The aim of this work is to create a theoretical analysis of the problem of the exciting and de/exciting systems of synchronous alternators, an analysis of their functions and the problem of their disturbances, in connection with this being the following analysis of the asynchronous operation of the generator which appears with a big drop or with total loss of excitation. Further, it is necessary to carry out an analysis of the marginal loading and of the transient phenomena during the loss of excitation with the following summary of the knowledge and of the possibilities of the excitation loss diagnosis. The next task is to get acquainted with the possibilities how to protect machine protection terminal REM 543 produced by the ABB company, as well as with their following configuration and testing, for which we use the testing equipment of the protections TZO 3 produced by EGÚ Brno company. The primary goal of this work is to create a detailed direction for the calculation of the parameters necessary to put up the protection function UE6High of the REM 543 terminal, further to create the configuration of the protection communication and of the TZO 3 test device with PC, as well as to put up the REM 543 terminal including the putting up of the test TZO 3 device. The UE6High function works on the principle of the distance protection which is the most extended and the most effective to detect the loss of the synchronous alternator excitement. By means of the calculated values we carry out the putting up in order to pull out the MHO characteristic on the impedance level. The work also contains the measured values of the switch characteristic on the impedance level for various putting up of the rapidity of change of the excitement working quantities like voltage, current and phase shift measured within all three phases
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