Tinh Toan Thiet Ke Manh Dien

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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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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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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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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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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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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S mng in phn nhnh:

KWh

1-Mch chnh

2-Mch nhnh


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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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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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-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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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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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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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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