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8/4/2019 Tinh Toan Thiet Ke Manh Dien
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
Bi 27: TNH TON, THIT K MNG
iN TRONG NH
1. Trnh by c cc bc thit k mng in
2. Tnh ton, thit k mng in n gin cho 1phng .
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
Trnh t thit k mng in c tinhnh nh sau:
1. Xc nh mc ch, yu cu s dng mng in2. a ra cc phng n thit k v chn phng n
thch hp.3. Chn dy dn, thit b bo v, ng ct v ngun ly
in ca mng in.4. Lp t v kim tra mng in theo mc ch thit
k.5. Vn hnh th v sa cha nhng li ( nu c ).
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
I- XC NH MC CH, YU CU
1-Tnh cng sut yu cu i vi mng in:Xc nh nhu cu thc t s dng ln nht. Tnh tngcng sut yu cu ca mng in. c tnh hiu qus dng v tnh kinh t, cn xt n cc yu t sau:
+ Kh nng pht trin thm v nhu cu s dng+ Vic s dng KHNG ng thi ca cc ph ti.+ Cc ph ti khng lm vic ht cng sut nh mc.
Do vy, cch tnh nh sau:Pt = P1 + P2+ ..+ Pn.
P yc= Pt x Kyc ;Trong :
Ptl tng cng sut nh mc ca cc ti.Kyc L h s yu cu
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
H s yu cu K yc:-
c tnh ph ti H s yu cu K yc
Chiu sng ngoi tri, nh din tch nh
di 150 m2, x nghip nh 1,0
Chiu sng nh cng cng, ni hihp, lm vic
0,8 0,9
Sn xut th cng nghip 0,3 0,5
Chiu sng ni cc x nghip sn xutln, trung bnh
0,8 0,95
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
2- Mt s yu cu s dng mng introng nh:
Thit k mng in trong nh phi m bo cho vics dng in an ton, thun tin, bn chc v p.Mng in trong nh phi t nhng yu cu sau:
1. t tiu chun an ton in.2. B sung thun tin, d kim tra v sa cha.3. Khng nh hng gia mch in chiu sng v cc
mch in cung cp in cho cc thit b v dng
in khc.4. t cc yu cu k thut v m thut.
Ngoi ra, cn tnh n nhng yu cu ring ca ngis dng. Ty vo kinh t, m thut, s thch
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
IIPhng n thit k:-
1- Thit k s mng in theo kiu phn nhnh tng dy trc chnh:+ c im: ng dy in chnh vo cng t, i sutqua cc khu vc cn cung cp in. Tng phng hoc
khu vc cn cp in th r nhnh n bng in nhnh cp cho cc dng in.
Nhng dng c ph ti ln th c ng cp ring.+ u , nhc im:
-n gin trong thi cng, s dng t dy v thit bnn chi ph thp.-nh hng n yu cu m thut
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
S mng in phn nhnh:
KWh
1-Mch chnh
2-Mch nhnh
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
2- Thit k s mng in tp trung
ng dy chnh sau cng t v p t mt tng cphn ra nhiu nhnh khc nhau. Mi nhnh c t tmt ring n tng phng hoc cc ph ti.
u im: bo v c chn lc.
S dng thun tin, d kim tra, m bo an ton inv m thut.
S dng nhiu dy, thit b nn gi thnh cao. Lp t phc tp, thi gian lu
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
S mng in tp trung:
1-p t mat tng
2- B chia in
3- Bp in
4- T lnh
5- L nc nng
6-iu ha
7- My bm
KWh
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
-S cp in cho 1 phng lm vic
1
2
3
4
5
1: iu hakhng kh
2- B n HQ3- cmin4- Qut trn5- Bng in
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
III- Chn dy dn v cc thit b in:
1. Chn dy dn:Vic chn dy dn cn cc iu kin sau:a) Tit din dy: Ty thuc dng in s dng I sd. Dng Isd = Pt : U.Sau khi tnh c Isdem so snh vi dng in cho php Icp catng tit din dy dn.
Nn chn Isd Icp.
b_kuesgrgsgsfc sfs
c) V cch in: Ph hp in p li in v iu kin lp t. Chn
in p cch in ca v Ucd Ucp
T/din(mm2) Icp (A) T/din Icp(A) T/din Icp(A)
1 6 A 2.5 15 6 35
1.5 10 4 25 10 55
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
2- Chn cc thit b in:
1. Chn cu ch:+ Cu ch phi tc ng khi c s c qu ti hoc ngn mch.+ Cu ch lm vic c tnh chn lc , ngha l tc ng tc thi,
nhanh, khng nh hng n mch chung.+ Dy chy khng b chy khi dng in s dng lu di.
2. Chn cu dao hoc p t mt:+ Dng nh mc ca cu dao >dng ca mng in.+ p t mt tc ng ngt mch khi dng > 6-10 ln nh mc,thi gian tc ng 0,01 0, 2 s. Tc ng khi qu ti, tc ngkhi c dng r 60500 mA
3. Chn cc thit b ng ct v ly in: Nh cng tc, cmp ng dng nh mc v s dng c lu di
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Trn Nh Tho Trung tm KTTHHN Hng Tr - 2008
IV- Lp t mng in theo mc chthit k:
Ty thuc yucu s dng chnphng thc
phn nhnhhay tp trung.Cch lp tng ni hayngm
Trnh by bn
v thit k,nh du v trlp bng inv cc thit b
1
2
3
4
5
1: iu hakhng kh
2- B n3- cmin4- Qut trn5- Bng in
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