Load Estimation

Application Overview:

• See Load Estimation Setup for 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.
   

The Load Estimation application calculates loads for all user selected circuits at the selected time point

• If more than one time point is selected, Load Estimation results apply to the earliest time point selected.

• If no time points are selected, Load Estimation runs for the first time point.

• Loads are estimated for all phases present on line and cable sections and start of circuit components.

• In Grounded sections - Loads are attached phase (A, B, or C)  to ground

• In Ungrounded sections - Loads are connected phase-to-phase (A-to-B, B-to-C, or C-to-A)

• Plotting capability (load versus either distance or time) allows user to select and analyze multiple time points with application.  

Load estimates are developed from various user-specified sources:

• Spot Loads

• Special Loads - where loads vary with selected operating point)

• Customer Class Loads (kWhr, kW/kVAR) -  where loads may vary with selected time point

• Circuit Measurements -  where loads may vary with selected time point

• Target Loads

Factors influencing estimates may include:

• Load growth factors

• Load distribution factors

• Load scaling factors

• Load measurements

• Time- Calendar year, Seasonal (i.e. Winter/Summer), Monthly, Daily (i.e. Workday/Weekend), Time (i.e. hour of day)

• System flow measurements- current, power, reactive power

• Install base- i.e. customers by class attached to line/cable section

Application Run / Results:

See Running DEW Applications for general details on running the application, selecting and displaying output variables.  

Three output formats are available when running Load Estimation.  Along with the standard output display method referenced above, the user can run the application interactively to display results for selected components or generate the Load Estimation Report.  

Interactive Run/Results:

The application runs interactively when the Load Estimation Setup Output Option is set for View Component Results and the Interactive Apps option is set on.  Refer to Load Estimation Setup for more details.  When run in this mode, the user will be prompted with the mouse pointer () to select a component.  Upon selection, the results for the component are displayed in the Load Estimation Results dialog (shown below for component "LN2").  After review, the user can choose [Next] to select another component for review or can choose [Close] to complete the interactive run and exit the dialog.

Load Estimation Report:

Running the application with the report option selected produces a text output, which is displayed upon completion of the analysis.   Reported for each circuit are:

• Total kW Estimated by phase

• Total kVAR Estimated by phase

• Total kW Flow by phase

• Total kVAR Flow by phase

• Total system kW Load by phase
  (Cumulative with referenced circuit, such that last circuit reported gives overall system total)

• Total system kVAR Load by phase
  (Cumulative with referenced circuit, such that last circuit reported gives overall system total)

See Load Estimation Sample Report

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 Load Estimation application are described in the following table.