A new method is presented for finding Β coefficients expressing loss in a power system as a function of power input. The computer program necessary to find these loss (B) coefficients is very simple, and transformations of variables are not required. The method takes advantage of the fact that partial derivatives of voltage phase angles with respect to any plant power output are independent of system generation schedules and load levels, as shown in a previous paper. Many of the usual assumptions in calculating Β coefficients are eliminated. Copyright © 1968 by The Institute of Electrical and Electronics Engineers, Inc.
