Fault Level Calculation

Fault Level Calculation Author: LJ (contact [email protected] for more details) Case: International Stadium Project, Kochi 1.0 Rating of 110/11KV at Kaloor KSEB SubStation = =12.5MVA 2.0 Percentage Reactance of above transformer = 0.095 Considering Future expansion of "one more transforemer, PercentageReactance" =R1% 0.0475 3.0 Base MVA assumed for calculation =M = 12.5MVA 4.0 Fault Level at 11KV Bus of KSEB assuming 110KV M*100 as an infinate bus =F1 = ------ = 263.16MVA R1 5.0 Fault Level at 11KV incoming side at proposed Substation at aite = F1 = 263.16MVA F1*1000 6.0 Max, Short circuit current at 11KV = ------- = 13812Amperes √3*11 ============ 7.0 Rating of 11KV/433V Transformer = = 1600 KVA 8.0 Percentage Reactance of Transforemer = R = 6.25% 9.0 Percentage Reactance of the Transformer on R*M Base MVA =R2 = ---- = 48.83% 1.60 10.0 Total %Reactance up to 433V bus = R3 = R1+R2 = 53.58% M*100 11.0 Fault Level at 433V bus = F3 = -------- = 23.33 MVA R3 F3*1000 12.0 Maximum Short circuit Current at 433V = ---------- = 31108.00 Amperes √3*0.433 ================

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Transcript of Fault Level Calculation

5/28/2018 Fault Level Calculation

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Fault Level Calculation

Author: LJ (contact [email protected] more details)

Case: International Stadium Project, Kochi

1.0 Rating of 110/11KV at Kaloor KSEB SubStation = =12.5MVA

2.0 Percentage Reactance of above transformer = 0.095Considering Future expansion of"one more transforemer, PercentageReactance" =R1% 0.0475

3.0 Base MVA assumed for calculation =M = 12.5MVA

4.0 Fault Level at 11KV Bus of KSEB assuming 110KV M*100as an infinate bus =F1 = ------ = 263.16MVA

R1

5.0 Fault Level at 11KV incoming side at proposedSubstation at aite = F1 = 263.16MVA

F1*10006.0 Max, Short circuit current at 11KV = ------- = 13812Amperes

3*11 ============

7.0 Rating of 11KV/433V Transformer = = 1600 KVA

8.0 Percentage Reactance of Transforemer = R = 6.25%

9.0 Percentage Reactance of the Transformer on R*MBase MVA =R2 = ---- = 48.83%

1.60

10.0 Total %Reactance up to 433V bus = R3 = R1+R2 = 53.58%

M*10011.0 Fault Level at 433V bus = F3 = -------- = 23.33 MVA

R3

F3*100012.0 Maximum Short circuit Current at 433V = ---------- = 31108.00 Amperes

3*0.433 ================
5/28/2018 Fault Level Calculation

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