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3. B N

3.1 Chc nng ca b n3.2 Phn loi b n

3.3 Cu to ca mt b n thng dng

3.4 Cc thng s k thut ca b n in p v cng sut

th phn b cng nh sng

Hiu sut

an ton v kh nng chng nc v bi Gc bo v

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Ch3. B N

3.1. CHC NNG C BN CA B NB n l tp hp cc thit b quang, in, c khnhm thc hin phn b nh sng, nh v, bo v nv ni n vi ngun in.

Chc nng c bn ca b n

V in, b n ln h vi li in, ni vi cc linhkin mi, u ni v iu chnh nh sng;

V c, b n m bo chng cc tc nhn bn ngoinh ma, gi, bi, va p v n mn;

V quang, b n m bo s phn b nh sng trongkhng gian, thc hin cc kiu chiu sng t chiusng gin tip n trc tip ty theo mc ch v yucu s dng. B n cng hn ch nguyn nhn gyla nhm m bo tin nghi nhn tt nht.

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3.2. PHN LOI B N

a. Theo mc ch s dng ca b n: B n chiu sng ni tht B n chiu sng ngoi tri B n chiu sng trang tr b. Theo s phn b quang thng ca b n (IEC): C 20 loi b n v k hiu bng ch ci in hoa: A-T

Trc tip: c 14 loi (t A-N), trong : TT hp c 5 loi (A-E) v TT

rng c 5 loi (F-J); na trc tip c 4 loi (K-N) Hn hp: c 5 loi (O-S) Gin tip: c 1 loi (T)

C th nh sau:

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Phn loi b n theo IEC

2

3T

T2

T

2

T

0

0K

F1

F2

F3

F4

F5=F5

/2(F

1= F

1)

(F2= F

1+F

2)

3/2

(F3= F

2+F

3)

2

(F4= F

3+F

4)

4

(F0= F

4+F5)

0 4104 600 7505 900 1800

F5

F4

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Loi KiuCS

Quang thng ring tng i phn b trong cc khng gian (lm)

F*

1 F*2 F

*3 F

*4

TB Giihn TB Giihn TB Giihn TB Giihn

A

Trc

tip

hp

900 830-970 967 900-1000 1000 930-1000 1000 930-1000

B 767 700-830 933 870-1000 1000 930-1000 1000 930-1000

C 633 570-700 900 830-970 967 900-1000 1000 930-1000

D533 470

-600 834 770

-900 867

900

-1000 1000

930

-1000

E 433 370-500 767 700-830 967 900-1000 1000 930-1000

F

Trc

tip

rng

400 330-470 867 800-930 1000 930-1000 1000 930-1000

G 367 300-430 667 600-730 900 830-970 1000 930-1000

H 333 270-400 600 530-670 833 770-900 1000 930-1000

I 267 200

-330 667 600

-730

933 870

-1000 1000

930

-1000

J 233 170-300 500 430-570 767 670-800 1000 930-1000

TGintip

0 0-70 0 0-70 0 0-70 0 0-70

Cc loi b n theo IEC (UTE C 71)

F*i= Fi/Ld

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Bn c im p dng

Trctip

- hp-

rn

g(A-J)

-T 90 n 100% nh sng -c chiu xung mt lmvic.

Hiu qu chiu sng cao nht- D gy chi lo, sp bng.-Quang thng tp trung vo mt phng lm vic, t-ng

bn b ti.-Quang thng phn b rng trong na khng gian phad-i,

t-ng bn -c chiu sng.

- Chiu sng vnphng,

Lp hc, ca hngln,

nh x-ng.-a im c cao

ln

Bntrc

tip(K-N)

- T 60 n 90 % nh sng -c chiu xung khng gian- T 10 n 40 % nh sng -c chiu ln trn.Mi tr-ng -c ci thin c t-ng v trn -c chiu sng.

Vn phng, phngkhch, phng tr, nhn

Hnhp(O-S)

- 40 n 60 % nh sng chiu ht ln- Phi hp -u im ca chiu sng trc tip v gin tip.

a im c t-ngv

trn phn x mnh.

Gintip

(T)

- T 90 n 100% nh sng -c chiu ln trn v phn xxung.

-y l ph-ng php chiu sng c hiu qu sng thpnht.

Phng khn gi, nhhng

c im v phm vi p dng ca cc b n

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3.3. CU TO CA B N

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3.3. CU TO CA B N

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3.3. CU TO CA B N

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3.3. CU TO CA B N

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3.3. CU TO CA B N

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3.4. CC CTNHKTHUTC BN CA B N3.4.1. in p - Cng sutcabn

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Vd ng cong phn b cng nh sng

Muen ltheophngngang,cnmutrngtheophng dc

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Vd ng cong phn b cng nh sng

Mu ltheophngngang,cnmuxanhtheophng dc

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3.4.3. Hiu sutcabn - H/ (%)L t s gia quang thng pht ra t b n vi tng quang thng cacc bng n pht ra trong b n

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Cch xc nh hiu sut ca b n

Bc 1: Da vo ng cong phn b cng nh sng, xc nhquang thng:- Ht xung di (F

4): F

1,F2, F3,F

4

- Htl

n trn (F5): F5- Quang thng tng: F0= F

4+ F5

2

3T

T2

T

2

T

0

0K

F1

F2

F3

F4

F5

Bc 2: Xcnhhiuxutcabn

- HiusutchiusngtrctipLd = F4/1000

- HiusutchiusnggintipLi = F5/1000

- Hiusuttngcabn:L = Ld+ Li = F0/1000

Ch : Khi tnh chn loi b n, chn theo quang thng ring tng i: F*i= Fi/Ld

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Vng khnggian GcnghingK0 C-ng sngQuangthng

tng

Hnh nn gc khi T/2 16,62937,5

I1I2I3

F1 = T/6 Ii

Gia hnh nn T/2 v T44,951,357,2

I4I5I6

F2 = T/6 Ii

Gia hnh nn Tv 3T/262,76873

I7I8I9

F3 = T/6 Ii

Gia hnh nn 3T/2 v2T

7882,887,6

I10I11I12

F4 =T/6 Ii

Bn cu trn

93,2 127,799,6 136,2106,1 146,4112,9 160,8

120

I13...

I21

F5 = T/6 Ii

Hiu sutcab n: L =Ld+ Li =(F1+F2+F3+F4+F5)/1000 = F0/1000

2

3T

T2

T

2

T

0

0K

F1

F2

F3

F4

F5

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3.4.4. antoncabn

B n cng l mt thit b in, cho nn cng cn phi mbo an ton v in theo nhng phn loi sau y: Cp bo v in

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Cp bo v chng bi - nc (IP)

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3.4.5. Gcbo v

Gc bo v dng kim tra i chi la mt tin nghi cab n Gc b o v l gc chn nh sng trc tip ca ngun

sng ti mt ng-i quan st

K

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3.4.5. Gcbo v

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3.4.5. Gcbo v

Gc b o v ph thuc vo biu c-ng nhsng v 5 cp cht l-ng chiu sng ca b n, khiu bng ch ci A (rt chnh xc), B (chnh xccao), C (chnh xc), D (bnh th-ng) v E (th)

xem ph lc V tr ca chao n trong th tr -ng ca ng-i

quan st ngi cch sn 1,2m, th ng s la chn lgi tr K hoc tgK = L/H

Gi tr gc K nm bn tri -ng cong Bodmann-Sollner s khng gy c m gic nhn kh chu.-ng nt lin ng vi b n nm ngang cn ntt khi n t dc h-ng nhn.

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