An analogue computer for automatic determination of system swing curves

IN USING the conventional a-c network analyzer to solve transient-stability problems, it is necessary to resort to a step-by-step process which is both time-consuming and tedious although the power flow data can be obtained at each step directly from the analyzer. The subject of the rapid evaluation of system swing curves has recently attracted the engineering interest and needs the attention that it now seems to be receiving. This paper describes the design features of a 10-kc network analyzer in which computing elements are incorporated in the feedback loop which relates the electric power output with the phase shifter in such a way that a dynamic representation for a transient-stability solution can be directly obtained on the analyzer itself.