Observation of partial discharge in hexane under high magnification

Stricklett, K.L.; Kelley, Edward F.; Yamashita, H.; Fenimore, C.P.; Pace, M.O.; Blalock, T.V.; Wintenberg, A.L.; Alexeff, I.

doi:10.1109/14.83691

Cited by 43 publications

(10 citation statements)

References 17 publications

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“…Observation of streamer in hexane under both positive and negative DC voltages was reported in [14,15]. The results indicated that negative streamer current waveforms are more regular with an increasing pulse train and positive streamer current waveforms are less regular with intensive pulses superimposed on a continuous current [14,15]. Similar observations of current waveforms in a synthetic ester liquid under DC voltage was reported in [16].…”

Section: Introductionsupporting

confidence: 68%

“…There are limited publications comparing the streamer and breakdown phenomena between mineral oils and ester liquids under DC voltage as past studies focused on hydrocarbon liquids. Observation of streamer in hexane under both positive and negative DC voltages was reported in [14,15]. The results indicated that negative streamer current waveforms are more regular with an increasing pulse train and positive streamer current waveforms are less regular with intensive pulses superimposed on a continuous current [14,15].…”

Section: Introductionmentioning

confidence: 96%

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Streamer characteristic and breakdown in a mineral oil and a synthetic ester liquid under DC voltage

Xiang

Liu

Wang

2018

IEEE Trans. Dielect. Electr. Insul.

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This paper presents experimental studies of streamer propagation and breakdown in a mineral oil and a synthetic ester liquid under both positive and negative DC voltages. A point-plane electrode configuration with a tip radius of 10 µm was used. Characteristics of streamer length, propagation velocity and shape were analysed based on shadowgraph images obtained at a gap distance of 10 mm using a multi-channel ultra-high speed camera. Under positive polarity, the streamers in both liquids propagate in the 2 nd mode; the stopping length of the synthetic ester is longer than that of the mineral oil at the same applied voltage level. However there is no obvious streamer propagation (less than 10% of the gap distance) under negative polarity even when the applied voltage approaches to the breakdown voltage; the streamers in both liquids stay in the 1 st mode. Breakdown tests at various gaps of 2 mm, 5 mm, 10 mm, 20 mm and 30 mm were also investigated. 50% breakdown voltages of the synthetic ester liquid are lower than those of the mineral oil at all the gap distances investigated under both polarities.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 96%

Streamer characteristic and breakdown in a mineral oil and a synthetic ester liquid under DC voltage

Xiang

Liu

Wang

2018

IEEE Trans. Dielect. Electr. Insul.

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“…Different techniques including discharge current measurement technique [4], ultra-high frequency (UHF) technique [3,5] and acoustic emission technique [2] were employed. Various insulating liquids including Hexane, mineral oil and semi-conductive nanofluids (SNFs) have been investigated in these papers.…”

Section: Introductionmentioning

confidence: 99%

“…Various insulating liquids including Hexane, mineral oil and semi-conductive nanofluids (SNFs) have been investigated in these papers. In [4], it described that the partial discharge current is in the form of a pulse train which is corresponding to the linear growth of the streamer. The streamer shape and stopping length in Hexane under dc stress have been studied in [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…In [4], it described that the partial discharge current is in the form of a pulse train which is corresponding to the linear growth of the streamer. The streamer shape and stopping length in Hexane under dc stress have been studied in [4][5][6]. Partial discharges under negative polarity were found to closely resemble the structure and growth of the slowest (subsonic) cathode events emanating from a tip under the application of negative impulse voltages.…”

Section: Introductionmentioning

confidence: 99%

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Inception and breakdown voltages of insulating liquids under DC stress

Xiang¹,

Liu²,

Wang³

2016

2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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Abstract-This paper investigated the streamer inception and breakdown properties of a mineral oil and a synthetic ester liquid under DC stress up to 100 kV. To observe the effect of tip radius on streamer inception, the point-plane electrodes configuration with a fixed gap distance of 10 mm and point electrode with the radii of 5 µm, 10 µm, 20 µm and 50 µm were used. To observe the effect of gap distance on breakdown voltage, a point-to-plane electrode configuration with a fixed tip radius of 10 µm and variable gap distances of 2 mm, 5 mm, 10 mm, 20 mm and 30 mm were used. Streamer current and emitted light signals were measured by using a 10 Ω current shunt and photomultiplier tube (PMT) respectively. The results indicated that initiation voltages of the synthetic ester liquid are slightly lower than those of the mineral oil for all the tip radii under both positive and negative polarities. Moreover, the synthetic ester liquid has lower breakdown voltages than the mineral oil for all the gap distance under both positive and negative polarities

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