Patent ID: 7786735

Claim:
A control system for an electrical power system, the control system including: an electrical corrective device configured to be connected to a multi-phase high-voltage bus of an electrical power system, the electrical corrective device including multiple interconnected individual capacitive or reactive components; a voltage measuring device connected to measure voltages of each phase of the electric power system; a current measuring device connected to measure current between each phase of the electric power system and the electrical corrective device; and a protective device connected to an output of the voltage measuring device and an output of the current measuring device; wherein the protective device includes a controller configured to determine whether an imbalance exists in the electrical corrective device using the output from the voltage measuring device and the output from the current measuring device, the determination being independent of a direct voltage or current measurement associated with the components included in the electrical corrective device and independent of a neutral-ground measurement at the electrical corrective device.