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CHNG 1: KHI NIM V H S CNG SUT
1.1.Khi nim chun.
Theo thng k cho thy 70% lng in nng sn xut ra c s !ng trongc"c x# nghi$ cng nghi$& T#nh chung trong to'n () h thng in* th+ng ,-0.-/% nng lng in $h"t ra (1 t2n tht trong 3u" tr4nh truy5n ti& T2n tht innng trong 6ng in c8 in "$ t9 ,0*-.-0k: ,t;c l' 6ng in x# nghi$ chi/% t2ng s t2n tht in nng ? trn :4 6ng in x# nghi$ th+ng @ng in "$tAng i th$ +ng By li 'i :' $hBn t"n&
Ci6 c t2n tht in nng t;c l' gi6 c thi
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1.!. H "# c$n "u%& c'"(.
1.!.1.Khi nim v h s cng sut cos.
H)nh 1.1: T*m ic c$n "u%&.
R s cng sut (iWu in 6i 3uan h giPa c"c ng cng sut cDa h thngin f* * ^ thng 3ua g8c lch $ha giPa in "$ :' Qng in* kM hiu cosS &
^ l' cng sut to'n $hJn& f cng sut t"c !ng& cng sut $hn kh"ng& S g8c giPa ^ :' f&Trong thHc t< t#nh to"n kh"i ni6 h s cng sutcosS c @ng& hi cosS c'ng nh th4 lng cngsut $hn kh"ng tiu th! hojc truy5n ti c'ng l=n :'cng sut t"c !ng c'ng nh :' ngc li&1.!.!. H "# c$n "u%& &+c &h,i.
' h s cng sut ti 6)t th+i iW6 n'o 8* o c nh+ !ng c! o cosShojc nh+ c"c !ng c! o cng sut* in "$ :' Qng in&
ll QP
P
S
PCos
+==
Uo $h! ti lun thay 2i nn cosS t;c th+i cLng lun thay 2i theo& I4 th< cosSt;c th+i khng c8 gi" tr1 trong t#nh to"n&
1.!.-. H "# c$n "u%& &un /)nh.
' h s cng sut trung (4nh trong 6)t khong th+i gian n'o 8 ,6)t ca l'6:ic* 6)t ng'y 6* 6)t th"ng&&& &
ll
tbtb
tb
QP
PCos
+=
Trong 8
2
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-l tt
AP Ptb
=
-l tt
AQ
Q
tb =
I=i a$* a3 l' lng in nng t"c !ng :' $hn kh"ng cDa c"c h) @ng in tiu th!
trong khong th+i gian t9 t-&/ 0&7/ -&0&m -&-[ 0&7[ 7&/[ 7&/[ -m&>
0& &m- 0&7 &[7 0&7 ->&mm
0& &>> 0&77 -0&[ 0&7 -&0>
0&- m m&[m 0&7> --&m 0&7- -[&7
1.!.=. > nh?* c@* 8ic nAn c*' h "# c$n "u%& c'"(.
Ci6 t2n tht cng sut $ trong 6ng in&
,,l
l
l
l
l
ll
QP PPRU
QR
U
PR
U
QPP +=+=
+=
hi gi6 c truy5n ti trn +ng By th4 sG gi6 c th'nh $hJn t2ntht cng sut o cng sut $hn kh"ng gBy ra f,&
Ci6 c t2n tht in "$ p trong 6ng&Ta V (i
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qh :\y khi gi6 c truy5n ti trn +ng By ,trong 6ng sG gi6 cth'nh $hJn t2n tht in "$ o cng sut $hn kh"ng gBy nn p ,&
Tng c kh nng truy5n ti cDa +ng By :' 6"y (i
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^ !ng h$ l# c"c thi
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{un nBng cao c hiu 3u truy5n )ng in* t#nh kinh t< cDa nng lngin cJn s !ng h
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H)nh !.1: &h /iWu XiYn 5u*n h c'"( Z [7B& t!Gc !i2n #ng v+ mL c,c cont"ctor t8ng Mng !2 s/ c;ng s%$t c !2thng thay 2i ,:=i sai s o i5u chnh t9ng (\c& FW i5u khiWn rAle 6"y (i
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khiWn& hi thHc hin (@ ch#nh x"c (]ng c"c gi" tr1 ti yu cJu sG tr"nh chin t8:ng 6%, i2n ,p k!i ti gim N%/ng t!$p v+ do # k!O b* c,c i'% ki2n
p!,t sin!6%, i2n ,p v+ tr,n! c,c t!i2t !i N< r" c!o tr"ng t!i5t b.
u" in "$ xut hin o hin tng (@ $h! thu)c 6)t $hJn :'o gi" tr1 t2ngtr? nguEn&X"c 3ui t`c (@
q
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o #ch th=c By c"$ i
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Ci" ti5n 6)t An :1 cng sut $h"t ra $h! thu)c :'o cng sut cDa 6"y (@*cng sut cDa 6"y (@ cLng ( th4 gi" ti5n - k:ar o n8 $h"t ra cLng `t& I4 :\y6"y (@ ch c ch< to :=i cng sut l=n th+ng / k:ar tr? ln&
X8 thW i5u chnh cng sut $hn kh"ng $h"t ra (]ng c"ch thay 2i k#ch t9 6)t
c"ch lin t!c&{"y (@ Eng () th+ng jt ? nhPng nAi cJn (@ t\$ trung* ung lng (@ l=n&
/. TP Jin &?nh.T! in tNnh l' loi thi
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qgo'i c"c thi
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CHNG -: HNG H 3 CNG SUT HoN KHNG p NDNGCEF H S CNG SUT
-.1. n q_n Kinh T] C@* C$n Su%& h4n Khn
Iic (@ cng sut $hn kh"ng sG a
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R) @ng in o 6"y $h"t in cung c$ kkt ,0*0. 0*0m&
R) @ng in 3ua - lJn (i
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( )b3b3
b3b3 QkRU
QQQP &&
&ll
=
( ) b3b3b3b3 QkQQ
U
RQP &&l
&l
= &
{un t46 (@tiu ta o h'6 fhAng tr4nh ,& theo (@:' cho (]ng khng*
ta c [ ] ( ) 0&l
ll
==
b3b3b3
b3
kQU
RQQ
U
R
Q
P
b3b3 kQU
RQ
U
R= &
l&
&l
ll
b3b3b3 kR
U
QkQU
R
R
U
Q &
&l&
l&
l
l
l
l
=
=(@ ti u b3
b3 kR
UQ
R
UkQR&
ll
&l ll=
q
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-.!.-. Tnh Xun \_n /e 7inh &].
Ta V (i
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( )0&&&l&&&,
0
l
0 =
+=
=
RU
QQTk""
dQ
di
dQ
di
b3b3tcv!
b3
b3
T9 8 gii ra ta c8( )
n
00l
-0&&&&l
&&&&
++=
R
PTk""UQQ b3b3tcv!b3
Trong (iWu th;c n'y
t#nh (]ng ,k:ar&
k(@t#nh (]ng ,:nk:ar&
l' ,:nkKh* u l' ,k: th4 (@l' ,k:ar&
-.!.0: Cc /L Bhbn c /4n c@* &hi]& / /e c$n "u%& Bh4n 7hn a&) tH )ng i5u chnh cng sut $hn kh"ng 3
) tH )ng i5u chnh cng sut $hn kh"ng c thi
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CHNG 0: HDN HI dUNG qrNG 3
0.1. hAn h#i T#i u dun q_n 3e T'n MQn qji s NhiB
0.1.1. V & Jk& &hi]& / /e.
^au khi t#nh c ung lng (@ :' chOn c loi thi
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Fjt t! ? thanh c"i in "$ th$ cDa tr6 (i
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( ) ( ) ( )nl
l
l-n
ll
l
ll
-l
l
--
&&& rU
QQQQrU
QQrU
QQP
dm
b3b3b3
m
b3
m
b3
++
+
+
=
Fi5u kin ti u l'
( ) ( )
( ) ( ) 0l&l
0&l&l
ll-nlll
l
nl-n---
-
=+++=
=+++=
rQQQQrQQQ
P
rQQQQrQQQ
P
b3b3b3b3
b3
b3b3b3b3
b3
T9 (iWu th;c trn ta thy( ) ( ) lll--- && rQQrQQ b3b3 =TAng tH ta c8 ,- (@-&r- , (@&rUo 8
-
l
--
l
-l--
l
-ll , b3b3b3 Q
r
rQ
r
rQQQ
r
rQQ +=
-
n
--
n
-n--
n
-nn , b3b3b3 Q
r
rQ
r
rQQQ
r
rQQ +=
Th< :'o $hAng tr4nh ,m&- ta c8
=++++ b3b3b3b3 QQr
rQ
r
rQQ
r
rQ
r
rQQ
-
n
l
-
n
-
n-
l
-
-
l
-
l-
( ) =
++++
++ b3b3 QQ
r
rQ
r
rQQQQ
r
r
r
rQ
-
n
-
-
l
-
nl-
n
-
l
-
- -
24
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=
+++
++ b3b3 Q
rrrrQQ
rrrrQ
nll
--
nll
--
---&
---&
+++=
++
nl
--
nll
--
-
l
--&
---&
rrrrQQQ
rrrrQ b3b3
( )t
b3
b3 rr
QQ &-
--
=
Trong 8nl-
---
-
rrr
rt++
=
TAng tH nh trn ta c8
( )t
b3
b3 rr
QQQQ &l
ll
=
( ) tb3b3 rrQQQQ &n
nn
=
25
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T2ng 3u"t
( )t
n
b3
nb3n rr
=
Trong 8
n
t
rrr
r-
&&&--
-
l-
+++=
=
=
n
i
iQQ-
l' t2ng cng sut $hn kh"ng cDa 6ng tr=c khi (@&
b3Q l' t2ng cng sut cJn (@ trong to'n 6ng&
q
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Fin tr? tAng Ang cDa c"c nh"nh
0-[m*00l*0
-
0>*0
-
0/*0
-
-*0
----- --
mnl-
=
+++=
+++=
rrrrrt 0,
Uung lng (@ cDa t9ng nh"nh
( ) n0n0-[m*0&-*0
-l00-700m00
- ==b36 ,k:ar
( )m0>0-[m*0&
0/*0
-l00-700>00
l =
=b36 ,k:ar
( )nna0-[m*0&
0>*0
-l00-700/00
n =
=b36 ,k:ar
( )-/n0-[m*0&
0l*0
-l00-700l00
m =
=b36 ,k:ar
0.1.-. hAn Bh#i \_n /e &'n mQn BhAn nhnh.t 6)t 6ng $hBn nh"nh nh h4nh :G ,h4nh m&* c8 thW coi l' nhi5u 6ng
h4nh tia gh$ li&
H)nh 0.-: S J BhAn /# Xun \_n /e &h^' mQn BhAn nhnh
I# ! ti iW6 * c8 thW coi nh c8 nh"nh h4nh tia r :' rmgh$ li* ti iW6 ta coinh c8 nh"nh h4nh tia&
{)t nh"nh l' r:' 6)t nh"nh nPa in tr? tAng Ang cDa $hJn $h#a sau* t;cl' r* rm :' r* kM hiu l' r/&
mn
mnln/
&
rr
rrrr
++=
Ti iW6 - ta coi nh c8 nh"nh r-:' r>:=i
/l
/l-l>
rr
rrrr
++=
27
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I=i 3uan ni6 nh :\y chYng ta c8 thW "$ !ng cng th;c cDa 6ng h4nh tiacho 6ng $hBn nh"nh&
Uung lng (@ cDa nh"nh th; n c t#nh nh sau
tdn
nb3n
nb3n rr
QQQQ &
m
-,-, =
Trong 8
nl' cng sut $hn kh"ng cDa nh"nh n&
0-, nQ l' t2ng cng sut $hn kh"ng cung c$ cho iW6 ,n-&
0-, nb3Q l' t2ng ung lng (@ cho iW6 ,n-&
rtnl' in tr? tAng Ang cDa 6ng kW t9 iW6 ,n- tr? :5 sauI# !Xho 6ng in $hBn x?ng nh ,h4nh m&m
H)nh 0.0: MQn Jin BhAn nhnh
T2ng ung lng (@ l' 00 k:ar* hVy t#nh ung lng (@ ti u cho t9ngnh"nh&
q
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00a-*00l/*00-l*0
0l/*0&0-l*0&
mn
mnn =
+=
+=
rr
rrrt 0,
( )00ma*0
00m*000a-*000a*0
00m*000a-*0&,00a*0&
lnnl
lnnll =
++
+=
++
+=
rrr
rrrr
t
tt 0,
00m[/*000/*0&00ma*0&0-0*0
00/*000ma*0&,0-0*0&,
l-l-
l-l-- =
+=+++=
rrr
rrrr
t
tt 0,
29
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Uung lng (@ ti u cho t9ng nh"nh
/-0-*0
00m[/*0&n00/00,-/0- =
=b3Q k:ar
m0
00a*0
00ma*0&lm[n/0,-00l =
=b3Q k:ar
-7l0-l*0
00a-*0&l0[l/0,l00n =
=b3Q k:ar
n70l/*0
00a-*0&l0[l/0,/0m =
=b3Q k:ar
XhY M in tr? tAng Ang rtt#nh t9 cui ln* cQn t#nh ung lng (@ t9 Ju
T#nh in tr? tAng Ang cDa t9ng nh"nh nh ,h4nh m&>(* khi 8 coi 6ngin l' h4nh tia :' $hBn $hi cng sut theo 6ng h4nh tia&
30
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H)nh 0.t: S J hwn h_B
Trong 8Fin tr? tAng Ang nh"nh - rt-t#nh nh 6ng $hBn nh"nh c8 +ng By rGnh"nh&
Fin tr? tAng Ang nh"nh rtl' 6ng $hBn nh"nh khng c8 +ng By rGnh"nh* o 8 in tr? tAng Ang cDa nh"nh c x"c 1nh theo (iWu th;c sau
l
-ln
-
l
-ln-l
l
lnln
l
n
,
&,&,&
QQQ
rQQQrQQrQr ht
++
+++++=
T2ng 3u"t
=
=
= n
j
j
n
i
ii
t
Q
rQ
r
-
l
-
l
,
&
Trong 8
il' cng sut $hn kh"ng :' in tr? cDa +ng By i&
l' cng sut $hn kh"ng cDa $h! ti &Fin tr? tAng Ang nh"nh rtl' 6ng c8 - $h! ti&"c 1nh 3(uinh :=i 6ng in h4nh tia* khi V c8 3(uita $hBn $hi cng sut
(@ trong c"c nh"nh nh sau
qh"nh - l' +ng By $hBn nh"nh c8 +ng By rG nh"nh& qh"nh l' +ng By $hBn nh"nh khng c8 nh"nh rG&
qh"nh l' +ng By c8 - $h! ti&
0.1.t. hAn Bh#i Xun \_n /e Bh* " c%B 89 &h+ c%B m /i]n B BhAn xgn.
In 5 jt ra l' khi V t#nh c ung lng (@ cDa 6)t nh"nh n'o 8* cJn$hi x"c 1nh xe6 nn $hBn $hi lng (@ :5 $h#a sA c$ hay th; c$ cDa 6"y (i
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c t2n tht cng sut so :=i :ic jt t! in ? $h#a in "$ cao& I4 :\y cJn t#nh to"nso s"nh W t46 c ung lng (@ ? $h#a in "$ th$ h$ l# nht&
COi 3(@ th$l' ung lng (@ ? $h#a in "$ th$* :n Ju t W jt ung lng(@ 3(@ th$? $h#a in "$ th$ l=n hAn :n Ju t W jt 6)t ung lng (@ tAng tH ?
$h#a in "$ cao l': ,ath$z acao&3(@ th$
Trong 8
acaol' gi" th'nh - k:ar t! in in "$ cao ,k:ar&
ath$l' gi" th'nh - k:ar t! in in "$ th$ ,k:ar&^ ti5n ti0 gi+& p in "$ 1nh 6;c $h#a in "$th$ cDa 6"y (i
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Thng th+ng cha (i
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(@l' cng sut $hn kh"ng t! $h"t ra ,:ar&
H)nh 0.z: S J &P /e J%u h)nh &*m ic.
0.!.!TP Jin n#i &h^' h)nh "*' {.
uan h Qng :' "$p n p b Uung lng $h"t ra cDa t!
l&&&l&n
&n
&n&&n dc
ddffb3 UCf
X
UUIUQ === ,:ar
Uung lng cDa t!
l&&l d
b3
Uf
QC
= ,
H)nh 0.|: S J &P /e J%u "*'
^o s"nh hai (iu th;c t! in ni theo h4nh ta6 gi"c :' t! in ni theo h4nhsao ta thy c@ng 6)t ung lng (@* t! in ni theo h4nh ta6 gi"c th4 in ung cDat! nh hAn lJn so :=i t! in ni theo h4nh sao&
0.-. S J n#i XA 89 Jin &g Bhn Jin.
^A E ni By cDa t! in in "$ cao c tr4nh ('y trn ,h4nh m&7* :4 t! inin "$ cao l' loi - $ha nn chYng c ni li :=i nhau th'nh h4nh ta6 gi"c* 6i
34
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$ha c8 cJu ch4 (o : ring& hi cJu ch4 6)t $ha n'o 8 (1 ;t* t! in cDa hai $hacQn li :_n ti
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H)nh 0.1: S J n#i XA c@* &P H)nh 0.11: S J n#i XA c@* &P JinJin Jin B c*' Jin B &h%B
Thi
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Fin tr? $h8ng in cDa t! in $hi tho 6Vn c"c yu cJu sau By
Ci6 nhanh in "$ trn t! in W 6 (o an to'n cho ng+i :\n h'nh*ng+i ta 3uy 1nh sau 0 $hYt in "$ trn t! in $hi gi6 xung =i >/:&
trng th"i l'6 :ic (4nh th+ng t2n tht cng sut t"c !ng trn in tr?$h8ng in so :=i ung lng cDa t! in khng :t 3u" tr1 s -Kk:ar&
UQng $h8ng in khng c l=n 3u"&Fin tr? $h8ng in c t#nh theo cng th;c sau By
Q
UR
f
pd
l
>-0&-/= 0,
Trong 8
l' ung lng cDa t! in ,k:ar&
pl' in "$ $ha cDa 6ng&FW c8 thW sn s'ng l'6 :ic ngay sau khi t! in c c`t ra khi 6ng* intr? $h8ng in $hi c ni $h#a =i c"c thi
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CHNG =: CHN V VN HNH T IN
=.1.q* chn 89 hiu chnh Xun \_n /e.=.1.1.Chn &P Jin.
XhD y
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Fi5u chnh tH )ng ung lng (@ theo $h! ti* c @ng trong tr+ng h$$h! ti (i
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6;c nn trong thHc t< ung lng cDa t! in th+ng nh hAn ung lng 1nh6;c ghi trn (iWn 6"y l' -0%&Trong :\n h'nh n
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& qh86 XF kiW6 tra* theo i c8 ch;c nng kiW6 tra :' theo i sHl'6 :ic cDa i tng :' (i
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X"c yu cJu :5 cng ngh ch< to&
t.0.1. Cc 2u cu 8O 7 &hub&
F) (5n nhit cDa c"c chi ti
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in (]ng tay nhng c8 thW tH )ng ng`t 6ch in khi c8 sH c 3u" ti hojc ng`n6ch&
H)nh t.1: Cc \'Qi C3 1 Bh* 89 - Bh*
*< hAn \'Qi
Th^' c c%u &c JLn & n&< n,i &* chi* * /* \'Qi "*u }$ t 6"t nhit t"c )ng nh+ cA cu innhit* nh :\y th+i gian t"c )ng sG
rt ch\6& oi n'y th+ng @ng W (o : 3u" ti& }$ t 6"t in t9 t"c )ng nh+ cA cu int9* nh :\y th+i gian t"c )ng sG
rt nhanh& oi n'y th+ng @ng W (o : ng`n 6ch& }$ t 6"t in t9nhit
Th^' c c%u n,i &* chi* * cc \'Qi "*u }$ t 6"t - cHc
}$ t 6"t cHc& }$ t 6"t cHc&
43
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Th^' Jin B "a XPn n,i &* chi* * cc \'Qi "*u }$ t 6"t - $ha ,c8 - hojc cHc& }$ t 6"t $ha ,c8 cHc&
Th^' c$n XPn n,i &* chi* * cc \'Qi "*u
}$ t 6"t Qng cHc i& }$ t 6"t in "$ th$& }$ t 6"t chng gi\t& }$ t 6"t a nng&
/< Ch+c nn
X l' cng t`c hojc cJu ao tH )ng c8 nhi6 :! (o : chng ng`n 6ch hay3u" ti t;c l' (o : chng 3u" nhit hay trong tr+ng h$ hng h8c thi
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X $hi ng`t c tr1 s Qng in ng`n 6ch l=n* c8 thW
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^
8/12/2019 HON THIN N
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hi 8ng 6?* c8 6)t khong th+i gian ti
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ki6 nhit :' na6 chB6 cu)n By in t9& u" tr4nh t"c )ng khi c8 sH c 3u" Qng o3u" ti hay ng`n 6ch* t"c )ng (]ng lng ki6 nhit :' na6 chB6 in t9 ctr4nh ('y trn h4nh ,&[
H)nh t.0. C%u &Q' c@* mc /4' 8
H)nh t.=. u &)nh &c JLn /Rn \n 7im nhi& 89 cuLn XA Jin &
48
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Cc c c%u 5u*n &n 7hcC c%u Jn n&
XA cu 8ng ng`t $hi c thi
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[
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*< hAn \'Qi
H)nh t.t. C'n&*c&' 7iWu Jin &
Xontactor h "$ th+ng @ng kiWu khng kh#* $hBn ra nhi5u loi nh sau
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Theo Qng in* c8 contactor in 6)t chi5u :' contactor in xoay chi5u&
Theo kiWu k
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MQch & X"c li th$ c8 h4nh ng chP hojc chP * n8 gE6 c8 nhPng l"tn sil#c* c8 chi5u Jy 0*/ 66 hojc 0*/ 66* gh$ li W tr"nh t2n hao Qng inxo"y oucault& {ch t9 th+ng chia l'6 hai $hJn 6)t $hJn c k$ chjt c 1nh,$hJn tNnh* $hJn cQn li l' n`$ ,cQn gOi l' $hJn ;ng hay $hJn )ng c ni :=i
h thng ti nn lQ xo (1 nn li Eng th+i thanh truy5n )ng sG ko ti
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l' contactor in 6)t chi5u hJu h
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H)nh t.|. \^ &un i*n
fhBn loi theo nguyn lM l'6 :ic gE6 c8 rAle in t9* rAle in )ng* rAle
t9 in ,{anht* rAle c6 ;ng* rAle nhit* rAle in t* rAle ("n _n fhBn loi theo i lng in i :'o rAle gE6 c8 rAle Qng in* rAle in
"$* rAle cng sut* rAle t2ng tr?* rAle tJn s* rAle lch $ha&
fhBn loi theo Qng in gE6 c8 rAle Qng in 6)t chi5u :' rAle Qngin xoay chi5u&
fhBn loi theo gi" tr1 :' chi5u cDa i lng i :'o rAle gE6 c8 rAle cHci* rAle cHc tiWu* rAle cHc i z cHc tiWu* rAle sai lch* rAle h=ng .
*< C%u &Q' 89 nu2n \ \9m 8ic
H)nh t.}. C%u &Q' c@* \^ &un i*n
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& Xu)n By hYt&
& fhJn )ng ,$hJn ;ng&
m& Q xo c 1nh&
/& R thng ti
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H)nh t.1. S J /i]n Xn
Ti cDa (i
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i
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t.=.0.~n /' Bh*.
R4nh >&--&Fn ("o
t.=.=.n h hiWn &h V'n.
59
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R4nh >&-&&FEng hE hiWn th1 :on
t.=.t.n h hiWn &h EmB^.
60
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H)nh t.1-.$n h hiWn &h *mB^
t.=.z.3 iOu KhiWn 3e lt Hjn dn Sa dPn
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H)nh t.10.3L JiOu 7hiWn t
R4nh >&-/&^A E u ni () i5u khiWnM$ &4 h'Q& JLn:
62
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hi c c$ in* () i5u khiWn sG hot )ng ? ch< ) tH )ng& {'n h4nh sGhin th1 tr1 s cosS cDa $h! ti hojc hiWn th1 q ' C ,:i
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qgng 8ng E thng sE x"c 1nh ngng 8ng cDa () i5u khiWn& XhOn -trong gi" tr1 theo (ng sau
E l 1 qgng 8ng cosS .|= c4m
E l ! qgng 8ng cosS .} c4m
E l - qgng 8ng cosS .}= c4m
qgng c`t / thng s/ x"c 1nh ngng c`t cDa () i5u khiWn& XhOn - trong gi" tr1 theo (ng sau
/ 1 qgng c`t cosS .}= c4m
/ ! qgng c`t cosS 1.
/ - qgng c`t cosS .}= Xung
Th+i gian 8ng C thng sC x"c 1nh th+i gian tr khi 8ng cDa () i5ukhiWn& XhOn - trong m gi" tr1 theo (ng sau
C 1 Th+i gian 8ng =giBy
C ! Th+i gian 8ng 1 giBy
C - Th+i gian 8ng !giBy
C l 0 Th+i gian 8ng 0 giBy
Th+i gian c`t X: thng sX x"c 1nh th+i gian tr khi c`t cDa () i5u khiWn&XhOn - trong m gi" tr1 theo (ng sau
X 1 Th+i gian c`t -giBy
X ! Th+i gian c`t tgiBy
X - Th+i gian c`t }giBy
64
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X 0 Th+i gian c`t 1!giBy
qgng (o : 3u" "$ thng s x"c 1nh ngng (o : 3u" "$ cDa ()
i5u khiWn& XhOn - trong m gi" tr1 theo (ng sau
1 qgng 3u" "$ !-=I
! qgng 3u" "$ !0I
- qgng 3u" "$ !0=I
0 qgng 3u" "$ !=I
^ c$ hot )ng thng s x"c 1nh s lng c"c c$ cho $h$ hot )ng cDa() i5u khiWn& XhOn - trong m gi tr1 theo (ng sau
^au khi V chOn c"c gi" tr1 c'i jt* nhn nYt M'X^'. khong - giBy* () i5ukhiWn sG ra khi ch< ) l\$ tr4nh :' lu c"c gi" tr1 c'i jt 6=i :'o () nh=& FBy l' loinon z :olatile z 6e6ory khng (1 6t n)i ung @ cho nguEn in (1 ng`t&
65
1 ^ c$ -
1 ^ c$ 0
1 ^ c$ =
1 ^ c$ t
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^. Cc Jkc &n 7 &hub& chnh:
34n t.1: Th$n "# 7 &hub& c@* /L JiOu 7hiWn /e
Fin "$ hot )ng wX0I -/%* m/ >/ RXng sut tiu th! -0Iw
uy c"ch cJu ch4 5 ngh1 /0I* w* c8 th+i gian tr& `$ ngo'i&
uy c"ch 6"y (i
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qYt nhn c H ki
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6ch in i5u khiWn* t#n hiu* lin )ng* (o :| ? 6ch in 6)t chi5u in "$
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t.t.1. Cu ch).
XJu ch4 l' 6)t loi kh# c! in @ng W (o : thi
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Iic thay th< cJu ch4 (1 ch"y $hi 'ng :' tn #t th+i gian& *< C%u &Q' 89 nu2n \ h'Q& JLn.
Xu to
fhJn t ng`t 6ch By ch#nh l' $hJn ch#nh cDa cJu ch4* $hJn t n'y $hi
c8 kh nng c6 nh\n c gi" tr1 hiu !ng cDa Qng in 3ua n8& fhJn tn'y c8 gi" tr1 in tr? sut ( ,th+ng (]ng (c* Eng hay c"c :\t liu _nc8 gi" tr1 in tr? sut nh lBn c\n :=i c"c gi" tr1 nu trn|& R4nh ng cDa
$hJn t c8 thW ? ng l' 6)t By ,ti
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c. Tnh ton dung lng t:
Ta o Qng in l' &> w
Fin "$ 1nh 6;c l' 0I
T9 c"c s liu trn ta chOn c c"c kh# c! in nh sau1.1Chn CB:1.1.1 Chn CB tng:
iWu ^
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q &/ ,kw
^ lng c"i1.1.2 Chn CB ng ct cc c t!:
iWu ^6 -0 ,w
p6 /0 ,I
q &/ ,kw
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iWu ^
p6 m0 ,I
6 m,w^ lng > c"i
1.$ %&nh ton 'ung ()*ng t!:Fu t! theo h4nh R s cng sut tr=c khi (@ - 0&mCos = v tan - &-> =
R s cng sut cDa ti sau khi (@ 6ong 6un l' cos 0&/ = v tan 0&>-[ =
UQng in o c -*77/w
Xng sut cDa t2ng ti & &t"i d d P U I Cos=
0 -&77/ 0&m m[0&>7 =
,0&m[0>7,I\y t2ng cng sut $hn kh"ng cJn (@ trn $ha l'
n&,tan - tan
b% p!" t"iQ P =
0&m[0>7&,&->0&>-[0&7/> ,Iwr
Xng sut $hn kh"ng - $ha l' (@ - $ha 0&7/>
0&/,
b% p!"l@Ar= =
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->*/7,
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= =
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I4 t! u nn X-tu->*/7
*7, >
=
Trong thHc t< ung lng t! khng (]ng ung lng ghi trn nhVn :' khng c8 t!c8 ung lng nh t#nh to"n* nn ta c8 thW chOn t! l=n hAn - #t
I\y ta chOn > c$
t.z:MQch JiOu 7hiWn 89 JLn \c c@* &@ &P /e t c%B c$n "u%& !78*
72
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t.|. S J J%u n#i &hi]& / &'n m$ h)nh
t.}: S J /# & &hi]& / mk& n'9i c@* &@
73
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74
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t.1:S J /# & &hi]& / mk& &'n c@* &@
t.11:H)nh 4nh &@ &P &P /e t c%B c$n "u%& !78*
75
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t.1!:S J /# &i hLB ch+* &P /e
76
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t.1-:H)nh 4nh &hc &] c@* hLB ch+* &P /e
t.10.H)nh 4nh &hi c$n 89 \B Jk& &@ &P /e
77
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78
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79
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80
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