Nha May Dien Tram Bien AP-06

8/2/2019 Nha May Dien Tram Bien AP-06

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Ch ng 7: MAY CAT VADAO CACH LY

02 Jan 2011 401019 Nh my in v trm bin p


2/19

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I. Ho quang khi cat mach ien

1. S hnh thanh ho quang:

Khi au tiep xuc m ra, cng o ientrng trong khe h rat ln.

Khi cat, t nhieu phat sinh ho quang.Neu ho quang khong c nhanh chong dap tat,co the dan en h hong thiet b.

+ _+

+-

- +

+

-

-



3/19

3

1. S hnh thanh ho quang

Ho quang van duy tr do:

Hien tng phat xa nhiet ien t am cc

Hien tng ion hoa do va cham

Hien tng ion hoa do nhiet o cao



4/19

4

2. Hien tng kh ion

Trong khe h gia cac au tiep xuc con quatrnh lam mat phan t mang ien goi la kh ion

Hien tng ket hp ion

Hien tng khuech tan ion



5/19

5

3. Hien tng kh ion cac ien cc va s phanbo ien ap tren ho quang:

a) Kh ion catot: Ion dng chuyen ong vecatot, tao thanh ien tch khoi dng gan catot

Catot

+

+

+

+

+

+

+

+

+

++

So ien t ban ra tcatot ln, chungchuyen ong veanot, gap ion,chung ket hp vinhau, lam cho phant mang ien gancatot giam xuong,

Uc=10-20V

ien trngln

Phat xaien t



6/19

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b) Kh ion anot:

Cac ion am va ien t chuyen ong ve pha anot

Do tnh linh hoat cua ien t, khi cac ion am tigan anot, ien t chung se tach ra, chay nhanh vao

anotSo phan t mang ien gan anot giam xuong, gayra ien ap giang anot Ua



7/19

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Khu vc gia anot va catot, co s phan bo cacphan t mang ien tng oi ong eu nen sphan bo ien ap va t trng giong nhau:

ien ap giang tren cot ho quang Uchq phu thuocvao chieu dai ho quang

achqchq UUUU +ien ap ho quang Uchq gom 3 phan:



8/19

8

4. ac tnh V-A cua ho quang:

Ton tai gii han e ho quangbac chay Uc

ihq

uhq

ng ac tnh khong ongnhat chieu tang va giam dong

ien

ac tnh V-A cua ho quang phuthuoc vao chieu dai ho quang

ac tnh V-A cua ho quang phu thuoc vao moitrng kh trong khong gian gia hai ien cc



9/19

9

5. Ho quang ien mot chieu:

a) ieu kien chay va dap tat ho quang mot chieu:

R

L

A

C

U

+

_

ihq

uhq

+

_

Phng trnh can bang ap:hq

hq

hq udt

diLRiU +

HQ chay on nh: 0dtdihq

=hqhq uRiU +

Khi trong mach xuat hien s dao ong cua ihq,ngay lap tc trong mach se xuat hien sc ien

ong Ldihq/dt02 Jan 2011 401019 Nh my in v trm bin p


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6) Ho quang ien xoay chieu:

a) ac tnh ho quang AC:

UC

Ut

t1 t2

Ung

ihq

Uhq



11/19

11

II) May cat ien:

1) Nhiem vu va cong dung:ong cat mot phan t cua he thong ien (may phat,MBA, ng day, ) luc lam viec bnh thng cungnh luc s co.

MC Tai

Ngan mach



12/19

12

Yeu cau oi vi may cat ien:

Cat nhanh, am bao khi ong cat khong gay no va chay

Co the ieu khien tai cho, ng cach va t xa.

Co kha nang ong cat lap lai.

Kch thc gon nhe

Gia thanh ha



13/19

13

Cac ai lng ac trng:

ien ap nh mc

Dong nh mc

Dong ien cat nh mc, dung lng cat

Dong ien on nh ong nh mc

Dong ien va thi gian on nh nhiet nh mc



14/19

14

Cac ieu kien chon la MC:

- UmMC

Um

- Im Icb

- Icm IN

- i.m ixk

NnhdmnhdmBtI



15/19

15

III) Dao cach ly:

1) Nhiem vu:DCL tao ra khoang cach trong thay c e ambao an toan khi sa cha MP, MC, D

DCL ong khi khong co dong hoac dong nho



16/19

16

Cat dong khong tai cua ng day ngan va cacMBA cong suat nho.ong cat phu tai ti 10-15 A cua cac mach co Umti 10 kV

ong, cat dong can bang

ong, cat may bien ien ap



17/19

17

2) Phan loai DCL:

DCL kieu quay hai tru

DCL kieu quay 3 tru

DCL kieu quay 1 tru, tiep iem ong m.

DCL hai tru ng, cat gia.

Dao noi at 1 tru.



18/19

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3) Bo phan truyen ong cua DCLva dao noi at:

La c cau e ong m va duy tr cac v tr cuachung Bo phan truyen ong bang tay co cau truc ngian, chac chan, ni khong can ieu khien t xa. Bo truyen ong ong c co cau tao phc tap attien hn, ni can ieu khien

Trong bo truyen ong can co tiep iem phu dung

cho mach bao tn hieu ong m, dung cho machkhoa lien ong thao tac nham lan.



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4) Cac ieu kien chon la DCL:

UmMC Um

Im Icb

i.m ixk

Nnhdmnhdm BtI


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Nha May Dien Tram Bien AP-06