This document deals with usage of sampled values for protection functions in medium voltage networks. IEC 61850-9-2 brings solution to distribution of current and voltage values measured by sensors. Sampled values could be used for various protection functions. One of the most extensively used type of protection is overcurrent protection relay. If settings of parameters are set wrong in overcurrent protection it can lead to big catastrophe. In this document there is described overcurrent protection relay model which is programmed in LabVIEW and it is the first part of programming a central protection relay model.

IEC 61850 standard has achieved the required development for the communication in the Substation Automation Systems (SASs) by allowing to apply the high-speed peer-to-peer communications that is the basis of metering, control and protection applications in SASs. Nevertheless, an appropriate test method for performance testing of IEC 61850 compatible with protection relays and systems is an urgent need to ensure the protection functions of relays will operate as designed. This paper reviews requirements (software and physical devices) of the conventional protective relay testing and the performance testing of IEC 61850 based-relays. It also describes a comparison between the functional testing of conventional IEDs and testing of communications based IEDs.

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