Acoustic emission method as a tool of partial discharges indication

被引:4
作者
Korenska, Marta [1 ]
Pazdera, Lubos [1 ]
Manychova, Monika [2 ]
机构
[1] Brno Univ Technol, Fac Civil Engn, Dept Phys, Brno 60200, Czech Republic
[2] Brno Univ Technol, Fac Civil Engn, Dept Bldg Struct, Brno 60200, Czech Republic
关键词
acoustic emission; high voltage; insulated material; electric discharges; cavity; standing waves; amplitude; average frequencies; acoustic signal duration;
D O I
10.1504/IJMPT.2011.045468
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present paper deals with a method of tracking the partial discharges using the acoustic emission method. The quantity under study was the overshoot counting rate in acoustic emission signals. The subject of the experiment was a high-voltage generator rod, which had been provided with Relanex insulation. Acoustic signals, which were generated in the Relanex insulation layer, were picked up by wide-band sensors. Measurement results proved that electric discharges in a cavity are accompanied by the generation of mechanical oscillations, which in turn act as a source of standing waves in the cavity and standing waves in the rod and the insulator. The frequency spectrum therefore extends from the rod fundamental oscillation mode (i.e., 3 kHz) up to the cavity natural frequencies (in the order of several MHz).
引用
收藏
页码:209 / 218
页数:10
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