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The increased interest in using ultra-high-voltage (UHV) transmissions has stimulated research in UHV operation characteristic and correlative relay protections. Operational experience in UHV is limited and hence there is a need to model UHV transmission systems and test the operational performance of traditional protection devices already in use on high-voltage (HV) and extra-high-voltage (EHV) systems. This paper presents the development of a test environment based on a real-time digital simulator (RTDS) of a UHV power system model and the results of testing a distance relay using the model. It reveals that the protective zone will be enlarged in the UHV system with shunt reactor compensation and reduced without the compensation. To resolve these issues further investigation is needed and ways of resolving them, including the development of new algorithms, should be examined.