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BOÄ COÂNG THÖÔNG
TRÖÔØNG CÑKT CAO
THAÉNG
KHOA ÑCN - ÑL
ÑEÀ KIEÅM TRA HOÏC KYØ
Moân: MAÙY ÑIEÄN
Lôùp: CĐN ÑCN 12
Thôøi gian laøm baøi: 75 phuùt
Ngaøy thi:ĐỀ
(Khoâng söû duïng taøi lieäu)
Lớp :……………………………….
Họ Tên :...........................................
Caâu 1 : (2đ)
Trình baøy ñònh nghóa vaø coâng duïng cuûa maùy bieán aùp cuûa
maùy bieán aùp ?
Caâu 2 : (1 đ)
Trình bày cách đảo chiều động cơ KĐB một pha ?
Caâu 3 : (3 đ)
Cho MBA 3 pha đấu Y/Y-12 có các thông số như sau :
Sđm = 180 KVA, U1đm = 22 KV , U2đm = 0.4 KV ; P0 = 470 W ; Pn = 2400 W, I0%
= 8% ; Un% = 4.5 %. Tính :
a. Tính dòng điện I1đm , I2đm, dòng điện không tải I0.
b. Tính các thông số ngắn mạch Rn , Xn, Zn.
Caâu 4 : (4 đ)
Cho ñoäng cô ñieän khoâng ñoàng boä ba pha Rotor loàng soùc,
Pñm=30 Hp, f = 50Hz, U:380/660V, Cos dmϕ =0,8, 9,0=dmη , nđm= 1450
vòng/phut, 2p=4,
5mm
đm
I
I
=
;
5,1=
đm
mm
M
M
; UdL= 380(V) (1Hp=746w)
a. Động cơ đấu kiểu gì? (Vẽ hình sơ đồ đấu thực tế)
b. Doøng ñieän ñònh möùc cuûa ñoäng cô ?
c. Moâmen ñònh möùc cuûa ñoäng cô ?
d. Hệ số trượt định mức?
e. Tính MC toái ña maø ñoäng cô coù theå môû maùy ñöôïc khi aùp
duïng phöông phaùp môû maùy ∆/Y ?
………, Ngày ………. Tháng ……. Năm ….
TRƯỞNG BỘ MÔN GIÁO VIÊN RA ĐỀ
Lê Thành Tâm

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Md i 2

  • 1. BOÄ COÂNG THÖÔNG TRÖÔØNG CÑKT CAO THAÉNG KHOA ÑCN - ÑL ÑEÀ KIEÅM TRA HOÏC KYØ Moân: MAÙY ÑIEÄN Lôùp: CĐN ÑCN 12 Thôøi gian laøm baøi: 75 phuùt Ngaøy thi:ĐỀ (Khoâng söû duïng taøi lieäu) Lớp :………………………………. Họ Tên :........................................... Caâu 1 : (2đ) Trình baøy ñònh nghóa vaø coâng duïng cuûa maùy bieán aùp cuûa maùy bieán aùp ? Caâu 2 : (1 đ) Trình bày cách đảo chiều động cơ KĐB một pha ? Caâu 3 : (3 đ) Cho MBA 3 pha đấu Y/Y-12 có các thông số như sau : Sđm = 180 KVA, U1đm = 22 KV , U2đm = 0.4 KV ; P0 = 470 W ; Pn = 2400 W, I0% = 8% ; Un% = 4.5 %. Tính : a. Tính dòng điện I1đm , I2đm, dòng điện không tải I0. b. Tính các thông số ngắn mạch Rn , Xn, Zn. Caâu 4 : (4 đ) Cho ñoäng cô ñieän khoâng ñoàng boä ba pha Rotor loàng soùc, Pñm=30 Hp, f = 50Hz, U:380/660V, Cos dmϕ =0,8, 9,0=dmη , nđm= 1450 vòng/phut, 2p=4, 5mm đm I I = ; 5,1= đm mm M M ; UdL= 380(V) (1Hp=746w) a. Động cơ đấu kiểu gì? (Vẽ hình sơ đồ đấu thực tế) b. Doøng ñieän ñònh möùc cuûa ñoäng cô ? c. Moâmen ñònh möùc cuûa ñoäng cô ? d. Hệ số trượt định mức? e. Tính MC toái ña maø ñoäng cô coù theå môû maùy ñöôïc khi aùp duïng phöông phaùp môû maùy ∆/Y ? ………, Ngày ………. Tháng ……. Năm ….
  • 2. TRƯỞNG BỘ MÔN GIÁO VIÊN RA ĐỀ Lê Thành Tâm