Correlation or Radial Distribution Feeder Regulation Variables and Determination of Regulator Voltage Control Limits

A general formula has been developed relating substation bus voltage range, feeder regulator range, and feeder voltage drop and desired feeding-point voltage for any circuit loading from peak to light load. Equations for permissible range of bus voltage for feeders with any voltage drop and load current range have been derived, as well as an equation for maximum permissible feeder drop for a given minimum bus voltage at the time of peak load. Graphs of these equations have been plotted and examples of their application to certain particular circuits presented.