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in Powerworld there is a function called ''line flow pie'' which indicate the percentage of load of the line. But what is it? I think that it is the ratio between the current on the line and its nominal value times 100. Is this correct?

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From the documentation:

The line flow pie charts are used to indicate the percentage MVA, MW, or Mvar loading of a transmission line or a transformer. The degree to which the pie chart is filled shows how close the device is to its limit (provided the device has a nonzero limit). A line flow pie chart becomes completely filled when the device's flow meets or exceeds 100% of its rating.

So rather than current, it is indicating power (Real, reactive, or true).

https://www.powerworld.com/WebHelp/Content/MainDocumentation_HTML/Line_Flow_Pie_Charts_on_Onelines.htm

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