Step Voltage-Earth rods around the building
Step Voltage-Earth rods around the building
(OP)
Hi,
I have a building with three 11/6.6kv, 5MVA transformers with MCC's as loads.Proposed Grounding system is a single row of ground rods at every 8 meter around the periphery of a building interconncted by a cable (of suitable earth fault current carrying capacity).
I want to put this information in a power system analysis software like "CYMGND'.But software is asking for something like a "earth grid configuration".But in my situation,
it is not like a continuous grid/mat since building foundation is coming in between them.
How can I calculate the step and touch voltage?If I take mean value of soil resistivity and concrete resistivity & consider it like a continous mat-is it o.k??
thanx in advance
Abraham
I have a building with three 11/6.6kv, 5MVA transformers with MCC's as loads.Proposed Grounding system is a single row of ground rods at every 8 meter around the periphery of a building interconncted by a cable (of suitable earth fault current carrying capacity).
I want to put this information in a power system analysis software like "CYMGND'.But software is asking for something like a "earth grid configuration".But in my situation,
it is not like a continuous grid/mat since building foundation is coming in between them.
How can I calculate the step and touch voltage?If I take mean value of soil resistivity and concrete resistivity & consider it like a continous mat-is it o.k??
thanx in advance
Abraham






RE: Step Voltage-Earth rods around the building
RE: Step Voltage-Earth rods around the building
Keep in mind that touch and step voltages are caused by fault current flowing through the earth. If the source of the fault current is the secondary of a grounded wye transformer winding where the neutral is connected to the grid, then the fault current doesn't flow through the earth. Touch and step voltages only exist for faults with a source remote from the grid.