Earth fault relay testing

Bachelor thesis deals with an earth fault relay in compensated medium voltage distribution network. At the beginning of the thesis is described the method of operation compensated system and its advantages and disadvantages of using it. In addition, there is explained the definition of the ground fault, its types and there is outlined the method of solution asymmetrical single-phase fault. Thoroughly there is characterized distribution of voltages and currents, which is important for determination of affected and unaffected outlet. Among others, there is described the mode of action the arc suppression coil on caused fault current and also there are presented the auxiliary systems automation. In the next part the basic requirements for protections and its basic kinds are described. Finally the theoretical part describes principle of the earth fault relays and is presented means and methods used for indicate an affected outlet and earth fault localization. In the practical part, follows more detailed description of the protection REM 543 and testing equipment OMICRON CMC 256 +. In addition, there is explained connection process and setting selected functions and modules for testing earth fault relay. Assessment of generated and played transient disturbance records at the end