Simulation and testing of the over-current protection system based on IEC 61850 Process-Buses and dynamic estimator

This paper presents a successful real-time simulation and testing of the over-current protection system based on IEC 61850-9-2 Sampled Measured Values communication and a dynamic estimator using a simulator of the real-time environment. The TrueTime software and the Matlab Simulink had been integrated into the real-time environment simulator for testing real-time performance of the IEC 61850 Process-Bus and the protection system. Performance of the IEC 61850 Process-Bus communications can be affected by many factors like, bandwidth and cable length. These factors will affect the measurements provided to protective relays through Process-Bus due to delay or loss of some Sampled Measured Values. The purpose of the tests in the real-time environment simulator is to show how an over-current protection relay would react to operation conditions of the IEC 61850 Process-Bus. Understanding how a physical protection system can respond to IEC 61850 Process-Bus communication will give engineers the confidence that is needed to assure that the system under consideration will behave as acceptable.