AREVA T&D UK LIMITED

Patent application number	Title	Published
AREVA T&D UK LIMITED Patent applications
20090009349	METHOD OF DETERMINING VOLTAGE STABILITY MARGIN FOR LOAD SHEDDING WITHIN AN ELECTRICAL POWER SYSTEM - A method of monitoring voltage stability within an electrical power system comprises the steps of establishing a dynamic power system stability margin based on an operating characteristic of the power system; indicating that the power system has become unstable when the dynamic power system stability margin falls below a predetermined value; and initiating dynamic load shedding and/or restoration depending on stability margin.	01-08-2009
20090009181	Current Differential Protection Relays - In the field of current differential protection relays there is a need for improvements in or relating to the protection relays to allow them to accommodate current transformer saturation while maintaining a desired degree of reliability. A method of operating a current differential protection relay following a fault, the protection relay being electrically coupled to a protection zone of an electrical power system, comprises the steps of establishing a fault condition by discriminating between an internal fault inside the protection zone and an external fault outside the protection zone; and modifying the sensitivity of the protection relay according to the nature of the fault condition.	01-08-2009