How instantanious short circuit current is calculated? its
formula?
- 1 Answers
- 3356 Views
- I also Faced
- E-Mail Answers
Answer Posted / sriram
This calculation Applicable for 3 phase fault.
Transformer:
Step 1:
First calculate Full load current
I(F.L)=(KVA*1000)/(V*1.732)
Step 2:
Calculate multiplier factor(M)=100/%Z
Step 3:
I(sc)=I(F.L)* M
Motor
Step 4:
F=(1.732*L*I(#phase))/(c*n*E(line-ground))
step 5:
M=(1/(1+F))
step 6:
I(s.c)sym rms=I(s.c)*M
I(s.c) MOTOR=4*I(s.c)
Total fault current =Is.c(trans)+Is.c(Motor)
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
what would u consider to be the basic purchase order information you would need to proceed with a cable inspection assignment?
Please help me regarding my one concern. - During earth pit testing we noticed that the Clean earth pit and dirty earth pit showing continuity (Resistance value - 5ohm) . I want to know that if both earth pit have separate location and there is not internal looping between PIT then why such continuity is showing on it . Because of this issue the field side all earthing point showing short. In PLC panel we are providing two types of earthing cable which is coming from separate earth pit (Clean and Dirty earth pit) because of earth PIT showing short our PLC is not complying spec . please help regarding this issues.
what is meant by moulded case circuit breaker ?
how can we calculate the ratio of caustic soda and water in lrs.
what will be happen if earth point is being used for as a neutral point for raw power , and same will be used for ups earthing
What is capacitance?
what is the difference between 2 way and 4 pole selector switch???
how generator load test is conducted?what are the steps?
how to find the multiplication factor for digital energy meter and analog energy meter
What is the voltage gain or transfer function of amplifier?
I have doubt that the supply HZ (very low or high than rated ) may affect the power factor. is it true. ?
what is diff. between earthing grid,earthing mess, earting grid?
What is the effect of solar radiation on the design of an Isolated Phase Busduct?
Can anyone please provide me details of MCCB/Contactor/SFU rating calculations for a motor feeder..for example 50 kw.. not from type-2 cordination chart. i want manual calculations..
what is the major difference between LIBBP & HIBBP.. which one is most preferable..
