1: F B Z H H: x= 0,6 ; SH1= 1000 MVA ; U=1,4 ; vi Ucb=500 KV F : x= 0,45; SF=250 MVA ; U=1 ; vi Ucb=22 KVB: S= 300 MVA ; 22/500 KV ; UN= 10,5 %Z: x= 300 ohm/1 l Bit cng sut tryn ti t F n H l Po=1 vi Scb=250 MVA1) Tnh d tr n nh tnh ng vi cc trng thi vn hnh c th c ca ng dy 2) H thng ang vn hnh vi 2 ng dy song song. V cc c tnh cng sut ca h thng khi ct 1 ng dy ra. Nu Ftt,Fht, v ng cong vn tc v gc lch tng ng. 2:

H B CH: x= 20 ; SH= 50 MVA ; UH= 1,3 vi Ucb= 22 KVB: S= 2500 MVA ; 22/6,3 KV ; UN= 11%C: x= 0,5 ; SD=1000 MVA , E= 0,2 vi Ucb= 6 KV1) Tnh Kt2) Khi ngn mch ngoi th Uht gim 50% v ng c phc hi v tr s ban u ng vi gc lch roto tr s bng 2 ln tr ban u . V cc c tnh 3: N(3)

F B ZHH: SN= 20000 MVA khi ngn mch u ng dy vi Uh= 242 KVF: x= 0,4 ; SF= 200 MVA ; U= 1,1 ; Ucb= 23 KVZ: x= 0,3 ; Scb= 110 MVA; B:S= 300 MVA ; k= 23/230; UN= 8%Cng sut truyn F n H : Po= 1; Scb= 100 MVA1) Tnh d tr n nh tnh2) V cc c tnh cng sut ng vi TDL tc ng ng my ct khi c ngn mch 3 pha xy ra u ng dy v xem thi gian ct ngn mch bng khng .Tnh gc lch rto tong ng thi im TDL ng my ct h thng gii hn n nh . Nu Ftt,Fht, v cc ng cong vn tc v gc lch tng ng. B:S= 300 MVA ; k= 23/230; UN= 11% 4:

H K CH: x= 0,5 ; Sh= 10 MVA ; U= 1,1 vi Ucb= 10 KVC: X= 20 ohm ; E= 11,5 KVK: U= 10 KV ; I= 500 A ; x= 5% ; Tng i Po=1; Scb= 1000 KVA1) Tnh d tr n nh tnh ch lm vic2) Gi s tng t ngt cng sut ng c t tr s 0 n Po=1. nh gi hot ng ca ng c . Nu Ftt,Fht, v cc ng cong vn tc v gc lch tng ng. 5:

F B Z HH: x= 30 ohm ; Sh= 1000 MVA ;U= 1,4; Ucb= 220 KVF: x= 0.45 ; SF= 250 MVA ; U= 1 vi Ucb= 22 KVB: S=300 MVA ; 22/230 KV ; Un= 11%Z: x= 300 ohm/1 lCng sut tryn t F n H l Po= 0,5 vi Scb= 250 MVA.1) Tnh d tr n nh tnh ng vi cc trrng hp vn hnh c th c ca ng dy.2) H thng vn hnh vi 2 ng dy lm vic song song .Gi s ngn mch 3pha xy ra vi thi gian ct ngn mch bng khng. nh gi qu trnh lm vic.Nu qu trnh dao ng ,v dng cong v gc lch tng ng. 6:

H K CKB H: IN= 15 KA ; khi N(3) C: X= 20 ohm ; U= 10 KVK: U= 10 KV ; I= 500 A ; x= 5%Bit cng sut ng c tiu th l : Po=1 ; Scb= 1000 KVA1) Tnh d tr n nh tnh ch lm vic ny.2) Gi s c ngn mch ngoi lm in p gim 30% v in p phc hi vi trt gp 3 ln tr s ban u . nh gi hot ng ng c.