Sigre 2015. — 8 с.
Texas A&M University, United States of America, [email protected]This paper relates to a new protection paradigm where corrective, adaptive and predictive relaying features are introduced.
The value of corrective relay operation can be assessed by looking at the situations when relay mis-operations occur. Analysis of recent historical blackouts has revealed that the power system catastrophic events happened following consecutive cascading events such as transmission line outages, overloads and malfunctions of protective relays. In general, cascade events can be divided into two time stages. In the first stage, successive events are slow enough to be analyzed as steady-state. If no action occurs to restore the grid to the normal operation condition, and meanwhile several major disturbances occur causing fast transient stability violation, a system collapse will happen. This stage is named as second or irreversible stage. Early prediction and proper control actions during the first stage can prevent further unfolding of cascade events.
When a transmission line is tripped due to the operation of protective relays, a relay mis-operation detection tool can confirm whether the relay operation was correct or the transmission line was healthy and incorrectly tripped. The advantages of such tool could be itemized as higher reliability and redundancy, faster restoration and enhanced critical decision making during disturbances. This tool can also support the reliable implementation of new applications such as transmission line switching (topology) control.
