The PMS actuators will send incremental set-point changes
to gas turbine governors and to generator and transformer
AVRs. These set-point changes control the system frequency
and busbar voltages and thus are very important for correct
power system operation. All decisions made by the PMS are
based on the data that has been collected from the various
devices of the power system. It is essential that only valid data
be used. Corrupt data can cause the PMS to send incorrect
set-point changes and drive the power system to an abnormal
operating condition.