1.Short Circuir Calculation

7/31/2019 1.Short Circuir Calculation

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PREPARED BY

Voltage Rating E :E kV 0.415 0.415 DG Rating :P kVA 2000 1500 Sub transient Reactance :Xd" P.U 0.109 0.108 % Reactance : Xd" % =Xd" in PU *100 10.90 10.80 Reactance in P.U :Ohm =% Xd" * kV 2 * 10 / rated kVA 0.009386263 0.0124002

Impedence of the DG isgiven by :Zg Ohm =(E/Psc)*1000 0.0861125 0.114816667 0

Short Ciruit kVA (Psc) atDG terminal is given by. :Psc kVA =(P/%Xd)*100 18348.62385 13888.88889 9124

Short Circuit Current isGiven by :Isc kA =(Psc in kVA)/(1.732XEX1000) 2 5.52745465 19.32286498 12.6

Enter the data as per your DG Sync panel configuration

DG's E in kV P in kVA Xd" in PU Xd" in % Psc in kVA Isc in k1 0.415 1000 0.14 14 7142.857143 2 0.415 1000 0.13 13 7692.307692 3 0.415 2000 0.109 10.9 18348.62385 4 0.415 2000 0.109 10.9 18348.62385 5 0.415 2000 0.109 10.9 18348.62385 6 0.415 1000 0.13 13 7692.307692

Total fault level 9000 77573.34409 kVA

The equivalent Z @ at theDG Synch panel 0.002220157 Ohm(Which is given by parallel method ofcomputing equivalent impedance)

A Short Ckt. Current @ DG sync panel is thecumulativiof all thi individual DG short 97.22173182 kAcircuit current.

B Short Ckt. Current @ DG syncpanel is 107.9236263 kA

Data from

DG SHORT CIRCUIT CALCULATION

OR

=(Total Fault level /1.732*E*1000)

AJAY KUMAR


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From To R X Z

Trr-1 EB/DG PANEL-1 0.000129 0.0000705 0.005145268

EB/DG PANE SMSB-A&B 0.000129 0.0000705 0.000275639

EB/DG PANE SMSB-C&D 0.000129 0.0000705 0.000275639

SMSB-A&B MLP 0.00021 0.0000718 0.001664514

SMSB-C&D AHU-1 0.000264 0.0000716 0.002051528

SMSB-1 UPS-B1 0.00016 0.0000839 0.002709949

SMSB-1 UPS-ACOP 0.00016 0.0000839 0.002709949

SMSB-A&B CAFETERIA 0.00021 0.0000718 0.039948339

SMSB-2 AHU-2 0.000264 0.0000716 0.002051528

SMSB-2 UPS-C1 0.00016 0.0000839 0.001806633

SMSB-2 UPS-D1 0.00016 0.0000839 0.001806633

SMSB-2 UPS-ACOP 0.00016 0.0000839 0.001806633

SMSB-A&B LC 0.00021 0.0000718 0.016645141

SMSB-C&D LC 0.00021 0.0000718 0.016645141

MLP MLP-B 0.000409 0.0000724 0.024921516

MLP MLP-C 0.000409 0.0000724 0.019937212

MLP MLP-D 0.000409 0.0000724 0.024921516

MLP-B LDB-01B 0.00394 0.0000837 0.078817779

MLP-C LDB-01C 0.00394 0.0000837 0.078817779

MLP-D LDB-01D 0.00394 0.0000837 0.078817779

LDB-01B R1 0.00798 0.399

LDB-01C R1 0.00798 0.399

LDB-01D R1 0.00798 0.399

AHU-1 AHU PANEL-B 0.000409 0.0000724 0.024921516

AHU-2 AHU PANEL-C 0.000409 0.0000724 0.019937212

LDB-01C

LDB-01D

R1

R1

R1

LC

AHU PANEL-B

AHU PANEL-C

MLP-B

MLP-C

MLP-D

LDB-01B

Impedance of cable or BBTLocations

EB/DG PANEL

AHU-2

SMSB-1

CAFETERIA

UPS-ACOP

Fault @ Different

UPS-C1

UPS-ACOP

UPS-D1

SMSB-2

MLP

AHU-1

UPS-B1

LC


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From To R X Z Impedance of cable or BBT

LocationsFault @ Different

AHU-2 AHU PANEL-D 0.000409 0.0000724 0.024921516

AHU PANEL- AHU-41C 0.00394 0.0000884 0.118229747 MLP-C LDB-41C 0.00394 0.0000837 0.118226668

UPS-B1 UPSBBT-B 0.000129 0.0000836 0.005380214

UPS-C1 UPSBBT-C 0.000129 0.0000836 0.005380214

UPS-D1 UPSBBT-D 0.000129 0.0000836 0.005380214

UPSBBT-B UPS FDB-01B 0.000931 0.000103 0.014050205

UPSBBT-C UPS FDB-01C 0.000931 0.000103 0.014050205

UPSBBT-D UPS FDB-01C 0.000931 0.000103 0.014050205

UPS FDB-01B UDB-01B 0.00147 0.0000808 0.022083284

UPS FDB-01C UDB-01C 0.00147 0.0000808 0.022083284

UPS FDB-01D UDB-01D 0.00147 0.0000808 0.022083284

UDB-01B R1 0.00798 0.399

UDB-01C R1 0.00798 0.399

UDB-01D R1 0.00798 0.399

UPSBBT-D

UDB-01C

UDB-01C

R1

R1

R1

UPSBBT-B

UPSBBT-C

LDB-41C

AHU-41C

AHU PANEL-D

UPS FDB-01C

UPS FDB-01C

UDB-01B

UPS FDB-01B


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Constant CABLE REQUIREDCABLEC S in Sqmm USED

11.1 161.488048 BBT

11.1 155.6626212 8x300

11.1 155.6626212 1x300

11.1 127.8188244 2x185

11.1 122.7151623 2x150

11.1 114.9093413 2x150

11.1 114.9093413 2x150

11.1 24.993549 2x185

11.1 122.7151623 1x300

11.1 125.8960907 2x150

11.1 125.8960907 2x150

11.1 125.8960907 2x150

11.1 48.9754599 2x150

11.1 48.9754599 2x150

11.1 34.75106834 1x95

11.1 40.67423278 1x95

11.1 34.75106834 1x95

11.1 10.52173396 10

11.1 11.00704984 10

11.1 10.52173396 10

11.1 2.322898127 2.5

11.1 2.345731747 2.5

11.1 2.322898127 2.5

11.1 34.36252268 1x95

11.1 40.14295992 1x95


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Constan CABLE REQUIREDCABLEC S in Sqmm USED

11.1 34.36252268 1x95

11.1 8.044310014 1x611.1 8.065589196 1x10

11.1 2.163653833 2x185

11.1 2.167214993 2x185

11.1 2.167214993 2x185

11.1 2.109732619 1x25

11.1 2.113118354 1x25

11.1 2.113118354 1x25

11.1 2.03020944 1x16

11.1 2.033344554 1x16

11.1 2.033344554 1x16

11.1 1.207707066 2.5

11.1 1.20881579 2.5

11.1 1.20881579 2.5


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PREPARED BY AJAY KUMAR

System Voltage Primary : E1 11 KV

System Voltage Secondary : E2 415 VShort Circuit MVA @11KV Side : Psc 193 MVATransformer rating : P 1600 KVATransformer %Impedance : %Z 6.25Transformation ratio : K 0.037727SC Current withstand time : t 1 SecConstant for PVC Aluminium cable : C 13.2Constant for PVC Copper cable : C 8.69Constant for XLPE Aluminium cable : C 10.63 Constant for XLPE Copper cables : C 6.99

The minimum size of the conductor(S) in Sqmm S= Iw*C*Sqrt(t) required to withstand shortcircuit current(Iw) inkA for t sec is given by

Total Impedance of Upstream network Zup= (E1*E1)/Psc= 0.626943005 Ohm

Zup= Zup*K*K = 0.000892358 Ohm

Zt= (E2*E2)/(P*1000)*%Z/100= 0.006727539 Ohm

Fault Current on the Secondary of Transformer Isec= (E2)/(1.732*(Zup+Zt) = 31.44 kA

From To No of R X Z RunsMAIN LT PANEL Stenter 0.000161 0.000071 0.007038 5

MAIN LT PANEL Pad M/c Panel 0.000129 0.0000705 0.007595 3

MAIN LT PANEL Dyeing 0.000102 0.0000704 0.009295 3

MAIN LT PANEL Boiler 0.000102 0.0000704 0.004957 3

MAIN LT PANEL Compressor 0.00021 0.0000718 0.013316 2

MAIN LT PANEL Lighting

MAIN LT PANEL

SHORT CIRCUIT CALCULATION

Impedance of cable or BBT

Zup on Low Voltage Side

Fault @ DifferentLocationsmain power panel-1

Dyeing

Boiler

Compressor

Lighting

Pad M/c Panel

Impedance of the transformer


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ReactanceAl Cu

1.5 0.01550 0.0001072.5 0.00950 0.0000985

4 0.00950 0.00590 0.00009276 0.00590 0.00394 0.0000884

10 0.00394 0.00234 0.000083716 0.00244 0.00147 0.0000808

Approx. AC ResistanceAluminiumArea in Sqmm


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Area AC Reactance @ 50HzSqmm Ohm/Meter

Al Cu Al/Cu

25 0.001530 0.000931 0.0000810035 0.001110 0.000671 0.0000783050 0.000818 0.000496 0.0000750070 0.000565 0.000344 0.0000740095 0.000409 0.000248 0.00007240

120 0.000323 0.000197 0.00007120150 0.000264 0.000160 0.00007160185 0.000210 0.000129 0.00007180240 0.000161 0.000099 0.00007100300 0.000129 0.000080 0.00007050 0.000128400 0.000102 0.000064 0.00007040500 0.000078 0.000052 0.00007020

630 0.000061 0.000043 0.00006980.

AC Resistance @ 90deg.COhm / Meters


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Ohm/Meter Ohm/MeterArea Sqmm Arm UnarmAl / Cu Al. Cu Al / Cu Al / Cu

1.5 0.015500 0.00015502.5 0.009500 0.0001420

4 0.00950 0.005900 0.00013206 0.00590 0.003940 0.0001230

10 0.00394 0.002340 0.0001340 0.000114016 0.00244 0.001470 0.0001250 0.000108025 0.00153 0.000931 0.0001200 0.000103035 0.00111 0.000671 0.0001140 0.000098650 0.00082 0.000496 0.0001080 0.000093770 0.00057 0.000344 0.0001020 0.000090095 0.00041 0.000248 0.0001000 0.0000865

120 0.00032 0.000197 0.0000968 0.0000841150 0.00026 0.000160 0.0000941 0.0000839185 0.00021 0.000129 0.0000932 0.0000836240 0.00016 0.000099 0.0000900 0.0000813300 0.00013 0.000080 0.0000881 0.0000795400 0.00010 0.000064 0.0000873 0.0000787500 0.00008 0.000052 0.0000859 0.0000779630 0.00006 0.000037 0.0000843 0.0000765800 0.00005 0.000029 0.0000826 0.0000755

1000 0.00004 0.000023 0.0000829 0.0000752

Flexible Cables

Area SqmmAl / Cu

1.5 0.01332.5 0.00798

4 0.00495

Approx. ACReactance at 50Hz

Approx. ACresistance at 20 deg

Approx. ACresistance at 90 deg


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Copper Conductor

AC Resistance Reactance400 0.00000724 0.00000292600 0.000 0.00000229800 0.000 0.000

1000 0.000 0.0000017771200 0.000 0.000001381500 0.000 0.000001131600 0.273 0.0932000 0.245 0.0822500 0.182 0.0673000 0.140 0.0553500 0.124 0.0484000 0.110 0.0434500 0.094 0.0405000 0.083 0.330

6300 0.074 0.031

Aluminum conductor

AC Resistance Reactance400 0.00001202 0.00000271600 0.00001134 0.0000023800 0.00000797 0.00000175

1000 0.00000642 0.000001541200 0.00000404 0.00000144

1500 0.00000335 0.000001091600 0.00000287 0.00000093 Shearing Most Useful2000 0.00000023 0.000000742500 0.00000184 0.000000633200 0.00000142 0.000000523500 0.00000122 0.000000394000 0.00000110 0.000000324500 0.00000096 0.000000265000 0.000 0.00000017

Ampere Rating

Ampere Rating


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1.Short Circuir Calculation