The touch and step voltages associated with the grounding network are directly proportional to the magnitude of the fault current component discharged into the soil by the grounding network . It is therefore important to determine how much of the fault current returns to remote sources or external grounding via the shield wires and neutral wires of the transmission lines and distribution lines connected to the substation under study, in this case, East Central Substation.
In order to be able to determine the actual fault current split, a model of the overhead transmission line network must be built. The description of the circuit is defined in the Input Data Specification section.
The Fault Current Distribution circuit model can be illustrated as a transmission line network consists of three basic elements: i) a Central Site, ii) Terminal Stations, and iii) Transmission lines connecting the Central Site to the Terminal stations.
Steps:
Click the Circuit button located in the Project Toolbox. This will bring the Network Fault Current Distribution window.
Defining the Central Site data.
Defining the fault current sources: these are called Terminals.
Defining the electrical characteristics of the transmission lines connecting the Terminals to the Central Site.
This concludes the data entry session for the Fault Current Analysis module.