DongCoDien (29).pdf

# DongCoDien (29).pdf - Trường ĐHBK Hà Nội Đồ án...

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Tr ườ ng Đ HBK Hà N i -- ± -- Đồ án t t nghi p SV L ư u V ă n Th ng - 23 - L p K9C- T Đ H T c độ bi ế n thiên đ i n áp ) / ( 200 m v dt du = T c độ bi ế n thiên dòng đ i n ) ( 180 μς A dt di = Th i gian chuy n m ch T cm =50 μ s Nhi t độ làm vi c c c đạ i cho phép T max =125 0 C 4-3: Tính ch n thi ế t b b o v van: Dùng áptômát để tác độ ng nhanh đ óng c t m ch đọ ng l c t b o v .Quá t i và ng ă n m ch tiristor. + ch n áptômát (AT) có I đ m =(1,1-1,3)I d Sao cho dòng b o v c a áptômát không v ượ t quá dòng ng ă n M ch c a th c p . Ch n I đ m = 1,1I 1d =1,1.3,74 =4,11(A) U đ m = 220(v). Dùng c u chì ( cc) tác độ ng nhanh để b o v ng n m ch , nhóm 1cc b o v ng n m ch bên ngoài đượ c ch n theo. Giá tr hi u d ng c a dòng đ i n th c p c a máy bi
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• Stephanie Moore

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