PowerFactory provides a built-in functionality to adapt the power of selected loads to result in the measured values at the beginning of a feeder. Using the attached example, the following steps explain the usual approach to perform the load scaling:

The initial load flow results in a value of 4.02 MW at the feeder; the measurement however shows a value of 3.5 MW.

1. Definition of the feeders: Right-click on the line (in general the branch element) close to the up-stream cubicle (the element is then half selected) and click on Network Groupings/Feeder/New…. Enable the flag "Feeder is supposed to be operated radially".

2. Select the desired type of scaling (e.g. active power) in the Load Flow tab of the newly created feeder and enter the measured value which should be the result of the scaling (e.g. 3.5 MW).

3. All loads to be scaled must be selected. In the Load Flow tab of the corresponding load elements, enable the Adjusted by Load Scaling option. In the attached example, loads NS1 and NS2 are scaled, NS3 is fixed to maintain its nominal value (e.g. due to known/measured values).

4. To perform the load scaling, enable the Feeder Load Scaling flag in the Basic Options tab of the Load Flow Calculation command (ComLdf) and execute the calculation. The feeder results should now be as defined. To obtain the scaling factor, open the Network Model Manager, select the category Feeder (ElmFeeder) and go to the Flexible Data page. The c:scale calculation parameter shows the value used to scale the selected loads.

5. To take over the scaling factor for each of the selected loads, press the Update Database button in the main icon bar.