Ashdgee
Electrical
- Jun 12, 2019
- 23
Good day
I have been asked to do a protection and grading study for a 11kV distribution network (doing in ETAP). One of the feeders coming out of the main 11kV substation has a series reactor installed on it, to limit the fault current seen by the downstream substation.
The client has given me everything like cable size and length, fault levels on upstream S/S etc. But I requested info of the reactor and the operator said doesnt have the reactor specs, besides letting know that it is a 20MVA, 3 phase.
ETAP wants the positive sequence and zero sequence of this 3 phase series reactor. I asked for the operator to check nameplate but too old to see. Anyone here who has worked with an almost similar unit? I just need the typical impedance values so that I can run the Short Circuit calculation. Your help is appreciate as this has become an urgent request.
I have been asked to do a protection and grading study for a 11kV distribution network (doing in ETAP). One of the feeders coming out of the main 11kV substation has a series reactor installed on it, to limit the fault current seen by the downstream substation.
The client has given me everything like cable size and length, fault levels on upstream S/S etc. But I requested info of the reactor and the operator said doesnt have the reactor specs, besides letting know that it is a 20MVA, 3 phase.
ETAP wants the positive sequence and zero sequence of this 3 phase series reactor. I asked for the operator to check nameplate but too old to see. Anyone here who has worked with an almost similar unit? I just need the typical impedance values so that I can run the Short Circuit calculation. Your help is appreciate as this has become an urgent request.