scholarly journals A SiPM-Based Trinal Spectral Sensor Developed for Detecting Hazardous Discharges in High-Voltage Switchgear

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Xiaobing Yu ◽  
Chen Shen ◽  
Yan Jing ◽  
Ming Ren ◽  
Haitao Wu ◽  
...  
Keyword(s):  
High Voltage ◽  
Risk Evaluation ◽  
Arc Discharge ◽  
Spectral Ratio ◽  
Electric Discharges ◽  
High Confidence ◽  
Spectral Bands ◽  
Regular Change ◽  
Discharge Monitoring ◽  
Hazard Rating

Electric discharges seriously threat the safety of high-voltage switchgear. In this paper, a spectrum-based optical method is proposed for hazardous discharge monitoring. A SiPM-based trinal spectral sensor is developed with good performances in terms of sensitivity, defect resolution, and risk evaluation. Experiments carried out on two types of artificial discharges (i.e., partial discharge and arc discharge) demonstrate that the light intensities coupled in the three spectral bands account for different proportions and the ratio among the three components generally experiences a regular change with increase in severity of discharge. The typical spectral ratio values are then acquired for hazard rating of discharge and recognition of discharge types with high confidence.

Production of Silver Nanoparticles Using High Voltage Arc Discharge Method

2016 ◽  
Vol 12 (6) ◽  
pp. 747-753 ◽  
Author(s):  
Marek J. Kasprowicz ◽  
Anna Gorczyca ◽  
Piotr Janas
Keyword(s):  
Silver Nanoparticles ◽  
High Voltage ◽  
Arc Discharge ◽  
Discharge Method

scholarly journals Вольт-амперные характеристики начальной стадии дугового разряда в высоковольтном вакуумном диоде

2019 ◽  
Vol 45 (12) ◽  
pp. 33
Author(s):  
С.Г. Давыдов ◽  
А.Н. Долгов ◽  
А.В. Корнеев ◽  
Р.Х. Якубов
Keyword(s):  
Electron Beam ◽  
High Voltage ◽  
Arc Discharge ◽  
Ion Beam ◽  
Vacuum Diode ◽  
Vacuum Arc ◽  
Ion Acceleration ◽  
Plasma Cloud ◽  
Initial Stage ◽  
Instability Development

AbstractThe process of electron instability development and propagation of a cathode electron beam and anomalous ion beam, followed by outburst of current in the initial stage of arc discharge was observed in rarefied plasma cloud of high-voltage vacuum diode. These events are consistent with the model of anomalous ion acceleration in interelectrode plasma at the spark stage of vacuum arc discharge.

Basic Study on Pressure Vessel for Food Processing by Shock Loading

2006 ◽  
Author(s):  
Asuka Oda ◽  
Toshiaki Watanabe ◽  
Shigeru Itoh
Keyword(s):  
High Pressure ◽  
High Voltage ◽  
Food Processing ◽  
Shock Loading ◽  
Electric Discharges ◽  
Water Tank ◽  
Basic Study ◽  
Duration Of Action ◽  
Japanese Radish ◽  
Processing Device

Underwater shockwave is easily generated by means of explosion of explosive and by means of high voltage electric discharges in water. It has characteristics of high pressure, very short duration of action, and permeation [1]. Therefore, underwater shockwave can destroy only materials inside without destroying their outside. We tried using application of underwater shockwave to some foods as food processing device. At this experiment, foods were applied underwater shockwave by using detonating fuse and electric detonator in water tank. Foods sample was apples, Japanese radishes, and burdocks. In the result, foods were made soft. From result of apples, we easily got juice by squeezing by woman’s power without grating up apples. And there was difference of content of polyphenols in juice between application underwater shockwave to apples and non-application. Extraction of Japanese radish was improved. From these experimental results, we suggest necessity spec of shockwave processing vessel for food processing.

scholarly journals Identification of Acoustic Signals of Internal Electric Discharges on Glass Insulator under Variable Applied Voltage

2016 ◽  
Vol 6 (2) ◽  
pp. 827
Author(s):  
Nasir A. Al-geelani ◽  
M. Afendi M. Piah ◽  
Ibrahim Saeh ◽  
Nordiana Azlin Othman ◽  
Fatin Liyana Muhamedin ◽  
...  
Keyword(s):  
High Voltage ◽  
Acoustic Emissions ◽  
Digital Processing ◽  
Electrical Equipment ◽  
Electric Discharges ◽  
Voltage Transformer ◽  
Different Types ◽  
High Voltage Transformer ◽  
Glass Insulator ◽  
The Time Domain

<p>A Partial Discharge (PD) is an unwanted phenomenon in electrical equipment. Therefore it is of great importance to identify different types of PD and assess their severity. This paper investigates the acoustic emissions associated with Internal Discharge (ID) from different types of sources in the time-domain. An experimental setup was arranged in the high voltage laboratory, a chamber with an electrode configuration attached to it was connected to a high voltage transformer for generating various types of PD. A laboratory experiment was done by making the models of these discharges. The test equipment including antennas as a means of detection and digital processing techniques for signal analysis were used. Wavelet signal processing was used to recover the internal discharge acoustic signal by eliminating the noises of many natures.</p>

Identification of Acoustic Signals of Internal Electric Discharges on Glass Insulator under Variable Applied Voltage

2016 ◽  
Vol 6 (2) ◽  
pp. 827 ◽  
Author(s):  
Nasir A. Al-geelani ◽  
M. Afendi M. Piah ◽  
Ibrahim Saeh ◽  
Nordiana Azlin Othman ◽  
Fatin Liyana Muhamedin ◽  
...  
Keyword(s):  
High Voltage ◽  
Acoustic Emissions ◽  
Digital Processing ◽  
Electrical Equipment ◽  
Electric Discharges ◽  
Voltage Transformer ◽  
Different Types ◽  
High Voltage Transformer ◽  
Glass Insulator ◽  
The Time Domain

<p>A Partial Discharge (PD) is an unwanted phenomenon in electrical equipment. Therefore it is of great importance to identify different types of PD and assess their severity. This paper investigates the acoustic emissions associated with Internal Discharge (ID) from different types of sources in the time-domain. An experimental setup was arranged in the high voltage laboratory, a chamber with an electrode configuration attached to it was connected to a high voltage transformer for generating various types of PD. A laboratory experiment was done by making the models of these discharges. The test equipment including antennas as a means of detection and digital processing techniques for signal analysis were used. Wavelet signal processing was used to recover the internal discharge acoustic signal by eliminating the noises of many natures.</p>

The effect of silver nanoparticles on phytopathogenic spores of Fusarium culmorum

2010 ◽  
Vol 56 (3) ◽  
pp. 247-253 ◽  
Author(s):  
Marek Jan Kasprowicz ◽  
Magdalena Kozioł ◽  
Anna Gorczyca
Keyword(s):  
Silver Nanoparticles ◽  
High Voltage ◽  
Incubation Time ◽  
Mycelial Growth ◽  
Arc Discharge ◽  
Fusarium Culmorum ◽  
Potato Dextrose Agar ◽  
Sprout Length ◽  
Discharge Method ◽  
Control Samples

The aim of the present experiment was to investigate the influence of silver nanoparticles on Fusarium culmorum (W.G. Smith) Sacc. (FC) spores. The silver nanoparticles were produced by the high-voltage arc discharge method. To test the effect of silver nanoparticles on FC spores, 3 parameters were tested. One of these parameters was the vegetative mycelial growth in 2 experiments. The first involved the growth of FC spores on potato dextrose agar (PDA) medium after contact with 0.12–10 ppm of silver nanoparticles, and the second the growth of spores after contact with 0.12–2.5 ppm solutions of silver, but with culturing on 3 types of media (PDA, nutrient-poor PDA, and agar) instead. The next parameter was the formation of spores after the mycelia were cultured. The last parameter was spore germination in a 2.5 ppm solution of silver nanoparticles. A significant reduction in mycelial growth was observed for spores incubated with silver nanoparticles. This relationship was dependent on the incubation time and type of growth medium, but did not depend significantly on the concentration of silver nanoparticles up to 2.5 ppm. The sporulation test showed that, relative to control samples, the number of spores formed by mycelia increased in the culture after contact with silver nanoparticles, especially on the nutrient-poor PDA medium. The 24 h incubation of FC spores with a 2.5 ppm solution of silver nanoparticles greatly reduced the number of germinating fragments and sprout length relative to the control.

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