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{"id":25090,"date":"2018-04-03T16:13:54","date_gmt":"2018-04-03T09:13:54","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=25090"},"modified":"2018-04-03T16:13:54","modified_gmt":"2018-04-03T09:13:54","slug":"chuong-5-bai-32-may-bien-ap-truyen-tai-dien-nang","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/chuong-5-bai-32-may-bien-ap-truyen-tai-dien-nang\/","title":{"rendered":"Ch\u01b0\u01a1ng 5 – B\u00e0i 32: M\u00e1y bi\u1ebfn \u00e1p. Truy\u1ec1n t\u1ea3i \u0111i\u1ec7n n\u0103ng"},"content":{"rendered":"

C\u00c2U H\u1eceI<\/strong><\/p>\n

C\u00e2u 1 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a s\u1ef1 bi\u1ebfn \u0111\u1ed5i \u0111i\u1ec7n \u00e1p v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua m\u00e1y bi\u1ebfn \u00e1p.<\/span><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\u0110i\u1ec7n \u00e1p t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi c\u00e1c v\u00f2ng d\u00e2y:<\/p>\n

$\"\"$ <\/p>\n

N\u1ebfu N_{2<\/sub>\u00a0> N_{1<\/sub>\u00a0th\u00ec U_{2<\/sub>\u00a0> U_{1<\/sub>, ta g\u1ecdi m\u00e1y bi\u1ebfn \u00e1p l\u00e0 m\u00e1y t\u0103ng \u00e1p. N\u1ebfu N_{2<\/sub>\u00a0< N_{1<\/sub>\u00a0th\u00ec U_{2<\/sub>\u00a0< U_{1<\/sub>\u00a0ta g\u1ecdi m\u00e1y bi\u1ebfn \u00e1p l\u00e0 m\u00e1y h\u1ea1 \u00e1p.<\/p>\n}}}}}}}}

C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ef7 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n \u00e1p:<\/p>\n

$\"\"$ <\/p>\n

Do \u0111\u00f3, m\u00e1y bi\u1ebfn \u00e1p l\u00e0m t\u0103ng \u0111i\u1ec7n \u00e1p l\u00ean bao nhi\u00eau th\u00ec gi\u1ea3m c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n b\u1ea5y nhi\u00eau l\u1ea7n.<\/p>\n

C\u00e2u 2 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0N\u00eau c\u00e1c c\u00e1ch ch\u1ee7 y\u1ebfu l\u00e0m gi\u1ea3m \u0111i\u1ec7n n\u0103ng hao ph\u00ed:<\/span><\/p>\n

a) Trong m\u00e1y bi\u1ebfn \u00e1p.<\/p>\n

b) Trong truy\u1ec1n t\u1ea3i \u0111i\u1ec7n \u0111i xa.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

a) Trong m\u00e1y bi\u1ebfn \u00e1p. M\u00e1y bi\u1ebfn \u00e1p g\u1ed3m hai cu\u1ed9n d\u00e2y c\u00f3 s\u1ed1 v\u00f2ng kh\u00e1c nhau qu\u1ea5n tr\u00ean m\u1ed9t l\u00f5i s\u1eaft k\u00edn. L\u00f5i th\u01b0\u1eddng l\u00e0m b\u1eb1ng c\u00e1c l\u00e1 s\u1eaft ho\u1eb7c th\u00e9p pha silic, gh\u00e9p c\u00e1ch \u0111i\u1ec7n v\u1edbi nhau \u0111\u1ec3 gi\u1ea3m hao ph\u00ed \u0111i\u1ec7n n\u0103ng do d\u00f2ng Phu-c\u00f4. C\u00e1c cu\u1ed9n d\u00e2y th\u01b0\u1eddng l\u00e0m b\u1eb1ng \u0111\u1ed3ng, \u0111\u1eb7t c\u00e1ch \u0111i\u1ec7n v\u1edbi nhau v\u00e0 \u0111\u01b0\u1ee3c c\u00e1ch \u0111i\u1ec7n v\u1edbi l\u00f5i, d\u00e2y \u0111\u1ed3ng c\u00f3 \u0111i\u1ec7n tr\u1edf nh\u1ecf \u0111\u1ec3 hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean d\u00e2y b\u00e9.<\/p>\n

b) Trong truy\u1ec1n t\u1ea3i \u0111i\u1ec7n \u0111i xa.<\/p>\n

+ T\u0103ng \u0111i\u1ec7n \u00e1p truy\u1ec1n t\u1ea3i v\u00e0 gi\u1ea3m \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn.<\/p>\n

B\u00c0I T\u1eacP<\/strong><\/p>\n

B\u00e0i 1 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1ed9t m\u00e1y bi\u1ebfn \u00e1p c\u00f3 cu\u1ed9n th\u1ee9 c\u1ea5p m\u1eafc v\u1edbi m\u1ed9t \u0111i\u1ec7n tr\u1edf thu\u1ea7n, cu\u1ed9n s\u01a1 c\u1ea5p m\u1eafc v\u1edbi ngu\u1ed3n \u0111i\u1ec7n xoay chi\u1ec1u. \u0111i\u1ec7n tr\u1edf c\u1ee7a c\u00e1c cu\u1ed9n d\u00e2y v\u00e0 hao ph\u00ed \u0111i\u1ec7n n\u0103ng \u1edf m\u00e1y kh\u00f4ng \u0111\u00e1ng k\u1ec3. N\u1ebfu t\u0103ng tr\u1ecb s\u1ed1 c\u1ee7a \u0111i\u1ec7n tr\u1edf m\u1eafc v\u1edbi cu\u1ed9n th\u1ee9 c\u1ea5p gi\u1ea3m hai l\u1ea7n th\u00ec.<\/span><\/p>\n

A. C\u01b0\u1eddng \u0111\u1ed9 hi\u1ec7u d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n ch\u1ea1y trong cu\u1ed9n th\u1ee9 c\u1ea5p gi\u1ea3m hai l\u1ea7n, trong cu\u1ed9n s\u01a1 c\u1ea5p kh\u00f4ng \u0111\u1ed5i.<\/p>\n

B. \u0110i\u1ec7n \u00e1p \u1edf hai \u0111\u1ea7u cu\u1ed9n s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p \u0111\u1ec1u t\u0103ng hai l\u1ea7n.<\/p>\n

C. Su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng c\u1ea3m \u1ee9ng trong cu\u1ed9n th\u1ee9 c\u1ea5p t\u0103ng hai l\u1ea7n, trong cu\u1ed9n s\u01a1 c\u1ea5p kh\u00f4ng \u0111\u1ed5i.<\/p>\n

D. C\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 \u0111i\u1ec7n \u1edf m\u1ea1ch s\u01a1 c\u1ea5p v\u00e0 th\u1ee9 c\u1ea5p \u0111\u1ec1u gi\u1ea3m hai l\u1ea7n.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn D<\/p>\n

N\u1ebfu t\u0103ng \u0111i\u1ec7n tr\u1edf l\u00ean hai l\u1ea7n th\u00ec c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 \u1edf m\u1ea1ch th\u1ee9 c\u1ea5p gi\u1ea3m hai l\u1ea7n.<\/p>\n

$\"\"$ <\/p>\n

V\u00ec b\u1ea3o to\u00e0n n\u0103ng l\u01b0\u1ee3ng n\u00ean P_{1<\/sub>\u00a0= P_{2<\/sub>\u00a0n\u00ean P_{1<\/sub>\u00a0c\u0169ng gi\u1ea3m hai l\u1ea7n.<\/p>\n}}}

B\u00e0i 2 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Ch\u1ecdn ph\u00e1t bi\u1ec3u sai.<\/span><\/p>\n

Trong qu\u00e1 tr\u00ecnh t\u1ea3i \u0111i\u1ec7n n\u0103ng \u0111i xa, c\u00f4ng su\u1ea5t hao ph\u00ed.<\/p>\n

A. T\u1ec9 l\u1ec7 v\u1edbi th\u1eddi gian truy\u1ec1n \u0111i\u1ec7n.<\/p>\n

B. T\u1ec9 l\u1ec7 v\u1edbi chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n.<\/p>\n

C. T\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi b\u00ecnh ph\u01b0\u01a1ng \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u d\u00e2y \u1edf tr\u1ea1m ph\u00e1t \u0111i\u1ec7n.<\/p>\n

D. T\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng c\u00f4ng su\u1ea5t truy\u1ec1n \u0111i.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn A. khi \u1ed5n \u0111\u1ecbnh c\u00f4ng su\u1ea5t hao ph\u00ed kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o th\u1eddi gian t, ch\u1ec9 c\u00f3 n\u0103ng l\u01b0\u1ee3ng hao ph\u00ed m\u1edbi t\u1ef7 l\u1ec7 v\u1edbi t.<\/p>\n

B\u00e0i 3 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Cu\u1ed9n s\u01a1 c\u1ea5p c\u1ee7a m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi m\u1ea1ng \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 \u0111i\u1ec7n \u00e1p 380V. cu\u1ed9n th\u1ee9 c\u1ea5p c\u00f3 d\u00f2ng \u0111i\u1ec7n c\u01b0\u1eddng \u0111\u1ed9 1,5 A ch\u1ea1y qua v\u00e0 c\u00f3 \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u d\u00e2y l\u00e0 12 V. bi\u1ebft s\u1ed1 v\u00f2ng d\u00e2y c\u1ee7a cu\u1ed9n th\u1ee9 c\u1ea5p l\u00e0 30. T\u00ednh s\u1ed1 v\u00f2ng d\u00e2y c\u1ee7a cu\u1ed9n s\u01a1 c\u1ea5p v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3. B\u1ecf qua hao ph\u00ed \u0111i\u1ec7n n\u0103ng trong m\u00e1y.<\/span><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Theo gi\u1ea3 thi\u1ebft: 380V; I_{2<\/sub>\u00a0= 1,5A; U_{2<\/sub>\u00a0= 12V; n_{2<\/sub>\u00a0= 30<\/p>\n}}}

\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:<\/p>\n

$\"\"$ <\/p>\n

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

$\"\"$ <\/p>\n

B\u00e0i 4 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0\u0110i\u1ec7n n\u0103ng \u1edf m\u1ed9t tr\u1ea1m ph\u00e1t \u0111i\u1ec7n \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i d\u01b0\u1edbi \u0111i\u1ec7n \u00e1p 2kV v\u00e0 c\u00f4ng su\u1ea5t truy\u1ec1n \u0111i 200 kW. Hi\u1ec7u s\u1ed1 ch\u1ec9 c\u1ee7a c\u00e1c c\u00f4ng t\u01a1 \u0111i\u1ec7n \u1edf tr\u1ea1m ph\u00e1t v\u00e0 \u1edf n\u01a1i thu sau m\u1ed7i ng\u00e0y \u0111\u00eam l\u1ec7ch nhau th\u00eam 480 kWh.<\/span><\/p>\n

a) T\u00ednh c\u00f4ng su\u1ea5t \u0111i\u1ec7n hao ph\u00ed tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n.<\/p>\n

b) C\u1ea7n t\u0103ng \u0111i\u1ec7n \u00e1p \u1edf tr\u1ea1m ph\u00e1t \u0111\u1ebfn gi\u00e1 tr\u1ecb n\u00e0o \u0111\u1ec3 \u0111i\u1ec7n n\u0103ng hao ph\u00ed tr\u00ean \u0111\u01b0\u1eddng d\u00e2y ch\u1ec9 b\u1eb1ng 2,5% \u0111i\u1ec7n n\u0103ng truy\u1ec1n \u0111i? Coi c\u00f4ng su\u1ea5t truy\u1ec1n \u0111i \u1edf tr\u1ea1m ph\u00e1t \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

a) Theo gi\u1ea3 thi\u1ebft W = 480 kWh, t = 24h n\u00ean \u2206P = W\/t = 20kW<\/p>\n

\u2206P’ = 5\/100.P = 5kW.<\/p>\n

G\u1ecdi R l\u00e0 \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1eddng d\u00e2y th\u00ec \u2206P = RI^{2<\/sup>; \u2206P’ = RI’^{2<\/sup>. T\u1eeb \u0111\u00f3 suy ra:<\/p>\n}}

$\"\"$ <\/p>\n

V\u00ec c\u00f4ng su\u1ea5t truy\u1ec1n \u0111i \u1edf tr\u1ea1m ph\u00e1t \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i n\u00ean U’I’ = UI \u21d2 U’ = 2U = 4kV.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U H\u1eceI C\u00e2u 1 (trang 172 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a s\u1ef1 bi\u1ebfn \u0111\u1ed5i \u0111i\u1ec7n \u00e1p v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua m\u00e1y bi\u1ebfn \u00e1p. L\u1eddi gi\u1ea3i: \u0110i\u1ec7n \u00e1p t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi c\u00e1c v\u00f2ng d\u00e2y: N\u1ebfu N2\u00a0> N1\u00a0th\u00ec U2\u00a0> U1, ta g\u1ecdi m\u00e1y bi\u1ebfn \u00e1p l\u00e0 m\u00e1y t\u0103ng \u00e1p. N\u1ebfu […]<\/p>\n","protected":false},"author":3,"featured_media":25092,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1304],"tags":[1434,1433],"yoast_head":"\nCh\u01b0\u01a1ng 5 - B\u00e0i 32: M\u00e1y bi\u1ebfn \u00e1p. 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