Viewing Power Flow Results in Study Mode

Power Flow results are calculated each time you display the Device Details Power Flow Results. To view Power Flow results for a device in study mode, follow these steps:

1. Start the Viewer and enable Device Details.

2. Set the Viewer to Study Mode. (When you change to Study Mode, the system prompts you to set the Study Session Parameters, as described in the next section.)

3. Select the device for which you want to view Power Flow results. (Click the left mouse button to select.) The Device Details dialog box appears.

4. Click the Power Flow Results tab. The Power Flow Results tab is populated with the calculated results.

5. Click the Power Flow Options button to view or modify the Study Session Parameters.

Understanding the Power Flow Study Mode Load Scenario

The Power Flow Study Mode Load Scenario tool allows you to set the parameters for network conditions that the power flow calculations will be based upon.

Load Profile

Allows you to setup the load and generation profile curves to be used for the study session.

• The Real-Time option will utilize the current (real-time) loading and generation values.

• The Specific Hour option will utilize the forecast loading and generation values for the selected date and time.

• The Specific Period option allows you to define a unique combination of load and generation profiles for a particular day type, hour of day, temperature, and weather conditions.

These parameters allow you to simulate a variety of scenarios.

For the Specific Period option, the following information is used:

• Hour: select the hour to use for calculating results (0-23, Daily Peak).

• Day: select the type of day. In the product configuration, the Day options are Weekday, Weekend, and Seasonal Peak with capacitors on or off.

Additional options allow you to select generation schedules for various distributed generation units based on the fuel that supplies the unit. The product configuration has the following options:

• Temp (F): Chose the temperature range to use for adjusting load conditions or temperature based limits. For each real-time based day type (weekday, weekend), multiple sub profiles exist representing different temperatures bands to characterize how the load behaves on that type of day for a range of temperature (for example, 80°F - 90°F). Using temperature as a parameter allows better simulation results to be achieved. For example, a weekday at 60°F versus a weekday at 100°F will have far different loading conditions. For temperature based limits, this parameter will drive the limits used for power transformers and conductors. Each of these device types will have predefined limits for a temperature band and this value will drive the limit used in the analysis.

Note: The temperature parameter will be grayed out if both Temperature Based Profiles and Temperature Based Limits have been turned off. These can be set using SRS rules USE_TEMP_PROFILES and USE_TEMP_LMITS, respectively. If temperature based profiles are turned off, it will be expected that a customer will provide a single profile for each load that will be used for all ranges of temperatures.

• Wind Speed (mph): select the wind speed available for wind power sources.

• Cloud Cover: select the amount of cloud cover (for example, Clear, Mostly Clear, Partly Cloudy, Mostly Cloudy, Cloudy)

• Residential Battery: select the profile for battery charge/discharge cycles (for example, On, Off).

• Residential Fuel: select the profile for fossil fuel use (for example, On, Off).

• Utility Battery: select the profile for utility scale battery charge/discharge cycles (for example, On, Off).

• Utility Fuel: select the profile for fossil fuel based units (for example, 25%, 50%, 75%, 100%).

• DR: select the profile for demand response objects (for example, On, Off).

Scaling Factor

The Scaling Factor is a number that modifies the loading conditions for the selected profile. Typically a value of 1.0 is used; if you want to study the impact of increased or decreased load, enter values greater than or less than 1.0, respectively.

Cold Load Pickup

Allows you to determine if de-energized loads should be treated as Cold Loads.

Limits

• Limit Type is either Normal, Emergency (Long Term), or Emergency (Short Term).

• Season allows you to select the simulation season.

• Summer

• Fall

• Winter

• Spring

Note: The season drop‑down list will only be displayed if seasonal limits have been configured. If a project is using temperature based device limits, this option will not be available.

• High Voltage Limit is the high voltage to use for reporting limit violations.

• Low Voltage Limit is the low voltage limit to use.

To request a Power Flow solution using the entered values , click OK. When the system is finished calculating the results, the Power Flow Study Mode Load Scenario window will close and the results will be displayed in the Power Flow Results tab on the balloon details dialog box.

Note: Values are not saved when you apply them. The next time you open this dialog box, the last saved values (rather than the last applied values) will be displayed. If no values were previously saved, real-time values will be used.

• To reset to previous values, click Reset. If you want to request a solution for the default values, click OK.

• To close the dialog box without any action, click Cancel.