ࡱ> QSPq` 1bjbjqPqP .2::VVVVVVV4  ^( ( ( (    +------$hN<QQV     QVV( (   V( V( +  + VV ( R^~  +0   V       QQ        dBdBj$VVVVVV HI: Chng ti c mt  HYPERLINK "http://lehoangjsc.vn/menu-product-1-68-1_hyundai.html" \o "my pht in " my pht in diesel d phng 400kVA v trm bin p 1500kVA c gn t b h s cng sut. Khi mt in lui v my pht hot ng, chng ti phi ngt t b ra khi h thng th my pht mi hot ng n nh c. Nu  nguyn t b th in p giao ng ln xung mnh v my pht t tt. Vy chng ti mun hi t b h s cng sut c nh hng g n hot ng ca  HYPERLINK "http://lehoangjsc.vn/detail-news-view-1-74-18_huong-dan-su-dung-may-phat-dien.html" \o "my pht in " my pht in v cch x l trong trng hp ny l th no?  HYPERLINK "http://lehoangjsc.vn/detail-product-view-1-68-448_hyundai-dhy90kse.html" \o "nh hng ca t b n my pht in"  INCLUDEPICTURE "http://lehoangjsc.vn/upload/HYUNDAI%20DHY90KSE.JPG" \* MERGEFORMATINET  TR LI: Trong li in xoay chiu 3 pha ca mt nh my cng nghip thng thng lun tn ti hai loi cng sut: - Cng sut hu dng (kW) l cng sut sinh ra cng c ch trong cc ph ti. - Cng sut phn khng (kVAr) loi in cm l cng sut v ch, gy ra do tnh cm ng ca cc loi ph ti dy qun nh m t, ballast n cao p& Cng sut ny khng tiu th nhin liu ca ngun in, nhng sinh ra dng in ln lm qu ti dy dn v tng hao ht in nng trn dy dn. Ngi ta loi tr thnh phn cng sut phn khng (loi in cm) ni trn, ngi ta dng t b. Nguyn tc quan trng ca b phn khng bng t l khng c b qu mc, s sinh ra cng sut phn khng loi in dung. Cng sut phn khng loi in dung ngoi cc tc hi ni trn cn tng cng tc hi ca cc thnh phn nhiu sng tn s cao (do dung khng ca t gim i  tn s cao hn). C hai cch b phn khng l: - B chung: mc t b chung cho c h thng ph ti  u ngun bin p (ph bin). - B ring: mc t b song song vi tng ph ti v ng ct cng vi ph ti (ch dng trong trng hp ph ti ln ng k)  HYPERLINK "http://lehoangjsc.vn/detail-product-view-1-68-444_hyundai-dhy55kse.html" \o "my pht in " My pht in diesel cng nghip (MP): MP bao gm hai thnh phn cu to chnh l ng c diesel v u pht in. ng c l thnh phn sinh ra cng sut hu dng (kW) v u pht ngo,. 0 2 246 1UjhkB*Uph*hkB*phjhkB*Uphhk0JB*phjhkUhk hk0J!0 t!& -. 001111gdk1i vic truyn i cng sut hu dng ny, chu trch nhim sinh ra cng sut phn khng. u pht ni chung bao gm 1 phn pht in lc chnh v 1 phn pht in nh  kch t cho phn pht in chnh. u pht in nh thng dng hin nay ly ngun cng sut  kch t dng t chnh ngun in lc chnh, bng cch ni trc tip, hoc thng qua mt cun dy ph. B iu p (AVR) s o din p ra ca stator chnh v iu khiu cng sut kch t theo s : stator chnh- AVR- stator kch t- rotor kch t- b diode quay- rotor chnh. Nhc im ca h thng kch t loi ny l khi in p ra ca stator b dao dng hoc b mo sng th AVR khng th khc phc hon ton s dao ng ny do ngun nui AVR cing chnh l ngun b dao ng. Trong cc h thng pht in ln hn hoc cc trng hp ph ti c bit, ngi ta phi dng mt my pht kch t c lp hon ton vi stator chnh. T b v MP: Trong trng hp b chung v t b nm trn ng cung cp ra ti ca MP, qu trnh xy ra nh sau: MP khi ng  ng ph ti v MP. Tuy nhin ban u cc ph ti m t cha c ng in nn ph ti chnh ch l b t in v mt vi ph ti nh khc. Nh vy ph ti MP lc ny mang tnh in dung (tng t nh trng hp b qu mc ni trn). in dung ny kt hp vi in cm ca stator MP to nn mt mch dao ng LC v sinh ra cc dao ng in p vi tn s cng hng no . Tn s cng hng khng nht thit phi l 50Hz m c th l cc sng hi bc cao hn nh 100Hz, 150Hz,& . Sng hi l cc thnh phn c tn s cao hn tn s chun 50Hz, do chnh u pht, hoc cc ph ti phi tuyn gy ra, t nhiu lun tn ti trn h thng in. Nh ni trn, vi mt MP thng dng, cu to h thng kch t khng cho php loi tr hin tng t dao ng ny, v kt qu l in p ca MP khng n nh c trong phm vi iu chnh ca AVR. Vi my bin p th in cm ca phn li v cng nh (tr trng hp li in vng xa& ) v cng sut ngun gn nh v hn nn cc dao dgn ny khng pht sinh v khng t khuych i ln c. Phng php khc phc trong trng hp ny c th l: - T b chung ch c dng vi bin p, v khng c dng vi MP. - S dng phng php b ring nu bt buc phi b. - S dng MP c h thng kch t c lp. ,1h/ =!"#$% 7Dd(  s A&ÂHYUNDAI%20DHY90KSEMy pht in, my pht in dn dng, my pht in cng nghipyK yK http://lehoangjsc.vn/detail-product-view-1-68-448_hyundai-dhy90kse.htmlyX;H,]ą'c"VP"nh hng ca t b n my pht in"Rg5gRj]fT24'.C5DF;5gRj]fT24'.JFIF``C    $.' 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