i\u1ec7n 100 A, \u0111i\u1ec7n \u00e1p 230 V v\u00e0 cos \u03c6 = 0,8<\/strong>, \u0111\u1ed9 s\u1ee5t \u00e1p t\u00ednh \u0111\u01b0\u1ee3c kho\u1ea3ng 7,15 V<\/strong>, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng 3,11%<\/strong>.<\/p>\n

            K\u1ebft qu\u1ea3 n\u00e0y theo ti\u00eau ch\u00ed trong h\u00ecnh n\u1eb1m trong kho\u1ea3ng 3\u20135%<\/strong>, cho th\u1ea5y l\u1ef1a ch\u1ecdn c\u00e1p trong v\u00ed d\u1ee5 l\u00e0 ph\u00f9 h\u1ee3p.<\/p>","protected":false},"excerpt":{"rendered":"

            T\u00cdNH S\u1ee4T \u00c1P \u0110I\u1ec6N 1 PHA: C\u00d4NG TH\u1ee8C, C\u00c1CH T\u00cdNH V\u00c0 V\u00cd D\u1ee4 TH\u1ef0C T\u1ebe T\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha: C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh chi ti\u1ebft S\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 quan tr\u1ecdng c\u1ea7n ki\u1ec3m tra khi thi\u1ebft k\u1ebf v\u00e0 l\u1ef1a ch\u1ecdn d\u00e2y d\u1eabn cho h\u1ec7 th\u1ed1ng […]","protected":false},"author":1,"featured_media":6737,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-6736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"yoast_head":"\nT\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha: C\u00f4ng th\u1ee9c & V\u00ed d\u1ee5 chi ti\u1ebft - Sunny Solar<\/title>\n<meta name=\"description\" content=\"H\u01b0\u1edbng d\u1eabn t\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha chi ti\u1ebft v\u1edbi c\u00f4ng th\u1ee9c, \u0111i\u1ec7n tr\u1edf, \u0111i\u1ec7n kh\u00e1ng, h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t v\u00e0 v\u00ed d\u1ee5 c\u00e1p \u0111\u1ed3ng 50mm\u00b2 d\u00e0i 100m, t\u1ea3i 100A.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sunnysolar.vn\/en\/tinh-sut-ap-dien-1-pha-cong-thuc-cach-tinh\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u00ednh s\u1ee5t \u00e1p \u0111i\u1ec7n 1 pha: C\u00f4ng th\u1ee9c & V\u00ed d\u1ee5 chi ti\u1ebft - 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