INDAL CHART
Di mensi on ofAl . Busbar Wi dt h Thi ckness ( mm) ( mm)
Tot alCr ossSect i onPerPhase(sq.mm)
AC Cur r entatan ambi entof35deg& r i se Correcti o Derat edcurr entconsi deri ngcorr ecti on 50deg. nFact or f actoras. 667
No.ofbar s
No.ofbar s
1
2
3
4
1
2
3
0. 667 4
No.ofbar s 1
2
236. 785 470. 235
3
4
25. 4
6. 35
161. 29
322. 58
483. 87
645. 16
355
705
970
1100
0. 667
38. 1
6. 35
241. 94
483. 87
725. 81
967. 74
520
1020
1350
1535
0. 667
346. 84
680. 34
50. 8
6. 35
322. 58
645. 16
967. 74
1290. 32
670
1290
1705
1940
0. 667
446. 89
860. 43 1137. 235 1293. 98
63. 5
6. 35
403. 23
806. 45
1209. 68
1612. 90
810
1510
2000
2260
0. 667
540. 27
1007. 17
76. 2
6. 35
483. 87
967. 74
1451. 61
1935. 48
960
1740
2310
2620
0. 667
640. 32
1160. 58 1540. 77
101. 6
6. 35
645. 16
1290. 32
1935. 48
2580. 64
1235
2140
2800
3200
0. 667
823. 745 1427. 38
127
6. 35
806. 45
1612. 90
2419. 35
3225. 80
1505
2510
3240
3700
0. 667
1003. 835 1674. 17 2161. 08
2467. 9
152. 4
6. 35
967. 74
1935. 48
2903. 22
3870. 96
1780
2860
3680
4240
0. 667
1187. 26 1907. 62 2454. 56
2828. 08
50. 8
9. 53
484. 12
968. 25
1452. 37
1936. 50
830
1500
1970
2260
0. 667
553. 61
1000. 5
1313. 99
1507. 42
76. 2
9. 53
726. 19
1452. 37
2178. 56
2904. 74
1180
2050
2660
3030
0. 667
787. 06
1367. 35 1774. 22
2021. 01
101. 6
9. 53
968. 25
1936. 50
2904. 74
3872. 99
1495
2480
3150
3560
0. 667
997. 165 1654. 16 2101. 05
2374. 52
127
9. 53
1210. 31
2420. 62
3630. 93
4841. 24
1860
2930
3660
4200
0. 667
1240. 62 1954. 31 2441. 22
2801. 4
152. 4
9. 53
1452. 37
2904. 74
4357. 12
5809. 49
2120
3340
4080
4680
0. 667
1414. 04 2227. 78 2721. 36
3121. 56
203. 2
9. 53
1936. 50
3872. 99
5809. 49
7745. 98
2750
4150
4900
5740
0. 667
1834. 25 2768. 05
3268. 3
3828. 58
76. 2
12. 7
967. 74
1935. 48
2903. 22
3870. 96
1355
2240
2830
3240
0. 667
903. 785 1494. 08 1887. 61
2161. 08
101. 6
12. 7
1290. 32
2580. 64
3870. 96
5161. 28
1740
2720
3360
3900
0. 667
1160. 58 1814. 24 2241. 12
2601. 3
127
12. 7
1612. 90
3225. 80
4838. 70
6451. 60
2080
3120
3900
4550
0. 667
1387. 36 2081. 04
2601. 3
3034. 85
152. 4
12. 7
1935. 48
3870. 96
5806. 44
7741. 92
2420
3500
4400
5100
0. 667
1614. 14
2934. 8
3401. 7
203. 2
12. 7
2580. 64
5161. 28
7741. 92
10322. 56
3060
4450
5300
6150
0. 667
2041. 02 2968. 15
3535. 1
4102. 05
254
12. 7
3225. 80
6451. 60
9677. 40
12903. 20
3640
5000
6000
6850
0. 667
2427. 88
4002
4568. 95
2334. 5
3335
646. 99
733. 7
900. 45
1023. 845
1334
1867. 6
1507. 42 1747. 54 2134. 4
CALCULATI ONOF OFALUMI NI UM dr opperf or800A
PARAME METERS Feede rRat i ng
800A 2x50x10 mm2
Si z eofAl umi ni um BusBarc onsi der ed i . e.Runs/Phase
2mm
Wi dt h
50mm
Thi c kness
10mm
Cur r entr at i ngasperI NDALAl umi ni um (E91) =0. 97* EI EM gr adecurr ent
f orEI EM gr ade( Amp)
1455A
Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
Fi nalTemper at ur ePer mi t t ed
90 oC
Si z eofBusBare ncl osur e
175x800sq. mm i . e.Hei ght
175mm
Dept h
800mm
Faul tcur r ent( f or1sec)
50000A
Dur at i onofFaul t
1s
Gr adeofAl .dr opper
E91E
A. MI NI MUM CONDUCTOR SI ZE For mul at odet er mi net hemi mi ni mum si zeofconduct orf oranyf aul tl eve l : 2 Øt= ( k/100)x (I /A) x( 1+α20 .Ø)xt sc (Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page865) Øt=t emp mper at ur eri seaboveoper at i ngt emp mp.i ndeg.C 100 oC
(190-90)oC
95 oC
(185-90)oC
I = ymm mmet ri calf aul tcurr enti nr . m. si nAmps. sc s osssect i onalareaofconduct ori nmm 2 A=cr α20=t emp mper at ur ecoeffic ffici entofr esi st enceat20degC/degC 0. 00403 3f f orpur eAl umi ni um 0. 00363f orAl umi ni um al l oy 0. 00393 f orpur eco pper Ø=oper at i ngt emp mper at ur eoft heconduct oratwhi cht hef aul toccur s k=
1. 166f oral umi ni um 0. 52f 2f orcopper
t =dur at i onoff aul ti nseconds
Al umi ni um s t ar t ssof t eni ngatat e mper at ur eofar ound180200de g. Asar ul eoft humbf or Alconduct or , onaf aul tasaf et e mper at ur er i seof100de gabov et heal l owabl eendt emper at ur e of90degoft heconduct orduri ngnorma malcondi t i onhasbeenconsi der ed& t akenast hebasi s t odet er mi net hemi mi ni mum si zeoft heconduct or
Fi na lt e mp mp.a l l o we df o rbus ba ra f t e rs ho r tc i r c ui ti s190de gC Byput t i ngal lval uesi nt heaboveequat i on
1500
2 100= ( 1. 166/100)(50000/A) ( 1+0. 00363x90)x1
A=
630. 26sq. mm
f orpur eAl .
(finalt e mp190i . e.90+100)
621. 88sq. mm
f orAlal l oy
(finalt e mp190i . e.90+100)
646. 63sq. mm
f orpur eAl .
(finalt e mp185i . e.90+95)
638. 03sq. mm
f orAlal l oy
(finalt e mp185i . e.90+95)
B. THERMALRATI NG I .
DERATI NG FACTOR ON ACCOUNT OF HI GHER AMBI ENT TEMPERATURE Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
De r at i ngFact ork1:
0. 88
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page870, 871)
I I . DERATI NG DUE TO ENCLOSURE Cr osssec t i onalar eaofbus bar
=No.ofPhasex( Cr ossSe ct i onperPhase)x100
cr osssec t i onalar eaofenc l osur e
cr os ss ect i onalar eaofenc l os ur e =300000 140000
=
2. 1428571429
Aspert abl e5( encl osed)ofI NDALpaperonI NDALAl .BusBar , t heder at i ngf act or ,k2:
0. 75
i fr at i oi sl esst han5%
I I I . DERATI NG DUE TO PROXI MI TY EFFECT Busbarr at i ngi sl owert han1600A So, t heder at i ngduet opr oxi mi t yeffectwi l lbe,k3:
0. 95
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page887)
I V. DERATI NG DUE TO BUSBAR MATERI AL Gr ade:
El ect r ol yt i cgr .Al . ( D50SWP)
Der at i ngFact or,k4:
i . e.E91E
(I NDALALLOY)
1
V. TOTALDERATI NG FACTOR Tot alder at i ng=der at i ngduet oambi entxder at i ngduet oencl os ur exder at i ngdue t opr oxi mi t yeffectxder at i ngduet obusbarmat eri al =k1xk2xk3xk4 0. 627 So,t hecr osssect i onofdr opperr equi r edf or630Aoutgoi ngACB shal lcary630Aaf t er consi der i ngal lder at i ngf act or s =( Combi nedder at i ngf act or)x(Curr entf r om I ndalDat aSheet ) =( k1xk2xk3xk4)x(Cur r entf r om I ndalDat aShee t ) 912. 285
So, t hebusbars i zechoosenf r om I ndalsheets hal lbecapabl eof car r yi ng 912. 285A
CALCULATI ONOFALUMI NI UM dr opperf or1000/1250A
PARAMETERS Feede rRat i ng
1000/1250
A
3x50x10 mm2
Si z eofAl umi ni um BusBarc onsi der ed i . e.Runs/Phase
3mm
Wi dt h
50mm
Thi c kness
10mm
Cur r entr at i ngasperI NDALAl umi ni um (E91) =0. 97* EI EM gr adecurr ent
f orEI EM gr ade( A)
1998. 2A
Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
Fi nalTemper at ur ePer mi t t ed
90 oC
Si z eofBusBare ncl osur e
175x800sq. mm i . e.Hei ght
175mm
Dept h
800mm
Faul tcur r ent( f or1sec)
50000A
Dur at i onofFaul t
1s
Gr adeofAl .dr opper
E91E
A. MI NI MUM CONDUCTOR SI ZE For mul at odet er mi net hemi ni mum si zeofconduct orf oranyf aul tl eve l : 2 Øt= ( k/100)x (I /A) x( 1+α20 .Ø)xt sc (Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page865) Øt=t emper at ur eri seaboveoper at i ngt emp.i ndeg.C 100 oC
(190-90)oC
95 oC
(185-90)oC
I = ymmet ri calf aul tcurr enti nr . m. si nAmps. sc s osssect i onalareaofconduct ori nmm 2 A=cr α20=t emper at ur ecoeffici entofr esi st enceat20degC/degC 0. 00403f orpur eAl umi ni um 0. 00363f orAl umi ni um al l oy 0. 00393 f orpur eco pper Ø=oper at i ngt emper at ur eoft heconduct oratwhi cht hef aul toccur s k=
1. 166f oral umi ni um 0. 52f orcopper
t =dur at i onoff aul ti nseconds
Al umi ni um s t ar t ssof t eni ngatat e mper at ur eofar ound180200de g. Asar ul eoft humbf or Alconduct or , onaf aul tasaf et e mper at ur er i seof100de gabov et heal l owabl eendt emper at ur e of90degoft heconduct orduri ngnormalcondi t i onhasbeenconsi der ed& t akenast hebasi s t odet er mi net hemi ni mum si zeoft heconduct or
Fi na lt e mp.a l l o we df o rbus ba ra f t e rs ho r tc i r c ui ti s190de gC Byput t i ngal lval uesi nt heaboveequat i on
2060
2 100= ( 1. 166/100)(50000/A) ( 1+0. 00363x90)x1
A=
630. 26sq. mm
f orpur eAl .
(finalt e mp190i . e.90+100)
621. 88sq. mm
f orAlal l oy
(finalt e mp190i . e.90+100)
646. 63sq. mm
f orpur eAl .
(finalt e mp185i . e.90+95)
638. 03sq. mm
f orAlal l oy
(finalt e mp185i . e.90+95)
B. THERMALRATI NG I .
DERATI NG FACTOR ON ACCOUNT OF HI GHER AMBI ENT TEMPERATURE Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
De r at i ngFact ork1:
0. 88
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page870, 871)
I I . DERATI NG DUE TO ENCLOSURE Cr osssec t i onalar eaofbus bar
=No.ofPhasex( Cr ossSe ct i onperPhase)x100
cr osssec t i onalar eaofenc l osur e
cr os ss ect i onalar eaofenc l os ur e =450000 140000
=
3. 2142857143
Aspert abl e5( encl osed)ofI NDALpaperonI NDALAl .BusBar , t heder at i ngf act or ,k2:
0. 75
i fr at i oi sl esst han5%
I I I . DERATI NG DUE TO PROXI MI TY EFFECT Busbarr at i ngi sl owert han1600A So, t heder at i ngduet opr oxi mi t yeffectwi l lbe,k3:
0. 95
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page887)
I V. DERATI NG DUE TO BUSBAR MATERI AL Gr ade:
El ect r ol yt i cgr .Al . ( D50SWP)
Der at i ngFact or,k4:
i . e.E91E
(I NDALALLOY)
1
V. TOTALDERATI NG FACTOR Tot alder at i ng=der at i ngduet oambi entxder at i ngduet oencl os ur exder at i ngdue t opr oxi mi t yeffectxder at i ngduet obusbarmat eri al =k1xk2xk3xk4 0. 627 So,t hecr osssect i onofdr opperr equi r edf or630Aoutgoi ngACB shal lcary630Aaf t er consi der i ngal lder at i ngf act or s =( Combi nedder at i ngf act or)x(Curr entf r om I ndalDat aSheet ) =( k1xk2xk3xk4)x(Cur r entf r om I ndalDat aShee t ) 1252. 8714
So, t hebusbars i zechoosenf r om I ndalsheets hal lbecapabl eof car r yi ng 1252. 8714 A
CALCULATI ONOFALUMI NI UM dr opperf or1250/1600A
PARAMETERS Feede rRat i ng
1250/1600
A
4x50x10 mm2
Si z eofAl umi ni um BusBarc onsi der ed i . e.Runs/Phase
4mm
Wi dt h
50mm
Thi c kness
10mm
Cur r entr at i ngasperI NDALAl umi ni um (E91) =0. 97* EI EM gr adecurr ent
f orEI EM gr ade( A)
2429. 85A
Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
Fi nalTemper at ur ePer mi t t ed
90 oC
Si z eofBusBare ncl osur e
175x800sq. mm i . e.Hei ght
175mm
Dept h
800mm
Faul tcur r ent( f or1sec)
50000A
Dur at i onofFaul t
1s
Gr adeofAl .dr opper
E91E
A. MI NI MUM CONDUCTOR SI ZE For mul at odet er mi net hemi ni mum si zeofconduct orf oranyf aul tl eve l : 2 Øt= ( k/100)x (I /A) x( 1+α20 .Ø)xt sc (Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page865) Øt=t emper at ur eri seaboveoper at i ngt emp.i ndeg.C 100 oC
(190-90)oC
95 oC
(185-90)oC
I = ymmet ri calf aul tcurr enti nr . m. si nAmps. sc s osssect i onalareaofconduct ori nmm 2 A=cr α20=t emper at ur ecoeffici entofr esi st enceat20degC/degC 0. 00403f orpur eAl umi ni um 0. 00363f orAl umi ni um al l oy 0. 00393 f orpur eco pper Ø=oper at i ngt emper at ur eoft heconduct oratwhi cht hef aul toccur s k=
1. 166f oral umi ni um 0. 52f orcopper
t =dur at i onoff aul ti nseconds
Al umi ni um s t ar t ssof t eni ngatat e mper at ur eofar ound180200de g. Asar ul eoft humbf or Alconduct or , onaf aul tasaf et e mper at ur er i seof100de gabov et heal l owabl eendt emper at ur e of90degoft heconduct orduri ngnormalcondi t i onhasbeenconsi der ed& t akenast hebasi s t odet er mi net hemi ni mum si zeoft heconduct or
Fi na lt e mp.a l l o we df o rbus ba ra f t e rs ho r tc i r c ui ti s190de gC Byput t i ngal lval uesi nt heaboveequat i on
2505
2 100= ( 1. 166/100)(50000/A) ( 1+0. 00363x90)x1
A=
630. 26sq. mm
f orpur eAl .
(finalt e mp190i . e.90+100)
621. 88sq. mm
f orAlal l oy
(finalt e mp190i . e.90+100)
646. 63sq. mm
f orpur eAl .
(finalt e mp185i . e.90+95)
638. 03sq. mm
f orAlal l oy
(finalt e mp185i . e.90+95)
B. THERMALRATI NG I .
DERATI NG FACTOR ON ACCOUNT OF HI GHER AMBI ENT TEMPERATURE Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
De r at i ngFact ork1:
0. 88
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page870, 871)
I I . DERATI NG DUE TO ENCLOSURE Cr osssec t i onalar eaofbus bar
=No.ofPhasex( Cr ossSe ct i onperPhase)x100
cr osssec t i onalar eaofenc l osur e
cr os ss ect i onalar eaofenc l os ur e =600000 140000
=
4. 2857142857
Aspert abl e5( encl osed)ofI NDALpaperonI NDALAl .BusBar , t heder at i ngf act or ,k2:
0. 75
i fr at i oi sl esst han5%
I I I . DERATI NG DUE TO PROXI MI TY EFFECT Busbarr at i ngi sl owert han1600A So, t heder at i ngduet opr oxi mi t yeffectwi l lbe,k3:
0. 95
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page887)
I V. DERATI NG DUE TO BUSBAR MATERI AL Gr ade:
El ect r ol yt i cgr .Al . ( D50SWP)
Der at i ngFact or,k4:
i . e.E91E
(I NDALALLOY)
1
V. TOTALDERATI NG FACTOR Tot alder at i ng=der at i ngduet oambi entxder at i ngduet oencl os ur exder at i ngdue t opr oxi mi t yeffectxder at i ngduet obusbarmat eri al =k1xk2xk3xk4 0. 627 So,t hecr osssect i onofdr opperr equi r edf or630Aoutgoi ngACB shal lcary630Aaf t er consi der i ngal lder at i ngf act or s =( Combi nedder at i ngf act or)x(Curr entf r om I ndalDat aSheet ) =( k1xk2xk3xk4)x(Cur r entf r om I ndalDat aShee t ) 1523. 51595
So, t hebusbars i zechoosenf r om I ndalsheets hal lbecapabl eof car r yi ng 1523. 51595 A
CALCULATI ON OFALUMI NI UM BUSLI NK f or800A
PARAMETERS Feede rRat i ng
800A 2x76. 2x6. 35 mm2
Si z eofAl umi ni um BusBarc onsi der ed i . e.Runs/Phase
2mm
Wi dt h
76. 2mm
Thi c kness
6. 35mm
Cur r entr at i ngasperI NDALAl umi ni um (E91) =0. 97* EI EM gr adecurr ent
1740A
Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
Fi nalTemper at ur ePer mi t t ed
90 oC
Si z eofBusBare ncl osur e
175x800sq. mm i . e.Hei ght
175mm
Dept h
800mm
Faul tcur r ent( f or1sec)
50000A
Dur at i onofFaul t
1s
Gr adeofAl .dr opper
E91E
A. MI NI MUM CONDUCTOR SI ZE For mul at odet er mi net hemi ni mum si zeofconduct orf oranyf aul tl eve l : 2 Øt= ( k/100)x (I /A) x( 1+α20 .Ø)xt sc (Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page865) Øt=t emper at ur eri seaboveoper at i ngt emp.i ndeg.C 100 oC
(190-90)oC
95 oC
(185-90)oC
I = ymmet ri calf aul tcurr enti nr . m. si nAmps. sc s osssect i onalareaofconduct ori nmm 2 A=cr α20=t emper at ur ecoeffici entofr esi st enceat20degC/degC 0. 00403f orpur eAl umi ni um 0. 00363f orAl umi ni um al l oy 0. 00393 f orpur eco pper Ø=oper at i ngt emper at ur eoft heconduct oratwhi cht hef aul toccur s k=
1. 166f oral umi ni um 0. 52f orcopper
t =dur at i onoff aul ti nseconds
Al umi ni um s t ar t ssof t eni ngatat e mper at ur eofar ound180200de g. Asar ul eoft humbf or Alconduct or , onaf aul tasaf et e mper at ur er i seof100de gabov et heal l owabl eendt emper at ur e of90degoft heconduct orduri ngnormalcondi t i onhasbeenconsi der ed& t akenast hebasi s t odet er mi net hemi ni mum si zeoft heconduct or
Fi na lt e mp.a l l o we df o rbus ba ra f t e rs ho r tc i r c ui ti s190de gC Byput t i ngal lval uesi nt heaboveequat i on
2 100= ( 1. 166/100)(50000/A) ( 1+0. 00363x90)x1
A=
630. 26sq. mm
f orpur eAl .
(finalt e mp190i . e.90+100)
621. 88sq. mm
f orAlal l oy
(finalt e mp190i . e.90+100)
646. 63sq. mm
f orpur eAl .
(finalt e mp185i . e.90+95)
638. 03sq. mm
f orAlal l oy
(finalt e mp185i . e.90+95)
B. THERMALRATI NG I .
DERATI NG FACTOR ON ACCOUNT OF HI GHER AMBI ENT TEMPERATURE Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
De r at i ngFact ork1:
0. 88
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page870, 871)
I I . DERATI NG DUE TO ENCLOSURE Cr osssec t i onalar eaofbus bar
=No.ofPhasex( Cr ossSe ct i onperPhase)x100
cr osssec t i onalar eaofenc l osur e
cr os ss ect i onalar eaofenc l os ur e =290322 140000
=
2. 0737285714
Aspert abl e5( encl osed)ofI NDALpaperonI NDALAl .BusBar , t heder at i ngf act or ,k2:
0. 75
i fr at i oi sl esst han5%
I I I . DERATI NG DUE TO PROXI MI TY EFFECT Busbarr at i ngi sl owert han1600A So, t heder at i ngduet opr oxi mi t yeffectwi l lbe,k3:
0. 95
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page887)
I V. DERATI NG DUE TO BUSBAR MATERI AL Gr ade:
El ect r ol yt i cgr .Al . ( D50SWP)
Der at i ngFact or,k4:
i . e.E91E
(I NDALALLOY)
1
V. TOTALDERATI NG FACTOR Tot alder at i ng=der at i ngduet oambi entxder at i ngduet oencl os ur exder at i ngdue t opr oxi mi t yeffectxder at i ngduet obusbarmat eri al =k1xk2xk3xk4 0. 627 So,t hecr osssect i onofdr opperr equi r edf or630Aoutgoi ngACB shal lcary630Aaf t er consi der i ngal lder at i ngf act or s =( Combi nedder at i ngf act or)x(Curr entf r om I ndalDat aSheet ) =( k1xk2xk3xk4)x(Cur r entf r om I ndalDat aShee t ) 1090. 98
So, t hebusbars i zechoosenf r om I ndalsheets hal lbecapabl eof car r yi ng 1090. 98 A
CALCULATI ON OFALUMI NI UM BUSLI NK ff or1000/1250A
PARAMETERS Feede rRat i ng
1000/1250
A
3x76. 2x6. 35 mm2
Si z eofAl umi ni um BusBarc onsi der ed i . e.Runs/Phase
3mm
Wi dt h
76. 2mm
Thi c kness
6. 35mm
Cur r entr at i ngasperI NDALAl umi ni um (E91) =0. 97* EI EM gr adecurr ent
2310A
Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
Fi nalTemper at ur ePer mi t t ed
90 oC
Si z eofBusBare ncl osur e
175x800sq. mm i . e.Hei ght
175mm
Dept h
800mm
Faul tcur r ent( f or1sec)
50000A
Dur at i onofFaul t
1s
Gr adeofAl .dr opper
E91E
A. MI NI MUM CONDUCTOR SI ZE For mul at odet er mi net hemi ni mum si zeofconduct orf oranyf aul tl eve l : 2 Øt= ( k/100)x (I /A) x( 1+α20 .Ø)xt sc (Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page865) Øt=t emper at ur eri seaboveoper at i ngt emp.i ndeg.C 100 oC
(190-90)oC
95 oC
(185-90)oC
I = ymmet ri calf aul tcurr enti nr . m. si nAmps. sc s osssect i onalareaofconduct ori nmm 2 A=cr α20=t emper at ur ecoeffici entofr esi st enceat20degC/degC 0. 00403f orpur eAl umi ni um 0. 00363f orAl umi ni um al l oy 0. 00393 f orpur eco pper Ø=oper at i ngt emper at ur eoft heconduct oratwhi cht hef aul toccur s k=
1. 166f oral umi ni um 0. 52f orcopper
t =dur at i onoff aul ti nseconds
Al umi ni um s t ar t ssof t eni ngatat e mper at ur eofar ound180200de g. Asar ul eoft humbf or Alconduct or , onaf aul tasaf et e mper at ur er i seof100de gabov et heal l owabl eendt emper at ur e of90degoft heconduct orduri ngnormalcondi t i onhasbeenconsi der ed& t akenast hebasi s t odet er mi net hemi ni mum si zeoft heconduct or
Fi na lt e mp.a l l o we df o rbus ba ra f t e rs ho r tc i r c ui ti s190de gC Byput t i ngal lval uesi nt heaboveequat i on
2 100= ( 1. 166/100)(50000/A) ( 1+0. 00363x90)x1
A=
630. 26sq. mm
f orpur eAl .
(finalt e mp190i . e.90+100)
621. 88sq. mm
f orAlal l oy
(finalt e mp190i . e.90+100)
646. 63sq. mm
f orpur eAl .
(finalt e mp185i . e.90+95)
638. 03sq. mm
f orAlal l oy
(finalt e mp185i . e.90+95)
B. THERMALRATI NG I .
DERATI NG FACTOR ON ACCOUNT OF HI GHER AMBI ENT TEMPERATURE Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
De r at i ngFact ork1:
0. 88
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page870, 871)
I I . DERATI NG DUE TO ENCLOSURE Cr osssec t i onalar eaofbus bar
=No.ofPhasex( Cr ossSe ct i onperPhase)x100
cr osssec t i onalar eaofenc l osur e
cr os ss ect i onalar eaofenc l os ur e =435483 140000
=
3. 1105928571
Aspert abl e5( encl osed)ofI NDALpaperonI NDALAl .BusBar , t heder at i ngf act or ,k2:
0. 75
i fr at i oi sl esst han5%
I I I . DERATI NG DUE TO PROXI MI TY EFFECT Busbarr at i ngi sl owert han1600A So, t heder at i ngduet opr oxi mi t yeffectwi l lbe,k3:
0. 95
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page887)
I V. DERATI NG DUE TO BUSBAR MATERI AL Gr ade:
El ect r ol yt i cgr .Al . ( D50SWP)
Der at i ngFact or,k4:
i . e.E91E
(I NDALALLOY)
1
V. TOTALDERATI NG FACTOR Tot alder at i ng=der at i ngduet oambi entxder at i ngduet oencl os ur exder at i ngdue t opr oxi mi t yeffectxder at i ngduet obusbarmat eri al =k1xk2xk3xk4 0. 627 So,t hecr osssect i onofdr opperr equi r edf or630Aoutgoi ngACB shal lcary630Aaf t er consi der i ngal lder at i ngf act or s =( Combi nedder at i ngf act or)x(Curr entf r om I ndalDat aSheet ) =( k1xk2xk3xk4)x(Cur r entf r om I ndalDat aShee t ) 1448. 37
So, t hebusbars i zechoosenf r om I ndalsheets hal lbecapabl eof car r yi ng 1448. 37 A
CALCULATI ONOFALUMI NI UM BUSLI NK f or1250/1600A
PARAMETERS Feede rRat i ng
1250/1600
A
4x76. 2x6. 35 mm2
Si z eofAl umi ni um BusBarc onsi der ed i . e.Runs/Phase
4mm
Wi dt h
76. 2mm
Thi c kness
6. 35mm
Cur r entr at i ngasperI NDALAl umi ni um (E91) =0. 97* EI EM gr adecurr ent
2620A
Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
Fi nalTemper at ur ePer mi t t ed
90 oC
Si z eofBusBare ncl osur e
175x800sq. mm i . e.Hei ght
175mm
Dept h
800mm
Faul tcur r ent( f or1sec)
50000A
Dur at i onofFaul t
1s
Gr adeofAl .dr opper
E91E
A. MI NI MUM CONDUCTOR SI ZE For mul at odet er mi net hemi ni mum si zeofconduct orf oranyf aul tl eve l : 2 Øt= ( k/100)x (I /A) x( 1+α20 .Ø)xt sc (Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page865) Øt=t emper at ur eri seaboveoper at i ngt emp.i ndeg.C 100 oC
(190-90)oC
95 oC
(185-90)oC
I = ymmet ri calf aul tcurr enti nr . m. si nAmps. sc s osssect i onalareaofconduct ori nmm 2 A=cr α20=t emper at ur ecoeffici entofr esi st enceat20degC/degC 0. 00403f orpur eAl umi ni um 0. 00363f orAl umi ni um al l oy 0. 00393 f orpur eco pper Ø=oper at i ngt emper at ur eoft heconduct oratwhi cht hef aul toccur s k=
1. 166f oral umi ni um 0. 52f orcopper
t =dur at i onoff aul ti nseconds
Al umi ni um s t ar t ssof t eni ngatat e mper at ur eofar ound180200de g. Asar ul eoft humbf or Alconduct or , onaf aul tasaf et e mper at ur er i seof100de gabov et heal l owabl eendt emper at ur e of90degoft heconduct orduri ngnormalcondi t i onhasbeenconsi der ed& t akenast hebasi s t odet er mi net hemi ni mum si zeoft heconduct or
Fi na lt e mp.a l l o we df o rbus ba ra f t e rs ho r tc i r c ui ti s190de gC Byput t i ngal lval uesi nt heaboveequat i on
2 100= ( 1. 166/100)(50000/A) ( 1+0. 00363x90)x1
A=
630. 26sq. mm
f orpur eAl .
(finalt e mp190i . e.90+100)
621. 88sq. mm
f orAlal l oy
(finalt e mp190i . e.90+100)
646. 63sq. mm
f orpur eAl .
(finalt e mp185i . e.90+95)
638. 03sq. mm
f orAlal l oy
(finalt e mp185i . e.90+95)
B. THERMALRATI NG I .
DERATI NG FACTOR ON ACCOUNT OF HI GHER AMBI ENT TEMPERATURE Desi gnAmbi entTemper at ur e
50 oC
Ri sei nTemper at ur eal l owed
40 oC
De r at i ngFact ork1:
0. 88
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page870, 871)
I I . DERATI NG DUE TO ENCLOSURE Cr osssec t i onalar eaofbus bar
=No.ofPhasex( Cr ossSe ct i onperPhase)x100
cr osssec t i onalar eaofenc l osur e
cr os ss ect i onalar eaofenc l os ur e =580644 140000
=
4. 1474571429
Aspert abl e5( encl osed)ofI NDALpaperonI NDALAl .BusBar , t heder at i ngf act or ,k2:
0. 75
i fr at i oi sl esst han5%
I I I . DERATI NG DUE TO PROXI MI TY EFFECT Busbarr at i ngi sl owert han1600A So, t heder at i ngduet opr oxi mi t yeffectwi l lbe,k3:
0. 95
(Ref :I ndust r i alPowerEngi neer i ngandAppl i cat i onHandbook,Page887)
I V. DERATI NG DUE TO BUSBAR MATERI AL Gr ade:
El ect r ol yt i cgr .Al . ( D50SWP)
Der at i ngFact or,k4:
i . e.E91E
(I NDALALLOY)
1
V. TOTALDERATI NG FACTOR Tot alder at i ng=der at i ngduet oambi entxder at i ngduet oencl os ur exder at i ngdue t opr oxi mi t yeffectxder at i ngduet obusbarmat eri al =k1xk2xk3xk4 0. 627 So,t hecr osssect i onofdr opperr equi r edf or630Aoutgoi ngACB shal lcary630Aaf t er consi der i ngal lder at i ngf act or s =( Combi nedder at i ngf act or)x(Curr entf r om I ndalDat aSheet ) =( k1xk2xk3xk4)x(Cur r entf r om I ndalDat aShee t ) 1642. 74
So, t hebusbars i zechoosenf r om I ndalsheets hal lbecapabl eof car r yi ng 1642. 74 A
Oper at i ngt emperat ure90degC Ambi entt emp
Per mi ssi bl eBart empr i se
o
o
C
Der at i ngFact or
35
55
1. 05
40
50
1
45 50
45 40
0. 945 0. 88
55
35
0. 815
60
30
0. 75
C
Oper at i ngt emperat ure85degC Ambi entt emp
Per mi ssi bl eBart empr i se
o
C
o
C
Der at i ngFact or
30
55
1. 05
35
50
1
40
45
0. 945
45
40
0. 88
50
35
0. 815
55
30
0. 75
Der at i ngFact orduet omat er i al El ect r ol yt i cGr adei . e.E91E
0. 94
Der at i ngFact orduet oPr oxi mi t yEffect Busbarr at i ngi sl owert han1600A
0. 95
Der at i ngFact orduet oencl osur e Encl osur e 1. Out door 2. I ndoorwher et heencl osur e i t s e l fi si nawe l lv ent i l l at ed r o o m 2. I ndoorwher et heencl osur e i t s e l fi si napoor l yv ent i l l at ed r oom & r oom t empi shi gh
Rat i o
Der at i ngFact or
<1%
0. 95
5%
0. 9
10%
0. 85
<1% 5% 10% <1% 5%
0. 85 0. 75 0. 65 0. 65 0. 6
10%
0. 5
