ch3.bo den1
TRANSCRIPT
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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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