Power-system state estimator availability analysis

A simple technique for determining the probability that a given node will be observable, based on measurement-data availability, is presented. In contrast to other methods, the state-estimator nodal-estimate reliability analysis can be carried out without using a computer, and, because all the individual nodal availabilities are found, different nodes can be assigned different availabilities during the meter-placement design. The availability analysis also determines the largest number of measurements about each node which can simultaneously be removed or lost without causing a certain loss of nodal estimate observability, when the remaining measurements are processed. This `sufficient¿ test of nodal estimate observability during bad-data with the `power of the J(x) test¿ in meter-placement design.