Chuong_6_-_TRANSFORMER.pdf

7/23/2019 Chuong_6_-_TRANSFORMER.pdf

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K thut inGV: NG TUN KHANH 1

Company

LOGO

K THUT IN

GV :NG TUN KHANH

i hc quc gia Tp.HCM

Trng i hc Bch Khoa Tp.HCM

1

Chng 6

MY BIN P

2

6.1 Khi nimchung

6.2 CutoMBA

6.3 Nguyn l lm vic

6.4 Cc phngtrnh MBA

6.5 Mchtng ngMBA

6.6 Chkhng ticaMBA

Chng 6

3

6.7 Ch ngn mch caMBA

6.8 Chc ti

6.9 MBA 3 pha

6.10 MBA c bit

6.1. Khi nim chung

4

nh ngha

Hnhnhminh ha

Cci lng nh mc

Cngdng

nh ngha

5

Mybin p lthit b in tnhbin i in nng t mch

inc inp U1-I1sangmch inc U2-I2da vo nhlut cmng in t.

Phnbitphas cpv phath cp

Hnh nh minh ha

6


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Hnh nh minh ha

7

Hnh nh minh ha

8

Hnh nh minh ha

9

Cc i lng nh mc

10

1 21 2dm dm d dmm dmS U I U I

Cng dng ca MBA

11

Dng tng in p t my pht in ln ng dy tiin ixa vgim inp cui ngdycungcpchoti.

Dng trong cc l nung, hnin, o lng hoclmngunincho ccthit b in, in t

6.2. Cu to ca MBA

12

Mybinpgmhai thnhphnchnh:

Li thp(mch t)

Dy ng (cundys cpvth cp)


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Li thp

13

Li thpcu thnhnhiu l thpk thut in. Thpk thutin chahmlng Silicthay i t 1% 4 % nhm tngkh nng dn t thng,gim chu trnh t tr v tn hao lithp

Cc l thp thngthngdyt 0.35mm 0.5mm

Davokiu mchthay li thp m ta c 2loisau:

Loi tr: t dng v sinh ra t tn nhiu dn n st pcao.

Loi bc: thngdng, cc dy qun c qun ngtm.

Dy ng

14

DyqunMBAclmbng ng hoc nhm. Ctit dintrnhoc hnh vung hoc hnhch nht, bn ngoi c bc cchin.

Tit din dy hnh vung hoc hnhch nht dng cho MBAnh. V s khi NM loi ny d b bin dng. Trong khi tit dintrn thn.

Lm mt MBA: khng kh, du, cn thit s lm mt cngbcthm

6.3. Kh nng ti

15

Khngti:

6.3. Kh nng ti

16

Cti:

1

1

1

TT

dm

SK

S

nh mc

Quti

Nonti

6.3. Kh nng ti

17

Cti nh mc:

6.4. Cc nh lut in t

18

Quytcbn tayphi:


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6.4. Cc nh lut in t

19

Tthng: Khi A c hnhdng bt k

Khi A lmt phng

cosBA

cos

A

d B dA

d B dA

BdA

Cc khi: 1 BA

6.4. Cc nh lut in t

20

Tng ng mch invmch t:

lR

A

1

Fe

l

A

T tr:

in tr :

6.4. Cc nh lut in t

21

nh lut AMPERE:

1

n

j

jC

H dl i

6.4. Cc nh lut in t

22

nh lutAMPERE:

DnginI qua N vngdyqun trn mch ts torasut t ng:

F NI

1

Fe Fe

l BI F AB l Hl

A

Miquanh:

6.4. Cc nh lut in t

23

nh lut cm ng in t:T thng xuyn qua vng dytit din A bin thin theo thi gian th hnh thnh trnvng dy ctit dinA mt sc in ng cm ng.

de

dt

Khi c mt vng dy:

Khi c N vng dy:

de N

dt

6.4. Cc nh lut in t

24

nh lut Lenz: Nu sc in ng cm ng to cdng in c

m ng th dng in ny to ra cch quc khuynh hng i khng vi nguyn nhn ban u

sinh ra n.

d

e Ndt


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6.5. Trng thi khng ti

25

Qu trnhin t:


26

Dngin cungcp cho cun s cp: 0 co s( )mi I t

Theo nh lutAMPERE sc t nghnh thnh:

0 0 cos( t) cos( t)

m mF Ni N FI

Sc t ng sinh ra t thng trong mch t, theo nhlutOhm trongmch t:

00 cos( t) cos( t)m

mF F


27

Sc in ng hnh thnh trong dy qun s cp:

01

1

1 1

1 1

cos( t)

sin( t) sin( t)Em

m

m

dde N N

dt dt

Ne

Tng t sc t ng hnh thnh dyqun th cp:

22 sin( t)me N

Bin: 1 1E m mN

Tr hiu dng:

111 1E

E 4.442 2

mmm

Nf

2 2E 4.44 mf


28

11 sin( t)me E

22 sin( t)me E 0

0 cos( t) si 90( t )

m m

Quanhgc phasc in ng vt thng


29

T smybinp: 1

2 1

1

2

2T

E NK

N IE

I

S tng ng:


30

Gin vecto:

Cc phng trnh cn bng dng p pha s cp

1 C XC mE R I jX I

10 C XI I I

1 101 1 1dm tU E R jX I


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31

Gin vecto:


32

Gin vecto:

1 101 1 1dm tU E R jX I

6.6 Th nghim khng ti

33

H mch phth cp Cp in ps cp ng nh mc o dng p cng sutphas cp

Gi thit n gin tnh ton: B qua nh hng R,Xcun s cp, tnhao li thpph thuc vo pnguncungcp,dng I10vokhong3% 5% I 1dm


34

Theogi thuytth ta cs tng ng mi:

Mctiu thnghimkhngti: Xcnh: Rc v Xm Xcnh tnhaost t: PFe Xcnh gn ng t smybinp: KT Xcnh h scngsutkhngti: PF0


35

Cngthctnh:

2

1

0

dmC

UR

P

1dmC

C

UI

R 2 210X CI I I

1dmm

X

UX

I

0

00 1

cos P

I U 1

20

dmU

KU

6.7 Trng thi mang ti

36


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37

S tng ng:


38

Ccphng trnh cnbngp - dng:

1 11 1 1dm tU R jX I E

1 C XC mE R I jX I

10 C XI I I

2 2 22 2tE R jX I U

22 LU Z I

S cp: Th cp:


39

Quii mch th cpsangmch s cp:


40

C squii: QUII DNG P TNGTR

Quii p haysc in ng da vo t s my bin

p

'2 2E K E

Yucu:

Ta c:

Suy ra:

'2 1E E

1

2

EK

E


41

C squii: QUIIDNG P TNG TR

Quii dngda vo phng trnh cnbng tthnghaysc t ng

T phng trnh cnbng tthng: 0 1 2

T phng trnh cnbng tthng: 0 1 2F F F

1 1 2

2

1 1

2

10 1 2

2 2 '10 1 2 1 1 1 2

I I I

I II I I

N N N

N

N KI I I I

N

N


42

C squii: QUII DNG P TNG TR

Quii tng tr da vo yucu ng dng ca ccphng trnh cn bng p pha th cp trc v sau

khi quii. 2 2 22 2tE R jX I U

2 2 22 2

2 22 2

2 2

'2

'2

' ' ' '

2 2

'2 22

2

2

2

2

2

t

t

t

t

K K K

K K K

K K

I

I

E R j

E R jX I U

E R jX U

E K K

I

R U

X U

j X


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43

S tng ngquivphias cp:


44

S tng ng qui v phias cp: Khi xemtn haothp ph thuc vo ngun p s cp v c lp vi tngtr ca ti

6.8 Th nghim ngn mch

45

Ngn mchph th cp Cp in ps cpsao cho dngs cp ng nh mc o dng p cng sutphas cp

Gi thit n gin tnh ton: B qua nh hng tnhao li thp b qua mch t R c, Xm, p ngn mchUNMvokhong5% 10% U1dm


46

Theogi thuytth ta cs tng ng mi:

Mctiu thnghim ngn mch: Xcnh: Rn v Xn Xcnh tnhaong nh mc: PCu Xcnh gn ng t smybinp: KT


47

Cngthctnh:

2

1

nn

n

PR

I

1

1

nn

n

UZ

I

2 2

n n nX Z R

1cos

n

nn

P

I U

6.9. Gin nng l ng v hiu sut

48


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6.9. Gin nng lng v hiu sut

49

Cngthctnhhiu sut: 2 2 2 21 1 1 1

coscos

P U IP U I

Cngthckhc:

2 2

1 2 0 1 2j j

P P

P P P P P

2 2 2 2

1 2 2 2 0 1 2

2 2 2

1 2 2 0 1 2

cos

cos

cos

cos

j j

j j

P U I

P U I P P P

P S

P S P P P

6.9. Gin nng lng v hiu sut

50

Thugn tnhaong:

2 2

1 2 1 1 2 2j jP P R I R I Tn haong:

H s ti: 1 2 2

1 2

T

dm dm dm

I I SK

I I S

Suy ra: 2 2 2 21 2 1 1 2 2j j T dm dm T nP P K R I R I K P

6.9. Gin nng l ng v hiu sut

51

Hiu sutl hmca KT : 2 22 0

coscos

dm

d

T

m nT T

SS P P

KK K

0T

n

PK

P

52

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Chuong_6_-_TRANSFORMER.pdf