I i4 24 34 44 52 62 72 82 ��� Si 6i 7i Bi rrrr
Cac yeu cftu cd ban:
+ Di�n ap djnh muc : U0rn la di$n ap m9ch di$n t- dng Cfng v6i tiep diem chfnh phai dong cat. 0i$n ap d!nh mCfc co: 11 Ov, 220v, 440v DC va 127v, 220v, 380v va 500v AC. Cu9n day hut co the lam vi$c blnh th- ong d di$n ap gi6i h9n (85% - 105%) di$n ap djnh
mCfc cua cu9n day.
+ Dong di�n djnh muc :: la dong di$n dinh mCt'c di qua tiep diem chfnh. Thoi gian cong tac td d tr9ng thai dong khong qua 8 gio. Dong di$n dinh mCfc Contactor h? ap thong
dvng co cac cap: 10, 20, 25, 40, 60, 75, 100, 150, 250, 300, 600A (neu Contactor d?t trong tu ho?c lam vi$c dai h,�m dong di$n cha phep thap hem lam tu' (10 - 15)% v1 lam mat kem.
+ Kha nang ciit dong la dong di$ri djnh mere di qua tiep diem chfnh khi cat va khi dong (4 - ?)lam d9ng co ro to long soc va 1 Ox lam doi vdi phl:J tai di$n cam.
+ TuOi thQ Contactor: d- c;,c tf nh bang so Ian dong cat, sau so Ian dong cat do cong tac to khong dung d- (Jc niia.
- 89 ben co: so Ian dong cat khong tai (10 - 20) tri$u Ian thao tac. - 89 ben di$n: so Ian dong cat tiep diem co tai 1 tri$u Ian.
+ Tan so thao tyc: so Ian dong cat cong tac to trong m9t gicr co cac cap: 30, 100, 150, 300, 600, 1200 - 1500 Ian / gicr.
+ Tinh On dfnh h;ic di�n di)ng : nghia la tiep diem chfnh cua no cha phep dong di$n 16n nhat di qua ma khong bl h/c di$n d9ng lam tach rcri tiep diem (dong di$n thi'.t = 1 0* lam)
+ Tinh On dfnh nhi�t nghia lakhi co dong ngan m?Ch Ch?Y qua trong m9t thcri gian
cha phep, cac tiep diem khong bi chay ho?c bl dfnh l?i. ❖ Dijc tinh ky thu@.t va ph�m vi ung d1:1ng:
Cong tac to co nhieu lo?i va rat da d?ng nh- ng th- crng si'.t dvng la Contactor di$n xoay chieu th- crng dung d tan so cong nghi$p (50 Hz) Contactor co so I- c;,ng tiep diem chfnh (1+ 5) tiep diem nh- ng thong dvng hon ca la Contactor co ket cau 3 clfc.
+ Dong di$n djnh mere cua cac tiep diem chfnh la dong di$n dung trong che d9 lam vi$c gian do?n - lien tvc vdi chu ky 8 gicr, thcri gian dong cat rat be. Thai gian dong (0,08 + 0, 1 s), thoi gian nha (0,03 + 0,04s)
+ Ph?m vi erng dvng: tuy theo gia trj dong di$n ma Contactor phai lam vi$c trong luc b1nh th- crng hay khi cat ma ng- cri ta dung cac cd khac nhau, ph?m vi si'.t dvng phl:J thu9c va: lo?i h9 tieu thv can d- c;,c kiem tra: d9ng co rota long soc hay rota day quan
Nhiing dieu ki$n thlfc hi$n dong md, qua tr1nh khdi d9ng n?ng, nh�, dao chieu va ham vv ...
Tom l?i Contactor co ph?m vi si'.t dvng da d9ng, si'.t dvng v6i dong di$n xoay chieu, m9t chieu, sll' dl:Jng vdi d9ng co co h$ so coscp cao cha den cac lo9i d9ng co co coscp nho. 89ng co rota long s6c cha den d9ng co rota day quan.
4.4. Hu hong va cac nguyen nhan gay bu hong: :
❖ Hi?n tuqng hu hong tie'p di Sm: ► Nguyen nhan:
- Do dong di$n v- «;1t qua tri so dinh mCi'c nh- qua tai, ngan m?ch, do di$n ap tang cao va tan so thao tac cua khf Cl) di$n khong dung voi djnh mCi'c v v .. .
- LI/C ep tren cac tiep diem khong du.
- Gia dB tiep diem khong bang ph�ng, cong, veng (nhat la doi voi lo?i tiep diem bac cau) ho?C lap ghep 1$ch.
- Be m?t tiep diem bi oxy h6a do xam thl/c cua moi tr- crng lam vi$c ( c6 h6a chat, gm - at vv .. .
- Do h�u qua cua vi$c xuat hi$n dong di$n ngan m?ch m9t pha voi "dat" ho?c dong ngan m?ch hai pha 6 phfa sau cong tac to, khdi d9ng tu' vv .. .
❖ Hi�n tli(jng hu hong cuc;m day (cuc;m hut) ► Nguyen nhan:
- Ngan m?ch Cl;IC b9 giG'a cac vong day do each di$n xau.
- Ngan m?ch giG'a cac day dan ra do chat I- «;1ng each di$n xau hO?C ngan m?ch giG'a day d§n va cac vong day quan do d?t giao nhau ma khong c6 16t each di$n.
- 8Crt day quan.
- 8i$n ap tang cao qua di$n ap dinh mCi'c cua cu9n day. - each di$n cua cu9n day bi pha hong do bi va d�p co khf.
- each di$n cua cu9n day bi pha huy do cu9n day bj qua n6ng ho?c v1 tf nh toan cac thong so quan l?i sai ho?C di$n ap cu9n day bj nang cao qua, ho?c 16i thep hut khong hoan toan, ho?C dieu ch1nh khong dung hanh tr1nh 16i thep.
- Do n- oc emunxi, do muoi, dau, khf h6a chat cua moi tr- crng am thl/c lam ch9c thung each di$n vong day.
4.5. Siia chlia Contactor.
❖ Bi�n phap slia chua:
► LI/a ch9n khf Cl;! di$n phai dung cong suat, dong di$n, di$n ap va cac che d9 lam
vi$c t- ong Ci'ng.
► Kiem tra va sU'a chG'a nan th�ng, ph�ng gia dB tiep diem, dieu ch1nh sao cho trung
khop hoan toan cac tiep diem d9ng va tinh cua Contactor.
► Kiem tra l?i lo xo cua tiep diem d9ng xem c6 bi meo, bien d?ng hay d?t 1$ch tam khoi chat giG'. Phai dieu ch1nh dung 11/C ep tiep diem (c6 the dung 11/c ke de kiem tra).