Network Fault Analysis

Application Overview:

• See Network Fault Analysis Setup for more details on user input options for this application.

• For general details on running an application, selecting and displaying output variables, see Running DEW Applications.  

• The Available Output Variables for the application are described in the last section of this topic.

Network Fault Analysis determines the results of a fault occurrence at selected components in a system.  The user may select components individually or run for entire circuits.  

Application Run / Results:

Two output formats are available when running Network Fault Analysis.  The user can generate the Network Fault Analysis Report, as well as cycle the displayed network through the output variables selected from the Analysis / Setup for Results Display menu.

Network Fault Analysis Report:

Running the application with the report option selected produces a text output upon completion of the analysis.  The report format depends on analysis mode selected.

When reporting for a picked component, the report consists of 4 major sections:

1. Total Fault currents at Picked Component:
    

• Bolted Ph to G -  Phase-to-Ground fault current, without fault impedance (Zf)

• Bolted Ph to G w/ Zf  - Phase-to-Ground fault current with fault impedance

• Bolted Ph to Ph - Phase-to-Phase fault current fault impedance

• Bolted 3 ph - Three phase fault current without fault impedance

• Bolted 3 ph w/ Zf - Three phase fault current with fault impedance  
   

2. Reflected currents at transformers - Phase-to-Ground, Phase-to-Phase and Three Phase currents reflected currents at transformers, as applicable.

3. Fault Currents Through Other Components - Currents that will flow through other components that have their display results property enabled, due to Phase-to-Ground, Phase-to-Phase and Three Phase faults at the picked component.

4. Current from Distributed Resources - Fault currents resulting from distributed resources (e.g. generators, cogenerators, etc), as applicable.

Note: Results in the first three sections consider only the fault current contribution from the substation.

See Sample Reports - Network Fault Analysis for Picked Component

When reporting for selected circuits, the report consists of one major section for each circuit selected, listing all fault currents (Phase-to-Ground, Phase-to-Phase, Three Phase) and Thevenin Impedances for three-phase components.

See Sample Reports - Network Fault Analysis for Selected Circuits

Available Output Variables:

For general details on running an application, selecting and displaying output variables, see Running DEW Applications.  The output variables available for display from the Network Fault Analysis application are described in the following table.