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- [...]... 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 R,h4 dp = 0,014 X ,cao 6p = 6,05 X,ha Ap = 0,027 XM, cao eip = 17 809 RM, cao 6p = 71 400 Mdy biSn dp cung cdp diQn cho tAi ti6u... tr.t, ph6t ra c6ng sudt phAn khdng, vdi S = 30- j3000 kVA, thi tdng tdn hao tr6n s6 ld bao nhi6u ? (2d) 3 M6y biSn dp 1 pha c6 cdc sd lieu sau :c6ng sudt dinh mrlc Sdm = 1OO kVA, tdn sd Hz, di6n aip dinh mrlc U1/U2 =7200/480 V, co cdcthdng sdtinh bing ohms: R ,cao dp = 3,06 R,ha dp = 0,014 X ,cao 6p = 6,05 X,ha aip = 0,027 OO XM, cao dp = 17 809 RM, cao Ap =21 4OO Mdy bidn 6p cung cdp di6n cho tAi ti6u thu... 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 Chuyen ngirnh , .- ivton ri,i : cd BAN n n , NpIIIEN CuU SnlH d 'tZ**.al*/ cd sd Thdi gian lim bdi, Kh6ng drrgc ph6p Dd thi sd: clrwgx xcixn Ei /.t? phrit t_ ,/ tiri li€u Lf I Drr{c ph6p dilng tAi lieu I Dd thi gdm Q '*ong.Mrc Ciul: Mriy bidn aip phdn pfrdi a pha, 100 kVA, Yo /Yo,50... May Oidn dp phAn phdi3 pha,20 kVA,4600/230 V,50 Hz, c6 cdc so tieu n6 mach, sau d6 do Thit kh6ng f6i: di6n 6p dinh mfc duqc drja vdo phia h4 6p, phia cao 6p Od di6n dp dAy, dong di6n ddy vd cOng sudt tieu thu' 1 IJo = 230 Y, lo =3,5 A, Po = 152 W' duqc ngSn m4ch, sau Thit ngdn mach: dirOn dp ha thdp duqc dua vAo phfa cao dp, phia h4 ap d6 do di6n 6p diy, ddng di6n dAy vd cOngudt ti6u thu' lJnm = 225... 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... drja vdo phia hq 6p, ph(a cao dp dd h6 mach, dirOn 6p dAy, dong di6n dAy vd c6ng sudt ti6u thu' IJo = 2go V, lo = 3,5 A, Po = 152 W phia hq ap dugc ngdn m4ch' sau Thit ngdn m4ch:dign dp ha thdp dr;qc d.ta vdo phia cao dp, 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' y1p =746W... EA.I HqC gACll I'iE{oA HQI DONG TUYEN SINH SEH -oOo - rnr sAU EAI HgC NAtvt 2009 t [] xcmtN cw srNH Tuy6n sinh :,K cAo rrqc Chuyon nginh : r':ftsryt f/.i Mdn Thi : \[.6.1t C 'llr:a.,-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... vdng/phtit, cdng sudtti6u thU po = 1150 W, dong di6n (ddy) lo= 11,2 A Thinghilm vdi tAi dinh m1c:di6n dp cung cdp 380 - d0 trUdt S = 4"/o - cong suat di6n ti6u thg = 18,1 kW V,50 Hz, vdi cdc s6 ti6u do drlec: - dong di6n (ddy) ti6u thq = 32 A Tinh : al cAc tdn hao Joule trong dAy qudn stato khi khOng tAi Tdn hao Joule trong r6to khi ldm thi nghiGm kh6ng tAi ? (0,5 didm ) b/ tdn hao sdt, UiSt ring tdn hao . 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. 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. 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