OPERATION OF HYBRID CURRENT LIMITER BASED ON HIGH-TC SUPERCONDUCTING THIN-FILM

High-Tc superconducting (HTSC) thin film with an inductive shunt was i nvestigated as the model of a hybrid current limiter based on the supe rconducting-normal state transition, In addition to features previousl y observed in operation of other current limiters, sharp peaks of rath er high frequency were found to appear on the background of a basic lo w-frequency voltage signal, This is attributed to self-oscillations of temperature and current in the superconductor, The influence of the f requency and magnitude of the circuit current on the character of self -oscillations was experimentally investigated, Qualitative analysis of the conditions for appearance of the self-oscillations under de and a c conditions was carried out.