Sampled values packet loss impact on IEC 61850 distance relay performance

Modern substations are implementing Switched Ethernet based IEC 61850-9-2 Process bus communication networks for realizing their protection functions. Packet loss is a common phenomenon and plays a crucial role in the implementation of communication network based time-critical real time protection applications of power system. This paper presents the modeling and simulation of communication based digital distance relay protection scheme using MATLAB. In the first phase, the scheme is tested under various fault types, locations and fault resistance conditions to verify the operating performance of simulated distance relay model. In second phase, it is tested under sampled values packets loss condition to analyze the impact of lost data on the trip time performance of relay model. The result shows that the lost sampled values data in input signals adversely affects the tripping of distance relay.