Module 4_Mo Hinh May Bien AP

7/29/2019 Module 4_Mo Hinh May Bien AP

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MODULE 4: M HNH MY BIN P TRANG 53

TrngH SPhm KThut TP.HCM

MODULE 4

M HNH MY BIN P


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TRANG 54 MODULE 4: M HNH MY BIN P


Ni dung thc hnh

1. Tm hiu nguyn l hot ng ca cc thit b c trong m hnh.2. Kho st b ngun cung cp.3. Kho st cc dng co.4. Kho st m hnh my bin p 1 pha 3 pha ch khng ti.5. Kho st m hnh my bin p 3 pha mang ti tr.6. Kho st m hnh my bin p 3 pha mang ti cm.7. Kho st m hnh my bin p 3 pha mang ti dung.8. Kho st m hnh my bin p ch ngn mch.

Cc thit b c trong m hnh:

1. Variac 3 pha.

Hnh: M hnh my kho st my bin p

1

4

3 32

5

6


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2. My bin p 3 cun dy.3. ng ha nng MFM384C4. Ti thun tr.5. Ti thun cm.6. Ti thun dung.

BI 4.1: KHO ST CC THIT B V DNG CO

A. MC TIUSau khi hc xong bi ny, sinh vin c kh nng:

- Xc nh c cc thit b c trong m hnh my bin p.- Trnh by c nguyn l hot ng ca cc thit b c trong m hnh.- Hnh thnh tc phong cng nghip, m bo v sinh v an ton lao ng.B. NI DUNGI. Varia 3 pha

To ngun 3 pha dao ng t 0 400 V cho m hnh th nghim.

Trnh t thao tc:

1. Vn nm xoay (2) theo ngc chiu kim ng h v gi tr zero.

Hnh 4.1.1: Variac 3 pha 0 400 V

1 2

3

4


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2. Bt khi CB (1) cp ngun cho variac 3 pha3. Vn nm xoay (2) theo cng chiu kim ng h tng dn gi tr

in p. ng thi quan st ch s hin th trn cm ng h (3) cho

ph hp vi yu cu bi thc hnh.

4. Khi t c gi tr mong mun, nhn nt Start a ngun ncc u cc L1, L2, L3, N.

5. Khi kt thc th nghim, nhn nt Stop, vn nm xoay (2) v gi trzero v tt khi CB cp ngun cho variac

II. ng ha nng MFM384CXem bi 1.1

III. Ti tr- Ti cm Ti dungCung cp cc ti c tnh cht tr- tnh cm tnh dung cho bi thc hnh.

C. CU HI N TP1. Nu tn, thng s v chc nng ca cc thit b c trong m hnh my bin p?


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BI 4.2: KHO ST MY BIN P CH KHNG TI

I. MC TIUSau khi hc xong bi ny, sinh vin c kh nng:

Xc nh c cc thit b c trng m hnh my bin p. Trnh by c nguyn l hot ng ca cc thit b c trong m hnh. Thc hnh lp rp m hnh, o ly thng s v nhn xt kt qu. Xc nh t s bin i in p ca my bin p vn hnh ch khng ti. Xc nh mc tiu th cng sut tc dng v cng sut phn khng ca my

bin p ch khng ti.

Hnh thnh tc phong cng nghip, m bo v sinh v an ton lao ng.II. NI DUNG THC HINBc 1: Nhn bit cc thit b cn thit cho m hnh th nghim. Cc thit b cho trong

bng sau:

Thit b S lng

Variac 3 pha in p 0 400V 1My bin th 3 pha 1

ng ha nng MFM384C 2

B ni dy an ton cc mu xanh, , vng,

en, xanh lc

B cu ni an ton

Bc 2: B tr cc thit b theo th t nh hnh 4.2.1.

Variac 3 pha

0 400VMFM384C

My bin th

ba phaMFM384C

Hnh 4.2.1. S khi btr cc thit b bi 4.2


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Bc 3: S! dng cc dy ni v cu ni an ton lp rp bi thc hnh theo s"

ni dy hnh 4.2.2.

Bc 4: Vn hnh m hnh, tin hnh o cc thng s v ly kt qu

Cc php o u tin c thc hin trn mt pha ca my bin th, sau nycc kho st s#c thc hin trn 3 pha.

t ngun in p cho Variac 3 pha ti gi tr 220V v gi$ mc gi tr nykhng thay i trong sut thi gian th nghim.

MFM384C

MFM384C

VARIAC3PHA

04

00V

Hnh4.2.2:Mchkhostch

khngticamybinth(u1pha)


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S! dng cu ni la chn in p cho nh$ng gi tr pha th cp ca mybin th: UN + 5%, UN, UN 5%, UN 10%, UN 15%

Lu : Ngt ngun khi thao tc thay i cc nc la chn in p.

o khng ti in p U2 trn cun th cp v xc nh t l bin i thch hp.UN + 5% UN UN 5% UN 10% UN 15%

U1 (V)

U2 (V)

t = U1/U2

Ghi ch: T l bin i in p ghi trn mt ca my bin th ch p dng cho ti vi

dng in 1A pha th cp, v vy khng ph hp vi nh$ng gi tro khng ti.

Tnh ton t s t phn nh gi tr xp x t l s vng dy W1/W2 ti v tr m bi nc

ang s! dng.

Khng thay i bt k mi quan h no trn cun s"cp, s! dng vn k cho cun dy

pha th cp xc nh in p trn cun dy th ba ( ti nh$ng u ra 3U1 3U2).

U3 = V

Thc hin o dng in khng ti v cng sut tc dng tiu th bi my bin th.

Loi b vn k trn cun th cp hn ch sai s ca kt quo.

U1 = V I10 = A P10 = W

V dng in thp trong my bin th chy ch khng ti, nn gn nh khng c

tn tht ng no xut hin. Nh vy, cng sut thc tiu th gn nh ch bao gm tn

tht st. Xc nh coso trn cun s"cp vi biu thc:

xc nh:

IFe = I10.cos0


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Lu : c th s! dng cos0 b%ng ng ho (chp nhn sai s khi o). in trst

t v in khng t ha c thc tnh ton b%ng cch s! dng ph"ng trnh sau:

coso =

IFe = A

I = A

RFe =

Xh =

Thc hin li th nghim khng ti trn nhng i v tr MBA (s"cp thnh th cp

v ngc li nh hnh 4.2.3

UN + 5% UN UN 5% UN 10% UN 15%

U1 (V)

U2 (V)

t' = U1/U2

1/t

V

V

V

ARIAC3PHA0-400V

L1

L2

L3

NPE

Hnh 4.2.3:o tsbin thc thtrn cun thcp


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Kt lun iu g t cc t s my bin th t"ng ng ?

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Phn th nghim tip theo dnh cho c 3 pha ca my bin th, c thc hin

t"ng t cc bc nh th nghim 1 pha . &y ch c cun s"cp c s! dng

cho vic cp in v thao tc ti gi tr UN trn cun th cp.

Mrng mch nh hnh 4.2.4 v o hai in p U1 v U2, Dng in khng ti I10 (sau

khi tch ri vn k trn cun th cp), mc tiu th cng sut tc dng P10.

U1 = V

U2 = V

I10 = A

P10 = W

III. NI DUNG BO CO1. C kt lun g t nh$ng t l bin i t"ng ng ?

...........................................................................................................................................

...........................................................................................................................................

VARIA

C3PHA0-400V

L1

L2

L3

NPE

Hnh 4.2.4: S th nghim cho php o in p, dng in v cng sutch

khng ti ni sao trn cun scp

V

MFM384C


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2. So snh nh$ng gi tro c trong mch 3 pha vi mch 1 pha ?

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BI 4.3: KHO ST MY BIN P CH NGN MCH


Trnh by c s" nguyn l v cch kho st m hnh my bin p chngn mch.

Thc hnh lp rp m hnh, o ly thng s v nhn xt kt qu. Hnh thnh tc phong cng nghip, m bo v sinh v an ton lao ng.

II. NI DUNG THC HINBc 1: Nhn bit cc thit b cn thit cho m hnh th nghim. Cc thit b cho trong

bng sau:

Thit b S lng

Variac 3 pha in p 0 400V 1

My bin th 3 pha 1

ng ho dng in 1

ng ha nng MFM384C 1B ni dy an ton cc mu xanh, , vng,

en, xanh lc

B cu ni an ton

Bc 2: B tr cc thit b theo th t nh hnh 4.3.1

Bc 3: S! dng cc dy ni v cu ni an ton lp rp bi thc hnh theo s"

ni dy hnh 4.3.2.

Bc 4: Vn hnh m hnh, tin hnh o cc thng s v ly kt qu.

Variac 3 pha

0 400VMFM384C

My bin th

ba pha

Hnh 4.3.1. S btr cc thit b bi 4.3

A


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Lu : Vn nm xoay ca variac ba pha v gi tr zero trc khi tin hnh th nghim.

S! dng cu ni chn nc iu p trn cun th nh ti in p danh nh v nin vi u ra.

Tng gi trin p ca variac ba pha bt u ti zero cho n khi dng inmy bin th danh nh t n 1,2A trn cun s"cp. o in p U1kv cng

sut P1ktiu th ca mch.

U1k=V I1 = A P1k= W

Xc nh h s cos, cc in p ngn mch t"ng i c'ng nh thnh phn doin trv do trkhng ngn mch sinh ra theo ph"ng trnh sau:

ur = uk.cos

ux = uk.sin

VARIAC3PHA0

-400V

L1

L2

L3

NPE

Hnh 4.3.2: Ch vn hnh ca my bin thtrng thi ngn mch (kt ni 1 pha)

A

MFM384C


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cosk=

uk= %

ur = %

ux = %

R1k=

X1k=

(Trong cc php o ngn mch nh$ng hiu ng ca in cm t ha Xh v in trtn

tht st l khng ng k)

Khng thay i bt k mi quan h no trn cun s" cp, o dng in ngnmch trong cun dy pha th cp (ti v triu p UN) v s! dng thng s

ny hnh thnh t l bin i dng in.

I1 = A

I2 = A

I1/I2 =

So snh iu ny vi t s bin i in p t"ng ng t php o khng ti

Tr li: ..............................................................................................................................

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M rng mch nh hnh 4.3.3 v tng in p bt u t zero n khi dng in

danh nh l 1,2A

o in p U1kv mc tiu th cng sut thc P1k

U1k= V

I1 = A

P1k= W


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III. NI DUNG BO CO1. So snh nh$ng gi tro c vi cc gi trmch 1 pha ?

...........................................................................................................................................

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2. V# mt s" mch (pha "n) t"ng "ng y ca my bin th v ghi y

tt c cc i lng o c hoc tnh ton ?

I1 =. R1 =. X1 =.

I =.

X =.

X2' =. R2 =. I2 =.

IFE =.

RFE =.

U1 =. U2 =.U1N =.

Hnh 4.3.4: S mch mt pha ca my bin thtng ng sdng trong th

nghim (my bin thni sao)

VARIAC3PHA0

-400V

L1

L2

L3

NPE

Hnh 4.3.3: Php o U,I,P v ni Y trn cun scp v ngn mch cun thcp

MFM384C


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BI 4.4: KHO ST MY BIN P CH MANG TI


Trnh by c s" nguyn l v cch vn hnh m hnh my bin p ch mang ti.

Thc hnh lp rp m hnh, o ly thng s v nhn xt k qu. Hnh thnh tc phong cng nghip, m bo v sinh v an ton lao ng.

II. NI DUNG THC HINBc 1: Nhn bit cc thit b cn thit cho m hnh th nghim. Cc thit b cho trong

bng sau:

Thit b S lng

Variac 3 pha in p 0 400V 1

My bin th 3 pha 1

ng ho dng in 1

Ti tr 1Ti cm 1

Ti dung 1

ng ha nng MFM384C 1

B ni dy an ton cc mu xanh, , vng,

en, xanh lc

B cu ni an ton

Bc 2: B tr cc thit b theo t t nh hnh 4.4.1

Bc 3: S! dng dy ni v cu ni an ton lp rp bi thc hnh theo s" ni

dy hnh 4.4.2.

Bc 4: Vn hnh m hnh, tin hnh o cc thng s v ly kt qu.


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Tt c cc php o c thc hin vi my bin th ni sao sao. Trc ht chng ta

s# kho st trng hp ti thun tr.

VARIAC

3PHA0-400V

L1

L2

L3

NPE

MFM384C

MFM384CPE

Hnh 4.4.2. S kt ni mch kho st ch my bin p c ti thay i.

Variac 3 pha

0 400V MFM384C

My bin th

ba pha MFM384C

Hnh 4.4.1. S btr cc thit b bi 4.4

Ti tr Ti dung Ti cm


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III. NI DUNG BO CO1. in kt quo c bc 4 vo bng sau:R U20(V) U2(V) U (V) I2(A) P1(W) P2(W) P(W) (%)

1

2

3

4

5

6

72. Lp mch t"ng t th nghim trn nhng thay ti tr b%ng ti cm. o ly

thng s v in vo bng sau:

L (H) U20(V) U2 (V) U (V) I2(A)

6.0

4.8

2.4

1.2

1.0

3. Lp mch t"ng t th nghim trn nhng thay ti tr b%ng ti dung. o lythng s v in vo bng sau:

C () U20(V) U2 (V) U (V) I2(A)

2.0

4.0

8.0

16.0

4. Nhn xt kt qu vi ti thun tr, ti cm v ti dung ?...........................................................................................................................................

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Module 4_Mo Hinh May Bien AP