{"id":4384,"date":"2024-01-16T11:01:53","date_gmt":"2024-01-16T04:01:53","guid":{"rendered":"https:\/\/powermore.vn\/?p=4384"},"modified":"2024-01-16T14:50:13","modified_gmt":"2024-01-16T07:50:13","slug":"gioi-thieu-dien-tro-noi-dat","status":"publish","type":"post","link":"https:\/\/powermore.vn\/vi\/gioi-thieu-dien-tro-noi-dat\/","title":{"rendered":"\u0110i\u1ec7n Tr\u1edf N\u1ed1i \u0110\u1ea5t"},"content":{"rendered":"

GI\u1edaI THI\u1ec6U V\u1ec0 H\u1ec6 TH\u1ed0NG \u0110I\u1ec6N KH\u00d4NG N\u1ed0I \u0110\u1ea4T (UNGROUNDED SYSTEM)<\/h4>\n\n\n\n
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Trong m\u1ed9t h\u1ec7 th\u1ed1ng kh\u00f4ng n\u1ed1i \u0111\u1ea5t, kh\u00f4ng c\u00f3 k\u1ebft n\u1ed1i gi\u1eefa d\u00e2y d\u1eabn h\u1ec7 th\u1ed1ng v\u00e0 m\u1eb7t \u0111\u1ea5t. Tuy nhi\u00ean, lu\u00f4n t\u1ed3n t\u1ea1i m\u1ed9t \u0111i\u1ec7n dung gi\u1eefa m\u1ed9t d\u00e2y d\u1eabn v\u00e0 d\u00e2y d\u1eabn kh\u00e1c, v\u00e0 c\u1ea3 gi\u1eefa d\u00e2y d\u1eabn v\u00e0 \u0111\u1ea5t. Do \u0111\u00f3, c\u00e1i g\u1ecdi l\u00e0 h\u1ec7 th\u1ed1ng kh\u00f4ng n\u1ed1i \u0111\u1ea5t th\u1ef1c ra l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng n\u1ed1i \u0111\u1ea5t \u0111i\u1ec7n dung, nh\u1edd v\u00e0o \u0111i\u1ec7n dung ph\u00e2n b\u1ed5 gi\u1eefa c\u00e1c d\u00e2y d\u1eabn v\u00e0 \u0111\u1ea5t. Ng\u01b0\u1eddi ta th\u01b0\u1eddng b\u1ecf qua \u0111i\u1ec7n dung gi\u1eefa c\u00e1c pha v\u00ec n\u00f3 \u00edt \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1eb7c t\u00ednh n\u1ed1i \u0111\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n\n\n\n

Trong m\u1ed9t h\u1ec7 th\u1ed1ng v\u1eadn h\u00e0nh b\u00ecnh th\u01b0\u1eddng, \u0111i\u1ec7n dung (g\u1ecdi l\u00e0 Xco) ph\u00e2n b\u1ed5 tr\u00ean d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c cho l\u00e0 c\u00e2n b\u1eb1ng. D\u00f2ng s\u1ea1c \u0111i\u1ec7n dung (g\u1ecdi l\u00e0 Ico) tr\u00ean c\u00e1c pha l\u00e0 b\u1eb1ng nhau v\u00e0 l\u1ec7ch pha 120 \u0111\u1ed9 so v\u1edbi nhau. <\/p>\n\n\n\n

Tuy nhi\u00ean, n\u1ebfu m\u1ed9t trong c\u00e1c pha g\u1eb7p s\u1ef1 c\u1ed1 ch\u1ea1m \u0111\u1ea5t, \u1edf \u0111\u00e2y ch\u00fang ta gi\u1ea3 \u0111\u1ecbnh l\u00e0 pha C c\u00f3 s\u1ef1 c\u1ed1, th\u00ec d\u00f2ng Ico tr\u00ean pha C b\u1eb1ng 0A v\u00ec \u0111i\u1ec7n \u00e1p gi\u1eefa pha C v\u00e0 \u0111\u1ea5t bay gi\u1edd b\u1eb1ng 0V. \u0110i\u1ec7n \u00e1p tr\u00ean 2 pha c\u00f2n l\u1ea1i d\u00e2ng l\u00ean, v\u00e0 d\u00f2ng Ico tr\u00ean 2 pha c\u00f2n l\u1ea1i c\u0169ng d\u00e2ng l\u00ean 1.73 l\u1ea7n (c\u0103n b\u1eadc hai c\u1ee7a 3). <\/p>\n<\/div>\n\n\n\n

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H\u1ec7 th\u1ed1ng kh\u00f4ng n\u1ed1i \u0111\u1ea5t<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Trong h\u1ec7 th\u1ed1ng kh\u00f4ng n\u1ed1i \u0111\u1ea5t, c\u00e1c qu\u00e1 \u0111i\u1ec7n \u00e1p x\u1ea3y ra do s\u1ef1 c\u1ed1 ch\u1ea1m \u0111\u1ea5t c\u00f3 th\u1ec3 l\u00ean t\u1edbi v\u00e0i tr\u0103m % so v\u1edbi \u0111i\u1ec7n \u00e1p b\u00ecnh th\u01b0\u1eddng, ph\u00e1 h\u1ee7y c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c c\u00f9ng h\u1ec7 th\u1ed1ng. C\u00e1c qu\u00e1 \u0111i\u1ec7n \u00e1p n\u00e0y g\u00e2y ra b\u1edfi c\u1ed9ng h\u01b0\u1edfng gi\u1eefa \u0111i\u1ec7n dung Xco v\u00e0 th\u00e0nh ph\u1ea7n \u0111i\u1ec7n c\u1ea3m L c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n\n\n\n

C\u00e1c qu\u00e1 \u0111i\u1ec7n \u00e1p n\u00eau tr\u00ean c\u00f3 th\u1ec3 \u0111\u00e1nh th\u1ee7ng c\u00e1ch \u0111i\u1ec7n c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb t\u1ea1i c\u00e1c v\u1ecb tr\u00ed kh\u00e1c nhau trong h\u1ec7 th\u1ed1ng. Qu\u00e1 \u0111i\u1ec7n \u00e1p do ch\u1ea1m \u0111\u1ea5t trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n kh\u00f4ng n\u1ed1i \u0111\u1ea5t l\u00e0 l\u00fd do ch\u00ednh khi\u1ebfn cho c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng n\u1ed1i \u0111\u1ea5t kh\u00f4ng c\u00f2n \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb n\u1eefa. Ng\u00e0y nay, ng\u01b0\u1eddi ta th\u01b0\u1eddng x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng \u0111i\u1ec7n n\u1ed1i \u0111\u1ea5t b\u1eb1ng nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau nh\u1eb1m \u0111\u1ea3m b\u1ea3o an to\u00e0n.<\/p>\n\n\n\n

Ngo\u00e0i ra, khi x\u1ea3y ra s\u1ef1 c\u1ed1 trong h\u1ec7 th\u1ed1ng kh\u00f4ng n\u1ed1i \u0111\u1ea5t, r\u1ea5t kh\u00f3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed s\u1ef1 c\u1ed1 v\u00e0 m\u1ea5t r\u1ea5t nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 t\u00ecm v\u00e0 x\u1eed l\u00fd s\u1ef1 c\u1ed1. V\u00ec v\u1eady, kh\u00f3 \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t li\u00ean t\u1ee5c khi s\u1ef1 c\u1ed1 x\u1ea3y ra.<\/p>\n\n\n\n

H\u1ec6 TH\u1ed0NG \u0110I\u1ec6N N\u1ed0I \u0110\u1ea4T B\u1eb0NG \u0110I\u1ec6N TR\u1ede (RESISTANCE-GROUNDED SYSTEM)<\/h4>\n\n\n\n
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Trong h\u1ec7 th\u1ed1ng n\u1ed1i \u0111\u1ea5t b\u1eb1ng \u0111i\u1ec7n tr\u1edf, ph\u00eda trung t\u00ednh c\u1ee7a M\u00e1y Bi\u1ebfn \u00c1p ho\u1eb7c M\u00e1y Ph\u00e1t \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t b\u1edfi m\u1ed9t \u0111i\u1ec7n tr\u1edf. Do \u0111i\u1ec7n tr\u1edf c\u00f3 gi\u00e1 tr\u1ecb tr\u1edf kh\u00e1ng l\u1edbn h\u01a1n nhi\u1ec1u tr\u1edf kh\u00e1ng h\u1ec7 th\u1ed1ng, d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ch\u1ea1m \u0111\u1ea5t s\u1ebd gi\u1ea3m t\u01b0\u01a1ng \u1ee9ng. <\/p>\n\n\n\n

Ng\u01b0\u1eddi ta h\u1ea1n ch\u1ebf d\u00f2ng ng\u1eafn m\u1ea1ch b\u1eb1ng \u0111i\u1ec7n tr\u1edf trung t\u00ednh b\u1edfi c\u00e1c l\u00fd do sau:<\/p>\n\n\n\n