BI 3: CC PHNG PHP KHI NG NG C 3 PHANI DUNG BI HC1. 2. 3. 4. 5. 6. 7. 8. 9. GII THIU CHUNG KHI NG TRC TiP B KHI NG KIU SAO TAM GIC B KHI NG KIU IN TR S CP B KHI NG KIU BIN TH T NG B KHI NG KiU IN TR TH CP B KHI NG BNG VAN BN DN VN KHI NG C TI KT LUNNUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG1. GII THIU CHUNG 1.1. C S CA DNG KHI NGKhi mt ng c ln c khi ng, du no la ng c mt chiu hay xoay chiu se s dng mt dng in ln cung cp mt m men quay ln co th quay phn tai kt ni vi no. Dong in nay lam cho li in co th st ap anh hng h thng li in cp va c th la nguyn nhn pha hong phn ai truyn ca ng c, Vi vic s dng b khi ng ng c, ta co th giam thiu dong khi ng ln ca ng c gy ra.NUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG2. KHI NG TRC TIP 2.1. S
Mch ng lcN Contactor 3-phase Motor
L1L2
L3 Motor Circuit Breaker Thermal Overload UnitNUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG2. KHI NG TRC TIP 2.1. S
Mch iu khinA Overload Contact Start Button Contactor N Coil
Control Circuit Breaker
Stop Button Hold-in Contact NUE046 - Alternating CurrentMachines
BI 3: CC PHNG PHP KHI NG2. KHI NG TRC TIP 2.1. S
S mch
NUE046 - Alternating Current Machines
c tnh ng c 3 phaCurrent - Speed
c tnh ng c 3 pha
Speed - Torque
BI 3: CC PHNG PHP KHI NG2. KHI NG TRC TIP 2.2. GII THCH
S mchNhn nut Start khi ng. Cun ht Contactor MC/4 c ong in lam cho cac tip im MC.1, MC.2 va MC.3 ong. ng c hoat ng. Cng tc gi MC.4 cung c ong cho phep nut khi ng co th c nha ra v vi tr ban u Nhn nut Start khi ng. Cun ht Contactor MC/4 c ong in lam cho cac tip im MC.1, MC.2 va MC.3 ong. ng c hoat ng. Cng tc gi MC.4 cung c ong cho phep nut khi ng co th c nha ra v vi tr ban uNUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG2. KHI NG TRC TIP 2.3. NG DNGu im -To c Moment quay khi ng ln -n gin v tng i r tin so vi cc phng php khc Khuyt im -Dong khi ng ln, nguyn nhn chinh gy hin tng sut ap trn li in -Co th lam nhiu h thng ngun cp -Gy sc lc trn khung, truc va b truyn ng cua ng c -Xut hin lc c hoc vao trong dy qun cua ng c ng dung - Trong cac ng dung co lc quan tinh nho nh la: bm ly tm, tin, may khoan cn, may mai, NUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG3. KHI NG SAO/TAM GIC 3.1. S
Mch ng lcL1 L2
Line Contacto r
6-terminal Cu u ni
STAR Contacto r
L3
Overload Unit
Interlock DELTA NUE046 - Alternating Current Khoa lin ng Contactor Machines
BI 3: CC PHNG PHP KHI NG3. KHI NG SAO/TAM GIC 3.1. S
Mch iu khinContactor chnh
Timer
Star OFF Timer Contacts Delta ONInterlock ContactsNUE046 - Alternating Current Machines
KM Star
KM Delta
Hot ng mch iu khinStar-Delta Starter - Control
Line Timer
Star DeltaElectrical - Department
Hoat ng mach iu khinStar-Delta Starter - ControlLine Timer
Star Delta Motor starts in STAR
Hoat ng mach iu khinStar-Delta Starter - ControlLine Timer
Star DeltaElectrical - Department
Hoat ng mach iu khinStar-Delta Starter - ControlLine
Timer
Star
Delta
Electrical - in DELTA Motor runsDepartment
HOT NG MCH NG LC.Star-Delta Starter - PowerLine ContactorL1 L2
6-terminal Motor
STAR Contactor
L3
Overload Unit DELTA Contactor
Mechanical InterlockElectrical - Department
Hoat ng mach ng lcStar-Delta Starter - PowerL1 L2
L3
Contactor CHNH v SAO ong
ng c khi ng kiu ni sao
Contator tam giac m. Electrical - Department
Hoat ng mach ng lcStar-Delta Starter - Power
L1 L2
L3
Contactor Chnh v Tam gic ong ng c khi ng kiu ni tam gic Contator sao m.
3-phase Motor StartersStar-Delta Starter
3-phase Motor StartersStar-Delta Starter
3-phase Motor StartersStar-Delta Starter
3-phase Motor StartersStar-Delta Starter
Dong in tng ln theo ng c tnh khi ng.
Dong in giam xung gia tri inh mc theo ng c tnh khi ng trc tip
K M saom, KM tam giac ong, C tip tc khi ng ch ni tam giac
{
3-phase Motor StartersStar-Delta Starter
Qua m
Transition Surge
ng c h mach
{
3-phase Motor StartersStar-Delta Starter
Khi KM tam giac ong, m men tng ln gia tri ca khi ng trc tip
M men sao = 1/3 m men tam gic
3-phase Motor StartersStar-Delta Starter
M qua co ngha la tai thi im o ng c h mach, khng ni vi ngunKt qua la tao ra dong ln va m men tng ln.
3-phase Motor StartersStar-Delta Starter
Hu ht cc b khi ng bng cch gim in p l khng ngt ng c khi chuyn i, gi nguyn dng v m menB khi ng o gi la Qua ong
BI 3: CC PHNG PHP KHI NG3. KHI NG BNG I NI SAO/TAM GIC 3.3. NG DNGu im Gim dong khi ng gim i mt phn ba so vi phng php khi ng trc tip D.O.L. Chi khng t hn khi so sanh vi cac phng phap khi ng lam gim in ap khac Khuyt im Lam gim m men khi ng i mt phn ba so vi m men u ti, iu nay cho phep s dung phng phap nay khi ng ng c vi ch ti trong nho Xut hin nhiu trn ng dy khi chinh li t ch Sao thanh Tam giac (Loi chuyn h) ng dung S dung phng phap nay khi ng ng c di ch NUE046 Alternating Current khng ti nh la bm, cac may-Machines nghanh g trong
BI 3: CC PHNG PHP KHI NG4. KHI NG DNG IN TR S CPPrimary Resistance Starter B khi ng dung in tr s cp Thm vo phn tnh b in tr khi khi ng.
Khi ng c hoat ng se loai dn in tr cho n khi ht..NUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG4. KHI NG DNG IN TR S CP 4.1. S
Mch ng lcN L1 L2 L3 Circuit Breaker Contactor chnh
in tr gii han dong
Thermal Overload Unit
3-phase Motor
Khi khi ng, cc in tr mc ni tip vi cc cun dy ng c. NUE046 - Alternating CurrentMachines
Primary Resistance Starter B khi ng dung in tr s cpN L1 L2 L3
Contactor chnh
in tr gii han dng
3-phase Motor
Circuit Breaker
Thermal Overload Unit
Khi chy, Contator s ngt in tr ra khi mch .
Contactor chay
BI 3: CC PHNG PHP KHI NG4. KHI NG DNG IN TR S CP 4.1. S
Mch iu khinA N Line
Timer
Run
NUE046 - Alternating Current Machines
Primary Resistance Starter B khi ng dung in tr s cpContactor chnh in tr gii han dong
N L1 L2 L3
3-phase Motor
Circuit Breaker Circuit Breaker closed
Thermal Overload Unit
Contactor chay
Primary Resistance Starter B khi ng dung in tr s cpin tr gii han dong 3-phase Motor
N L1 L2 L3
Line Contactor
As motor Line Contactor Closed. Motor starts with current reduced Motor accelerates smoothly Resistor resistors by series voltage drop decreases motor voltage steadily rises Motor voltage rises
Thermal Motor Overload Circuit rises, speed Breakercurrent falls Unit
Khi chuyn i, in p ng c gn ti in p nh mc.Run Contactor
Primary Resistance Starter B khi ng dung in tr s cpN L1 L2 L3
Line Contactor
Current-Limiting Resistances
3-phase Motor
Motor Circuit Breaker
Thermal Overload Unit
Contactor chay ong. ng c gi nguyn u ni ng c (qua vi in vi ngun chay ong)ap inh mc.
Run Contactor
Primary Resistance Starter B khi ng dung in tr s cp
A
N Line
TimerRun
Primary Resistance Starter B khi ng dung in tr s cp
A
N Line
TimerRun
Primary Resistance Starter B khi ng dung in tr s cp
N L1 L2 L3
Line Contactor
Current-Limiting Resistances
3-phase Motor
Motor Circuit Breaker
Thermal Overload Unit
Run Contactor
Primary Resistance Starter B khi ng dung in tr s cp B khi ng vi in tr s cp dng loi in tr lng tt hn l loi in tr kim loi. Dng in ng c chy qua in tr s lm nhit in tr tng ln, gim gi tr in tr, gim in p trn in tr, => in p ng c tng ln. Dung dch in phn ny c lin quan n dung dch kim. Nng ca dung dch ph thuc vo dng khi ng ca ng c.
BI 3: CC PHNG PHP KHI NG4. KHI NG DNG IN TR S CP 4.4. NG DNGu im Gim dong khi ng (phu thuc vao in ap ri qua cac in tr) Tng tc trn tru khi tc tng dn Khuyt im M men khi ng nho (phu thuc vao in ap ri qua cac in tr) Hiu sut thp, vi mt nhiu nng lng trong cac in tr luc khi ng t tin Dong khi ng ln hn so vi phng phap Sao/Tam giac ng dung NUE046 - Alternating Current - Qut, bm ly tm, Machines
BI 3: CC PHNG PHP KHI NG5. KHI NG DNG BIN P T NGThng qua BATN se giam in ap cp vao cun dy ng c khi khi ng.
Khi ng c at tc , bin ap se c ct ra khoi mach in.
NUE046 - Alternating Current Machines
Autotransformer Starter
Mach ng lcN L1 Line Contactor L2 3-phase Motor L3 Autotransformer
CB
O.L
ContactorChay
Contactor ni sao BA
Autotransformer Starter
Khi ng bng bin ap t nguAutotransformer N L1
Contactor chnh
BA T ngu 3-phase Motor
L2L3
CB
Thermal Overload Unit
Contactor ni sao BA
Cac b khi ngAutotransformer Starter Khi khi ng,khi ng vi in p nh hn nh ng c Contactor chnh v ni sao BA ng N Line mc thng quaAutotransformer bin pContactorL1 3-phase Motor
L2
L3
CB
Thermal Overload Unit
Contactor ni sao BA
Cac b khi ngAutotransformer Starterng c tng tc gian, contactor ni sao BA m Sau 1 thi vi in p gimN Line Contactor L1 3-phase Motor Autotransformer
L2
L3
CB
Thermal Overload Unit
Contactor ni sao BA
Cac b khi ngAutotransformer StarterDong in ng c c gi nguyn thng qua ng c gi nguyn u ni vi ngun tr khang BAN Line Contactor L1 3-phase Motor Autotransformer
L2
L3
CB
Thermal Overload Unit
Contactor ni sao BA
Cac b khi ngAutotransformer StarterN
Lc ny, ng c c nichy ng, BA c ni Sau 1 thi gian, contactor trc tip vi ngun Line tt. AutotransformerContactor3-phase Motor
L1
L2
L3 CB Thermal Overload Unit
Contactor chay
Contactor ni sao BA
Mach iu khin Control Circuit
CB
T.O/L
Stop
Start
K1M
Contactor chnhTimer
K1M
K4T K3M
K4T.1
K2M
Contactor ni sao BA
K4T.1
K2M
K3M
Contactor chy
Cac b khi ngAutotransformer Starter Control CircuitCB T.O/L Stop Start K1M
Contactor chnhTimer
K1M
K4T
(CB closed) When Start is pressed, Line (K1M),, Transformer Star (K2M) contactors and Timer (K4T) energise.
K4T.1
K3M
K2M
Contactor ni sao BA
K4T.2
K2MInterlock OPENS
K3M
Contactor chy
Cac b khi ngAutotransformer Starter Control CircuitCB T.O/L Stop Start K1M
Contactor chnhTimer
K1M
K4T K3M
Khi r le thi gian tac ng, contactor ni sao m, contactor chay ong lai
K4T.1
K2M
Contactor ni sao BA
K4T.1
K2M
K3M
Contactor chy
Interlock OPENS
Cac b khi ngAutotransformer Starter
Mt s t l ca may bin ap : 80% , 60%, 50% Dong khi ng ca ng c:
I Motor I DOL ratioI Line I DOL ratio2
T l MBA
Dong khi ng ca ngun cung cp :
Cac b khi ngAutotransformer Starter
Dong in va m men ng c c gi tng i cao.
BI 3: CC PHNG PHP KHI NG5. KHI NG DNG IN TR S CP 5.4. NG DNGu im Cung cp la chn cc gi tr m men quay khi ng C th khi ng ng c chy vi ti trng tng i nng C mt di la chn cc in p Khuyt im
Cc chi ph lc u cho cc thit b bn ngoi rt tng dung Bm thy lc, Bng ti,... - Alternating Current NUE046Machines
BI 3: CC PHNG PHP KHI NG6. KHI NG DNG IN TR TH CP
Stator
Chi than se tip xuc vi c gop tao dong in chay bn trong cun dy. Cac cun dy c ni sao vaNUE046 ra c gop. a - Alternating CurrentMachines
Rotor dy qun
Cac b khi ngSecondary Resistance Starter Dung in tr ph cho Rotor. Cun dy Stator ni trc tip vi ngun. Dung b in tr ph thm vao cun dy Rotor Khi ng c chay, in tr ph se c loai bt dn cho ti ht.
NUE046 - Alternating Current Machines
Cac b khi ngSecondary Resistance Starter Cun dy Stator ni trc tip vi ngun.N L1 L2
Line Contactor
3-phase Motor
L3
Motor Circuit Breaker
Thermal Overload UnitNUE046 - Alternating Current Machines
Secondary Resistance StarterPower Circuit Starting Mach ng lcContactor chnhN L1 L2
Motor
in tr ph bn ngoi
L3
CB
O.L
NI VI C GP.
NUE046 - Alternating Current Machines
Secondary Resistance Starter Power Circuit Accelerating Khi ng Tng tcin tr ph bn ngoi
N L1 L2 L3
Contactor chnh
Motor
CB
O.L
Step 2
Step 1
Contactor tng tcNUE046 - Alternating Current Machines
Secondary Resistance Starter Control CircuitCB T.O/L Stop Start K1M Line Contactor Step 1 Timer
K1M
K4T
K4T
K2M
Step 1 Contactor
K5T
Step 2 Timer Step 2 Contactor
K5T
K3M
NUE046 - Alternating Current Machines
Squirrel Cage / Wound Rotor
So sanh m men khi ng gia C rotor lng soc va dy qun
Double (High/Low) Standard Wound Rotor Squirrel Cage
NUE046 - Alternating Current Machines
Cac b khi ngSecondary Resistance Starter Speed / Torque Acceleration
NUE046 - Alternating Current Machines
Tng kt phn cac b khi ng Co 3 loai khi ng ng c Khi ng trc tip Gim in p khi khi ng Khi ng dng in tr phNUE046 - Alternating Current Machines
Giam in ap khi khi ng Sao tam gic Dung in tr s cp Dung bin ap t ngu Dung in tr ph vao mach Rotor
NUE046 - Alternating Current Machines
u khuyt im ca cac b khi ng. Khi ng trc tip u im: M men m my ln nht m gin v tng i re tin so vi cc phng php khi ng khc
Khuyt im: Dng khi ng ln nh hng ti cc phn c kh nh hng ti cc ph ti khc v ngun cung cpNUE046 - Alternating Current Machines
Khi ng Sao Tam gic u im: Gim dng khi ng xung cn 1/3 dng khi ng trc tip Tng i re tin
Khuyt im: M men khi ng gim cn 1/3 Ch khi ng mang ti trc tip cho ti nh
ng dng: dng cho cc ng c khi ngkhng ti hoc ti nh ( qut gi, my ca..v.v)NUE046 - Alternating Current Machines
Khi ng dung in tr s cp u im: Gim dng khi ng Tng tc m
Khuyt im M men khi ng thp Tn tht cng sut trn in tr t tin
ng dng : qut bm.v..v
NUE046 - Alternating Current Machines
Phng phap khi ng ng c dung bin ap t ngu u im Cung cp la chn cc gi tr m men quay khi ng C th khi ng ng c chy vi ti trng tng i nng C mt di la chn cc in p
NUE046 - Alternating Current Machines
Phng phap khi ng ng c dung bin ap t ngu Nhc im: Cc chi ph lc u cho cc thit b bn ngoi rt t ng dng: Bm thy lc, Bng ti,...
NUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG6. KHI NG DNG IN TR TH CP 6.4. NG DNGu im c tnh k thut m men khi ng hon ho Tng tc trn trong sut qu trinh khi ng Kh nng khi ng ng c vi ti trong ban u ln Khuyt im Yu cu thm cc cng tc bo tri bo dng u t ban u ln ng dung -Dng cho cc ti c qun tnh ln nh l my nen, my ct t,
NUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG7. B KHI NG DNG VAN BN DNTham kho thm t sach bai hoc
NUE046 - Alternating Current Machines
BI 3: CC PHNG PHP KHI NG8. KT LUN
C 3 loai khi ng ng c Khi ng trc tip Gim in p khi khi ng Khi ng dng in tr phNUE046 - Alternating Current Machines
Giam in ap khi khi ng Sao tam gic Dung in tr s cp Dung bin ap t ngu Dung in tr ph vao mach Rotor
NUE046 - Alternating Current Machines