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The move to PWM-based waveforms with substantial high frequency content results in much greater capacitive currents in the stress grading (SG) material and the conductive armor tape (CAT) which increase power dissipation and electric fields within these elements. Treating this subject numerically is challenging for several reasons, viz., (i) the need to measure SG nonlinear properties as a function...
As a university feels lack of possibility for the circuit breaker research, several approaches are described. Four technical fields are explained, and they are 1) arc quenching phenomenon, 2) circuit switching phenomenon, 3) MEMS sensor application technology and 4) new material application technology. Two examples are shown from the field 1). The electron density measurement by a Shack-Harmann sensor...
To identify the influence of current interruption on the insulation strength of vacuum interrupters (VIs), the voltage to time-lag characteristics of VIs are measured from nanoseconds to several microseconds range before and after current interruption. The breakdown voltage increases after the current interruption for VIs with Cu–Cr contacts. The field emission current of contacts are also...
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