- #1
Ivan001
- 19
- 0
Good evening to everyone!
I'm pretty new in this kind of job, so every help or advice will be helpfull and I will appreciate it.
I know that short circuit current from picture in attachment depends on impedance and reactance of Source MV, transformer example (10kV/0.4kV) and cables. So if I get, calculate all of this impedances I will be able to calculate short circuit current and here begins my problems.
1.) If I have all impedances (sources, transformer, cables) I will be able to calculate short circuit current of each circuit(1,2,3,4). Isc of each circuit is different while the cross section of cables are different, too. But, how to get total Isc on busbar, in attachment it's 9.1kA?
2.) Sometimes when you make a project for some house in village it's difficut, impossible to get all this information about reactance and impedance of transformer and source (MV network), how to calculate Isc in such situation?
3.) How do you calculate Isc for different type of earthing system (TN-S, IT, TT)?
THANK YOU!
Regards,
Ivan
I'm pretty new in this kind of job, so every help or advice will be helpfull and I will appreciate it.
I know that short circuit current from picture in attachment depends on impedance and reactance of Source MV, transformer example (10kV/0.4kV) and cables. So if I get, calculate all of this impedances I will be able to calculate short circuit current and here begins my problems.
1.) If I have all impedances (sources, transformer, cables) I will be able to calculate short circuit current of each circuit(1,2,3,4). Isc of each circuit is different while the cross section of cables are different, too. But, how to get total Isc on busbar, in attachment it's 9.1kA?
2.) Sometimes when you make a project for some house in village it's difficut, impossible to get all this information about reactance and impedance of transformer and source (MV network), how to calculate Isc in such situation?
3.) How do you calculate Isc for different type of earthing system (TN-S, IT, TT)?
THANK YOU!
Regards,
Ivan