A distance local backup protection scheme based on regional pilot principle

This paper presents a new scheme for distance local backup protection. In this scheme, two main points are included: The first is the distance component that could reliably detect all the faults occurring in protection area; the second is the pilot comparison strategy which is based on the results of distance components. The former employs the setting principle that could meet the requirement of sensitivity when the fault occurs at the end of line where the protection installed. The later could confirm the fault location through the comparison between results of distance components, and then the operating delay time would be flexibly determined depending on fault location. Regional pilot distance local backup protection could make sure that the speed and the selectivity would meet the requirement. Meanwhile, the cooperation between different kinds of protections would be simplified and the improved protection performance of the backup protection could be realized. Through the simulation sample, it can be seen that the protection scheme proposed in this paper could reliably judge the fault, and then the speed and the selectivity of the local backup protection would be guaranteed, meanwhile this scheme partially possesses the ability of fault tolerance.