III c4c dQng co di~n
cAc THI€T BI £lONG CAT vA BAo VE MACH £lIEN
6.4. CONG TAc TO mJi:N TIT
COng tAc ta Ia Io~i thie't bi di¢n dung d~ d6ng cAt ti'! xa, tl! dQng ho~c
bang nut 4'n cae m~ch di¢n c6 tai di¢n ap de'n 500V. dong di¢n de'n 600A. Cl)ng lac ta c6 hai vi tei: dong va cAt. Tie'p di~m duqc gilt a U'lJ.ng thai d6ng nhb c6 dbng di¢n trong cuQn day hut (cu¢n di.!u khit!!:n) ella ca ca'u
di~n ti'!.
COng tAc to' di¢n tii c6 cac b~ ph~n chinh sau: - CO' cau di¢n tit
- H¢ th6ng ti~p diem chfnh - H¢ th6ng ti~p diem phI,! - H¢ th6ng d~p h6 quang.
Tren hlnh 6.6 ve SO' dO nguyen 151 chung cua cac cOng tAc to' di¢n tit
.j , bj oj dj
Hinh 6.6
Trang SO' d6 hlnh 6.6 ta thtfy 2 bt') pMn CO' ban: CO' ca:u di¢n ti:r va cO' c~
truy~n dt')ng. CO' cau truy~n dQng g6m h¢ th6ng tay don va ti~p diem dQn: CO' ca:u truy~n dt')ng phai co k~t ca'u hQ'p 151 de giam thai gian thao tac donl cal, tang h;rc ep cac ti~p diem vA giam duQ'c ti~ng k~u va d~p.
1. CO' can di¢n til'
CO' ca'u di¢n ti:r cua cOng tAc to' g6m co m!;lch tu va cUQn day hUt.
M~ch ti:r cua cOng tac to' di¢n xoay chit!u la cac lei thep dUQ'c ghep ban hi tMp ky thu~t di¢n co chit!u dAy O,35mm d~n O,5mm de giam tOn hao sl LU do dong di¢n xoay. M~ch ti:r co d~ng hlnh chii' E ho~c chii' U, g6m 2 pMr phAn tinh (1) dUQc gMp ch~t c6 d!nh. phAn dQng (2) la nap con gQi Ia phi Ung dUQ'c n6i vai cac tie'p diem (3) qua M th6ng tay don (4).
Cu~n da.y hut (5) co di¢n tra ra't be so vai di¢n khang. Khi co don di¢n qua cut')n hilt, se co h;rc di¢n ti:r hut nAp (phAn d~ng 2). thOng qua h th6ng tay don, dong ti~p diem (3), duy tel vi trf dong ml;Lch di~n cua cOn,
t~c to (hlnh 6.6).
Nguy~n 151 lAm vi¢c cua cOng tAc to' di¢n mt')t chi~u cung tuang t\;l' nhl tren, thuang chi khac l:J hlnh dang k~t ca'u truy~n d()ng cua ml;Lch tlr tai tie': diem. COng tac to'di¢n m\lt chi~u thuang dung m<j.ch ti:r kieu xuptip, co ti~l
diem dt')ng bAt ch~t ngay vAo nAp. NgoAi ra. vi Slr dvng dong di¢n mt)
chi~u, n~n mll-ch tir thuang lam bang sat ti:r mt!m. cuOn day thuang c6 d",nl
118
,
• K,
" 2~V • •
HI .. " 6.7.1. lor,. ~a •• , 2 . .,u.:>" day K , 3: I ... xo: 4. K,- ky hl~u ,i,spdi<!lrp 'hu:lmH h b :
~. K2 1<9 hl~u tl ... p dill!!rn ,hubnlil d<l"1iI
C4c ,.d li~u ky ~hu,,~ c ... cOn. lAc tet 1.111:
- Di~n "p c1inh rnd'c U dm 1.111 di~n 4p c ... o a c1i."n n.-anS dnS mil. .ie"p <U6m chlnh phlll dOna ..,,!,t. thubnS ",0 0"0 c " p lIOV; 220V; 440V <1i¢n tn<). <U6m chlnh phlll dOna ..,,!,t. thubnS ",0 0"0 c " p lIOV; 220V; 440V <1i¢n tn<).
chill!u v.lll 127V: 220V: 380V: !JODV xoay chi40u.
CUQn hilt cO the: lilrn "l(le bloh ,huoniii' b dl(1n ""p , r o n s Sid1 hv.n 8."'1'If, dEn 10."'1% dIeD 4p <Sinh rndc.
- Dbns dieD <Sinh RHle I d "" 111 dOns di(!ln <si Qua tie-p di<!!lrrl chfnh tTODg che"
<1<;) Jam vieoc Sill" do.n IAu dill. nahr. J'" b chII!!' d..,. n ... y thb"i sian cOns tile rcr b tr"ng lhlli d608 khOng Jau qu.&l 8 Sib.
COng tAc to c6 c4c ca'p d6ng di~n' thOng dy.ng 10; 20; 25; 40; 60; 75;
100; 150; 250; 300;600A.
119
hloh tf\1 trbo, c6 the qu€n sat vao 15i. vl 15i thep it n6ng hdn truemg hqp
di~n xoay chil!u.
2. H~ th6ng liep diEm
H~ th6ng titrp diem g6m clic ti!!p diem thuoog ha(ml1) (b tr~ng thlli hb)
vA tit!p diem thuang d6ng (l1 tr~ng thlli d6ng) khi chua c6 tac dOng cua cuOn dil!u khien (cuOn hut).
Tr~n hlnh 6.7a ve vi tri cac titrp diem thuemg ha, thuoog d6ng khi khOng c6 dbng di¢n vao cuOn day di~u khien. Hlnh 6.7b ve ky hi¢u cuQn day cOng tac to K va titrp diem thuoog ha, titrp diem thuoog d6ng.
Khi c6 dong di~n vao cuOn day, 15i sAt bi hut xu6ng mQt ll!c thAng Il,l'C
day cua 10 xo ph!n 1m cho ti€p diem thuoog d6ng hi hl1 ra va titrp diem thuimg hl1 bi d6ng lllli. Nt!u cUQn day hi m€t di~n, do tac d\lng cua Il,I'c d!y cua 10 XO, h¢ th6ng cac titrp diem tra ve vi tri ban d4u.
f
-,
I I
, •
, 2
Hinh 6.7.1. (Oi lilt: 2. cUQn dl1y K; 3: (b xo: 4. K,-ky hi¢u tilp die~ thllang hlr; • 5. K2 ky hi~u tilp diem lhubng d6ng
cac s6li¢u k)' thu~t cua cOng tAc to Ill:
- Di¢n lip dinh muc Udm la di¢n lip cua mlllng di~n tUdng Ung rna tit!p diem cMnb phii d6ng edt, thulmg c6 c~c c€p 1l0V; 220V; 440V di~n m~t chi~u va 127V; 220V; 380V; 500V xoay chi~u.
CuOn hut c6 the lam vi¢c binh thuoog a di¢n ap trong gi6i h~n 85% dt!n 105% di~n ap dinh muc.
- Dbng di¢n dinh muc Idm la dong di~n di qua tit!p diem chinh trong che: dO lAm vi~c gian do~ lau dlli, nghia lA b chtr dO nay thai gian cOng tAc to 0 tr~ng thlii d6ng khOng lau qua 8 gib.
COng tac to c6 clic clfp dong di~n'thOng d\lng 10; 20; 25; 40; 60; 75; 100; 150;250; 300;600A.
liS