Thdi gian tAm bdi : 120 phit. Sinh vi6n duoc ph6p s(r duno titi li€u.
Bai 1 :D6ng co mdt chi6u kich trl ndi tidp c6 cdc sd li6u dinh mrlc : 15OO V ; 2000kW, 800v/ph. Thit ngfuer knOng tAi may nhu 6 trudng hqp mdy ph6t kich tr-t doc lAp, voi tdc dO 8Oov/ph, cho bAng kdt
quA sau :
E, [Vl 0 480 900 1 190 1 350 1 450 1 550 1 640 1 730
/,[Al 0 250 500 750 1 000 1 250 1 500 1 750 2000
Eu : srlc dii6n d6ng cam fng trong day qudn phdn tlng; llt: ddng kich ttt.
86 qua hien tuqng pfrAn ring pfr-dn ring. Di6n trd ddy qudn kich ti] ndi tidp : Rn - 0,005C) ; diqn trd mqch phdn r.rng (kd cA di6n trd dAy qudn bi vir dAy qudn cr=tc tt1 phq): R:,r = 0,0200.
DOng co ldm viQcvdi di6n dp ngudn la 1500V. Khi dong phdn r-tng l,rld 10004, tinh:
1 . Toc dO quay (1didm).
2. Moment hilu tch tr6n trqc may (bidt rdng tdng tdn hao sdt, tdn hao do ma s6t vd qu4t gi6 dtlQc
xem nhrJ ti tQ tuydn tinh vdit6c dQ quay vd co gi6 tri 125 kW 6 tdc dO 800v/ph (1didm).
3. D6ng co k6o tAi vd ddng ti6u thr,r bdy gio ld : I = 125oA, di6n 6p U ddt vdo ddng co ld bao nhi6u
dd cho tdc dO d6ng co lir 1000v/ph (1didm).
Bai2: DOng cd ddng bd 3 pha, cuc ttj dn,SOHz, 15OOkW cosip66 = 1,0, ddy qudn stato ndiY' 2300V' 30 cuc , c6 di6n khdng ddng bQ Xou = 1,9sO/pha. 86 qua c6c tdn hao c6ng sudt trong cac m6y'
1 . Tlnh dong stato dinh muc vd tdc d6 quay cfra dOng cd (1didm)
2. D6ng cd Ougc cdp di6n tt1 trldi diqn c6 c6ng sudt vO c0ng l6n, 2300 V ; 50H2. Tinh moment cuc dai dOng cd c6 rhd cung cdp cho tAi mir kh6ng bi mdt ddng bO (dong kich trJ r6to v6n gifr gi6 tri nhr] khi d6ng co k6o tAi dinh m0c) (1didm).
3. D6ng cd OLrgc cdp dion tir m6t mdy phdt turbine hoi 3 pha, stato ndi Y, 2300v , 1750 KVA, 50 Hz ,
2 cqc,vdi dien kfrang ddng b6 Xoo = 2,65 Cl. Tinh sr-tc di6n d6ng kich ttl (khOng tAi) Eour cfra m6y
phAt sao cho dQng cJ vfin ldm vi6c trong didu ki6n dinh mgc (1didm).
4.
^nOng
tnay ddi ding kich trt cfra cA Z mAy dang ho4t ddng nhrJ trong cAu 3/, vir khdng thay ddi t6c OO quay c0a OOng co so cdp k6o.mdy phdt turbine hdi, nhung tAi co hqc tren trgc dOng cd