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For a raise of the miniaturization and reliability of various electric power apparatuses, it is important to clarify the partial discharge characteristic in their insulation part. In many case, partial discharge may occur under the non-uniform field. So, it is necessary to understand the partial discharge characteristic under non-uniform electric filed. Partial discharge inception voltage (PDIV) was...
The partial discharge (PD) generated by the surge voltage is an issue in inverter-fed motor for the reliability of the electrical insulation. The measurement of PD waveform with a wide frequency range is one way to investigate the PD phenomenon. The PD waveform with a wide frequency range may imply information such as mechanisms beginning from initiation of avalanche and its propagation. Authors have...
To understand treeing phenomena in MgO/LDPE nanocomposite under ac voltage application, treeing breakdown properties and partial discharge inception voltage were investigated. Tree inception voltage increased with increasing filler content. Time to bridge counter electrode, time to breakdown and time-lag to breakdown also increased with addition of MgO nano-filler to LDPE. From these results, it becomes...
Composite insulation system of liquid nitrogen (LN2) and solid insulator, which are widely employed in high-temperature superconducting power equipments, can be deteriorated by partial discharge (PD) generated in highly stressed region such as a triple junction. To investigate the PD mechanism, an individual current waveform of PD generated around the triple junction in LN2 or gaseous nitrogen (GN...
We have been studying the breakdown characteristic of air-polymer composite insulation due to partial discharge (PD) under repetitive pulse voltage application using needle-plane electrode system. The purpose of this study is to clarify the effect of varied humidity on threshold frequency at the breakdown air polymer composite insulation caused by partial discharge in air gap. The result showed that...
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