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To identify the influence of current interruption on the insulation strength of vacuum interrupters (VIs), the V-t characteristics of VIs were measured from nano seconds to several micro seconds range before and after current interruption. The breakdown voltage increased after the current interruption for VIs of Cu-Cr contacts. The field emission current of contacts were also measured before and after...
The electric power is indispensable and its stable supply is always expected. A stable supply needs the real-time observation of load conditions by measurement of power factor. In addition, the various faults have been caused from the harmonic voltage and current. In the authors' laboratory, the sensor, which simultaneously measures both the waveforms of the voltage and current without contacting...
The copolymer of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) is a ferroelectric polymer undergoing polarization reversal as a result of rotational motions of molecules about their chain axes. It requires a very high electric field of approximately 100 MV/m for polarization reversal. Therefore, the thickness reduction below 50 nm is a technological requirement to achieve low-voltage operations...
A metal-ferroelectrics-semiconductor (MFS) capacitor with a ferroelectric polymer as a gate dielectric has recently attracted much interest owing to its potential applications in nonvolatile memory. In order to understand switching dynamics, we performed simultaneous measurements of the charge Q and the capacitance C for Au/vinylidene fluoride- trifluoroethylene (VDF-TrFE) /n-Si structure using a...
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