Consideration of radiated electromagnetic waves from partial discharge based on half-wave dipole antenna model
✍ Scribed by Toshihiro Hoshino; Masayuki Hikita; Hitoshi Okubo
- Book ID
- 102660952
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 715 KB
- Volume
- 126
- Category
- Article
- ISSN
- 0424-7760
No coin nor oath required. For personal study only.
✦ Synopsis
Partial discharge (PD) may take place due to residual defects like metallic particles in SF 6 gas-insulated power apparatus such as GIS. However, the signal of PD occurring in SF 6 gas is very weak and susceptible to external noise in air. Moreover, because of the complicated mechanism of PD, the radiation property of electromagnetic waves from PD has not as yet been clarified. Therefore, it is hard to distinguish the PD signal in SF 6 gas from external noise.
From the above points of view, we have been investigating the radiation mechanism of electromagnetic waves from PD. We measured the polarization characteristics of electromagnetic waves radiated from PD in comparison with those of half-wave dipole antennas. The polarization characteristics of PD were explained by the theory of halfwave dipole antenna, rather than that of an infinitesimal dipole antenna. Moreover, we compared the power spectrum for PD measured using a biconical antenna with that received from the half-wave dipole antenna or infinitesimal dipole. It was found that the power spectrum for PD also corresponded to that for the half-wave dipole antenna with a length of 50 cm.