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This paper investigates the use of new technologies for current and voltage measurement especially in high voltage equipment. It is focused to the principle of low power current transformers with voltage output and to the resistive-capacitive dividers for voltage measurement. The principles of these devises are explained and their advantages and new features in comparison to known inductive and capacitive principles are discussed. An important step into the world of smart grid is the integration of these sensor principles into the new digital communication. A digital interface, realised with a merging unit, is proposed. With this digital interface the values of current and voltage can be distributed to the secondary measurement and protection equipment.