How To Calculate Earth Fault Current. Calculate IDMT Over Current Relay Time setting. I fault 25 x 100 1732 x 440 x 5 I fault 066 kA.
After all it isnt the same electrons that make up the fault current in the fault location and in the transformer station. To find the value of earth fault current at any point in a network a sum is made of the earth fault impedances in the network between the source of supply including source impedance and the return path impedances. We have assumed the transformer is connected with the infinity bus to get the worse case fault level on the secondary side of the.
Allowable current density I 7571000ρxt Am2.
Allowable current density I 7571000ρxt Am2. Earth Fault is an inadvertent fault between the live conductor and the earth. Where I f a u l t a c t u a l is the fault current in kA. S r is the generator power rating in kVA.
