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7/31/2019 bi tp di h thng cung cp in
1/31
Hv tn: o Vit Dng
Lp: K&TH3-K54
SHSV: 20090504
s 3, mt bng nh my s 9, PX SCCK s 6( S th t: 27).
Bi tp ln h thng cung cp in
NHIM V THIT K H THNG CUNG CP IN
I. U THIT K.Thit k cung cp in cho 1 nh my.
II. CC S LIU BAN U.1. Ph ti in ca nh my ( hnh 1 v bng 1)2. Ph ti in ca phn xng sa cha c kh ( hnh 2 v bng 2)3. in p ngun : .4. Dung lng ngn mch v pha h p ca trm bin p khu vc : 250MVA5. ng dy cung cp in cho nh my : Dng dy nhm li thp (AC) t
treo trn khng.6. Khong cch t ngun n nh my : 15km.7. Cng sut ca ngun in : v cng ln.8. Nh my lm vic : 3 ca, Tmax = 4000 gi
III. NI DUNG CC PHN THUYT MINH V TNH TON.1. Xc nh ph ti tnh ton ca phn xng sa cha c kh v ton nh
my.
a. Xc nh ph ti tnh ton ca phn xng sa cha c kh.Ta xc nh ph ti tnh ton ca tng nhm b phn thit b .
Cn c vo v tr, cng sut ca my mc c b tr trn mt bng phnxng sa cha c kh ta c th chia ra lm 5 nhm ph ti.
7/31/2019 bi tp di h thng cung cp in
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Tnh ton cho nhm 1.V ph ti cho bit kh nhiu thng tin, nn ta quyt nh xc nh ph ti tnh
ton theo cng sut trung bnh v h s cc i. Tra cu trong bng s tay k thut ta
c: v .S liu ph ti nhm 1 c cho trong bng di y.Bng 1: s liu ph ti nhm 1.
STT Tn thit b Khiutrns
Slng
Nhnmy
Pm(kW) Hssdng
1my
Tonb
1 Ba hi rn 2 2 M-415A 28 56 0,17 0,55/1,532 L rn 3 1 4,5 4,5 0,17 0,55/1,533 My p ma st 8 1 A124 10 10 0,17 0,55/1,534 L in 9 1 H-15 15 15 0,17 0,55/1,535 Dm treo c pa-
lng in11 1 4,8 4,8 0,17 0,55/1,53
6 Qut ly tm 13 1 BN8 7 7 0,17 0,55/1,537 My bin p 17 2 2,2 4,4 0,17 0,55/1,53
Dng phng php thit b hiu qu tnh ph ti tnh ton ca nhm 1:
Ta c:
T v tra bng ta c : , suy ra .
7/31/2019 bi tp di h thng cung cp in
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Tra bng vi v ta c .Ph ti tnh ton nhm 1:
Tnh ton cho nhm 2:Ta c:
T v tra bng ta c : , suy ra .Tra bng vi v ta c .Ph ti tnh ton nhm 2:
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Tnh ton cho nhm 3:Ta c:
T v tra bng ta c : , suy ra .Tra bng vi v ta c .Ph ti tnh ton nhm 3:
Tnh ton cho nhm 5:Ta c:
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T v tra bng ta c : , suy ra .Tra bng vi v ta c .Ph ti tnh ton nhm 5:
Ring vi nhm 4 ch c 3 thit b ( ) v s thit b hiu qu nn ta tnh ph ti tnh ton trc tip bng cng thc:
H s cng sut trung bnh ca c nhm:
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Ta c kt qu trong bng 2 di y:
Bng 2: Ph ti in ca phn xng SCCK.
Tn nhm v thitbin
Khiutrn
s
Slng
Pm(kW)
Hssdng
Sthitbhiuqu
Ph ti tnh ton
1my
Tonb
1 2 3 4 5 6 7 8 9 10 11 12Nhm 1Ba hi rn 2 2 28 56 0,17 0,55/1,53L rn 3 1 4,5 4,5 0,17 0,55/1,53My p ma st 8 1 10 10 0,17 0,55/1,53L in 9 1 15 15 0,17 0,55/1,53D m treo c pa-lng in 11 1 4,8 4,8 0,17 0,55/1,53Qut ly tm 13 1 7 7 0,17 0,55/1,53My bin p 17 2 2,2 4,4 0,17 0,55/1,53Cng theo nhm
1
9 101,7 0,17 0,55/1,53 6 45,64 69,83 82,98 12
Nhm 2
Ba hi rn 1 2 10 20 0,17 0,55/1,53L rn 3 1 4,5 4,5 0,17 0,55/1,53Qut l 5 1 2,8 2,8 0,17 0,55/1,53Qut thng gi 6 1 2,5 2,5 0,17 0,55/1,53My mi s c 12 1 3,2 3,2 0,17 0,55/1,53Cng theo nhm
2
6 33 0,17 0,55/1,53 4 17,45 26,70 31,73 48
Nhm 3
L in 18 1 30 30 0,17 0,55/1,53L in hacng linh kin
19 1 90 90 0,17 0,55/1,53
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L in 20 1 30 30 0,17 0,55/1,53L in rn 21 1 36 36 0,17 0,55/1,53L in 22 1 20 20 0,17 0,55/1,53L in 23 1 20 20 0,17 0,55/1,53B du 24 1 4 4 0,17 0,55/1,53Thit b ti bnhrng
25 1 18 18 0,17 0,55/1,53B du tng nhit
26 1 3 3 0,17 0,55/1,53My o cngu cn
28 1 0,6 0,6 0,17 0,55/1,53My mi sc 31 1 0,25 0,25 0,17 0,55/1,53C n trc c pa-lng in
33 1 1,3 1,3 0,17 0,55/1,53Cng theo nhm3
12 253,15 0,17 0,55/1,53 6 113,61 173,82 206,56 31
Nhm 4Thit b cao tn 34 1 80 80 0,17 0,7/1,01Thit bo bi 37 1 23 23 0,17 0,55/1,53My nn kh 40 1 45 45 0,17 0,75/0,88Cng theo nhm
4
3 148 0,69/1,04 2 148 153,92 214,49 32
Nhm 5
My bo g 41 1 6,5 6,5 0,17 0,55/1,53My khoan 42 1 4,2 4,2 0,17 0,55/1,53My cu ai 44 1 4,5 4,5 0,17 0,55/1,53My bo g 46 1 10 10 0,17 0,55/1,53My cu trn 47 1 7 7 0,17 0,55/1,53Qut gi trunggian
48 1 9 9 0,17 0,55/1,53Qut gia s 9,5 49 1 12 12 0,17 0,55/1,53Qut s 14 50 1 18 18 0,17 0,55/1,53Cng theo nhm5
8 71,2 0,17 0,55/1,53 7 30,02 45,93 54,58 82
Tnh ph ti chiu sng ca phn xng SCCK:Din tch ca phn xng l
.
Sut ph ti chiu sng .Vy ph ti chiu sng ca phn xng l: Ph ti ng lc ca phn xng:
7/31/2019 bi tp di h thng cung cp in
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Tra bng ta c h s nhu cu ca phn xng l , suy ra cngsut t caphn xng l:
Ph ti tc dng ca phn xng:
Ph ti phn khng ca phn xng: Ph ti ton phn ca phn xng:
b. Xc nh ph ti tnh ton ca ton nh my.V cc phn xng ch bit cng sut t, nn ph ti tnh ton c xcnh theo cng sut t v h s nhu cu.
Phn xng tin c kh:Din tch phn xng l Tra bng c v . Sut chiu sng . T ta tnh c :- Cng sut tnh ton ng lc:
- Cng sut tnh ton chiu sng: - Cng sut tnh ton tc dng ca phn xng:
7/31/2019 bi tp di h thng cung cp in
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- Cng sut tnh ton phn khng ca phn xng: - Cng sut tnh ton ton phn ca phn xng:
Phn xng dp:
Din tch phn xng l Tra bng c v . Sut chiu sng . T ta tnh c :- Cng sut tnh ton ng lc:
- Cng sut tnh ton chiu sng: - Cng sut tnh ton tc dng ca phn xng: - Cng sut tnh ton phn khng ca phn xng: - Cng sut tnh ton ton phn ca phn xng:
Phn xng lp rp s 1:
Din tch phn xng l Tra bng c v . Sut ph ti chiu sng . T ta tnh c :- Cng sut tnh ton ng lc:
- Cng sut tnh ton chiu sng: - Cng sut tnh ton tc dng ca phn xng: - Cng sut tnh ton phn khng ca phn xng:
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- Cng sut tnh ton ton phn ca phn xng:
Phn xng lp rp s 2:Din tch phn xng l Tra bng c v . Sut ph ti chiu sng . T ta tnh c :- Cng sut tnh ton ng lc: - Cng sut tnh ton chiu sng:
- Cng sut tnh ton tc dng ca phn xng: - Cng sut tnh ton phn khng ca phn xng: - Cng sut tnh ton ton phn ca phn xng:
Phng th nghim trung tm:
Din tch phng l Tra bng c v . Sut ph ti chiu sng . T ta tnh c :- Cng sut tnh ton ng lc: - Cng sut tnh ton chiu sng:
- Cng sut tnh ton tc dng ca phng: - Cng sut tnh ton phn khng ca phng: - Cng sut tnh ton ton phn ca phng:
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Phng kim nh th nghim:
Din tch phng l Tra bng c v . Sut ph ti chiu sng . T ta tnh c :- Cng sut tnh ton ng lc: - Cng sut tnh ton chiu sng: - Cng sut tnh ton tc dng ca phng:
- Cng sut tnh ton phn khng ca phng: - Cng sut tnh ton ton phn ca phng:
Trm bm:
Din tch trm bm l
Tra bng c v . Sut ph ti chiu sng . T ta tnh c :- Cng sut tnh ton ng lc: - Cng sut tnh ton chiu sng: - Cng sut tnh ton tc dng ca trm bm:
- Cng sut tnh ton phn khng ca trm bm: - Cng sut tnh ton ton phn ca trm bm:
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Phng thit k:Din tch phng l Tra bng c v . Sut ph ti chiu sng
. T ta tnh c :
- Cng sut tnh ton ng lc: - Cng sut tnh ton chiu sng: - Cng sut tnh ton tc dng ca phng: - Cng sut tnh ton phn khng ca phng:
- Cng sut tnh ton ton phn ca phng:
Ta c bng ph ti tnh ton ca tng phn xng:
TT
Tnphnxng
1 Phnxng(PX)tin ckh
2 PXdp
3 PX lp
rp s1
4 PX lprp s2
5 PX
sa
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chac kh
6 Phngth
nghimtrungtm
7 Phngkimnhthnghim
8 Trmbm
9 Phngthitk
Ph ti tnh ton tc dng ton nh my:
Ph ti tnh ton phn khng ton nh my:
Ph ti tnh ton ton phn ton nh my:
H s cng sut ca nh my:
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Xc nh biu ph ti:Chn t l xch , t tm c bn knh ca biu phti:
Gc ca ph ti chiu sng nm trong biu ph ti c xc nh theobiu thc sau:
Kt qu tnh ton v ca biu ph ti ca cc phn xng chotrong bng 3.Bng 4: Bn knh R gc chiu sng ca biu ph ti ca cc PXTT Tn phn
xng
1 Phn xngtin c kh
2 PX dp 3 PX lp rp s
1
4 PX lp rp s2 5 PX sa chac kh
6 Phng th
nghim trungtm
7 Phng kim
nh thnghim
8 Trm bm 9 Phng thit k Biu ph ti ca ton nh my c vtrn hnh di y:
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2. Thit k mng cao p cho ton nh my. phn trc ta tnh c cng sut ton nh my l . Vi cng sut nh vy nn t trm phn phi trungtm(PPTT) nhn in t trm bin p trung gian(BATG) v ri phn phicho cc trm bin p phn xng(BAPX).a. Xc nh v tr tm PPTT.
Trn s nh my, v 1 h trc ta xOy, vy trng tm ph ti canh my c xc nh theo ta M(x,y) nh sau:
Dch chuyn ra khong trng, vy chn v tr ca trm PPTT l v trM(;).
b. Xc nh v tr, slng, dung lng cho cc trm BAPX.Cn c vo v tr, cng sut ca cc phn xng, ta quyt nh t 6trm BAPX:
- Trm B1 cp in cho PX tin c kh.-
Trm B2 cp in cho PX dp.- Trm B3 cp in cho PX lp rp s 1 v phng th nghim trung tm.- Trm B4 cp in cho PX lp rp s 2.- Trm B5 cp in cho PX sa cha c kh v phng thit k.- Trm B6 cp in cho trm bm v phng kim nh th nghim v
trm bm.Trong cc trm B1, B2, B3, B4 v B6 u cp in cho cc ph tiloi 1 nn cn t 2 my bin p. Trm B5 cp in cho ph ti loi 3ch cn t 1 my. Cc trm dng loi trm k, c 1 tng trm chungvi tng phn xng. Cc my bin p dng my do ABB sn xut tiVit Nam, khng phi hiu chnh nhit .
Chn dung lng cc my bin p:- Trm B1: t 2 my bin p lm vic song song.
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Vi , ta xc nh dung lng ca 1my bin p theo cng thcl:
Chn my bin p tiu chun ca ABB l .Vi trm bin p t 2 my lm vic song song th cng sut mi myphi m bo iu kin kim tra s c.Kim tra iu kin qu ti s c, chn
:
Vy trm bin p B1 t 2 my , .- Trm B2: t 2 my bin p lm vic song song.
Vi , ta xc nh dung lng ca 1my bin p theo cng thcl:
Chn my bin p tiu chun ca ABB l .Vi trm bin p t 2 my lm vic song song th cng sut mi myphi m bo iu kin kim tra s c.Kim tra iu kin qu ti s c, chn :
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Vy trm bin p B2 t 2 my , .- Trm B3: t 2 my bin p lm vic song song.Vi , ta xc nh dung lng ca 1my bin p theo cng thcl:
Chn my bin p tiu chun ca ABB l .Vi trm bin p t 2 my lm vic song song th cng sut mi myphi m bo iu kin kim tra s c.Kim tra iu kin qu ti s c, chn
:
Vy trm bin p B3 t 2 my , .- Trm B4: t 2 my bin p lm vic song song.
Vi , ta xc nh dung lng ca 1 my bin p theo cng thcl:
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Chn my bin p tiu chun ca ABB l .Vi trm bin p t 2 my lm vic song song th cng sut mi myphi m bo iu kin kim tra s c.Kim tra iu kin qu ti s c, chn :
Vy trm bin p B4 t 2 my , .- Trm B5: t 1 my bin p lm vic.
Vi , ta xc nh dung lng ca 1my bin p theo cng thcl:
Chn my bin p tiu chun ca ABB l .Vy trm bin p B5 t 1 my
,
.
-
Trm B6: t 2 my bin p lm vic song song.
Vi , ta xc nh dung lng ca 1my bin p theo cng thcl:
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Chn my bin p tiu chun ca ABB l .Vi trm bin p t 2 my lm vic song song th cng sut mi myphi m bo iu kin kim tra s c.Kim tra iu kin qu ti s c, chn :
Vy trm bin p B6 t 2 my , .Kt quc ghi trong bng di y:Bng 6: Kt qu chn bin p cho cc trm BAPX:TT Tn phn xng
S
my
Tn trm
1 Phn xng tin ckh
B12 PX dp B236
PX lp rp s 1Phng th nghimtrung tm
B34 PX lp rp s 2 B45
9
PX sa cha c kh
Phng thit k
B5
7
8
Phng kim nh thnghimTrm bm
B63. Phng n i dy mng cao p.
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a) Chn ng dy t trm BATG n trm PPTT.ng dy cung cp t trm BATG v trm PPTT ca nh my di15km s dng ng dy t treo trn khng, dy nhm li thp.
Bng 5: Tr s mt dng in kinh t Loi dy
dnTmax5000h
A v AC 1,3 1,1 1Cp li
ng 3,5 3,1 2,7Cp linhm
1,6 1,4 1,2
Ta c s liu ban u thi gian s dng cng sut ln nht Tmax = 4000gi, vi gi tr ca Tmax, ng vi dy dn AC tra bng ta c mt dng in kinh t :
Chn dy nhm li thp tit din , AC-70. Kim tra dy chntheo iu kin dng s c.Tra bng ta c dy dn AC-70 c .Khi t 1 dy, dy cn li chuyn ti ton b cng sut:
Vy c .Kim tra dy dn chn theo iu kin tn tht in p.Vi dy AC-70 c khong cch trung bnh hnh hc gia ccdy dn, tra bng ta c v
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Ta c tn tht in p trn ng dy l:
Vy dy dn chn l AC-70 tha mn iu kin tn tht in p.
V nh my thuc h loi 1, nn ng dy cung cp in cho nh my ttrm BATG v trm PTTT dng ng dy trn khng l kp.m bo m quan v an ton mng cao p trong nh my ta dng cp
ngm.
b) Chn cp cao p t trm PPTT n cc trm BAPXDo tnh cht quan trng ca ph ti h loi 1 nn dng s hnh tiacung cp in hnh tia. T trm PPTT n cc trm bin p B1, B2,B3,B4,B6 dng cp lkp, n trm B5 dng cp ln.Cc trm bin p phn xng dng loi trm k, c mt mt tng gip
vi tng phn xng.V tr ca trm PPTT, cc trm BAPX c cho trn hnh di y.
Chn cp tPPTT n B1:
Vi cp li ng v , tra bng 5 ta c .Vy tit din ca dy dn l:
Chn cp ng 3 li XPLE cch in, ai thp c tit din ti thiu 2 XPLE (3 x 35).
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Chn cp tPPTT n B2:
Vi cp li ng v , tra bng 5 ta c .Vy tit din ca dy dn l:
Chn cp ng 3 li XPLE cch in, ai thp c tit din ti thiu 2 XPLE (3 x 35). Chn cp tPPTT n B3:
Vi cp li ng v , tra bng 5 ta c .Vy tit din ca dy dn l:
Chn cp ng 3 li XPLE cch in, ai thp c tit din ti thiu 2 XPLE (3 x 35).
Chn cp tPPTT n B4:
Vi cp ng v , tra bng 5 ta c .Vy tit din ca dy dn l:
Chn cp ng 3 li XPLE cch in, ai thp c tit din ti thiu 2 XPLE (3 x 35).
Chn cp tPPTT n B5:
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Vi cp li ng v
, tra bng 5 ta c
.
Vy tit din ca dy dn l: Chn cp ng 3 li XPLE cch in, ai thp c tit din ti thiu 2 XPLE (3 x 35).
Chn cp tPPTT n B6:
Vi cp li ng v , tra bng 5 ta c .Vy tit din ca dy dn l:
Chn cp ng 3 li XPLE cch in, ai thp c tit din ti thiu
2 XPLE (3 x 35).Kt qu ghi trong bng 6. V tit din ca cp chn vt cp nn khngcn kim tra theo v .Bng 6: Kt qu chn cp cao p 22kVng cp n gi,/m Thnh tin,PPTT-B1 PPTT-B2
PPTT-B3 PPTT-B4 PPTT-B5 PPTT-B6
4. Tnh ton tn tht cng sut, tn tht in nng.
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a) Xc nh tn tht cng sut tc dng ca mng cao p:Tn tht cng sut tc dng c tnh bng cng thc:
Vi .Tra bng ta c vi cp ng 3 li XPLE cch in c ai thp th .
- Tn tht trn on cp PPTT-B1:
- Tn tht trn on cp PPTT-B2: - Tn tht trn on cp PPTT-B3:
- Tn tht trn on cp PPTT-B4:
- Tn tht trn on cp PPTT-B5:
- Tn tht trn on cp PPTT-B6:
b) Xc nh tn tht cng sut trong cc my bin p phn xng:- Tn tht cng sut tc dng ca trm BAPX c 2 my bin p song
song c tnh theo cng thc sau:
( )
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- Tnh cho trm B1:
Trm B1 t 2 my do ABB ch to, tra bng PL2.2 tm c
,
, vy:
( ) - Tnh cho trm B2:
Trm B2 t 2 my do ABB ch to, tra bng PL2.2 tm c , , vy:
( )
- Tnh cho trm B3:Trm B3 t 2 my do ABB ch to, tra bng PL2.2 tm c , , vy:
( )
- Tnh cho trm B4:Trm B4 t 2 my do ABB ch to, tra bng PL2.2 tm c , , vy:
( )
- Tnh cho trm B5:Trm B5 t 1 my do ABB ch to, tra bng PL2.2 tm c , , vy:
( )
- Tnh cho trm B6:Trm B6 t 2 my
do ABB ch to, tra bng PL
2.2 tm c , , vy: ( )
Kt qu tnh ton cho trong bng di y:
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Bng 7: Kt qu tnh ton ca mng cao p.ngcp
PPTT-B1
PPTT-B2 PPTT-B3 PPTT-B4 PPTT-B5 PPTT-B6
Tng
Bng 8: Kt qu tnh ton ca cc trm BAPX.TT Tn phn xng
Tntrm
Smy 1 Phn xng tin
c khB1
2 PX dp B2
36
PX lp rp s 1Phng thnghim trungtm
B3 4 PX lp rp s 2 B4 59
PX sa cha ckhPhng thit k
B5 7
8
Phng kim nh
th nghimTrm bm
B6 Tng
c) Tn tht in nng trong mng in nh my:Tn tht in nng trong mng cao p:
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Tn tht in nng trong trm c 1 my bin p:
(
)
Tn tht in nng trong trm c 2 my bin p:
( )
Trong : - thi gian ng my bin p vo mng, ly bng thi gianvn hnh 1 nm.
thi gian chu tn tht cng sut ln nht, h.Vi bi cho h s cng sut trung bnh ca nh my , tra bng 4-1 ca chng 4, tm c . Tn tht in nng trong mng cao p: Tn tht in nng trong cc trm BAPX:
- Tnh ton cho trm B1:
( )
Bng 9: Kt qu tnh ton ca cc trm BAPXTT Tn phn xng
Tntrm
Smy
1 Phn xng tin
c khB1
2 PX dp B2 36
PX lp rp s 1Phng thnghim trungtm
B3 4 PX lp rp s 2 B4
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5
9
PX sa cha ckhPhng thit k
B5 7
8
Phng kim nh
th nghimTrm bm B6 Tng Tng tn tht in nng ca nh my l:
5) La chn s trm PPTT v cc trm BAPX.a) S trm PPTT.
Nh phn tch trn, nh my c kh thuc loi quan trng, chndng s mt h thng thanh gp c phn on cho trm PPTT. Timi tuyn dy vo, ra khi thanh gp v lin lc gia hai phn onthanh gp u dng my ct hp b. bo v chng st truyn tng dy vo trm t chng st van trn mi phn on thanh gp.t trn mi phn on cp 22kV. Chn dng cc t hp b ca hngSIEMENS, my ct loi 8DC11, cch in bng kh SF6, khng cnbo tr. H thng thanh gp c t sn trong cc tc dng nh mc
1250A. S trm PPTT v mng cao p cho trn hnh 4 v hnh 5.
Bng 10: Thng s my ct t ti trm PPTTLoi my
ct Ghi ch8DC11 12 1250 25 63
Khngcn bo
tr
b) S cc trm BAPX.V cc trm BAPX rt gn trm PPTT, pha cao p ch cn t cu chv dao cch ly. Pha hp t ptmt tng v cc ptmt nhnh.Trm hai my bin p t thm ptmt lin lc gia hai phn on,xem hnh 4. C thnh sau:
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- t 1 tu vo 22kV c dao cch ly 3 vtr, cch in bng kh SF6,khng phi bo tr loi 8DH10.
Bng 11: Thng s k thut ca tu vo 8DH10.
Loi t 8DH10 24 200 25 25Cc my bin p chn loi do ABB sn xut ti Vit Nam. Thng s kthut ca cc my tra trong s tay k thut hoc ph lc 2.2.- Pha h p chn dng cc ptmt ca hng Merlin Gerin t trong v t
t to.6) Tnh ton ngn mch.
Cn tnh ton im ngn mch N ti thanh ci trm PPTT kim tramy ct, thanh gp v tnh cc im ngn mch N1, N2 , N3 , N4 , N5 ,N6 ti pha cao p trm BAPX kim tra cp v t cao p cctrm(hnh di).
- in khng ca h thng:
Trong l dung lng ngn mch v pha h p ca trm bin pkhu vc. Theo bi V .Do
- in trv in khng ca ng dy:
Trong : v l in trv in khng trn 1km dy dn (.V l chiu di ng dy ()
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- Do ngn mch xa ngun nn dng ngn mch siu qu bng dngin ngn mch n nh , ta c th vit:
Trong : l tng trt h thng n im ngn mch th i (- in p ng dy ()- Tr sdng in xung kch c tnh theo biu thc:
Bng 14: Thng s ca DK v cp cao p.
Tnh ton ngn mch ti im N:
Tnh ton ngn mch ti im N1:
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