论文信息 - Comparison of ultrasonic, electrical and UHF characteristics of partial discharge emission in oil/paper insulation systems

Comparison of ultrasonic, electrical and UHF characteristics of partial discharge emission in oil/paper insulation systems

In this paper, partial discharge measurements on artificial specimens simulating corona, surface and internal partial discharge in paper/oil insulation systems are discussed. Focus is made on a comparative analysis of signals derived through both conventional (conducted electrical signals) and unconventional (acoustic and UltraHigh Frequency emission) techniques. The results indicate that unconventional techniques can provide evidence of partial discharge activity, but are not sufficient to assess the severity of the detected phenomenon. This requires apparent charge measurements conducted through conventional detectors. In the case streamers are observed, narrowband detection (with bandwidths below 50 kHz) must be used to get an accurate estimate of apparent charges.

[1] J. G. Anderson. Ultrasonic Detection and Location of Electric Discharges in Insulating Structures [includes discussion] , 1956, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[2] H. Debruyne,et al. About the significance of PD measurements in liquids , 2003 .

[3] Ronald Harrold. The Relationship Between Ultrasonic and Electrical Measurements of Under-Oil Corona Sources , 1976, IEEE Transactions on Electrical Insulation.

[4] Li Ming,et al. Directivity of acoustic signals from partial discharges in oil , 1995 .

[5] G. Montanari,et al. Digital detection and fuzzy classification of partial discharge signals , 2002 .

[6] P. von Glahn,et al. Correlations between electrical and acoustic detection of partial discharge in liquids and implications for continuous data recording , 1996, Conference Record of the 1996 IEEE International Symposium on Electrical Insulation.