Abstract In paper, the problems of measurements overvoltage attenuation in a contact line have been described. The investigations have been conducted with telematics synchronization measurements on the test track of the Railway Institute and the Railway Institute Laboratory in Warsaw. The investigations consisted in the introduction of voltage kicks directly to the contact line or its laboratory model with the use of a kick generator. In this publication, the measurement systems used in both the field and the laboratory investigations have been shown. The publication contains also the recorded results of the investigation. The courses of both the voltage and current impulses have been analysed. The results of this analysis allowed to elaborate the conception of the varistor protection of the contact line against overvoltages.


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