Local band shedding

An effective local-load-shedding scheme has been developed to alleviate equipment overloads in underground transmission networks. It offers a very fast and reliable algorithm where accuracy and speed are traded, depending on the severity of overload. For overloads greatly in excess of short-time ratings, the speed of removing the overloads within the specified time is given higher priority than the accurate minimization of load curtailments. To provide positive and reliable collective action, overloads are overcorrected by shedding more loads than is absolutely necessary, since the excess loads shed can subsequently be restored by partial restoration. The local shedding scheme has been tested by simulation at the Potomac Electric Power Company for a number of single and multiple outages in the 138 kV underground transmission network with good results.<>