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HTS coated conductors (CCs) in various apparatuses are subjected to mechanical stresses caused by thermal contraction and electromagnetic forces. The repeated mechanical stresses cause fatigue effects on superconductors which degrade the critical currents and influence AC loss characteristics. Therefore, it is important to have knowledge of the influence of the repeated stresses. In order for the...
We introduce in this paper the sensitivity of two UHF couplers, disc-type measuring electrode and loop-type measuring electrode embedded in an epoxy insulator, for detecting partial discharge (PD) and diagnosing GIS. Each of the couplers has sufficient performance for detecting the electromagnetic waves up to 8 GHz. The attenuation characteristic of electromagnetic waves is changed depending upon...
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