Network Fault Analysis Setup

The Network Fault Analysis setup dialog can be launched from the Analysis menu's Setup for Analysis Execution dialog by selecting Network Fault Analysis (in the Analyses Available frame) and then choosing the [Edit Analysis Parameters] command.

Fault Analysis For:

• Component to be Picked - running application prompts user to pick the component where fault will be evaluated.  After component selection (with mouse pointer finger), the Network Fault Analysis Report is generated.
   

• Selected Circuits - running application will calculate fault currents for individual faults at components throughout Circuits Selected for Analysis from the Setup for Analysis Execution dialog.

• Analyze All Primary Cmps - when selected, directs application to analyze faults at all primary components in selected circuits.  If unselected, only components with their "Display Results" property set On will be considered in the analysis.  

• Run in Fast Mode - when selected, the Thevenin impedance at a location will be set equal to the already calculated value at the feeder path for that location, instead of calculating the value by the Power Flow based numerical method.  

  Note!

  Running in "Fast Mode" may result in significant variation when used with radial circuits.

Report:

• Generate Report - running application generates the "Network Fault Analysis Report" for the considered fault locations.

• Assign a Name - allows user to specify the file name and destination path for the report.  Note: Use this option to avoid overwriting previous reports.

• Default Name - application automatically assigns the default report name (i.e. NetworkFaultAnalysis.rep) and overwrites any previous versions in the default destination (DEW Reports) folder.

Arcing Impedance:

• ___ R Ohm - defines resistance value to be inserted between any faulted phase and a neutral point for three-phase and single-phase faults.

• ___ X Ohm - defines reactance value to be inserted between any faulted phase and a neutral point for three-phase and single-phase faults.

Note: For grounded systems, the ground will be treated as the neutral.

Capacitors:

• Ignore - when selected, existing capacitors will be ignored  during pre-fault and post-fault analysis.

Options:

• Analyze:

• Loaded System - when selected, pre-fault voltage and current values are calculated for the system with existing loads in place.  

• Unloaded System - when selected, pre-fault voltage and current values are calculated for the unloaded system, with any existing loads being ignored.

• Use Circuit Measurements - directs application use of existing circuit measurements for calculation of pre-fault voltage and current values.

• Assume Zero Pre-fault Generation at All DGs - directs application assumption of no power generation by any Distributed Generation units before the fault event.  

• Assume Pre-fault Load Currents Unchanged at Post-Fault - available only when analyzing Loaded Systems, directs application assumption that load currents existing prior to faults will remain the same during the faults.  

• Include Load Currents in Post-Fault Currents - available only when run for Picked Component on Loaded System, directs application to add pre-fault load currents to post-fault currents when calculating post-fault flows throughout the system.

• Include Arcing Impedance in Ph-to-Ph Faults - directs application to include arcing impedance in phase to phase faults.  

• Calculate Reflected Voltages in Customer Level Voltages - available only when run for Picked Component, directs application to calculate reflected voltages in terms of defined customer level voltage (i.e. 120V).

• Allow Network Protectors to Open - directs application to open network protectors if reverse flows are detected in pre-fault analysis.  

General Menu Items: