ࡱ> q` ԘbjbjqPqP .::5VDVDVDVD\DTeF:LFLFLFLFLFLFLFPdRdRdRdRdRdRd$fhivdELFLFLFLFLFvdLFLFd2J2J2JLFLFLFPd2JLFPd2J2JYVP\LFF 1䜠VDJ",\4^d0e>\i2Ji$P\P\i^,LFLF2JLFLFLFLFLFvdvd2JLFLFLFeLFLFLFLF$$ Tnh Ton Dy in - Contactor - Circuit Breaker A. Tnh Ton Dy in. I. Thuyt Minh: Chng ta iu thy mt th c in qu trnh chn la dy cp in iu theo kinh nghim. Nhng  lm mt bn thuyt minh d thu hay mt la chn vi nhng dy cp in tng i ln th cn c mt bn tnh ton v a ra nhng thng s im nhn  quyt nh chn ng dy cp in, hng sn xut cing nh thng s yu cu ca sn phm: Cadivi, thnh pht .v.v. Da vo kinh nghim trong qu trnh la chn khi cn lm bo tr in, mnh vit bi ny hy vng cc bn d dng chn la mt kch thc dy dn ph hp nht, tit kim nht c th.  y bn phi bit r dng in mnh ang dn l bao nhiu, hoc theo kinh nghim mnh th 1 Kw/pha tng ng 5 ampe. Nu 3 pha th ly cng sut tng chia 3 ra ri tnh tng t. II. La chn kch c dy dn in:Tnh ton  mng h p (3 pha 380 V, 1 pha 220 V). 1. Theo kinh nghim:Khng tnh ton nhiu, ch theo tiu ch l dng in chy qua dy dn in th chn kch thc cho ph hp. Dy dn thng chn vi tit din d rt ln, phng php ny c dng ph bin nht. - Trong xy dng nh  theo TCXD 25 - 1991: + Dng in lin tc cho php ln nht ca dy dn rut ng c cch in bng v cao su , nha tng hp khi nhit  khng kh l 25oC. Dng in nh mc ca dy chy cu ch ( A ) Tit din rut dy dn ( mm2) Dng in lin tc ln nht cho php (A) Dy chiu sng,dy chnh , dy nhnh trong nh  0,5 6 - 0,75 6 - 1 6 6 1,5 10 10 2,5 15 15 4 25 25 6 35 35 10 60 60 16 90 80 25 125 100 35 150 125 50 190 160 70 240 200 95 290 225 120 340 260 +Dng in lin tc cho php ln nht ca dy dn rut ng c cch in bng v cao su , nha tng hp t trong ng khi nhit  khng kh l 25oC. Tit din rut dy dn ( mm2) Dng in lin tc cho php ln nht (A) Dng in nh mc ca dy chy cu ch (A) Trong ng c 2 dy dn Trong ng c 3 dy dn Trong ng c 4 dy dn Dng trong nh  1 6 6 6 6 1,5 10 10 10 10 2,5 15 15 15 15 4 25 25 25 20 6 35 35 35 25 10 60 55 45 35 16 75 70 65 60 22,5 100 90 80 80 35 120 110 100 100 50 165 150 135 125 70 200 185 165 160 95 245 225 200 200 120 280 255 230 230 Khi s lng dy ti in nhiu hn s qui nh trn cc bng nu trn th iu chnh bng cc h s gim cng  dng in theo cc h s: * Nu 5~6 dy trong mt ng , h s gim cng  l 0,68. * Nu 7~9 dy trong mt ng th h s gim cng  l 0,63. * Nu 10 ~12 dy trong mt ng th h s gim cng  l 0,60. - Trong cng nghip:Chn contactor bng 2 ln dng nh mc ca n. Kinh nghim k thut ca mnh cing n gin thi, ly bng thng s cp ca cadivi :  HYPERLINK "http://www.cadivi-vn.com/HuongDan_vn_daycap_1.asp" \t "_blank" http://www.cadivi-vn.com/HuongDan_vn_daycap_1.asp Sau  ly dng in c sn ca mnh nhn 1,4 ln cho ra dng in trn dy cp => t  chn cp. Nu dn vo mch ng lc nhiu motor qu (dng khi ng ln) th nhn cho 1,6 ln hoc 2 ln ri chn kch thc dy cp (hi xa gi tui lm cch ny). VD: Mt ng c 3 pha 9 Kw => 1 pha 3 Kw, ly cosphi = 0,6 => 23 Ampe => 23 x 2 = 46 Ampe. 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Cng thc: Icatalogue,cadivi= k1* k2* Icp> Itt. Icp: dng in lu di cho php trn dy dn. Itt: cng  dng in tnh ton nh my. k1: H s hiu chnh nhit  ng vi mi trng t dy, cp. k2: H s hiu chnh nhit  ng vi s lng dy cp i chung trong 1 rnh. 2. Theo tnh ton k thut:Da trn cc tiu ch la chn ca cp in Cadivi. hoc theoGIM ST THI CNG V NGHIM THU LP T THIT B TRONG CNG TRNH DN DNG.download HYPERLINK "http://www.mediafire.com/view/?8he7zt8h7mtglla" \t "_blank" Ti y + yu t chn dy cp in : Dng in nh mc.  st p. Dng in ngn mch. Cch lp t. Nhit  mi trng hoc nhit  t. + Dng in nh mc : - Dng in chy trong rut cp th s sinh nhit lm cho cp nng ln. Khi nhit  cp vt qu mc cho php th phi chn cp c tit din rut dn ln hn. - Cc bng v dng in nh mc v  st p sau y da trn : Nhit  lm vic cho php ti a ca rut dn. Nhit  khng kh. Nhit  t. Nhit tr sut ca t.  su lp t (khi chn cp trong t). iu kin lp t. + st p : -Mt yu t quan trng khc phi xem xt khi chn c cp l  st p do tn hao trn cp. st p ph thuc vo: Dng in ti. H s cng sut. Chiu di cp. in tr cp. in khng cp. IEE 522-8 quy nh  st p khng c vt qu 2.,5% in p danh nh. Vi mch 1 pha 220V  st p cho php 5.5V,Vi mch 3 pha 380V  st p cho php 9.5V. Khi st p ln hn mc cho php th khch hng phi chn cp c tit din rut dn ln hn. S tay hng dn s dng ca Cadivi: HYPERLINK "http://www.mediafire.com/view/?qtjhia3oa346wut" \t "_blank" Download   B. Tnh Ton Chn CB - Aptomat. I. Thuyt minh: cing ging phng php trn cing da vo dng in chy qua n. Chn CB 3 pha (400 V, 440 V, 500 V, 600 V, 690 V), 1 pha (220 V, 240 V, 250 V). Bn xc nh chnh xc dng in chy qua CB bnh thng l bao nhiu, dng in qu ti (nu c), dng in ngn mch trn h thng. Kh nng ct dng ngn mch. Chn nhng hng sn xut c uy tn nh: Mitsubishi, LS (LG), Merlin Gerin, Clipsal, Siemen .v.v. II. La chn CB: UmCB> UmL(lun c sn xut vi in p ln hn in p nh my). ImCB>=Itnh ton (la chn ging nh tnh kch thc dy in, tc chnImCB >= 1,4Itt). IcmCB>=Ingn mch (Tnh t im ngn mch tr v ngun). Cng thc nh:Ingn mch= Utb/v3xZn. Dng ngn mch i t im ngn mch n ngun in. 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