đề thi cao học thiết bị mạng nhà máy điện

r
i
4'-
DAr
Hec
eu6c
crA
Tp HO cui MrNH
TRrIor.{c qAr
Hec
nAcn KHoA
HQr DONG
rUrgN
srNH
______000_
'
DE
rnl
MON
sAU
DAr Hec
NAvr
2oo7
Tuy6n
sinh:
tr
CAO
HeC
fl NCHTBN
CUU
SINH

Chuy0+
ngdnh:
fnidt
bi
di6n
nhd
m6y diQn.
MOn thi:
Thdi
gian
ldm
bdi : 180
phrit.
Thisinh
kh6ng
srl dr=rng
tai
li6u.
Dd thi
sd:
Lr.lr,r
V
: Thi
sinh ldm
cdc
phdn
A, B,
c, D
tr6n
c6c

to
gidy
thi khdc
nhau
DE
THI
SO: 02
Ciu l:
Cdu I M6y
bi€n 6p
3
pha
c6 c6ng
suAt
S
:
5600 KVA;
t1i s6
U,ruz:35000/66000
V; mriy
c6
c6c th6ng
so kirong
tti:
IsoA: 4,5,
P()
:
18,6
KW vi c6
c6c th6ng

s6
ngin
mach,
Un;/o
:'7,5,
Pn: 57
KW; Scy aO
OAu ddy
c6 dang
Y/A-
11. Hay
xdc dinh:
ll
Cdc tham
s6 kh6ng
tAi: 16,
zo, xo
2/
Cie tham
s6 ngin
mach'. rn)
zn,
xn
3/ Di6n itpUz,6
tai
dinh mric.
cosrp
:
0,8, ddng diQn
chQm

pha
4l
DiQn 6p9r,
6 75%
tai
dinh
mftc, cos<p
:
0,8,
dong
diQn
snrn pha
5/ HiQu
su6t
q
% 6 tai dinh
mric,
cosq
:0,8,
ddng
diQn
ch6m pha
Ciu2:
"
Su,
'Sf
l,\
s0 oo
m?ng dlen
:

-
Duong
day
ab :
IJd,
:
I 10
kV, dai
50
km, ddy dAn
c6
diQn
tro rs:
0,12
ohm/km,
cAm
kh,ing
xs:0,42
ohm/km,
dung
ddn
bo:2,8.10-6
ohm.lon
-
M6y bi6n
6p
T I
Sdn,':40000
kVA
,

ll0l22 kV,
di6n
trd
RB
:2,2
ohm
,
cim
khdng
Xs:
30,7 ohm
(
Rs
,
Xe
qui
vA phia
cao 6p
),
APo
:
150 kW,
I0olo
:2o/o
.
-
Duons ddy
cdef
I IJd*
:

22
kV,
ctrng
ti(!t diQn d6y,
diQn trd
16
:
0,13
ohm/km, cdm
kh6ng xs:0,36
ohm&m
.
Eo4n
cd
ddi 6 km, do4n
de dai
4
km, doan
ef
ddi 2 km
.
-
Phu tdi LS"
=
25 +
jll
MVA
Su"
=
4

+
j2,67
MVA
(
tdng c6ng su6t
tdi
phdn
bO ACu
tr€n doan
de)
S
r
=3+
j2
MVA
- Di0n6pr
lJr:21
kVoPhstiif.
Hdy
tinh:
a)
EiQn
6p U" o
thanh
cdi
c
.
Ui
COng
26t-S"1

ddu
dulng
diy
phdn
ph6i cAef
vdr
cdng
su6t S,1
phia thanh
cii
22
kY
cua
m6y
bi0n
dp T
.
c) EiQn
6p Uu
t4i thanh
c6i
b
.
d) EiQn
6p.Uo
tai
thanh
c6i
A
e)

HiQu
suAt
tai diQn
cua
duong
ddy
110
kV,
he
s6
c6ng sudt d A
'
Cflu
3:
T1
T1
AY
__)_.
Cho
hQ thdng
diQn nhu
hinh
vE:
G-
M6y
ptrat
Aien 3
pha_ c6
c6ng
su6t

dinh
mric
100
MVA;13,8
kV,
khSng
tr&
si6u
ty]
dQ:
x,':0,15
don
vi tuong
AOi
(A"tA), kh6ng
trd
thri
t.u
nghich
bing
0,17 dvtd,
kh6ng
tro
thri
tr;
l:h6ng
bing
0,05
dvtd .
M- DlOng

ccr
3
pha
co
c6ng
su6t
100
MVA;13,8
kV,khang
tro.si€u
qu6
dQ
x":0,2
dvtd,kh6ng
tro
thir
lU ngtritir
bing
Olt
dvtd;
khdng
tro
thri
tg khdng
bdng
0,10
dvtd;
kh6ng
trd
cu6n

kh6ng
noi
aat
bing
0,05
d-vtd
theo
co b6n
la dinh
muc
cira
d6ng
ccr.
Tl,T2-
2 m6y
UiOn
ap
r"Ai
-ay
c6
c6ng su6t
dinh
mric
100MVA,13,8/138
kV,t6
d6u
ddy
tam
giic-sao
nOi

a6t trucii6p;
Kh6ng
tro blng
0,01
dvtd.
L- Ooorrg
d6y
c6
kh6ng
tre
thf-tg
thuin bing
khang
trd
thti
tg nghlch
bdng
20 ohm,
khiing
tro
thri
tq khdng
ld 60
ohm.
86
qua
inh
hu&ng
cua
diQn

tro.
a/Th;nh
l{p so
il6-thay
the
tht
tp
thuin.
nghich,
khdng
cira
hQ
th6ng
trOn,
tinh
theo
ccr
ban
100
MVA
b/Tinh
dong
di6n
ng6n
mach
3
pha vir cham
d6t
t
ptra t4rc

ti€p
v6i d6t t4i
nirt
4.Gia
thitlt
trucvc
luc
qr
"O
xay
ra,diQn
6p tai
m6y
ph6t la 1,05
dvtd.,b6
qua
ddng
diQn
phg
t6i.
Ciu
4:
ifiav
ph6t d6ng
bQ 3
pha
50Hz-
mey
A
vir m6y

B-
gi.6ng
hQt nhau,
q51mar
c6 c6.ng
sudt
dinh
muc
300
kVA:
+iO
V, <lugc
n6i rong
rotrg
vd
cung
c6p
diQn
cho
tii. D09g
co so
cdp
cung
;4ffi;
"tA,
;"
6c
cho
m6i
mey

ph6t lr€n
* aar
tinh
iai
(quan
hQ cria
t5".9Q
n
Jhe.o
c6nq
;ht
phe, wA-
dugc
xem
h
dudng
thing)
vdi
$0
d6c
kh6c
nhau.
Khi
ddng
kich
tir
cho
m.6i
may
ia

nhu
nhau,
m6y
A
cung.cAp
ZOO
e
O
h0 sd
cdng
su6t 0,9
tr6, trong
khi
m6y
B
cung
cdp
180
A o
hQ
s6
c6ng sudt
0,75
tr€-
a/ C6ng
su6t
tec
d\rng
vd c6ng
suAt

phin kh6ng
cung
cAp
cho
tei
boi
mdi m6y
ph6t?
b/
H9 sl6
c6ng
suAt
cua
tai?
I
-::
\1^A.
t)
l)
i
:_
ri
-7
3
ci
Cdn
diOu
chinh
ddng
kich

tu cria
m5i^m6y
theo
chidu
hu6ng
ndo
(ting
hay
gidm),
sao
cho
hai
m6y ldm
viQc
o cung
h0
s6 c6ng
suAt?
B.
DQng co khong
d6ng
bQ
3
pha,
2
u(c,100
Hp
(l
Hp
:

746
w),
50
Hz, 460v,
stato
ntii
a,
c6
ti s6
(kVA
khi
md
mey/HP):
5,6.
a/
Ddng m& mrly
lcm
nhat
md
b0
khoi
dQng
tr.uc ti6p (d€
m<r
m6y
d6ng
ccr) phai
ldm
vi6c
vdi?

b/ Khi b6
khcri
dQng.dusc
trriet
tc
d6
mo
mey
dQng co
theo
prr""n!
pnai,
aai
11ai
nla,
"i-r,
ddng
rnd
m6y
l6n
ntr{1ma
UQ
khoi
dgng
phai
hm vielc
Uri
mo
m6y
AO"i

""
f
c/
Khi
dung
b6
khcri
dQng
ki6u
t.u
bitin
rip
c6.
ti s6.
bi6n
rip
I
,25:l
O6
mO
iray
d6ng
co,
tinh
dong
mo
mdy
lcrn
nhdt
ch4y

tr6n
ducrng
d6y
c6p
di6n
cho
dQng
co?
DAI
HQC
QUOC
GIA
TP Ho cHi
MINH
TRrroNc
DAr Hoc eAcH KHoA
HOt DONG TTryEN SINH
000-
DE THt
MON
SAU EAr HQC
NANA
2oo8
Tuy6n
sinh: tr
CAO
HeC
n
NC}IIEN
CUU

SINH
Chuy6r+
ngdnh: fniSt
bi di6n nhd m6y di6n.
MOn thi:
Thdi
gian
lirm bAi :180
phrit.
ThiSinh kh6ng
sfidr,rngtai
ti6u.
Dd
thi
sd:
Luu
y
: Thf
sinh
lAm
c6c
phdn
A, B, C, D tr6n
cdc to
gidy
thi khdc
nhau
Ciu
1:
M6y biOn

6p
3
pha
c6 c6ng
sudt
S:3000 KVA;
ti
sd
Urru2:220001400
V;
mdy c6 ciic
thQng
s5
khQag.Jgi:
Un
.
4,8o
,
thanh
phAn
tiic
dung cta diQn
6p ngin
m4ch
l,Bo
,hQ
s6 c6ng
su'5t 0,9
tr6
pha,

So
d6
d6u ddy c6.d4ng
Y/A- 5. Hdy xdc
dinh:
1/
56
vong dAy so cAp vd
thri cAp,
uv: 6,8
V/vdng.
2lDdngdinh
mric scr cAp vi
thir cAp.
3/ HiQu su6t, bitit t6n th6t
sit 0,026
56,,,
giA
su
Rl:
R'2.
4lT\nth6t dinh
mirc
vd
hQ
s6 c6ng su6t
khi
ldm thi nghiOm
ngin mach"
5/Vd

so d6
vectcv
d6 th6y
m6i
quan
h0
v0
g6c
pha
gita
di6n
6p phia
scr
cAp vd thri
c6p
img
v6i so dd
Y/A- 5.
o€ rnl
sd: ol
Cho so
dd m4ng
diQn :
-
Dubng dAy Ab r IJd,: 220
kV. dai
80 km. ddy d6n
c6 di€n tro
r0
=

0,13
ohm/km,
kh6ng
x6:0,36 ohm/km,
dung
d6n bo:2,4.10-6
ohm.km
-
Mdy bi6n
6p T
r
Sd*
:
40000
kVA
,
220/22
kV, diOn
tro Rs
:
2,2
ohm, cdm kh6ng
Xs: 30,7 ohm
(
Re
,
Xe
qui
v,i phia
cao 6p

)
,
APo
:
150
kW,
I0%o
:2o/o
.
-
Dulng ddy
cdef r IJdn'
:
22
kV
,
ctrng ti6t diQn
dAy,
diQn
trcr r0
:
0, 13 ohm4rm, cdm
kh6ng x6: 0,36 ohm/km . Do4n
cd ddi 4 km, doan
de dei 2
km,
doan
ef dai
3
km .

-
Phu
tii
I P"
=
40lv[W
c
S",
-+
s/
hs
pa.
=
gMW/
(c6ng
su6t
tii
ph6n
b6
d€u
tr6n
doqn
de)
Pr
=6 MW
-,E-ign
rip
:
LJr
:2t

kV
d
php
tdi
e
hp
sti
c6ng
sudt
0,g
tr6
Hdy
tinh
:
,.1 ?ie"
dp
.U"
o
thanh
cdi
c
.
?
i-"""ffItr3;ri?
.u"*;
ddv
ph6n
phtii
caer
vd

c6ng
su6t
S.1
phia
thanh
c6i
22
ky
:l ?le"
6p
Uu
tai
thanh
crii
b
.
o]
Pi?r
dp.Ue
rai
rhanh
crii
A .
e)
HiQu
suAt
tei
di0n
cta
Auorrg

ddy
220kV,
he
sti
c6ng
sudt
o
A
.
Lr
E
Choh€
th6ng
di€n
nhu
hinh
v0:
y;;y,#^:!?:f
ltl?_'ffi
:;:ru:,,[{#;,1,!i#,#;J1XE,#!F;::si6uquridQ;,,=
G2
c5
cdng
su6t
r
0o
Nff;,J',s
k;;
khTg
ti

ffi
il
ao-*,=zb?ffiu'n*
.ou
thri
tu
nghich
bdng
2,o/o:
r,h6nu11o
,rrn;"
ruro"Jia",
rci,,:
rniri,lj.glr.rr6ng
ntii
ddt
aeng
5%.
Fi3ii#i#'.:ifl**,uffi;1T*-*9;
.#"i,i"",
oor,rv,t
'i,,i'i,ii'rv,
to
e6u
ddy+am
S.a
htffit?#ffit
il;'i";;;;"b#
khring
trd

thri
ts
nghich
bing
20
ohm;
kh6ns
trd
trtr
qua
anh
hucrng
cria
di6n
trd.
a/
Thanh
lfp
so
aE
""y
tr'a'ii''o
thu{n,
nghich,
kh6ng
cia
hQ
thiing
tr6n,
tfnh

rheo
ccr
b6n
r00
MVA.
iii#;til.fsJ"Htrt
thf
ts
thu{n,
nghich,
kh6ng
cia
hQ
thting
tr€n
dti
tfnh
ng6n
m4ch
3
c/
Tinh
dong
ngin
mach
1
pha
t4i
2l%dgan
duong

ddy
L.
r
CAU
3:
B
r
I
//
Cau 4:
3
A.
DQng
co d6ng bQ
cgc
an
3
pha
480
v,
100-kvA,
he
s6
c6ng
suat
0,g5
tr6,
60
Hz,2
cvc,

stato
n5i
Y, c6.diQn khang
a61^g.b0.(pha)
Xdb:
1,5
ohms.,
vattentrd
da;-q;6"^pria";e
(pha).
Du3B
bi6n
tAn
Oe aieu
chinh
tOCaO
eOng co
tir 300
d6n
1000
vdng/ phrit.
Hdy
x6c
dinh
c6c
y6u
cAu sau:
Q
r-'
a/ Ph4m

vi di6u chinh
tAn
s6 dO
thuc
hi6n
thay
d6i t6c
d6 tr6n.
b/ Gi6
tri
sric diQn dQng
E0 .
Khi
d6ng
co ldm
vi6c
o dfnh
mtc.
cllinh
cdng
sudt t6i da
me
d$gglo
tn0
cung c6p
cr dong
kich
tu,
tAn
s6

ddng
diQn
stator
d
cn6
AO
dinh mric.
,d/
Tinh
gi6
tri sric diQn
dOrlg
Eo khi
d6ng
co li.rn vi6c
o t6c
d6
300 vdne/phtr.
e/
Khi cho
ring
9le1
ap
cAp
cho
ddng
co
ti le thuan
v6
tAn

ro. rinfr
16"9
.uAt
toi
ea
md dQng
9o
c6 thO cung
c6p
khi ddng
ccr
ldmviQc
d 300
vdng/
phirt.
Q
f/
Suy ra mdi
quan
hQ
gifra
c6ng
su6t
tOi
da
mi A$ng
co c6 th6
cung
e6p vd
t6c

dQ
d6ng
bQ cria
dQng
co.
TSSEII.BO2
DA.r Hec
eu6c
cIA
rP.
HO
ciri
MINH
rnuiiNc
EAr sQc BAcn
KHOA
Hqr DoNG
rurEN srNH
sDH
nt
rnr rrrynN
srNH cAo
Hec
NAnn 2010
chuy€n
nganh , .TLait. n'
' |!t*oq.
.rA t-); df
.
.

LIon Thi
'
.Ql.
-td:.
.Ki.
hlr',,6t.n,Se.
.
.:. . .
Thoi
gian
lAm
bdi:
180
phfit
d
fhOng dugc
phdp
dtrng
tii liQu
[J Dugc
ph€p
dirng tii liQu
oA thi s6
: . . .{,.
. . DA
thi
gom
. 12. fiang.
Biri
l: M6y biiSn

6p 3
pha
A-Y-11, 40 kVA,
10000Vi400V, 50
Hz,
t6n hao khdng
tii Po
:
0,195 kW, ddng khdng
titilso6:4
(ddng
kh6ng
tni
bAng
4Yo
dingtllnh mrlc),
t6n hao ngin m4ch
Pn*
:
1,1 kW, diQn
6p ng6n m4ch
IJn
Vo
:
4,5)
gi6
fri bi€n
t16
c6m img tir trong
16i thdp B.n

:
1,67
T. Tinh:
a/
coscps
vi cosgn,n
khi kh6ng
tdi
vd
khi ng6n m4ch.
bl DiQn
tr&
tuong
duong vi iliQn
kh,ing tuong duong
(Rr+R'z),
(Xr+X'z).
R'2
vd X'2 dn
luqt ld
di€n trcv vd c6m khring
tan
cua ddy
qudn
thrl
c6p
dd
qui
e6i
ve so cAp.

c{
DiQn 6p tr€n m6i vdng
dAy uupn*
$ing
diQn. 6p
di.nh
mric cria ddy
quiin
chia cho
s6
vdng ddy),
s6
vong d6y so cdp W1 vd
thri
cdpW2,
cho bitit ti6t
diQn
l6i th6p A1: 65,4
crrf .
d/
Eign
trd
ddy
qu6n
so
c6p R1, cho bitit chi6u dni trung
binh I vdng
ddy
\:A,567
m, tiiit diQn

cfia ddy
diQn
tu so cdp
,4.1
:0,503
mm2 vi diQn tro sudt
p
:0,024
pC}.m
e/ Tit* diQn
diy tti$n
tir thrt c6p
42, ndu
nhu m{t ttQ ddng
trong ddy
qudn
so cdp vd thir c6p h
nhu nhau
f/ DiQn
tr0 d6y
qudn
thrl cAp
&.
Biri
2: M6y
ph6t
turbine
hcri cpc tu An :
pha,
13,8 kV,

10 MVA,
0,8 tr6, 501fr2,2 crqc, n5i
Y, c6
di$n kh6ng
ddng bQ )fu6
:
12
Qlphavi
diQn tr& ddy
quAn phan
rmg R*
:
1,5
C)
/pha. M6y cl6ng
bQ
tr6n ldm viQc voi
ludi
ctiQn vd ctng lcm.
a/ Sftc diQn
dQng E0 khi
mdy lim viQc
vdi tai dinh mric?
b/ G6c tai 0
(g6c
l$ch
pha gita
E6o6u
vd Upr,J
l5hi

m6y ldm
viQo
v6i
tdi dinh mrie?
ci
N6u
giii
ddng
kich tu ld khdng tl6i,
cdng
su5t
phdt
ra cgc tlai cua mfy? D0
dU
tr&
cdng su'At
(P*u*iPa*)
khi lim
vi€e
o tai dinh mtic?
d/
Khi miy
phhtru.d"j*At
A;
dud cgc d4i,
tinh
c6ng
suAt
phan
khang

cinm6y?
Mdy ti€u
thlr hay
phrit
ra
cdng
su6t
phan
khang
khi d6?
VC
gi6n
d6
vecto
cho th6y hqat
dqng
cinmity
trong
tinh f4ng niy?
Ghi
chri
:
Trane.f
tl
a
.'!l
Cho
mang
ttign nhu
hinh vE

v6i:
G1
,
M6y
ph6t
,
c6ng
su6t
20 MVA,
tliQn
6p <tAu cyc
1lkv,
khring
tr&
(cdm
kh6ng) thri tp
thufln vi
nghich
b[ng
nhau
b6ng 0,1
tton
vi
t-uffig eOi
lavtC;,
kheng
fie iht
ry
kh6ng
b6ng 0,08

tfvtd.
.
Gr,MAy
pt6t
,
c6ng
su6t
10 MVA,
diQn
6p dAu cuc 1lkv,
khane
tro thrl
qu
thufn
vd nghich
bdng
nhau bing
0,15
dwd, khdng
tr&
thri
t.u kh6ng
bing 0,10 ilvtd.
Trung
tinh
mriy
phrit
G2
n6i
d6t

qua
cu6n
d6y c6
khdng
trd
h zc
=
0,01 dvtd.
T:
Mdy
bi6n
6p
,c6ng
suit
Eo
MVA,
khring trd
bang 0,08 dvtd
,cAp
dipn
6p1lkv/33kv.
L:
Euong
ddy c6
tdng
tr& thri
t.u thuAn
vi nghlch
bdng nhau
bing:

xr
=
x2
=
I +
ja
(O)
;
t6ng tro
thri t.u
khdng
bing : xo=
2+
j8
(O).
Hay:
a-Thdnh l4p
so
dO thl
t.u
thu{n,
nghich
vd
ktr6ng cho mang
diQn tr6n,Tfnh
so d6 tucrng rlucrng
Thevenin
thi tW
thuAn,
nghich,khdng

nhin
tt di6m N.
b-Tinh
toan ddng
ng5n
mpch
3
pha,
2
phachpm
nhau vd I
pha
ch?m
aNt+idiem
N.Cho bi6t
trudc khi ngiin
mpch
,m?ng
eiQn
kh6ng
tai.
c-Tinh ddng
ph6n
b6
tr0n mdi may ph6t
khi ngin
mpch 3
pha
tpi cti€m
N.

TSSDH-B02
- Duong
d6y
ABr IJd,n: 22AkY,
dei 120
lcn,
d6y d5n
c6 dign tro
ry:0,I2
ohm,{km,
cdm
kh6ng xs:0,45
ohm.4cm,
dung ddn bo:2,8.10-6
Biri
3;
Cho s<r
<16 m4ng
dign :
A
Bii 4:
,'1 (^*,
- Phu
tAi B:
80
MW,
hQ
sO c6ng
srlSt
cosg: 0,8,tr6

-
Ei6ndpdB:
Un
:220
kVophgtaiB.
Hdy
:
a)
Thdnh
l{p
scr
t16 thay
th6 cua
<luong
d6y .
Tffi:
b)
EiQn
6p Uo
d thanh c6i
A,
phAn
trEm
sgt ap
LU% .
c)
T6n th6t
c6ng
suAt t6c
dUne

va
phin
khdng trOn t6ng tro
cira
rtudng ddy
.
d) Cdng
su6t
,s,
,
hQ stl c6ng
suAt elAu A cfia
duong ddy,
higu
su6t
tai dign
.
e)
DiQn
6p
<IAu B ltc
khdng tii
.
Ghi chri :
Trang.2,^.
TSSEH-BO2
DAI
HQC
QUOC
GIA

TP.
HO CHI
MIi\iH
rRrtoNc DAr Hqc
BACH
Kr{oA
HQI
EONG TTIYEN
SINH
SDH
oOo
pE
rnr
sAU
EAI Hec nA.vt,zooq
Pe tni
gdm
.Qf
nang.
l"
s
di€n :
Cho so
dd man
A
t-
I
BTC
fiOr-Fs"
-

Eucm*
Cdy AB:
Uc.:
110
kV, dai
50 km, ddy
ddn
c6 rtiQn
trO
re: 0,19
ohm/km,
cim
kh6ng xs:0,45
ohm/km,
dung
d5n
bs
=
3,1.10-6
1
-
\Aaf-bigq-gp-T
I
Sd*= 40000
kVA
,
l10l22kV,
diQn
tr6 RB
=

2,5
ohm
,
c6m
khang
Xs:
38
ohm
(
Re
,
Xs
qui
vA
phia
cao 6p
),
Apo
:
170
kW,
IsoZ
:
l,5oA .
Phu t_ti C :
25
MW,
hp
sd cdng
sudt

cose:
0,8
tr6
-
Ei€n 6p
s_.le :
Uc
:21
kV
d
phU
tAi C .
Hdy tinh
:
a)
DiQn 5p
Ur
0
thanh
crii B
b) T6n thdt
cOng
sudt
tdc dung
vd
phdn
khdng
trong
ddy
qu6n

vi
trong
sit cria
mriy biOn
6p
.
COng
sudt
Sa
&
phia
cao
6p
cria
mriy
bii5n 6p
T .
EiQn
6p
Un tai
thanh
c6i
A .
C6ng
su6t
S, vn
hQ s0 c6ng
suAt
d0u
A cria duong

ddy
.
c)
d)
e)
Ghi chir :
Trang.fi.(.
t._
TSSETT-BO2
EAr
Hec
euoc
ctA
TP. l-lo
cui MINH
TriltoNG
DAr
Hqc
eAcH
KHoA
gel
oONc
rwBN
sINH
sDH
oOo
EE THI SAU
DAI
HQC
NAtvl

2009
Tuydn sinh
:
E[
cAo
HQc
I NcnrnN cu^r; srNr{
2. Cho
hQ
th6ng
diQn
vd th6ng
s6
c6c
phAn
tir tr€n
hinh v6:
=
1-00MVA
13.81(\/
X1
=X"-0.15
Xz
=
0.17
Xo
=
0'05
{J Ya
\

100MVA
e
13.8KV
5
Xr=X"=O.fS
I
Xz
=
0,17
-=L-
-Y
-T
t\
J-tr
;
IVA
138r(\/
0.1
OOMV
t-LlLi
(=O
N
101
3.8KV-
X
1
lOOMVA
138KV-Y/13.BKV-A
X=0.1
Xo

=
0.05
-
Xn
=
0.05
,,
,
C6, kh6ng tr6 cria,m6y
phit,m6y bii5n
6p vd dQng,cc dugc cho
trong don,vi
tucrng
eOi
@er
unit)
,kh5ng
trO dudng ddy
cho trong
dcrn
vf c6
tOn .
Di6m
trung
tinh
cira m6y
ph6t
vd m6y bi6n
6p A-Y
dugc

nOi eat trpc
tii5p. Di6m
trung tinh ctra dQng ccr dugc
n6i ddt
qua
diQn tr&
kh6ng
Xn:
0.05 theo don vi
tuong d6i.
a) Ve scy dO ttray th6 tht tp thu{n
,
thri
t1r nghich
vd
thri t.u
kh6ng vdi
gi6
trf co
b6n li
100MVA, 13.8 kV trong virng m6y
ph6t,
b)
Eua m4ng
thri tg vii
mpch thevenin tucrng duong khi
nhin tu
nrit 2.
Cho
bitit

tlign
rip tru6c su co
tpi
dAu
cgc m6y
ph6t
:
Vr
=l'05Z00
th.o
don
vituong d6i.
''
.)" Ddng tai truOc sg cO
dugc
b6
qua,
tinh
ddng'ngin'mpch
khi xdyra chqm
Xr=Xz=20Q
Xo
=
60fi
Ghi chri :
Trang
b2-
TS!;[iId-r](i:
DAr
HQC

QUOC
GIA
TP.
FIO
CHi M[].lil
TR.tloNG
EA.I
HqC
gACll
I'iE{oA
HQI
DONG
TUYEN
SINH
SEH
oOo
un
rnr
sAU
EAI
HgC
NAtvt
2009
[]
xcmtN cw srNH
Mdn Thi
: . . .
\[.6.1t
C 'llr:a.<A't:r*tZ7S. . . i . . .
:

Thoi
gian hm
bni
,
.
.[ E>
phrit
(Kh6ng
A"-nq
ph6p
dirng tni fiQu
)
oA tr,iro
:
.
.,.ARu
DA
thi
g6m
.
.Qf,t
ung.
Tuy6n sinh
:,K cAo
rrqc
t
Chuyon
nginh :
.
.

r':ftsryt
f/.i
3. DQng
cokh6ng
ct$ng
b0
c6
c6c
s6liQu
sau:
3
pha;
50 Hz;
L-220
V- 11 A;
Y
-
380
V- 6,4
A;
1455
vong/Ph0t;
cos
g
:
0.80
a) DQng
co
dugc
"ap

diq"
bing
ludi dign
3
pha
50
Hz,
diQn
6p ddy
380
V' DQng
co
phii
'
cO
tleu
nOi
day
nao
(+
hay Y;
ee
tam
viQc
binh
thudrng?
b) SO
cgc
ddy
qrrhtt

stato?
.j
po
tru$
dinL
mftc
o/o?
d-)Khi
thft
nghiQm
khdng
tai 6
910nrpdinh
mrig
co
dusc
c6c sd
liEu
do:
-'cdng suAtiieu
thu:
Pa
:260
{v-:= _
;;
:
'
l
-
dong

diQn ddy:
l 3,2
A
ronhaocshalldl30w.
:'
I'
"
r'
l
Dign
tr6
do dugc
khi
n6ng
cira
mQt
pha ddy
qu6n
stato
ldi r: 0,65
ohms.
Tinh
tdn
hao
sit.
Ghi
chti:
DAr
Hec
QUoc

crA
Tp.
no
cui
MrNH
rty^gIq.?,fr
Hg_c
nAfir
KrroA
HQI
EONG
TLIYEN
SINH
SDH
oOo
TSSE}I.ts02
I
DE
THI,
SAU
DAI
HQC
NAM
2009
I xcrutN
crru
srNrr
i
@.y^t:f
,lo_*,t,q*::

cdcso
lieu
sau
:
230
yt24y;50
Hz;
630
vA;
11,2
kg
7)'I'Ong
ciic
t6n
thdt
khi
ldm
viQc
tai
dinh
mric
ld
54,g
W
Tinh
hiQu
su6t
cria
m6y
khi

mang
tai
dinh
mrrc
& 2
tru#g
hgp:
cosrp
2
:
r,1vi
cosg2
:
0,3
?
b) Tfnh
ddng
dlnh
mric
d6y quAn
thf
c6p
I2dm
?
c)
cho
bi€t
crlc
t6n
thAt

khongtii.(tOn
hao
sit)
ta
3.2,4
w.Tfnh.t6n
th6t
ct6ng
d
tai
dinh
mfrc
? Tinh
Rs,
id
tOng
diQn
trd
c6c
ddy
qu6n
scr c6p
vd
oay qu6"
irrt;6p
kfi
ilft6i;a
dav
ggeaJhrleap ?
d) EIOn

6p roi phia
dfly quan
thu
c6p-
khi phs
t6i
dinh.mi:
l1n
vigc
o cos
92
=,
a,6
dtitrh
cd"m)
ln
3,5o/o
cua,diQn
6q
Ait"*t
muc
U2dm (U2din-:
24
v).Tinir
Xs,
id
t6ne
tii€n
khrine
tan

tu c6c
d6y
qu6n
so
c6p
vi
d6y
qu6n
thri
c5p
khi qui
ot
"aigy.ot*'t-il{,-6irur."r6
iii
chri
:
'/
o€
rnl
ri
rnuAr
stFru
z
Thdi
gian
tam
bai:90
phrit.
sinh
vi6n

duqc
phep
s0
dqng
titi
li6u.
I
L
tl
t'toY
,ir\
v
,/
,1\
1.
May
Oidn
dp
phAn
phdi3
pha,20
kVA,4600/230
V,50
Hz,
c6 cdc
so
tieu
thrS
nghiem
sau:

Thit
kh6ng
f6i:
di6n
6p
dinh
mfc
duqc
drja
vdo
phia h4 6p,
phia
cao
6p
Od
n6 mach,
sau
d6
do
di6n
dp
dAy,
dong
di6n
ddy
vd cOng
sudt
tieu
thu'
IJo

=
230
Y,
lo
=3,5
A,
Po
=
152
W'
Thit
ngdn
mach:
dirOn
dp
ha
thdp
duqc
dua
vAo
phfa
cao
dp,
phia
h4 ap
duqc
ngSn
m4ch,
sau
d6

do
di6n
6p
diy,
ddng
di6n
dAy
vd cOngudt
ti6u
thu'
lJnm
=
225
V
,
lnp
=
4,35
A,
Pnm
=
360
W'
a.
Tinh
cdc
th6ng
s6
c0a
mdY

bidn
6P
b.
Tinh cdc
ddng
dinh
mfc
phia
cao
6p
vir
h4
6p'
2.May
phdt
dien
ddng
b0
3
pha,
c\Ic
trl dn,
50
H2,60
MVA,
13.2
kV
,
day
qudn

stato
ndi
Y,
tim
viQc
song
song
vdi
lrroi
di6n
phAn
pn6i
vd
c0ng
ldn
c6
diQn
6p
(day)
13,2
kV'
Di6n
kh6ng
ddng
bO
c0a
m6y
ph6t
ddng
b6

ldr
x66
=
3.4b5
O
.
Khi
c6ng
sudt
ra cOa
dQng
co
so
cdp
lir
50
MW,
ddng
kich
trj iy1
co
giS,tri
1000
A,
h6 s6
c6ng
sudt
bdy
gio
cosrp

-
1,o'
GiA
s0
mdy
phAt
d6ng
bQ
lAm
viQc trong
di6u
kiQn
mach
tt
khOng
bAo
hda
vd b6
qua
tdt
cA
cdc
tdn
hao trong
mAY.
a.,Tinh
dong
di6n
phdn
rlng

dinh
mrjc
ls67nvdv6
mach
di6n
tudng
dUong
cho
mdy
phat
ndivdi
hjdi
di13n
b.
Khi
c6ng
sudt
tr6n
r6to
cfia
dong
co so
cdp
v5n
la 50
MW,
t(nh
dong
kich
tr-t cltc

tidu
ikt^i,
,
khi
d6
xAy
ra hien
tuqng
mdt
Cdng
bO
c0a
mdy
?
c.
Tinh
dong
phdn
rJng
/ytddng
rlng
vdi didu
ki6n
lirm
viQc
cdu
b/
3.
OOng
cd

khOng
ddng
bO
3
pha,30
0OO
HP
(
1
11p
=
746 W
),
13,2
kV,60
Hz, kidu
giAi nhi6t
bhng
nrJdc-khong
khi,
k6o
mot
mdy
n6n
turbine
tqi
mot
nhir
mdy
sAn

xudt
khi
oxygen'
DQng
co
co
t6c
d0
dinh
mtlc
1792,8
vlphut,
sau
d6
qua
trung
gian m6t
h6p
sd,
t6c
d6 ndy
duqc
tang
thdnh
4930
viphrit
va
k6o
mdy
n6n

khf'
Ddngcoc6hi6usudtldinhmtrc)'tamoc=98'1%'hes6c6ngsudtldinhmfc)costp66=
o;90.Momentmdm6y(trUctidp)Mnm=O'TxMoment-dinhmrlcM6'n'Dongstatomdmdy
(
trLJc
tiSp
)
lmm
=
4,9xDdng
stato
dinh
mtlc
166.
Cho
biSt
hi6u
sudt
c0a
hdp
sd
trong
didu
ki6n
ldm
vi6c
dinh
mfc
ld
qamUS

=
0.96'
T(nh
:
a.
Dong
siato
dinn'mfc
,
Moment
dinh
mtic
(
tran
truc
ddng
cO
)
,
Dong
stato
m6
mdy'
Moment
md
mdy
b.
T6ng
tdn
thdt

c6ng
sudt
luc d6ng
cd
k6o
tAi
dinh
mrlc,
Tdn
thdt c6ng
sudt
trong
dAy
qudn
r6to
ndu
Uidt
tdn
thdt
do
ma
sdt
vd
qu4t
gio
la
62
kW
c.
Moment

ngay
tai
trr;c
vdo
c0a
mdy
n6n
khf
sau
:
1,25
1,5
1,0
0,8
0,9
0.4
0,6
0,2
0
/knAl
Eolvl
15
223
237
202
180
193
105
150
60

oE
rnl
KirHUAr
DIEN
2
Thdi
gian
titm
bdi;90
phtit.
sinh
vi€'n
duqc
phep
s(t
dqng
tai
li6u.
1.
DOng
cd
m6t
chidu
kich
tr1 song
song
c6 cdc
s6
tiCu
dinh

mtlc
sau
: 220
V,
vlpn.
xni
thfi
nghiem
kh6ng
tai
(dAy
qudn kich
ttJ
dQc
lap,
tdc
d0
quay
lir
5,86
kW,
1500
dlnh
mtlc)
co
dudc
ba
Di6n
trd
dAy

qudn
phdn
rlng
la
rU= 0'8
O
'
Di€n
trd dAy
qudn
kich
ttl lir
rkt=
147
tl
'
86
qua
hien
tr;qng
phAn
rlng
phdn
rlng.
T6n
hao
kh6ng
tai
(
bao

gdm
tdn
hao
sit
va
tdn
that
c6ng
sudt
co
hgc
)
la 653
W
vd
kh6ng
thay
ddi
theo
tdc
dQ
quay
cfia
r6to.
a.
Tinh
moment
dinh
mtJc
Mdm'

'l
.
'
b.
Tinh
dong
phdn
ung
dinh
muc
/ddm.
c.
Tinh
diQn
trd
m6
iay
n*,
mdc
noi
tiSp'tren
mach
phdn
rlng
sao
cho
khi
m6
mdy'
dong

md
m6y
trong
phdn
ttng
tUmm
=
1,3
IUdm'
,
2.rttay
phdt
di6n
ddng
bo
3
pha,
cLJctd
dn,50
Hz,60
MVA,
13.2
kV,
daf
qudn
stato
ndi
Y,
ldm
vi6c

song
song
vdi
[Jdi
di6n
phan
ph6i
v6
currg
ldn
c6
di6n
ep
(day) 13,2
kV' Di6n
khang
ddng
bO
coa
mdy
phdt
d6ng
bg
la
(
1,2
p.u
)
xdb
=

O .
86
qua
tdt
cA
cdc
tdn
hao trong
mdy'
Xni
cOng
sudt
ra c0a
ddng
co.o
cdp
la 50
MW,
dong
kich
til ikf
co
gid
tri 1000
A,
h6
s6
c6ng
sudt
OdY

gid
cosrP
=
1,6.
a.
Tinh
dong
di6n
phdn 0ng
dlnh
mtlc
ludm
va
v6
mach
di6n
tddng
dudng
cho
mdy
phdt
n6i
vdi
ltjdi
di6n
b.
Khi
c6ng
sudt
tr6n

r6to
c0a
ddng
co
so
cdp
v5n
lir
50
MW'
tinh
dong
klch
ttl nh6
nhdt
iktmin,
khi
d6
xAy
ra
hien
tuOng
mat Odng
bQ
c0a
m6y?
c.
Tinh
ddng
phdn

fng
/r/tudng
ung
vdi
didu
ki6n
ldm
vi6c
cau
b/
3.
Uay
biSn
6p
phAn
phdi
3
pha,
20
kVA,
4600/
230
V, 50
Hz,
c6
cdc
sd
tieu
th& nghi6m
sau

:
Th|
kh6ng
tai:
di6n6p
dinh
mrlc
duoc
drja
vdo
phia
hq
6p,
ph(a
cao
dp
dd
h6
mach,
sau
d6
do
dirOn
6p
dAy,
dong
di6n
dAy
vd c6ng
sudt

ti6u
thu'
IJo
=
2go
V,
lo
=
3,5
A,
Po
=
152
W.
Thit
ngdn
m4ch:dign
dp
ha
thdp
dr;qc
d.ta
vdo
phia
cao
dp,
phia
hq
ap
dugc

ngdn
m4ch'
sau
d6
do
di6n
Ap
dAy,
ddng
di6n
dAy
vi
cOngudt
ti6u
thu'
t)nm
=
225
V,
lnp
=
4,35
A,
Pnm
=
360
W'
a.
Tinh
cdc

thdng
sd
c0a
mdY
biSn
AP
b.
Tinh
c6c
ddng
dinh
mdc
phia
cao
Ap
vd h4
dp'
4.
OEng
cd
khong
ddng
bO
3
pha,30
000
HP
(
1
y1p

=746W
),
13.2
kV,60
Hz,
kidu
giAi
nni6t
bing
nLroc-khong
khi,
k6o
mot
mdy
n6n
kidu
turbo
tai
mot
nhd
m6y
sAn
xudt
khioxygen'
DOng
co
co
t6c
do
dinh

mttc
1792,8vlphut,
sau
do
qua
trung
gian m6t
h6p
s6,
tdc
d6
niry
duQc
tdng
thAnh
4930
v/phut
vir
k6o
mdy
n6n.
Dong
co
co
hi6u
sudt
l
dinh
mfc
)

'tdm
=
9B'1%'
hQ
s5
b6ng
sudt
(
dinh
mfc
)
cosrpdm
=
0,90.
Moment
m6
m6y
(
trLlc
tidp
) =
0,7
Moment
dinh
mtlc'
Ddng
stato
md
m6y
(

trLtc
tiSp
)
=
4,9
Dong
stato
dinh
mfc'
Tinh
:
a.DdngstStooinnmtc,Momentdinhmtrc(tr6ntrr;cd6ngcd),Dongstatom6m6y,
Moment
m6
m6Y
b.
Tdng
t6n
thdt
c6ng
sudt
tric
d6ng
co
k6o
tai
dinh
mrjc,
Tdn
thdt

c6ng
sudt
trong'day
qudn
r6to
ndu
oldt
tdn
thdt
do
ma
sdt
vd
quqt
gi6
lir
62
kW
c.
Moment
ngay
t4i
trqc
c0a
m6y
n6n
khi
d
1)
p+r

r+b"
qucjc
cIA
rP.
Hd
crfr tvtINH
TRUC'NG
DAr
HOc
nAcs
KH0A
Hot oor{i
ruv€N
sINH
sDH
^'
DE
THI
SAU
DAI
IrgC
NANI
2002
Tuydn
sinh
:
cAo
HQC
n
,

NpIIIEN
CuU
SnlH d
Chuyen
ngirnh
,
.

.'tZ**.al*/
ivton
ri,i : cd
BAN
n
cd
sd
I clrwgx
xcixn
Ei
Thdi
gian
lim
bdi, ./.t?
. .
phrit
TSSDH.BO]
f\f\
4
Kh6ng
drrgc
ph6p

Dd thi sd: .
Ciul:
Mriy
bidn
aip
phdn
pfrdi
a
pha,
100
kVA,
Yo /Yo,50
Hz,
Oien
ep
(day)
so
cdp
15
kV.
Mach
ttr cira
mdy bidn
dp
c6
Xndi
luOng
320 kg, lam
bing
cdc

ld'thep
kTthudt
di6n
c6 sudt tdn
hao 1,2 W/kg
(d
cam
fng
trr
cuc
dai BM la
1,0
T).
Tiet
di6n
l6i
thdp
c[ra mach
trt lir 380 cm2.
Cric thft
nghi6m
:
-
khdng
tiri
: di€n iip
(day)
so
cdp
le 15

kV,
di€n
ap
(day)
thf
cdp
do
du0c
la
231
V'
-
ngan
mach
: di€n
ap
(day) so
cdp la
600
V,
cdng
suettidu
thu
le
1750
W,
dong
thrl
cdp
la 250

A.
a/Tinh sd
vdng
ddy so
cdp
W1, khi
cAm
fng
tr} cgc
dai ld
By
=
1_,3
T.
b/
Tinh
tdn hao
sit d
giii
tri
cim
rlng
td
ctJc
aai nay
(Bv,
=
4fiT)
c/ Tinh
cdc

gi{
tri
di6n
trd ng6n
mach
Rnr
vA
di€n khdng
ngan
mach
Xnr
,
nhin
trr
phia
thri cdp.
d1 Miiy
bidn
rip cung cdp
c0ng
sudt'dinh
mdc
cho t&i co
tinh
cAm
c6 hd
sd
cOng
suAt
cos<p

=
0,6.
Tfnh di€n
aip
(dAy)
thd
cdp
vd
hi€u sudt
c0a
mdy
bidn ap
6 Oidu
ki6n
lam
vi€c nAy.
Cd thd
dp
dung bidu
thrJc
tfnh
d0
sut dp
(tinh
bdn
thr1 cdp)
:
AU
=
Rnm.12.cosQ2

+Xn6.12.sing2
vdi
:
Rn,n
,
Xn*
ldn
luOt
ld
didn tr3
ngin
mach
vd
di€n khdng
ngin mach
,
nhin
trl
phfa
thti cdp.
CAu
2 : DQng
cd
mot chi€*u
kich
trl
doc
ldp
,
c6

cdc thdng
sd
Cinh
mdc
sau
:
-
di€n
6p
cung cdp
cho
phdn
tlng
U=
250
V
-
dong
phdn
Ling lu
=
50
A
-
ddng
kich ttt irt
=
1,5
A
-

di6n trd
phdn
dng
Ru
=
0,3fL
Khi
tam thi
nghi6m
kh6ng
tai
(
may
lirm vi€c
d
chd
d6
m6y
phtit
):
Uo
=
308
V,
is1=
'1,5
A v;i
tdc
d0 n
=

1200
vOng/phut
t_ ,/
tiri li€u
Lf
Drr{c
ph6p dilng
tAi lieu
I
Dd
thi
gdm
Q.
'*ong.Mrc
3
-f/.>,-y
1-
Khi
ldm
thi
nghi6m
kh6ng
rai
(
meiy
tdm
vi€c
6
ch6
do

d6ng
co
):
cdng
suet
ti6u
thu
ugi
pndn
d'ng po
=
b2ow,
U
=
250
v.
Trong
sudtOai
todn,
ludn
gi0di6n
dp
U
=
250
V,
irt=
1,5
A.
a/

Tinh
dong
khOng
tai
lo, tdc
dO
dQng
co
lric
khdng
tAi
no.
Chfng
minh
r&ng
khi
mdy
ldm
vi€c
kh6ng
tai,
c6 thd
b6 qua
tdn
hao
Joule
so
vdi
cdc
tdn

hao'khdc.
Suy
ra
moment
khdng
tAi
(ma
sdt, quat
gi6,
do
tdn
hao
s[t;
mo.
Sau
ddy,
mo
dudc
xem
khdng
phu
thuOc
vdo
t6c
d0.
b/
Tinh
cdc
gid
tri

srlc
di€n
dOng
cam
fng,
tdc
d0,
moment
cli6n
trl,
moment
tr6n
truc
mdy
trong
didu
ki6n
tAi
dinh
md'c.
c/
chr-lng
minh
ri.ng
moment
di6n
td
ti
l€
vdi

dong
phdn
ring
Iu.
d/ Tinh
cdc gid
tri
stlc
di6n
dong
cAm
ring,
tdc
dd,
moment
di6n
tr],
moment
tr6n
trUc
mdy
trong
didu
ki6fl
l,-i
-
20
A.
Bd
qua

diQn
dp
ni
tr6n
chdi
than, ph\n
tlng
phdn
tlng.
C€u
3
:
Mdy phdt
ddng
b6
3
pha
r6to
cuc
trl
dn,
dAy
qudn
stato
ndi
y,
5000
V,
50
Hz,

t6c
do
dinh
mfc
n6.
=
2s0
vong/phrit,
ddng
phdn
fng
dinh
mrrc
lu
-
200
A,
cosp66
=
0,87
tr6.
Dien
trd
dAy
qudn
stato
(pha)
Ru
=
0,02

O
. Tdng
tdn
hao
c6ng
sudt
co
hoc
ld
220
kW
(khOng
ddi).
Khithi
nghi€m
kh6ng
tii,
co
duoc
bing
sau
:
ir,t
[A
U
'10
20
30
40
so

iso
lro i.o
leo
100
Eo
o
lroso
jzroo
slso
I
4200
s2oo
jseso
l6sso
izooo
lzeoo
7500
vdi
is1
:
dong
kich
tr],
Eo
:
sric
di6n
d6ng (gid
tri
di€n

eip
day)
kh6ng
tai
.
Khi
thf
nghi6m
ng6n
mach,
vdi
dong
kich
tri.
ir.t
=
40
A,
dong phdn
fng
ng6n
mach
l, ,nrn
=
2500
A.
Tfnh
l
a/
sd

OCii
cUc
4
47.o,."n
2
l/?/4A4//'{./
r
(
ue*i"L&rl*,.4nA
)
br,di€n
khdng
ddng
bo
x*ffi
dcii trong
cdc
cdu sau
.
cl stic
di€n
d6ng
(day)
khdng
tei
Eo
,
khi tu inOng cuc dai
dLJdi
1 crjc

trr
la 0,025
Wb,
sd vdng
ddy/pha
ld
Wpna
=
810 vdng.
d/ stic
di6n
d6ng
kh6ng
tai Eo khi miiy
ldm vi6c trong
di6'u ki6n tAi
dinh mrJc. dOng
kich
trl lric
bAy
gid
?
e/
cdng
sudt
dinh mrJc
vA higu sudt
dinh mrJc c0a
maiy
?

Ciu
4 :
OQng co
khdng
ddng bO
3
pha,
4 cuc,
stato
ndi Y,
dUOc
cung cdp
di6n
dp
U
(gi{i
tri
di€n
ap dey)
co tdn sd
f tnay Odi OuOc
(trJ
bO bi6n
tdn). Sd vong ddy 1
pha
ddy
qudn
stato ld
Wpn
=

600 vong,
h€ s6 ddy
qudn
leq
=
i,0
,
di€n trd
roto
(dd
qui
Odi vd
stato)
R'2
=
1,0Q. 86
qua
di€n trd dAy
qudn
stato,
di€n khring tAn
tri
stato,
tdn
hao sat
cdng
nhr; tdn
hao co hgc.
a/ Tinh
tdc d0

quay
n
c0a dOng
co trong di€'u
ki€n
khdng tai,
6 f
=
50Hz
vd f
=
25Hz .
b/ Khi
U
=
400V
,
f
=
50H2,
tinh tt)
th6ng cuc dai ou
dtrdi
m6i
cuc td .
c/
chtlng
minh
bidu thr-ic
tinh Moment

di6n tr-r crla
dOng co
c6 dang
: M61
=
Cu.Qu.11'.
,
trong d6
Cu la
he sd cdn tinh
todn, lrr
=
thd.nh
phdn
dong
di€n
tdc dUng
stato
lr
(lr.,
=
lr.cosg).
Tinh hd sd
Cu ?
d/
Khi U
=
400V
,
f

=
50H2, tinh
11p khi dQng
cd kdo
tAi co
hqc c6
moment
cAn 20
N.m .
r
oE
rHl
mAy
olEr,t
-
rHtfi sl slEN
(
07 2000
)
Thdi
gian
ldm
bdi : 90
ph0t.
sinh
vi€n
dugc
phep
sfr
dung

tai
tiOu
1.
DOng co
khOng
d6ng
b0 3
pha,
100
HP
(
1
Hp= 746w
)
,
stator
ndi
y,
600
v,
c6
tOc d0 ddng
b0 1800
v/ph.
DQng
co ti6u
thU
cOng suA't
diOn P
=

70
kW,
ddng
stator
/s
=
78
A, tdc
d0
roto
nr=1763
v/
ph,
tdn
hao
sfit
pFe
=
2 kw,
tdn hao
do
ma
siit
va
quat gi6
pcd=
1,2 kw,
di6n tr6
do duoc
gita2

ddu cuc
c0a ddy
qudn
stator
R
s-s=
0,34Q.Tinh:
a/ cOng
sui't
truydn
tu stato
qua
rOto
(
1
d
)
b/
tdn hao
ddng rOto
(
1 d
)
c/ cOng sudt
co hQc tr6n truc
mdy
(
1
d
)

d/ hiQu su0t
1
0,5 d
)
e/
moment
tr6n truc
may
(
0,5 d
)
,
2. Dong coddng
b03
pha,
stato
ndiY,4000
Hp
(
1
Hp= 746W),6600V,60
Hz,
diQn khang ddng
b0 xdb
=
11 al
pha
,
200 v/ph,
lam viQc

6
tii
dinh mfc,
c6 h6
sd
cOng sud't
cosrp
=
0,8
sdm. Tfnh
:
a/ cOng sudt
bidu ki6'n
(
0,5 d
)
b/ ddng stato
(
0,5 d
)
c/ sfc dign
d0ng cim
ung Fo
(
0,5
d
)
d/ vE
gian
dd vecto

(
0,5 d
)
e/g6ctai
p(1d)
3.
DOng
co
1
chidu kfch
tit
song
song,
b0 HP
(
1 Hp
=746
w
),240
v,
650
v/ph,
khi
lim vi0c 6 tAi dinh
muc, ti0u
thp
dong
dien
173
A

til
luoi
diQn. DiQn
trO ddy
qudn
phdn
tng
ru
=
0,0705 o va
diQn trd
ddy
qud'n
kfch
tu
song song rkt
=
81 f) .
Khi
tai
cd hQc
tr0n trgc mdy
gitrm,
dong ti0u thU
tu
[Ioi
cfrng
gilm
theo
va

cdn l
70
%
giii
tri
dong
dinh muc. T[nh,
trong
didu ki6n lAm
viQc
gi6m
tii
n6i trOn
:
a/ s0c
diQn dQng cAm
ung
(
1
d
)
b/t0cd0
quay(1d)
c/ ddng tiOu thu
tr6n ludi
diQn
(
1
d
)

L
sE
rHl mAv
srEt
-
rHlEr
nl olEt
(
02.2000
)
Thoi
gian
ldm
bai :
90
ph0t.
Sinh Vi0n
dd0c
ph6p
srl dung
tai
tiOu
1.
DOng
co kh0ng
ddng
b0
3
pha
co tdc

d0
ddng
bO
la 1200
v/
ph,
tieu thu
tu lrl6i
diQn
c0ng
slt 80 kW.
Tdn
hao
ddng va
tdn hao
sdt trong
stator la
5 kW.
DQng
co k6o
tii
quay
v6i
tdc
Og
1
152 v/ph.
Tfnh
:
a/

cOng suit
truydn
tu
stator
qua
rotor
b/ tdn
hao
ddng r0to
c/
cong suat
trcn truc
mdy,
biOt rlng
tdn
hao
do ma
sat va
quat gio
la 2 kw.
d/ hi9u
sudt
e/
moment
trdn
truc
mdy
1.
2. Dong
cd ddng

b0
3
pha,
stato
ndi Y,
3980
V, dien
khang
ddng
b0 xdb
=
22
o/
pha,
co suc
dign
dOng Eo
(pha
)=
1790 V khi
dong
kich tu
ikt=25
A,
goc
tii
khi
do ti d=
300.
a/ VE

giln
dd
vecto
m0 ti
ho4t
dOng
cta dOng
co
b/ Tfnh
dong stato
c/ HQ
sd
cOng
suA't
3. D0ng
cd mot
chidu
kfch tu
song
song
co c6c
sd lieu
dinh muc
sau : 220
v,5,g6
kw, 1500
v/ph
DiQn
trd
d6y

qudn
phdn
nng li Rrl=
0,8
C) .
Dien
trd
ddy
qudn
kfch
tu ta
Rkt= 147
a .
Bd
qua
hien
illdng
phdn
1ng
phdn
hng.
Tdn
hao khOng
tii
(
bao
gdm
tdn
hao
s[t va

tdn thdt
cOng
sudt
co hqc
)
td
653 W
va
kh6ng thay
ddi tneo tOc
d0
quay
c0a r0to.
Tfnh
:
a/ moment
dinh
mtc
Mdm.
b/
dong
phdn
ring
d|nh
mrtc lldm.
c/
diOn trd md
m6y
Rmm
mic nOi

tidp
ir€n m4ch
phdn
ung
sao cho
khi
m0 may,
dong m0 miiy
trong
phdn
ung tumm
=
1,3
l[dm.
P
F
g€
rnl
mOru
nrtAy
olEt't
(
o2.2ooo
)
sinh vi6n
duqc
phep
st dqng tdi li6u.
Thoi
gian

tdrm
bdri :
90
phtit.
1. D6ng
co 1
chidu kich
trJ
song
song,50
Hp
(
1
Hp
=746W
),240
V,650
v/ph,
khi
tdm
vi6c
6
tai
dinh
mdc, ti6u
thu
ddng
di6n 173
A tu lttdi
di6n.

Di6n trd
dAy
qudn
phdn
fng
ry=
0,0705 A
vd
di6n tr6
dAy
qudn
kich t0
song
song rkr
=
81 e
. Khi tai
cd
hoc
tr6n
trqc
mdy
giim,
dong
ti6u thu
tf ludi
c0ng
giAm
theo
vd

con la 70 %
gi6
tri
dong
dinh
mrlc.
Tinh,
trong
didu
ki6n
ldm vi6c
giAm
tAi n6itr6n
:
a. srJc di6n d6ng
cAm
trng
(
1
d
b. tdc
d6
quay
(1d
c.
dong
ti6u
thu tr6n lUdi
di6n
(

1
d
2. D6ng
cd
kh6ng
d6ng bO
3
pha,
220V,50
Hz, 1OO
Hp
(1
Hp=
746W],0.0",
dAyquan
stato
n6i
A. Khi
d6ng
co ldm
vi6c
d tai
dinh
mrlc,
hi6u sudt
17
=
g1
"/o,
ddng

dinh
mfc
/1
=
248 A.
Cric tdn hao
sdt,
tdn hao
ddqg
dAy
qudn
stato, tdn
hao ddng
dAy
qqdn
r6to
tdn
trtgt
la 1697
w,2803
w, vir
1549 w.
Tinh,
trong
didu ki€n
taidinh
mrtc noi
tr6n:
'
a. cong sudt

di6n
ti6u thu
b6i
d6ng
co
(
0,5
d
)
b.
tdng
cdc tdn
hao
c6ng sudt
(
0,5 d
)
c. c6ng
sudt di6n
tr]
(
0,5
d
)
d. tdc
d6
quay
c0a r6to
(
0,S

d
)
e. h6 s6 cdng
sudt
(0,5d)
f. tdng cdc tdn
hao
cd hoc
(
do ma
sdt
,
quat
gio,
tdn hao
phu
X
0,5 d
)
3. M6y
ph6t
ddng
bo 3
pha,
460 v,
4
crtc,60
Hz,
day
qudn

stato ndi
y,
di6n
khdng
ddng
bo
xdb
=
1,46
Q/pha,
dttoc ndi vdi
ltJdi
di6n
v6
cing ldn.
G6c tAi
e h 2So
khi
m6y
cung
cdp
c6ng
sudt
t5c
dung 112
KW
cho ltJdi
di6n,
tinh :
a. moment

cria turbine
lAm
quay
r6to
m6y
phiit
(
1
d
)
b.
strc di6n d6ng cAm
rlng
( gi6
tri
dAy
)
c0a
dAy
qudn
stato
(
1 d
)
c. c6c
gi6
tri
cong sudt
bidu kidn,
c6ng

sudt tdc
dung,
c6ng
sudt
phAn
khaing
may
phdt
cung
cdp cho h]di di6n
(
1 d
)
d. h6 sd c6ng
sudt
(
1
d
)
Bd
qua
cAc tdn
hao
trong
mAy
vd
xem
mdy
nhtl
co r6to

crJc
ttr
dn.
)
i
i
t:
oE rnl nrtOn
rcT rnuAr
glEtt
2
(
rr.zooo
)
Thdi
gian
ldrm bdi
:
90
phrit.
Sinh
Vi6n
dtigc
ph6p
sff dgng
tii li€u.
1. D6ng co ddng bg
3
pha
rOto cqc

td dn, c6
cdc sd
tieu dinh
mrrc
: 2500
HP(1
HP=
746 W),
6600
v, 50 Hz,
2
cuc,stato
ndi
Y, ldm vi6c k6o
tai co
hgc
nhdt dinh,
khi d6
g6c
tai 0
=
28.50,
srlc
di6n d6ng
khOng
tai Eo
=
4500
V/pha. Di6n
khdng

ddng
bO
ld x66
-
15.8
O
/pha.6 chd
d6
tAi n6i
tr6n, tinh :
a/
moment
di6n
td
(
1 didm
)
b/
moment
tr6n
trqc c6ng
t6c clja
h6 truydn
cd, cho bidt
hieu sudt
truydn
cd h9c
ld
1l"o
=

94,3%
(1didm
)
c/ hQ s6
c6ng sudt
cosg
(
0,5
didm
)
d/ moment
dien
ti(
cuc
dai
(
0,5
didm
)
86
qua
diQn
trd ddy
qudn
phdn
tng
vd cdc tdn
hao do
ma sdt,
qu7t

gio.
2. DOng
cd kh$ng
ddng
b6
3
pha,
22OV,5O
Hz, 1OO
HP
(
1 HP=
746 W
),4
cuc, dAy
qudn
stato
ndi
A. Khi ddng
co
lirm viQc
d tAi dinh
mrjc,
hi6u sudt
17
=
91
"/o,
ddng
dinh mtlc

11
=
248 A.
Cdc
tdn hao sdt,
tdn
hao ddng
ddy
qudn
stato,
tdn hao
ddng dAy
qudn
r6to ldn
lugt
ta 1697
W,
2803 W,
vdr 1549
W.
Tinh, trong
didu
ki6n
tAidinh
mgc n6itrdn:
a.
cOng
sudt di€n
ti6u
thu b6i

d6ng
co
b.
tdng c6c
tdn
hao
cdng
sudt
c. cOng
sudt
di6n
trl
d.
tdc d0
quay
cria
r6to
e.
h6 sd c6ng
sudt
f. tdng c6c
tdn
hao cd
hgc
(
do
ma sdt
,
quat
gi6,

tdn hao
phu
)(
1,0 d
)
3. Ddng
co
1 chidu
kich tiJ song
song
c6 cdc
sd
lieu sau:
di6n dp
dinh
mfc Uo^=220
V,di6n trd dAy
qudn
phdn
rlng
rrt
=
0,4
e, dong
ti6u thu
dinh
muc
lo,
=
52

A,
di6n
tr6 dAy
qudn
kich
trj song
son$ 16
=
110
Cl
.
Tdc dQ
khi d6ng cd
chay
khOng
tii
ld no
=
1100
v/ph. ,
Tinh :
a/
stlc di6n
ddng
phdn
rlng
lf c
tai
dinh
mfc

(1
didm
)
b/
tdc d0
l0c tAi dinh
mfc
(1
didm
)
c/
c6ng
suat dien
til
vA moment
di6n
trr lf c
tAi dinh
mUc
(1
didm
)
C6 thd
bA
qua
dong
di€n
ti6u
thg cha
d6ng co

ltic
khdng
tdi'
0,5d)
0,5d)
0,5d)
0,5d)
(1,0d)
oi
tHr
xi
rHufl,r
or$N
Z
(
rcarsoocN,lG.os.rggg)
1.
DOng
co
ddngr
bo
:
pha
roto
cuc
tu
dn
,
Co
cd,c

sd
lier-,
d+nh
mdc
:2500Hp (
1Hp=746W),6600
V,
50
Hz,2
cUc,statondiy,
lam
vi6c
keo
tdi
co
hoc
nhdt
drnh,
khi
do
qoc
tai
e
=
28.5u,
stlc
di€n
dOng
khOng
tai

Eo
=
4500
V/pha.
pi€n
khdngr
d6ng
bO
f
a
Xdb
=
15.8
o
/pha.d chd
dO
tai
noi
tr6n,
tinh
:
a/
moment
di€n
trl
(
1
di6m
)
b/

moment
tr€n
truc
c6ng
tac
cira
h€
truyan
co,
cho
bi6t
hie,.,
sudt
truydn
cd
hoc
ld
n"o
-
94,32
(
1
di6m
)
c/
he
sd
c6ng
suAt
cosq(

0,5
didm
)
d/
moment
di6n
trl
cdc
dai
(
O,
5
di6m
)
86
qua
di€n
tr6
d6y
qtdn
phan
ang
vd.
c6.c
tdn
ha,o
do
ma
s6.t,
qru*t

si6.
(
p299)
2.
DQng
cokh6_ngddngbO:
pha
40
Hp(
1Hp
=
j46W
),.50
Hz,
460
v,
4
cr]c,
day
qudn
stato
n6i
y,
khi
lamvi6c
voi
tai
nhdt
dlnh,
c6

n

1447
v/ph-
Tdt
cd
cdc
t6n
hao
do
ma
sdt,
nrua
gio,
t6n
hao
phu,
o
di6u
kier.
tdi
noi
tr6n
la
670
w.
cac
th6ng
sd
cta

dOnq
cd
(
tinh
bangr
ohms
)
:
Ir=
0,1478,
r'2=
O,11OO,
rn
=2L2,73
Xr=
0,7273,
x'2=
O,'7248,
Xn
=2I,2J
r'uu
!
7d'
r.'2
,
x'2
7an
1aa!
ra.c6.c
di€n

trd,
diQn
khdng
tdn
ttl
d{y
qtdn
r6to
d6.
eui
d6i
v6
d6y
qudn
stato.
ta,
xo1
7an
Taqt
ra
diQn
Erd,
aiei
khdng
m4ch
fir
hoa
theo
kidu
md.c

song
song.
Tinh
,
d di6u
ki6n
tdi
noi
tr€n:
a/
tdng
trd
nhin
vao
dOng
co
(
O,
5
di6m
)
b/
dongr
dien
ddy
(0,
5
di6m
)
c/

c6ng
sudt
tac
dung, phan
khang,
bi6u
ki6n
ti6u
thu
do
dong
co,
h6
scj c6ng
sudt
(1
di6m
)
d/c6ng
sudr
di€n
ru
(1
di6m
)
e/moment
tr6n
truc
mdy
(1

di6m
)
(
p219
)
3- DQnq
co
1
chidu
kich
trr
song
song
co
czic
sd
1i6u
sau:
diet
6p
drnh
mrJc
U6,n
=
220
V,
di€n
tr-O
Oay
qudq

phA;
U;;
r r
=
0,4 {>,
ddng
ti6u
thU
dlnhmUc
f6*=
5Z
a,
Oie.,
t.o
6ay qudn
kich
trl
song
song
rkL
=
11oo
T6c
oo
r.r.i
dong
co
ctray
kh6ng
tai

1a
oo
=
1100
v/ph
Tlnh
:
a/
silc
dien
dOng.
phan
rrngr
luc
tdi
drnh
mric
(1
di6m
)
b/
L6c
d0
luc
tdi
drnh
mr-?c
(1
didm
)

c/
c6ng
sudt
di€n
trj
va
moment
die.,
tu
1ric
tdi
dinh
mr:c
(1
di6m
)
co
thd
b6
qua
ddng
diQn
ti6u
thq
crta
d6ng
co
ruc
kh6ngr
tei.

,{o
.R
eAt
rAp
rcEu rnl
mOn rirnuAr olEr,r
(
2e.08.2001)
'1.
Ddng
co khong
ddng bd roto ldng
s6c c6 Pdm
=
20 kW,
Udm= 380 V,
ddu
y,
ndm
=
88%, ndm
=
970 v/ph. Bidt ring:
lmm/ldm
=
4,5
i
Mmm/Mdm
=1,2
;

Mmax/Mdm
=
1,g.
a/ ldm, lmm,
sdm
b/
Mdm,
Mmm,
Mmax vA tdng tdn hao trong
ddng
cd
khi ldm
vi6c dinh mfc.
2.
Tdng
c6ng
sudt tdc dqng crla mdt nhd miiy
la P1
=
527 kW, cosrp
=
0,7.
Dd
k6o th6m
1.
tAi
ddng lUc
c6 c6ng sudt
P2
=

150 kW,
nha mdy
dDng 1 d6ng
co ddng b6. H6i
cOng
sudt S
c0a
d6ng cd ddng b0 d6 la bao nhi6u kVA
dd
k6o
drJdc tAi
d6ng hlc n6i tr6n,
ddng thdi
nAng
cosg c0a nha mdy 16n 0,9.
Cho biSt hi6u sudt c0a'dOng
cd ddng
bQ
la 11
=
0,87.
3. Mdy
bidn dp 3
pha
c6 cdc sd li6u
sau
:
Sdm
=
5600

kVA,
U1/U2
=
35000/6600 V, 11l12
=
92,51490 A, tdn hao
kh6ng tAi
po=
18,5 kW,
dong khOng
tAi
lo= 4,5"/o,
di6n
dp
ngSn
m4ch
urfir
=
7,5%,
cdng sudt ngSn mach
pflrT1=
57
kW, f
=
50 Hz,Yl-11. Tinh:
alcAc th6ng
sd
tf
c
kh6ng tAi

zo,
ro,
xo
blcdc thOng
s6lric
ngdn m4ch
znm, rnm, xnm
4. DOng
cd dien 1
chidu
kich tit song
song, c6ng sudt dinh mrlc Pdm
=
5,5 kW,
Udm
=
110
kw, ldm
=
58
A,
ndm
=
1470 vlph. Di6n trd
ddy
qudn phdn
fng ru
=
0,15 o
,

di6n trd mach
kich
trj
rkt
=
137o
,
di6n dp
rditren
cAc chdithan
AU
=2Y.
Tinh stlc
di6n ddng
phdn
rlng,
dong
phdn
rlng
vd
moment di6n tr]
.
eAr rAp
KIEM rRA MON rirnuflr
otEN
(
oe.2o01)
1. Ddng
cd
kh6ng

ddng
b6
r6to ldng
s6c c6 Pdm
=
20 kW,
Udm= 380 V,
ddu Y,
qdm
=
88%, ndm
=970v/ph.
Bidtring:lmm/ldm
=4,5;MmmiMdm
=1,2
i
Mmax/Mdm
=
1,8.
Tinh :
a/ ldm, lmm,
sdm
b/ Mdm, Mmm,
Mmax vd tdng tdn hao trong
ddng cd khi ldm
vi6c dinh
mfc.
2. Tdng
cdng sudt tdc dqrng cOa m6t nhd
mdy ld P1

=
527
kW, cos<p
=
0,7. Dd k6o
th6m 1
tAi
d6ng hJc co
cOng sudt
P2
=
150
kW, nhd mdy
ding 1
d6ng co ddng
b6. H6i c6ng
sudt S
c0a
ddng co ddng bg do la bao nhi6u kVA
dd k6o drldc-tai
ddng h-Ic n6i
tr6n, ddng
thoi
nA'ng cos<p
c0a
nhA
mdy l6n 0,9.
Cho bidt hieu sudt c0a
d6ng co
ddng b6 lir 11

=
e,g7.
3. May
biSn dp 3
pha
co
cdc sd li6u
sau
:
Sdm
=
5600 kVA,
U1iU2
=
35000/6600 V,
t1/12
=
92,51490 A,tdn hao
khdng
tAi
po=
18,5 kW,
dong
kh6ng
tAi lo= 4,5"/o,
di6n
6p
ngdn
mach
unrn

=
7,56/o,
cong'sudt ngin mqch
pnm=
57 kW, f
=
50 Hz,Yl-11.
Tinh:
al cAc
th6ng
sd lrlc kh6ng
tAi zo, ro, xo
bl cAc thdng sd hjc ngdn
mach znm, rnm, xnm
4. Ddng cd didn 1 chidu kich tr]
song song,
cdng
sudt dinh mrlc Pdm
=
5,5 kW, Udm
=
110
kW, ldm
=
58 A, ndm
=
1470 vlph.
Di6n
trd
dAy

qudn phdn
rlng ru
=
0,15 e
,
di6n trd m4ch
kich tii rkt
=
1
37Q
,
di6n 5p
rdi tren cdc chdi
than
AU
=
2 Y . Tinh
srrc di6n ddng
phdn
rtng,
dong
phdn
dng vi moment
di6n trl .
r!,
oE rnr ri
rnuAr olEru z
Thdi
gian
ldm

bdi
;90
phrit.
Sinh Vien
duqc
phep
s(t
dqng
titi
li6u.
1.
OEng
co m6t chidu kich tu
song song c6
cdc sd
li6u dlnh mfc sau :220Y,5,86
kW, 1500
v/ph.
Di6n trd dAy
qudn phdn
rlng ld, R6=
0,8 O
.
Di6n tr6 dAy
qudn
kich td la Rkt= 147
O
.
86
qua

hiQn
tUQng
phAn
fing
phAn
Ung.
Tdn hao kh6ng tAi
(
bao
gdm
tdn hao
sdt vir tdn thdt
cOng
sudt
co
hgc
)
ldr 653 W vd
kh6ng
thay ddi
theo t6c d6
quay
c0a
rOto.
a. Tinh moment
dinh mrlc M6p.
b.
Tinh dong
phdn
rlng dinh mtJc lu6m.

1
'
c. Tinh
di6n
trd md may
Rpnl mic ndi tidp trdn
mqrch
phdn
0ng sao cho khi
md mdy,
dong m6
mdy trong
phdn
r-?ng lumm
=
1
,3
ty67n
2.tVlay
ph6t
di6n
ddng
bO
3
pha,
cqc tr; dn,50 H2,60 MVA, 13.2 kV,
dAy
qudn
stato ndi
Y,

ldm vi6c song song
voi ltloi
di6n
phAn phdi
vd c0ng ldn c6 di6n ep
(day)
13,2
kV.
Di6n kh6ng
ddng b0 c0a
mdy
phdt
ddng
bd
ld x66
=
3.485 O .
Khi
cdng sudt
ra
ctja ddng
co so
cdp lA 50
MW, dong
kich trJ ip1 co
giA
tri 1000 A, h6
sd
c6ng sudt bdy
gio

cos(2
=
1,0.
GiA
s(J
m{y
phAt
d6ng bQ lAm
viQc
trong di6u kiQn mqch tU
kh6ng
bAo hda vd
b6
qua
tdt cA
cdc
tdn
hao
trong
mdy.
a.
Tfnh dong diQn
phdn
rlng
dinh
mric
lu6mve,
v5
mach
dien

tudng dUdng
cho m6y
phat
ndi
vdi
ludi di€n
b.
Khi c6ng sudt
tr6n r6to
c0a d6ng co
so cdp vAn ld 50 MW, tinh ddng kich ttl
cr/c
tidu iktmin
,
khi
d6
xAy
ra hi6n tuqng mdt
0dng
bd
cOa mAy ?
c. Tinh ddng
phdn
rlng
/atrJdng rlng
vdi
didu ki6n
lAm vi6c
cAu b/
3.

Ogng cd
kh6ng ddng
bd
3
pha,30
OOO HP
(
1 HP
=746
W
),
13,2
kV,60 Hz,
kidu
giAi
nhi6t
blng nudc-khdng
khi, k6o mdt mdy n6n turbine
t4i m6t nhir mdy s6n xudt
khioxygen.
DOng
cd
c6
tdc
dQ
dinh mrJc
1792,8 v/phtit,
sau
d6
qua

trung
gian
mdt h6p s6, toc
dd ndy
dugc tdng
thdnh
4930 v/phrit vA k6o m6y n6n khi.
D6ng co c6
hi6u sudt
1
dinh mfc
)
,tamOC
=
98,1"/",
he sd c6ng sudt
1
dinh mrjc
)
cosrp6^
=
0,90. Moment
m6 mdy
(
trr;c ti6p
)
Mn1,
=
O,TxMoment dinh mOc M6p, Dong
stato

m6 mdy
(trqc
tidp
)
lmm= 4,9xDong stato dinh miJc
16,77. Cho bi6t
hi6u
sudtc0a h6p
sdtrong
didu ki6n
ldm vi6c dinh mfc lit
ryanUS =
0.96.
Tinh
:
a. Dong stato dinh
mrlc
,
Moment dinh mtJc
(
tr6n truc d6ng co
)
,
Dong
stato m6 mdy,
Moment
md m6y
b.
Tdng tdn thdt cdng sudt
luc

d6ng
cd
k6o tai dinh mrlc, Tdn thdt cOng sudt trong
dAy
qudn
r6to ndu bidt tdn that do ma sAt vd
quat
gi6
lir 62
kW
c. Moment
ngay
tai
truc
vAo c0a mdy n6n khi
lr
DE
THt
H9C Kt
MON Kt THUAT D|FN
(
09.2001)
Thoi
gian
: 90
phrit.
SV drlsc
ph6p
srl
dgng

tiri liQu.
LUu
rj
!
: Bai 3 vi
bdi
4 la
biit buOc.
SV l{a
chgn 1
trong
2
bai cdn lai
(hoic
bai 1, ho{c bai
2).
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, tdn s6
50
Hz,
ddu Y, 6
crlc,
hO
sd c6ng sudt dinh mlrc
cosgdm
=
0,88, tdc dO
dinh muc ndm
=
980 v/ph.
(Tdn
hao
ddng
+ tdn hao
sdt statol ld2,2kw,
tdn hao
cd
(do
ma
sdt,
quat
gi6 )
la 1,1 kW,
khi d6ng

cd
lam vi6c
6 tai
dinh
mfc. Tinh,
luc ta-i
dinh
mfc:
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 ti6u thu
m6t c6ng sudt 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
sudt
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 60
Hz, 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
809
R,h4 dp
=
0,014
X,ha Ap
=
0,027 RM,
cao
6p
=
71 400
Mdy 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
=
95 kw, di6n
6p

dinh
mUc
Udm'-
220V,
dong ti6u thU dinh mrlc ldrn
=
470 A,
ddng kich trj dinh mfc 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
tr6 didu chinh Rdc
cdn
thidt mdc
ndi tidp tr6n
phdn
rrng dd O6ng
cd
quay
vdi n
=
ndm, lU
=
ludm vd trl th6ng
giAm
di40 %
(1
d).
ls