Understanding the Incipient Discharge Activity in Liquid Nitrogen under AC Voltage by Adopting UHF Technique

被引：4
|
作者：
Sarathi, R. [1 ]
Giridhar, A. V. [1 ]
Sethupathi, K. [2 ]
机构：
[1] IIT Madras, Dept Elect Engn, Madras 600036, Tamil Nadu, India
[2] Indian Inst Technol, Dept Phys, Low Temp Phys Lab, Madras 600036, Tamil Nadu, India
来源：
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | 2011年 / 18卷 / 03期
关键词：
Liquid nitrogen; insulation; partial discharges; UHF technique; cryogenic; HTSC; PREBREAKDOWN PHENOMENA; STREAMERS; SYSTEM;
D O I：
10.1109/TDEI.2011.5931056
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Incipient discharges formed due to particle movement, corona and surface discharges in liquid nitrogen under ac voltages radiates UHF signals. The frequency content of the UHF signal generated due to particle movement at the point of inception lies in the range 0.5 - 2 GHz. Corona and surface discharge radiated UHF signal which vary with applied voltage. At higher applied voltage to the electrode gap, the UHF signal generated due to surface discharges and corona, have increased energy content of the signal in the frequency range 2 - 3 GHz. It is observed that irrespective of type of incipient discharge formation, multiple discharge action occurs, which could be observed through zero span analysis. Ternary diagram can be used as a condition monitoring tool and could help one to classify the type of discharges (partial discharge/corona/surface discharge) that occurs, for any remedial action, during operation.
引用
收藏
页码：707 / 713
页数：7
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