Observation of corona phenomena at very high direct voltages
作者:
T.E.Allibone,
J.C.Saunderson,
期刊:
IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education, Reviews)
(IET Available online 1986)
卷期:
Volume 133,
issue 8
页码: 569-572
年代: 1986
DOI:10.1049/ip-a-1.1986.0076
出版商: IEE
数据来源: IET
摘要:
Corona currents of negative polarity flowing from a variety of earthed electrodes of small radii of curvature have been measured up to direct voltages of 1000 kV. The upper, high-voltage electrode has been either a sphere of 2 m diameter or a plane of 130 cm diameter (with curved edges). Over a current range extending from 0.5 μA to 2500 μA the current rises very nearly according to the fairly well established equation i =A(V−V0)VwhereV0is the threshold voltage for corona development, an equation applicable to corona in small gaps. Gaps of 25 cm up to 4 m have been studied. The corona is emitted in a series of pulses, generally known as Trichel pulses (1938), each probably lasting less than 1 μsec; the number rises almost linearly with current at least up to a rate of 1 pulse per μs, the maximum rate recorded at 600 kV across a 2.5 m gap. Their amplitude diminishes slightly with increasing voltage, falling from 600 kV to about half their value at 60 kV. Corona currents from earthed points 4 m below a 500 kV DC transmission line can amount to several microamperes.
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