N CUNG CP IN GVHD: TS. TRN QUANG KHNH

LI M U

Ngy nay, trong xu th hi nhp qa trnh cng nghip ha hin i ha c pht trin rt mnh m. Trong nhng nm gn y nc ta t c rt nhiu cc thnh tu to ln, tin c bn a t nc bc vo thi k mi thi k cng nghip ha, hin i ha. Trong qu trnh th ngnh in ng mt vai tr ht sc quan trng, l then cht, l iu kin khng th thiu ca ngnh sn xut cng nghip. Ngoi s pht trin mnh m ca nn kinh t, i sng x hi ca ngi dn cng c nng cao, nhu cu s dng in ca cc ngnh cng nng nghip v dch v tng ln khng ngng theo tng nm, nhu cu khng ch i hi v s lng m cn phi m bo cht lng in nng. m bo cho nhu cu chng ta cn phi thit k mt h thng cung cp in m bo cc yu cu k thut, an ton, tin cy v ph hp vi mc s dng. Do n thit k h thng cung cp in l yu cu bt buc vi sinh vin ngnh h thng in. n: Thit k h thng cung cp in cho mt chung c cao tng l mt bc lm quen ca sinh vin ngnh h thng in v lnh vc thit k cung cp in v n l mt ti mi v cn kh nhiu vn phc tp trong qu trnh thit k. Sau mt thi gian lm n, di s hng dn ca thy Trn Quang Khnh, n nay, v c bn em hon thnh ni dung n mn hc ny. Do thi gian c hn nn khng th trnh khi nhng thiu st, em rt mong c s ch bo, gip ca cc thy c n ny c hon thin hn. ng thi gip em nng cao trnh chuyn mn, p ng nhim v cng tc sau ny.Em xin chn thnh cm n thy gio TS.Trn Quang Khnh gip em hon thnh n ny. H Ni, thng 12 nm 2013 Sinh vin thc hin V Trung Dng

Mc LcLI M U1A. BI4B.NHIM V THIT K7CHNG 1 - TNH TON NHU CU PH TI71.1L lun chung71.2Ph ti sinh hot81.3Ph ti ng lc121.4Ph ti chiu sng131.5Tng hp ph ti14CHNG 2 - XC NH S CUNG CP IN152.1. Chn v tr t trm bin p (TBA).152.2. La chn cc phng n (so snh t nht 2 phng n)162.2.1. Phng n A162.2.2. Phng n B.18CHNG 3- CHN S LNG CNG SUT MY BIN P21V CHN TIT DIN DY DN213.1 Chn tit din dy dn213.1.1 La chn phng n i dy t im u in n trm bin p213.1.2 Chn dy dn t trm bin p n t phn phi223.1.3 chn s mch in ( so snh t nht 2 phng n)233.1.3.1 S mng in bn ngoi233.1.4 Chn dy dn n cc tng253.1.5 Chn dy dn cho mch in thang my283.1.6 Chn dy dn cho mch in trm bm283.1.7 Chn dy dn cho mng in chiu sng293.2 Chn cng sut v s lng my bin p.313.2.1. Tnh ton P,Q313.2.2 So snh cc phng n34CHNG 4 - TNH TON NGN MCH CHO MNG IN374.1 Tnh ton ngn mch trong mng in h p374.2 Chn thit b cho trm bin p404.2.1 Cu chay cao ap404.2.2 Dao cach ly404.2.3 Chng st414.3 Chon thit bi cua tu phn phi414.3.1 Chon thanh cai414.3.2 Chon s cach in424.3.3 Chon cap in lc424.3.4 Chon aptomat va cu chay424.3.5 Chon may bin dong464.4 Kim tra ch khi ng cua ng c46CHNG 5 - TINH TOAN CH MANG IN485.1 Tn tht in p.485.2 Tnh ton tn tht cng sut485.3 Tnh ton tn tht in nng49CHNG 6 - THIT K MNG IN CA MT CN H506.1 S b tr thit b gia dng.506.2 Chn thit b ca mng in cn h.50CHNG 7 - TNH TON NI T54CHNG 8 - HCH TON CNG TRNH56CHNG 959PHN TCH KINH T - TI CHNH59

NI DUNG N

THIT K CUNG CP IN CHO MT CHUNG C CAO TNG

A. BI

bi: Thit k cung cp in cho mt chung c vi cc d liu cho trong bng dl.2, ly theo ch ci u ca h v tn ngi thit k.ng vi ch ci u ca h c c d liu: s chung c (ct 2), s lng tng Ntng (ct 3), cng sut thang my (ct 4) v cng sut cc my bm sinh hot (ct 5).ng vi ch ci u tin ca tn m l d liu cng sut cc my bm khc: thot nc, b bi v cu ha (ct 6 8) v phng n tnh ton cng sut tiu th trung bnh ca loi cn h ng vi din tch tiu chun , (ct 9); ng vi ch ci u tin ca tn l d liu v sut tng ph ti sinh hot trung bnh hng nm a (ct 10), thi gian s dng cng sut cc i T (ct 11), khong cch t cc im u in th nht L1 (ct 12) v im u in th 2 L2 (ct 13) n tng ngoi ca ta nh, cc im u in kt ni vi h thng ca li trung p 22KV c cng sut ngun v cng ln (Sht ). in tr sut ca t p (ct 14) v in tr ca h thng ni t t nhin Rtn (ct 15). Chiu cao trung bnh ca mi tng l h = 3,8m. Thi gian mt in trung bnh trong nm tf = 24h; sut thit hi do mt in i vi ph ti sinh hot l: gth.sh=2500 /kWh v i vi ph ti ng lc gth.l=4500 /kWh; Sut vn u t trung bnh ca trm pht in diesel l 4,5 triu VN/KVA. Sut tiu th nhin liu trung bnh 0,42 lt/kWh, gi du diesel gdiesel = 17 ngn ng/lt. Chu k thit k l 7 nm.Chiu sng ngoi tri vi tng chiu di ly bng hai ln ri chu vi lch.c ca ta chung c (lcs = 2,5/lch.c), sut cng sut chiu sng l: P0cs2 = 30 W/m.Cc thang my c h s tip in trung bnh l: = 0,6; h s costm=0,65. H s cng sut trung bnh ca cc my bm ly bng cosb = 0,75. Ph ti sinh hot tng theo hm tuyn tnh P1 = P0.[1 + a(t-t0)] vi sut tng trung bnh hng nm l a. P0 l cng sut tnh ton nm hin ti t0. H s cng sut ca ph ti sinh hot l cossh = 0,89. H s chit khu i = 0,1; gi thnh tn tht in nng: C= 1500 /kWh; gi mua in gm = 750 /kWh; gi bn in trung bnh gb = 1250 /kWh. Cc phng n tnh ton ph ti cn h cho trong cc bng 2.1 2.7. cc s mt bng chung c biu th trong cc hnh 2.1 2.8. Cc s liu khc ly trong ph lc hoc s tay thit k cung cp in.

Bng dl2: S liu thit k cung cp in khu chung c cao tng.S liu tra theo ch ci u H v tn: V Trung Dng.

H (V)Tn m(Trung)Tn(Dng)

S S tngNtngCng sut thang myCng sut trm bm, kWLoi cn haTM,hT ngunNi t

Sinh hotthotB bic. haL1L2P.mRtn

1234567891011121314

1152x7,52x20+2x5,62x7,52x4,51870,04546000,570,58129231

Ph ti cn h: Theo bng dl.2 tra theo Tn m ta c cn h loi 7.Bng 2.7 S tnh ton ph ti cn h gia nh tiu chun (120 m2): Cn h loi 7.TtTn thit bPm Wnt,hKmtTtTn thit bPn, Wnt, hKmt

1n s t60661,015m in siu tc150010,31,0

2n ng45880,816L vi sng150010,70,6

3n compact301470,817L nng150010,61,0

4Qut bn85370,518My ht bi65010,60,7

5Qut trn120480,819My git45011,50,6

6Ti vi120380,820My ra bt a1200110,7

7Radio, u video20130,821L si65023,51,0

8My vi tnh bn125160,822Bnh n. lnh180011,51,0

9My tnh tay25280,823Vi sen nng lnh250111,0

10T lnh2301140,824Bn l80010,151,0

11iu ha kk2500250,725Chn m in300231,0

12My co ru1510,120,826Wifi151240,8

13My sy tc100010,131,027Survolteur251240,8

14Ni cm in750120,628Khc ( cm)250120,50,65

B.NHIM V THIT K

CHNG 1 - TNH TON NHU CU PH TI

1.1 L lun chung

Ph ti ca cc khu chung c bao gm hai thnh phn c bn l ph ti sinh hot (gm c chiu sng) v ph ti ng lc, trong t l ph ti sinh hot lun lun chim t l ln hn so vi ph ti ng lc. Ph ti cn ph thuc vo mc ca cc trang b cc thit b gia dng, ph ti ca cc cn h c phn thnh cc loi sau: loi c trang b cao, loi trung bnh v loi thp. Ph ti sinh hot trong khu chung c c xc nh theo biu thc sau:

Trong : kcc h s tnh n ph ti chiu sng chung trong to nh (ly bng 5%, tc l kcc=1,05); kt h s ng thi, ph thuc vo s cn h, ly theo bng 1 P0 sut tiu th trung bnh ca mi cn h, xc nh theo [bng 10.pl], kW/h (ph lc); N s nhm cn h c cng din tch; ni s lng cn h loi i (c din tch nh nhau); khi h s hiu chnh i vi cn h loi i c din tch trn gi tr tiu chun Ftc (tng thm 1% cho mi m2 qu tiu chun): khi= 1+(Fi-Ftc).0,01 Fi din tch ca cn h loi i, m2;Ph ti ng lc trong cc khu chung c bao gm ph ti ca cc thit b dch v v v sinh k thut nh thang my, my bm nc, my qut thng thong v.v. Ph ti tnh ton ca cc thit b ng lc ca khu chung c c xc nh theo biu thc sau:Pl = knc.dl(tm. + Pvs.kt) ,

Trong : Pl cng sut tnh ton ca ph ti ng lc, kW; knc.dl h s nhu cu ca ph ti ng lc, thng ly bng 0,9; Ptm - cng sut tnh ton ca cc thang my; Pvs.kt cng sut tnh ton ca cc thit b v sinh-k thut. Cng sut tnh ton ca cc thang my Ptm , c xc nh theo biu thc:

Trong :knc.tm h s nhu cu ca thang my, xc nh theo [bng 2.pl]; ct s lng thang my; tmi cng sut ca thang my th i, kW. Do thang my lm vic theo ch ngn hn lp li, nn cng sut ca chng cn phi quy v ch lm vic di hn theo biu thc:

Trong : Pn.tm cng sut nh mc ca ng c thang my, kW; - h s tip in ca thang my ( = 0,6, theo bi)

1.2 Ph ti sinh hot

Chung c gm 15 tng, mi tng gm 8 phng chia lm 2 loi: 4 phng din tch 59,85m2 v 4 phng 60,90m2.Vi cn h tiu chun 120m2 ta c bng tnh ton s liu cc thit b:H s s dng tng hp ca c nhm: TTTn thit bPn,Wnt,hkmtklvksdP,Wksd.P

1n si t 606610,2500,25036090,000

2n ng45880,80,3330,26736096,000

3n compact301470,80,2920,23342098,000

4Qut bn85370,80,2920,23325559,500

5Qut trn120480,80,3330,267480128,000

6iu ha kk2500250,70,2080,1465000729,167

7Ti vi120380,80,3330,26736096,000

8Radio, u20130,80,1250,100202,000

9My vi tnh125160,80,2500,20012525,000

10my tnh tay25280,80,3330.2675013,333

11t lnh2301140,80,5830,467230107,333

12My co ru1510,120,80,0050,004150,060

13My sy tc100010,1310,0050,00510005,417

14Ni cm in750120,60,0830,05075037,500

15m in siu tc150010,310,0130,013150018,750

16l vi sng 150010,70,60,0130,008150011,250

17L nng150010,610,0250,025150037,500

18my ht bi65010,60,70,0250,017565011,375

19My git45011,50,60,06250,037545016,875

20My ra bt a1200110,70,0416670,029167120035,000

21L si65023,510,1460,1461300189,583

22Bnh n.lnh180011,510,06250,06251800112,5

23vi sen nng lnh2501110,0416670,04166725010,417

24bn l80010,1510,006250,006258005,000

25chn m in3002310,1250,12560075,000

26Wifi151240,810,81512,000

27Survolteur251240,810,82520,000

28Khc( cm)250120,50,650,0208330,013542300040,625

1601575240152083,185

= = = 0,087 < 0,2Chn thit b c cng sut ln nht ca nhm l: Pmax = 2500 (W).Tng cng sut ca nhm thit b ln l ( Pj >=Pmax/2 = 1250(W): Pnj = 2500 + 1500 + 1500 + 1500 + 1800 = 8800S lng cc thit b ln l: nj = 5.Cc gi tr tng i: = = = 0,066. = = = 0,37. = = = 0,38S lng hiu dng l: nhd = .n = 0,38.75 = 28,5.H s nhu cu ca nhm l: Knc = ksd + = 0,087 + = 0,26Cng sut tnh ton ca nhm l: Ptt = knc. = 0,26.24015 = 6244(W) = 6,244 (kW)Chu k thit k l 7 nm. Chn nm c s l nm thit k: t0 = 1.Ph ti tng theo hm tuyn tnh vi sut tng trng trung bnh hng nm l a=4,5%.Tnh ton cho nm th 7 ta c: P07 = Ptt(1+a(t-t0)) = 6,244.(1+0,045(7-1)) = 7,93(kW)SttP0tP0-i

16,2440,04516244,00

26,2440,04526524,98

36,2440,04536805,96

46,2440,04547086,94

56,2440,04557367,92

66,2440,04567648,90

76,2440,04577929,88

Ph ti sinh hot tng tng.Ph ti sinh hot trong chung c c xc nh theo biu thc: PshTi = kcc.ktTi.P07.;Trong : P07 sut tiu th trung bnh ca mi cn h, xc nh theo cn h tiu chun;ni - s cn h c cng din tch;Ta c:Tng s cn h Nh=N.nh=15.(4 + 4) = 120 h;ng vi s h Nh=120, h s kt tnh theo phng php ni suy ta c:

Kdt= 0,31 +

Xc nh ph ti sinh hot ca to nh chung c :

Psh= kcs.kdt.P0.= kcs.kdt.P0.(n1.kh1+n2.kh2+n3.kh3) n1- s cn h c din tch 59,85 m2 l 15.4 = 60 h; n2- s cn h c din tch 60,90 m2 l 15.4 = 60 h;Trong kh1,kh2, ln lt l cc h s hiu chnh i vi cc cn h din tch trn 120 m2 tng thm 1% cho mi m2 i vi cn h dng bp in. kcs - h s tnh n ph ti chiu sng chung trong ta nh (ly bng 5%, tc kcs=1,05). kh1=1 - (59,85-120).0.01= 1,6015; kh2=1 - (60,90-120).0,01= 1,591;

Vy: Psh=1,05.0,326. 6,244.(60.1,6015+ 60.1,591) = 409,4(kW);

Tnh ph ti ring cho mi tng.Cng sut tnh ton ca mi tng c xc nh nh sau: ng vi mi tng l 8 h nn ta c Kdt tnh theo phng php ni suy [bng 1.pl];

Kdt= 0,47 +

Ptang = kcs.kdt.P0.= 1,05.0,502.6,244(4.1,6015+4.1,591) = 39,38 kW Ta c: H s cng sut cossh = 0,89 (tg = 0,51) Qtang = Ptang.tgsh = 39,38.0,51 = 20,08kVAr.

1.3 Ph ti ng lc

Ph ti thang my: Trc ht ta cn quy gi tr cng sut ca cc thang my v ch lm vic di hn

Thang my c cng sut :

Ptm1=Pn.tm1. =7,5.=5,81 kW H s knc.tm xc nh theo [bng 2.pl] ng vi 2 thang my nh 15 tng l knc.tm= 1.

Vy knc.tm.=1.( 2x5,81)=11,62 kW

Ph ti tnh ton ca trm bm:

+Ph ti trm bm c coi l thuc nhm ph ti v sinh k thut. +Ph ti trm bm c 9 my bm chia lm 4 nhm : Ta ln lt tnh ph ti cho 4 nhm ny nh sau Nhm 1: Cp nc sinh hot H s nhu cu ca 4 my ly bng Phng php ni suy: Knc1 = 0,8 +

Pbm1 = knc1.= 0,85.(2.20 + 2.5,6) = 43,52 kW Nhm 2 : Thot nc H s nhu cu ca 2 my ly bng 1; [bng 3.pl]

Pbm2 = knc2.= 1.2.7,5 = 15 kW Nhm 3 : B bi H s nhu cu ca 2 my ly bng 1; [bng 3.pl]

Pbm3 = knc3.= 1.2.4,5 = 9 kW Nhm 2 : cu ha. H s nhu cu ca 1 my ly bng 1; [bng 3.pl]

Pbm4 = knc4.= 1.1.18 = 18 kW

Bng 1.2. Tng hp ph ti ng lc:

NhmkncS my x cng sutPbmi ,kW

Nc sinh hot0,852x20 + 2x5,643,52

Thot nc12x7,515

B bi12x4,59

Cu Ho11818

Tng85,52

Tng hp 4 nhm ny ta c ph ti ca trm bm: Vi 4 nhm my bm nn theo bng 3.pl ta c knc = 0,8

Pbm = knc. = 0,8.85,52 = 68,416 kW Ta tng hp ph ti trm bm v thang my bng phng php s gia

V Pbm > v mng in ang xt l mng h p Vy nn ph ti ng lc:

Pl = Pbm + = 68,416 + Pl = 75,67 kW. 1.4 Ph ti chiu sng

Ta c chu vi chung c s 1 l: 84m Tng chiu di mch chiu sng ngoi tri(ly bng 2,5 ln chu vi ta nh) Lcs2 = 2,5.84=210m Cng sut chiu sng ngoi tri Pcs2 = p0cs2.Lcs2 = 0,03.210 = 6,3 kW.

1.5 Tng hp ph ti

Tng hp ph ti ph ti sinh hot v chiu sng bng phng php s gia: Ta c Psh = 409,4 kW > Pcs2 = 6,3 kW

Vy =Psh&cs= Psh += 409,4+ . 6,3

=Psh&cs = 413,18 kW Cng sut tnh ton ca to nh chung c:

Ptt = += 413,18 + . 75,67 Ptt =466,5 kw.

Cng sut v h s cng sut ca cc nhm ph ti cho trong bng 1.3 sau.

Bng 1.3. Cng sut v h s cng sut ca cc nhm ph ti

Nhm ph tiThang myBmSinh hotChiu sng

Cng sut ,kW11,6268,416409,46,3

H s cng sut0,650,750,891

H s cng sut ca my bm nc cng nghip,ca h gia nh c s dng bp gas ln lt tra [bng 13.pl] v [bng 9.pl] , h s cng sut ca ph ti chiu sng ly bng 1.

H s cng sut ca nhm ph ti ng lc:

cos== = 0,74

H s cng sut tng hp ca chung c:

cos= = = 0,86

Vy cng sut biu kin l:

S = == 542,44 kVA.

Q == = 277 kVAr.CHNG 2 - XC NH S CUNG CP IN

2.1. Chn v tr t trm bin p (TBA).

Nh bit, v tr ca trm bin p cn phi t ti trung tm ph ti, tuy nhin khng phi bao gi cng c th t c iu , v l do v kin trc, thm m v iu kin mi trng. tng xy ra cc trng hp phn nn v ting n ca my bin p t bn trong ta nh. i vi cc ta nh nh, v tr ca cc trm bin p c th b tr bn ngoi. i vi cc ton nh ln vi ph ti cao, vic t my bin p bn ngoi i khi s gy tn km, bi vy ngi ta thng chn v tr t bn trong, thng tng mt, cch ly vi cc h dn. Trm bin p cng c th t tng hm bn trong hoc bn ngoi ta nh. Phng n t trm bin p tng hm gn y c p dng nhiu, tuy nhin y cn c bit lu n h thng thng thong v iu kin lm mt ca trm. Nhn chung, chn v tr lp t ti u cn phi gii bi ton kinh t - k thut, trong cn phi xt n tt c cc yu t c lin quan. Cho php t TBA trong khu nh chung c nhng phng phi c cch m tt v phi m bo yu cu k thut theo tiu chun mc n cho php trong cng trnh cng cng 20 TCN 175 1990. Trm phi c tng ngn chy cch li vi phng k st v phi c li ra trc tip. Trong trm c th t my bin p (MBA) c h thng lm mt bt k.Chn v tr t trm bin p l tng hm. V nhng l do sau:+ Tit kim c mt din tch t nh.+ Lm tng tnh an ton cung cp in i vi con ngi.+ Trnh c cc yu t bt li ca thi tit gy ra.

2.2. La chn cc phng n (so snh t nht 2 phng n)2.2.1. Phng n Aa. S mng in bn ngoi:S mng in ngoi tri c xy dng cp in n cc t phn phi u vo ca ta nh. Trong t phn phi u vo ta nh c trang b cc thit b ng ct, iu khin, bo v, o m. S mch in ca t phn phi ph thuc vo s cp in ngoi tri, s tng ca ta nh, s hin din ca ca hng, vn phng, cng s, s lng thit b ng lc v yu cu v tin cy cung cp in. Ph thuc vo nhng yu t trn mi ta nh c th c mt, hai, ba hoc nhiu t phn phi. cung cp in cho cc ta nh c cao l 15 tng c th p dng s hnh tia.La chn s cung cp in phi da vo 3 yu cu:+ tin cy+ An ton+ Tnh kinh t

Hnh 2.2 S mng in bn ngoi.1,2,3 - ng dy cung cp chnh.4,5,6 - T phn phi vi c cu chuyn mchTrong s ny, mt trong cc ng dy, chng hn ng 1 c s dng cp in cho cc cn h v chiu sng chung (chiu sng hnh lang, cu thang, chiu sng bn ngoi) cn ng dy kia dng cung cp in cho cc thang my, thit b cu ha, chiu sng s c v cc thit b khc Khi xy ra s c trn mt trong cc ng dy cung cp, tt c cc h dng in s c chuyn sang mch ca ng dy lnh. Nh vy cc ng dy cung cp in phi c la chn sao cho ph hp vi ch lm vic khi xy ra s c. i vi ta nh 15 tng c nhiu n nguyn, cn tng thm s ng dy cung cp ln ba, thm ch hn ba l. s ny ng dy th nht s ng vai tr d phng cho ng dy th hai, v phn mnh, ng dy th hai - lm d phng cho ng dy th ba v cui cng ng dy th ba lm d phng cho ng dy th nht.b. S mng in trong nh:Vic xy dng mng in phn phi trong ta nh thng c thc hin vi cc ng trc ng. u tin l la chn s lng v v tr lp t cc ng trc ng. S trc ng cung cp in cn h qua tng.

Hnh 2.3 S mng in trong nh.

2.2.2. Phng n B.a. S mng in bn ngoi:S mng in ngoi tri c xy dng trn mt ng trc cung cp cho c chung c, ng lc v chiu sng. S ny c u im hn s trn l tit kim c chi ph dy dn nhng khi c s c th khng m bo cung cp in lin tc. V th ta chn s mng in bn ngoi l phng n A.

b. S mng in bn trong: S tia (Cc tng c cung cp in bng cc tuyn c lp).

Hnh 2.4 S mng in trong nh: S tia

CHNG 3- CHN S LNG CNG SUT MY BIN PV CHN TIT DIN DY DN

3.1 Chn tit din dy dn tng tin cy ca mng in s c b tr 2 ng dy h tr d phng cho nhau c tnh ton mi ng dy c th mang ti an ton khi c s c mt trong 2 ng dy m khng lm gim cht lng in trn u vo ca cc h tiu th; Cc mch in sinh hot, chiu sng v thang my c xy dng c lp vi nhau. Mch chiu sng c trang b h thng t ng ng ngt theo chng trnh xc nh.3.1.1 La chn phng n i dy t im u in n trm bin p

+ Phng n: dng ngun cp l ng dy 22 kV u t im u in th nht L = 0,57Km.

D nh dng dy cp cch in giy hoc cht do, li nhm c = 32.m/mm2 .cho trc mt gi tr . Hao tn in p cho php l Ucp = 1,25%.Vi L = 0,57kmGi tr hao tn in p cho php:

Ux1% =. 100 = .100 = 0,013

Thnh phn hao tn in p tc dng l: Ur1% = Ucp1% - Ux1% = 1,25 0,013= 1,237 %

Tit din dy dn ca ng dy cung cp cho trm bin p xc nh theo biu thc:

F1 == = 14 mm2Theo iu kin v b c hc tit din ti thiu ca ng dy 22kV phi l 25 mm2 vy ta chn cp 25mm2 c r01 = 1,24 v x01=0,135 theo [bng 23.pl]Hao tn in p thc t

U1% = = .0,57.103.100 = 0,072% < 1,25%Nh vy cp chn m bo yu cu v cht lng in p

Tn tht in nng trn cc on ng dy theo phng n ny

A1 =Trong

- thi gian tn tht cng sut cc i.

=(0,124 + TM.10-4)2.8760 = (0,124 + 4600.10-4)2.8760=2987h. Vy:

A1 == .1,24.0,57.103.2987,8.10-6 = 1284 kWh

Chi ph do tn tht lCA = c.A1 =1500. 1284 = 1,926.106 Trong :

- Gi thnh tn tht in nng. = 1500/kWhSut vn u t ca cp cao p c tit din 25mm2 l v01 = 1321.106 /km (tra bng 33.pl)H s tiu chun s dng vn u t:

Vi Th tui th cng trnh. Ly Th = 25 nm.Tra bng 31.pl vi ng dy cao p kkh% = 2,5%

Chi ph quy i theo phng n 1 lZ1 = p.v0.l + CA =0,135.1321.106.0,57+ 1,926.106 = 103,57. 106

Bng 3.1. Cc ch tiu kinh t ca phng n i dy cao p

Phng nL,kmVo.106,kWhC.106Z.106

10,57132112841,926103,57

3.1.2 Chn dy dn t trm bin p n t phn phi T phn phi trung tm ly ngun t trm bin p v my pht d phng thng qua b chuyn i ngun t ng: my pht t khi ng khi ngun chnh t my bin p mt v tt khi ngun chnh c tr li.T phn phi trung tm cp ngun cho cc t phn phi trung gian cc tng. Thng thng mt tuyn dy ngun cp cho bn nm tng. Ngoi ra n cn cung cp ngun cho cc ph ti chnh nh my iu ha trung tm, thang my, h thng bmTng t ti lng thang my tng 1 Vi chiu di t trm bin p n t phn phi l1 = 32 m, trong tng s hao tn in p cho php 4,5% ta phn b cho 3 on nh sau:

- T trm bin p n t phn phi tng.

- T t phn phi tng n t phn phi cc tng.

- T t phn phi cc tng n cc h gia nh.

D nh chn dy cp li ng c dn in

S b chn , xc nh thnh phn hao tn in p phn khng

Ux1% =.100 = .100 = 0,61 %Thnh phn hao tn in p tc dngUr1% = Ucf1% - Ux1% = 2 0,61 = 1,39 %

Tit din dy dn ca ng dy cung cp cho t phn phi tng c xc nh theo biu thc

F1 == = 137,7mm2Vy ta chn cp ng(Cu) XLPE-150 mm2 c r0= 0,122 v x0= 0,059Hao tn in p thc tU1 = l1.100 = .32.100 = 1,62 < 2%Nh vy cp chn m bo yu cu v cht lng in p3.1.3 chn s mch in ( so snh t nht 2 phng n)3.1.3.1 S mng in bn ngoiKhi la chn s cung cp in cho chung c, cc ph ti thang my, chiu sng, s c.vv c coi l ph ti loi 1 c tin cy cung cp in cao, bi vy s cung cp in cho chung c nht thit phi c hai ngun in. Ta la chn s li toia c t ng ng d phng t phn phi u vo.Ta so snh 2 phng n chn ngun d phng: phng n th nht ly ngun d phng ly t im u in th 2 , cch ta nh chung c 0,58 km v phng n 2 dng my pht in diesel c cng sut nh mc cung cp cho h thng thang my v chiu sng s c.a) Phng n 1: dng ng dy d phng ly in t im u in 2: Trc ht ta chn dy dn ca ng dy d phng theo mt dng in kinh t, dng dy cp ng vi Jkt= 3,1 (A/mm2). Dng chy trn ng dy:I = = = 14,24(A)Tit din thanh dn: Ftt = = = 4,59 (mm2) m bo mng in lm vic tin cy ta chn cp 22kV loi CBG 4x16 c sut in tr r0 = 0,11(/km) v sut vn u t l v0 = 1397 ( triu VN/km) tng vng u t ng cp d phng s l 1397.0,58 = 810,26 ( triu VN)Tn tht in nng trn on cp trong khong thi gian mt in ( tf-24) l khng ng k nn c th b qua.Chi ph tnh ton theo phng n 1: Z1 = p.V1 = 0,061.810,26 = 49,426 ( triu VN)Vi p = atc + kkh = 0,031 + 0,03 = 0,061 atc = = = = 0,031b) phng n 2: s dng trm pht in Diesel: Cng sut ca my pht in diesel c chn cung cp cho ti ng lc tr ph ti ca trm bm b bi. Ta chn my c cng sut nh mc l Sdie = 50(kVA), h s cos = 0,8, c sut vn u t l bdi = 4,5 (tr.VN/kVA) chi ph nhin liu trung bnh l 0,42 (lit/kWh).Tng vn u t cho trm diesel l: V2= v0die. Sdie = 4,5. 50 = 225(tr.VN)Chi ph nhin liu trong thi gian mt in: B = bdi.Adie = bdi.Sdie. cos tf = 0,42.50.0,8.24= 403,2(lit)Thit hi do mt in: Y = gth.sh.Psh.tf + gth.dl.Ptm.tf = ( 2500.409,4.24+4500.11,62.24). 10-6 = 25,82( tr.VN)Chi ph tnh ton: Z2= p2.V2 + gdie.B+Y= 0,1.225+17.10-3+ 25,82 = 48,337( tr.VN)c) kt lun Phng n12

Chi ph tnh ton Z(tr.VN)103,5748,337

So snh cc kt qu tnh ton, thy phng n 2 c tng chi ph tnh ton nh hn. Vy ta chn phng n 2 dng trm pht in diesel. Chn cng sut my pht d phng Cng sut my pht cung cp cho ti ng lc tr ph ti ca trm bm b bi.Ta c: P = Pdl - Pbb = 75,67 2.4,5 = 66,67(kW) cos = = 0,76Smpdp = Ssc = = = 87,72 ( kVA)Vy ta chn my pht 3 pha c cng sut l 100kW/150(kVA) H thng in 1 chiu+ Ta s dng h thng acquy dng chiu sng s c.+ Cc bng n dng chiu sng s c c b tr dc theo cu thang thot him ca chung c t tng 1 n tng 12.+ H thng in mt chiu dng cho cc thit b in t dng in mt chiu trong phng iu khin.3.1.4 Chn dy dn n cc tng C th thc hin theo 2 phng n: phng n 1 mi tng mt tuyn dy i c lp; phng n 2 chn mt tuyn dy dc chung cho tt c cc tng.a. Phng n 1:Mi tng mt tuyn dy i c lp. Tnh ton cho tng cao nht l tng 15:

Chiu di t t phn phi tng n t phn phi tng 15 l:L2 = 3,8.15 = 57mCng sut phn khng ca tng tng: Q tng = 20,08 kVArThnh phn ca hao tn in p:

Ux2% =.100 = .100 = 0,079 %Thnh phn hao tn in p tc dng cho php l: Ur2% =Ucp2- Ux2% = 1,25-0,079=1,171 %Tit din dy dn t t phn phi tng n tng t phn phi ca mi tng l:

F2 == = 24,58 mm2

Ta chn cp h p XLPE c tit din 35 mm2 c r01 = 0,52 v x01 =0,064 Hao tn thc t:U2 = .l2.100 = . 57.100 = 0,86% < 1,25%

Nh vy cp chn m bo yu cu v cht lng in p.b. Phng n 2: Chn mt tuyn dy dc chung cho tt c cc tng

S ng dy ln cc tng

Coi ng dy ln cc tng c ph ti phn phi u.

Ux2% =.100

Trong - tng cng sut phn khng tnh ton ca ph ti sinh hot

Qsh = Psh.= 409,4.0,51=208,794 kVAr;

Vy: Ux2% =.100 = .100 = 0,41%Thnh phn hao tn in p tc dng cho php l:Ur2% =Ucp2- Ux2% = 1,25-0,41=0,84%Tit din dy dn c xc nh theo biu thc:

F2 == = 178mm2

Ta chn cp h p XLPE-185 c tit din 185 mm2 c r01 = 0,11 v x01 =0,06.Hao tn in p thc t:U2 = = .57.100 = 1,14% < 1,25%Vy cp chn l tho mn.

c. So snh 2 phng n: Phng n 1.Tng chiu di ca tt c cc nhnh dy ln tng l: l1 = 3,8.(1+2+3+..+15) = 456 mTn tht in nng trn cc on ng dy theo phng n :

A1=.r0. l1. 10-3=.0,52.456.2987.10-6 = 9584,26 kWhChi ph do tn tht l:CA = c.A1 =1500.9584,26 = 14,376.106 Trong :

- Gi thnh tn tht in nng. = 1500/kWhSut vn u t ca cp XLPE-35 l v01 = 725.106 /km (tra bng 32.pl)H s tiu chun s dng vn u t:

Vi Th tui th cng trnh. Ly Th = 25 nm.Tra bng 31.pl vi ng dy h p kkh% = 3,6%

Chi ph quy i theo phng n 1 l:Z1 = p.v01.l1 + CA =0,146.725.106.0,456 + 14,376.106 = 62,644.106 Phng n 2:Tn tht in nng:

A2=.r0.l2. 10-6=.0,11.57.2987.10-6= 13696,39kWhChi ph tn tht l:CA = c.A2 =1500. 13696,39= 20,55.106 Sut vn u t ca cp XLPE-185 l v02 = 2174 .106 /km (tra bng 32.pl)Chi ph quy i theo phng n 2 l:Z2 = p.v02.l2 + CA =0,146.2174.106 .0,057 + 20,55.106 =38,64.106

Bng 3.2. Cc ch tiu kinh t ca 2 phng n i dy n cc tng

Phng nL,mVo.106,kWhC.106Z.106

14567259584,2614,37662,644

257217413696,3920,5538,64

So snh kt qu tnh ton ta thy v k thut c 2 phng n u m bo yu cu v cht lng in, v kinh t: tng chi ph quy i ca phng n 2 nh hn phng n 1 dy dn c chn theo phng n 23.1.5 Chn dy dn cho mch in thang my Vi thang my c cng sut (P =7,5 kW)

T phn phi chnh lng thang my nn Chiu di n thang my l l3 = 5m, ta c h s .Tng s hao tn in p cho php Ucp% = 1,25%Cng sut phn khng ca thang my l

Qtm= Ptm.tg= 7,5..1,17 = 6,8 kVArXc nh thnh phn hao tn in p phn khngUx3%= .100 = .100% = 0,022%Thnh phn hao tn in p tc dng cho php l:Ur3% =Ucp3- Ux3% = 1,25-0,022 =1,228%Tit din dy dn c xc nh theo biu thc:Ux3%= = = 2,79mm2

Ta chn cp h p XLPE-4 c tit din 4 mm2 c r032 = 4,85 v x032 =0,09 Hao tn in p thc t: .46.100=0,92< 1,25 %Cp ta chn l tha mn iu kin hao tn in pVi tng s thang my l 2x7,5 ta b tr 2 thang my c cng sut 7,5 vi chiu di dy l 5m.3.1.6 Chn dy dn cho mch in trm bmChiu di t t phn phi tng n trm bm l l4 = 50mXc nh thnh phn hao tn in p phn khng

Ux4%=

Trong : Qbom= Pbom.tg= 68,416.0,88 = 60,2 kVArVy: Ux4%= .100 = 100 = 0,2%Thnh phn hao tn in p tc dng cho php l:Ur4% =Ucp4- Ux4% = 1,25-0,2 = 1,05 %Tit din dy dn c xc nh theo biu thc:Fbm = = = 42 mm2

Ta chn cp h p XLPE-50 c tit din 50 mm2 c r04 = 0,4 v x04 =0,06 Hao tn in p thc t:=.50.100=1,07< 1,25%Cp ta chn l tha mn iu kin hao tn in p.3.1.7 Chn dy dn cho mng in chiu sng Mng in chiu sng ngoi tri. Do theo u bi ra tng chiu di mng in chiu sng ngoi tri bng 2,5 ln chu vi ta nh do ta c: lcsngoai =2,5.84= 210m

OABCL = 30 MOAL = 60 MACL = 120 MABHnh 3.1 S chiu sng ngoi tri

Mng chiu sng ngoi tri c b tr nh hnh v trn;chiu di on OA=30 m,on AB c lA-B=120 m v on AC c lA-C = 60m.Sut ph ti trn mt n v chiu di l Po=0,03kW/m,hao tn in p cho php l Ucp=2,5% .Cc on dy trn ng trc t ngun O n B c xy dng vi 4 dy dn,cc r nhnh AC thuc loi 2 pha c dy trung tnh.Cng sut tnh ton chy trn on dy l:PAB=Po*lA-B=0,03.120=3,6 kWPAC=Po*lA-C=0,03.60= 1,8 kWPOA=PAB+PAC=3,6+1,8=5,4 kWM men ti ca on dy:

162 kWm

kWm

kWmTra bng 26.pl ta c C=83 v tra bng 27.pl ta c =1,39.Xc nh mmen quy i:Mqd=MO-A+(MA-B+MA-C)=162+1,39( 216+54)=537,3 kWmTit din dy dn trn on u:

FO-A= =mm2Ta chn dy cp ng loi PVC-10 c ro=1,84/km v xo=0,073/km Hao tn in p thc t trn on OA:

% < 2,5%Hao tn in p trn cc on cn li:UAB =UAC =Ucp -U0A =2,5-0,65=1,85%Tit din dy dn trn cc on AB v AC l:

FAB = = = 2,33 mm2 Trong C=37 theo bng 26.pl Vy ta chn cp PVC-6 c ro=5,55 /km v xo=0,32 /km

FAC = = = 0,83 mm2Ta chn cp PVC-4 c ro=8,35 /km v xo=0,33 /km Hao tn thc t trn on AB v AC l:

%< 1,74 %

%< 1,74 %

Tng hao tn thc t trong mch chiu sng ngoi tri l:Ucs= U0A+UAC= 0,65+0,36=1,01% 0,5 AVy may bin dong lam vic binh thng khi phu tai cc tiu4.4 Kim tra ch khi ng cua ng c Kim tra anh hng cua che lam vic cua thang may i vi cht lng in :

BAl1 =32 ml2' = 5 mC- lch in ap khi ng c khi ng :

Ta co : ZBA = 0,014; RBA = 0,005; XBA = 0,014 Rd1 = 0,0039 Xd1 = 0,002 Rd2 = r02.l2 = 4,85.0,005 = 0,024 Xd2 = x02.l2 = 0,09.0,005 = 0,00045 - Ta c: Itm = Itm = 17,53 A-Tng tr cua ng c :Zdc = Xdc = = = 2,78 > 0,5

=>ZBA + Zd = =0,028

= 0,028

=>ZBA + Zd + Zdc=

= 2,8 = 7,65 % < 40%.100=.100=1% < 40%Vy ch khi ng cua thang may la n inh.

CHNG 5 - TINH TOAN CH MANG IN

5.1 Tn tht in p.Tn tht in ap :

Vy tinh toan tng t ta co bang kt qu 5.1 di y.

Bng 5.1. Kt qu tnh ton tn tht in p

NhnhPQ

L

Cao p466,52771,240,1355702,799

n t phn phi tng466,52770,1220,0593219,278

Ln cc tng409,4208,7940,110,065715,148

Thang my11,6213,594,850,092x515,153

Trm bm68,41660,20,40,06508,152

Chiu sng trong000000,000

Chiu sng ngoi OA5,401,840,073302,615

AB3,605,550,321205,258

AC1,808,350,33603,955

5.2 Tnh ton tn tht cng sut

Bng 5.2. Kt qu tnh ton tn tht cng sut

onL, mP, kWQ, kVAr

Cp cao p570466,52771,240,1351440,772156,858

ng trc32466,52770,1220,0597,9583,849

Ln tng57409,4208,7940,110,069,1715,002

Thang my 105,816,84,850,090,1240,002

Trm bm5068,41660,20,40,061,1500,173

Chiu sng trong000000,0000,000

Chiu sng ngoi OA305,401,840,0730,0110,000

AB1203,605,550,320,0600,003

AC601,808,350,330,0110,000

Tng1459,257165,888

5.3 Tnh ton tn tht in nngTa c: Tn tht in nng

A = P = 1459,257.2987= 4358800,659 kWh.

CHNG 6 - THIT K MNG IN CA MT CN H

Thit k cho mt tng in hnh ca chung c,phng n b tr in nh sau:6.1 S b tr thit b gia dng.

V cc cn h s dng cc thit b in khc nhau c cng sut khc nhau nn trong qu trnh tnh ton ta khng th tnh chi tit c. Ta ch chn s b cc thit b theo cc yu cu di.6.2 Chn thit b ca mng in cn h.

Dy dn ca mng in trong nh c s dng l dy cp hoc dy cch in. Tit din dy dn c la chn theo dng in cho php:

Trong :IM gi tr dng in lm vic cc i chy trn dy dn, c xc nh theo biu thc:

Trong :Ilv.i dng in lm vic ca thit b th i; kt h s ng thi, ph thuc vo cng sut v s lng thit b in c cung cp;ntbi s lng thit b c cung cp bi on dy xt.Icp gi tr dng in cho php cc i ca dy dn chn.Gi tr dng ph ti cho php ca dy dn c xc nh theo biu thc: Icp = khc. Icp.nTrong : Icp - dng in cho php ng vi tng loi dy dn, ph thuc vo nhit t nng cho php ca chng;Icp.n dng in cho php lu di ca dy dn trong iu kin bnh thng;khc h s hiu chnh theo iu kin thc t: khc= k1k2.k3k1 h s ph thuc vo phng thc lp t dy dn [bng 15.pl]k2 h s ph thuc vo s lng dy cp t chung trong ho cp [bng 16.pl]k3 - h s hiu chnh, ph thuc vo nhit trung bnh thc t ti ni lp t, c th xc nh theo [bng 17.pl].

Gi tr dng in lm vic c xc nh ph thuc vo loi mng in nh sau:

Mng in mt phaMng in 2 pha mc theo In p phamng in 3 pha

, A, A, A

S cng sut truyn ti trn ng dy, kVA;Un, Uph in p dy v in p pha, kV.Cp sau khi chn c kim tra: Theo iu kin hao tn in p: Hao tn in p thc t trn ng dy khng c vt qu gi tr cho php:

;P, Q - cng sut tc dng v phn khng chy trn on cp, kW v kVAr;r0 , x0 - sut in tr tc dng v phn khng ca on cp, /km;l - chiu di on cp, km;Un in p nh mc ca ng dy, kV; Ucp hao tn in p cho php trn on cp, gi tr hao tn in p cho php trong mng h p t thanh ci trm bin p phn phi n u vo thit b l Ucp = 5% i vi ph ti chiu sng v Ucp=7,5% i vi cc ph ti khc. Kim tra ch n nh nhit: m bo ch n nh nhit khi c dng ngn mch chy qua tit din ca cp phi ln hn gi tr ti thiu xc nh theo biu thc:

;Trong :Ik gi tr dng in ngn mch ba pha chy qua thit b, A;tk thi gian tn ti ca dng ngn mch, s;Ct h s c trng ca dy cch in, ph thuc vo vt liu dn in cho trong [bng 25.pl]. Trong trng hp thiu thng tin c th ly gi tr trung bnh theo bng 6.1.

Bng6.1. Bng gi tr h s CtCch inDn ngDy nhm

PVC(Polychlorure inyle)11576

PR(Polyethylenereticul)14394

Thit k cung cp in cho mt cn h gm c 1 phng bp, 1 phng khch, 2 phng ng v 1 phng v sinh. Ta c bng chn dy dn v thit b bo v s b nh theo bng 6.2 di y.

Bng6.2. Bng chn dy dn v thit b bo v s b

STTTn thit bS lngCng sut d kinDy dnThit b bo v

LoiK hiu

1 cm 3 cc cho iu ha1600W2,5mm2AptomatEA52G-16A

2 cm099x200W2,5mm2ntEA52G-16A

3 cm cho thit b truyn thng + my git023x600W2,5mm2ntEA52G-10A

4n compact m trn + n p trn + n treo trn1414x30W1,5mm2ntEA52G-10A

5n hunh quang; 1,2m55x40W

6n tranh + n gng45x20W

7Qut trn0160W

8Bnh nc nng12500W2,5mm2ntEA52G-16A

CHNG 7 - TNH TON NI T

V trm bin p ca ta dng cho chung c l 400kVA (> 100kVA) vy in tr ni t cho php l , in tr sut ca vng t trong iu kin m trung bnh()l =129m (vi thanh ni ngang ).Rtn = 231Chn cc tip a bng thp trn di l = 2,5 m, ng knh d= 6cm. Cc c ng su cch mt t h = 0,75 m.

Chiu su trung bnh ca cc: htb = h + = 0,75 + = 2 m-in tr tip xc ca cc tip a: Rcc ==105- Vy s lng cc c chn s b l:n= Chn n = 28. S cc ny c ng xung quanh trm bin p theo kch thc nh sau: L = 2.(20 + 15) = 70 mKhong cch trung bnh gia cc cc l la = L/n = 70/28 = 2,5 m T l la/l = 2,5/2,5 = 1Tra ng cong ng vi t l 1 v s lng cc l n=28 ta xc nh c h s li dng ca cc cc tip a l [Bng 5.pl sch bo h lao ng v k thut an ton in] v ca thanh ni l [bng 7.pl, Sch bo h lao ng v k thut an ton in].Chn thanh ni tip a bng thp c kch thc bxc = 50x6 cm. in tr tip xc xa thanh ni ngang:Rng = = .ln = 13,11

in tr thc t ca thanh ni c xt n h s li dng l: = = 53in tr cn thit ca h thng tip a c tnh n in tr ca thanh ni ngang l: = = 4,3S lng cc chnh thc l: = =51,5Vy ta chn nct =52 ccKim tra n nh nhit ca h thng tip aFmin = = 12190. = 116,5 < Stn = 50.3 = 150mVi C :l h s ph thuc vo vt liu lm thanh ni [vi thanh thp C = 74-sch bo h lao ng v k thut an ton in].Vy h thng tip a tha mn iu kin v n nh nhit.Ta c s b tr cc nh sau:

S b tr cc tip a

CHNG 8 - HCH TON CNG TRNH

Cch thit b chnh xt n trong hch ton cng trnh c lit k trong bng 8.1 Tng gi thnh cng trnh l =341,3188triu ng Tng gi thnh c tnh n cng lp t

=1,1. 341,3188=375,45 triu ng Gi thnh mt n v cng sut t

gd = =.106 = 1,877.106 /kVA Chi ph vn hnh nmCvh = k0&M.V= 0,02. 375,45.106=7,509.106

Bng 8.1. Lit k cc thit b chnh v hch ton gi thnhTTTn thit bQuy cchn vS lngn gi, 103V.106

1Trm bin p22/0,4400KVA

ci1149149

2Cu chy cao pKTb117001,7

3Chng st vanPBC-22T1b118001,8

4Dao cch lyPBP III -24/8000b116001,6

5V t inci110001

6Cp cao pCBG-25km0,57147,4284,029

7Cp h pXLPE-150m32345,611,0592

8Cp h pXLPE-185m57374,421,3408

9Cp h pXLPE-4m6545,722,9718

10Cp h pXLPE-50m50153,67,68

11Cp h pPVC-10m3037,121,1136

12Cp h pPVC-6m12035,524,2624

13Cp h pPVC-4m6021,71,302

114Cu daob18500,85

15Aptomat tngABM10CBci123002,3

16Aptomat sinh hotABM15Cci140204,02

17Aptomat tngEA103Gci153505,25

18Aptomat chiu sngEA52Gci13500,35

19Aptomat ng lcA3143ci112501,25

20Aptomat my bmA3143ci112501,25

21Aptomat TM EA103-Gci212502,50

22Khi ng tME-511ci315004,5

23Khi ng tME-311ci418007,2

24Bin dngTBJIMb33000,9

25Ampeke0-200Aci44001,6

26Vonke0-500Vci103103,1

27Cng t 3 phaci106006

28ng thanh ciCu,80X8kg10600,6

29B dn trmb135003,5

30Cc tip a(15,20)Cc521206,24

31Thanh ni50x6M70151,05

TNG341,3188

Ta c: Tng tn tht in nng trong tt c cc on dy l Ad = 51143,629 kWh.Tn tht trong my bin p ABA = 255503,17 kWh (kt qu tnh nm cui chu k tnh ton ca phng n 1 bng 3.5).Vy A = Ad + ABA = 51143,629+ 255503,17= 306646,799 kWh.Tng in nng tiu th trong nm A = P.TM = 466,5.4600 = 2145900 kWh.T l tn tht in nng

A% = .100 =.100 =14,3 %H s s dng vn u t v khu hao thit bChi ph tn tht in nng

Cht = ght.=1500. 306646,799 =460.106

p =+ kkh = + 0,036 = 0,076(cc gi tr k0&M v kkh ly theo ph lc bng 5.pl[1])Tng chi ph quy i

=(0,076. 375,45 + 460+ 7,509).106 =496.106 /nmTng chi ph trn mt n v in nngG = = = 3399,6 .kW

CHNG 9PHN TCH KINH T - TI CHNH

Trc ht ta xc nh sn lng in bn ra nm u: Ab1 = S1.TM = 4600.571,37 = 2628302 kWh; Lng in nng tn tht:

=0,143. 2628302 = 375847,186 kWh in nng mua vo:

=2628302 + 375847 = 3004149 kWh Chi ph mua in:

= 3004149. 750 = 2253,11.106 n gin ta ly n v tnh l triu ng (tr.) Doanh thu:

=2628302 .1250 = 3285,3775 tr. Chi ph vn hnh hng nm: Cvh = k0&M.V =0,02. 375,45 = 7,509 tr. Chi ph khu hao nm th nht:

= 0,036.375,45 = 13,5162 tr. Tng chi ph khng th khu hao nm th nht. Cm&vh1 = Cm.1 + Cvh1 = 2253,11+7,509 = 2260,619 tr. Dng tin trc thu T1.1 = B1 Cm&vh1 = 3285,3775 - 2260,619 = 1024,7585 tr. Li chu thu nm th nht:

= 1024,7585 13,5162 = 1011,2423 tr. Thu li tc:

= 1011,2423.0,15 = 151,686 tr. Tng chi ph ton b:

= = 2253,11+7,509 +13,5162 + 151,686 = 2425,8212 tr. Dng tin sau thu:

= 1024,7585 151,686= 873,07 tr. H s quy i

Gi tr li nhun quy v hin ti

= 873,07.0,91 = 794,4937 tr. Tng chi ph quy v hin ti

= 2425,8212.0,91 = 2207,497 tr. Tng doanh thu quy v hin ti

=3285,3775.0,91 = 2989,69 tr.Tnh ton tng t cho cc nm khc, kt qu ghi trong bng 9.1 di y.

Bng 9.1. Kt qu tnh ton phn tch kinh t ti chnh ca cng trnhNmSt kVAin nng ,10^3 kWh

Ab.103Am.103A.103BCmCm&vhT1

123456789

0000000375.45-375.5

1571,372628,3023004,15375,8473285,3782253,1122260,6211024,757

2592,722726,5123116,4389,8913408,142337,3022344,8111063,329

3614,222825,4123229,45404,0343531,7652422,0842429,5931102,172

4635,642923,9443342,07418,1243654,932506,5512514,0601140,870

5657,063022,4763454,69432,2143778,0952591,0182598,5271179,568

6678,493121,0543567,36446,3113901,3182675,5242683,0331218,285

7699,913219,5863679,99460,4014024,4832759,9902767,4991256,983

25584,1117545,58117973,5947610,464

(Tip theo bng 9.1)ttLhttltC?T2tC?*tt* BT2* t

1011121314151617

0-375,45010,000,00-375,450

1820,646123,0971688,51713,5690,911535,012172,68648,699

2849,024127,3541744,59737,6900,831441,812041,45609,662

3875,504131,3261796,93760,1980,751350,061912,10571,148

4901,983135,2971849,26782,7060,681263,071789,39534,599

5930,361139,5541905,35806,8270,621183,071676,52500,976

6956,841143,5261957,69829,3340,561105,061566,36468,138

7983,339147,5012010,06851,8590,511031,481462,39437,138

?6317,698947,65475106,7348909,5712620,883394,909

NPV = 3394,909Ta c:

Khi tn = 0 th NPV = = -375,45 tr.

V khi t = 1 th NPV = = 648,699 tr.

Thi gian thu hi vn

T= = 0+ = 0,37 nm

Vy ta c bng cc ch tiu kinh t ti chnh c bn ca cng trnh in.Bng 9.2. Bng ch tiu kinh t ti chnh c bn ca cng trnhNPVT

3394,9090,37 nm

Kt lun: Qua qu trnh thit k ta thy c vic la chn v tnh ton trong thit k l rt quan trng v nu khng la chn ng s gy rt nhiu vn phc tp nh tn tht kinh t, in p, in nng v cn c th gy c nguy him cho con ngi. Nh la chn tnh ton thit k ta thy tt c cc ch tiu kinh t - k thut ca mng in u m bo yu cu thit k chung. D n c mc ch ch yu phc v cho nhu cu sinh hot i sng ca ngi dn th, ngoi ra ta cn thy c d n mng li hiu qu kinh t vi tng vn u t l 375,450 triu ng s c thu hi trong khong thi gian l 0,37 nm y tht s khng phi l thi gian di thu hi vn khi xy mt chung c cao 15 tng. Da trn ton b cc ch tiu kinh t ti chnh, k thut c thit k v tnh ton trn cho thy d n hon ton c th tin tng chp nhn v thc hin c.

TI LIU THAM KHO1. H thng cung cp in tp 1,2.TS Trn Quang Khnh .Nh xut bn KHKT-H Ni-2006. 1. Bi tp cung cp in .TS Trn Quang Khnh .Nh xut bn KHKT- H Ni-2006. 1. Bi ging h thng CC -TS Trn Quang Khnh1. Thit k cp in .Ng Hng Quang-V Vn Tm.Nh xut bn KHKT-1998.1. Li in v h thng in tp 1 - Trn Bch-Nh xut bn khoa hc v k thut 2004. 1. H Thng Cung Cp in ca x nghip cng nghip th v nh cao tng Nguyn Cng Hin (Ch bin), Nguyn Mnh Hoch. Nh xut bn Khoa hc v K thut - H Ni 2001.

SVTH: V TRUNG DNG 41 LP: TH2-K5