Gounding of an industrial facility
Gounding of an industrial facility
(OP)
In designing a grounding system for an industrial system, I typically focus on all faults that might occur on the secondary side of the main transformer. These are small facilities, less than 3 MVA. The ground grid and rod are sized large enough to carry all fault current, as are equipment grounding conductors. But all of my calculations are based on faults on the secondary. Recently I was questioned about whether or not the ground system could handle faults on the primary. For a small industrial facility without a substation, what is the design engineer's responsibility for faulting on the primary side of the transformer? Of course these cannot be cleared by the facility, but should the utility faults be part of the ground design?
Thanks
EE
Thanks
EE






RE: Gounding of an industrial facility
In a case of a fault on medium voltage side of such a transformer-usually phase-to-ground-to-phase-the ground grid potential could rise very high. The Utility has to state the fault current level in each such point-it is my opinion.
RE: Gounding of an industrial facility
RE: Gounding of an industrial facility
RE: Gounding of an industrial facility
For up to 24 kV medium voltage system the power indicated it is 500 MVA.
So, the system impedance has to be Zsc=V[kV]^2/500. If no power station is in vicinity X"=Zsc.
RE: Gounding of an industrial facility
RE: Gounding of an industrial facility
EE
RE: Gounding of an industrial facility
RE: Gounding of an industrial facility
RE: Gounding of an industrial facility
EE