1. D6ng co kh6ng ddng bQ r6to ldng s6c 3 pha c6 c6ng sudt Olnfr mtlc Pdm = 28 kW, di6n 6p
dinh m0c Udm
=
380 V, tdns6
50 Hz, dduY, 6
crlc, hOsd
c6ng sudt dinh mlrc cosgdm = 0,88, tdc dO dinh muc ndm = 980 v/ph. (Tdn hao ddng + tdn hao sdt statolld2,2kw,
tdn haocd
(do ma sdt, quat gi6...)la
1,1 kW, khi d6ng cd lam vi6c 6 tai dinhmfc.
Tinh, luc ta-i dinhmfc:
a/ hd s6 truqt sdm (0,5 d)
b/ tdn hao ddng r6to pCu2dm (0,5 d)
c/ hi6u sudt qdm (0,5 d)
d/ ddng di6n stato
lldm
(0,5 d)e/ tdn sd dong di6n r6to f2 (1d)
2.
Miry phdt di6n ddng bd cung cdp di6n cho hd ti6uthu
m6t c6ngsudt
S = 2500+j3000 kVA, 6 di6n 6p 6,3 kV.a/ Tinh tdng tdn hao trdn drJdng dAy vA trong m6y ph6t, biet rdng di6n tr6 c0a duong dAy /
phaldrrd=0,15C),di6ntrddAyqudnphdnfng/phac0amdyphdtldrrl=0,045
O(1d).b/ Ndu ddt th6m mQt dQng cd di6n ddng bO ldm vi6c trong chd dd qud kich tit, phdt ra cOng b/ Ndu ddt th6m mQt dQng cd di6n ddng bO ldm vi6c trong chd dd qud kich tit, phdt ra cOngsudt
pnAn khdng, vdi S = 30- j3000 kVA, thi tdng tdn hao tr6n s6 ld bao nhi6u ? (2d)3. Mdy bidn
6p
1 pha c6 c6c sd ti,Ou sau:c6ng
sudt dinh muc Sdm=
100 kVA, tdn sd 60Hz, di6n dp dinh mrlc U1/U2 =7200/480 V, co cdc th6ng sd tfnn
bing
ohms: R,cao dp =3,06
X,cao 6p =6,05
XM, cao eip = 17 809R,h4
dp
=0,014
X,ha Ap =0,027
RM, cao 6p = 71 400Mdy biSn dp cung cdp diQn cho tAi ti6u
thtl
dong dinh mr.tc, d di6n 6p dinh mtrc 480 V, tai c6 cosrp =0,75 tr5. VE so dd mach tudng dudng c0a mdy biSn dp vd tinh :'al di6n trd vA di6n khdng tuong dudng c0a mdy bidn dp nhin trl phia cao 6p (1
d) b/ tdng trd nhin vdo mdy bidn dp trr phia cao 6p (k€i cA tdng trd c0a tAi) (1 d)
c/ di6n dp phia cao dp c0a mdy bidn dp khi do (1 d)
d/tdng
tr6
nhinvdo mdy bidn dp ttl phia cao dp khi kh6ng tai (1 d)4. D6ng cd diQn 1 chidu kfch trt song song, c6ng suSt dinh
mfc
Pdm = 95kw,
di6n 6p dinhmUc Udm'- 220V,
dong ti6u thU dinh mrlc ldrn=
470 A, ddng kichtrj
dinhmfc
iktdm = 4,25 A, ndm = 500 v/ph. Di6n trd dAy qudn phdn ttng rU = 0,0125 O. Tinh :a/ hi6u sudt 10,s o;
b/ tdn hao ddng trong m6y, tdn hao khi khdng tAi vd dong kh6ng tai (0,5 d)
c/
moment cr3a d6ng cd (1 d)d/ di6n
