scholarly journals Energy Distribution of Optical Radiation Emitted by Electrical Discharges in Insulating Liquids

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2172 ◽  
Author(s):  
Michał Kozioł
Keyword(s):  
Energy Distribution ◽  
Optical Radiation ◽  
Electric Discharges ◽  
Diagnostic Systems ◽  
Electrical Discharges ◽  
Insulating Liquids ◽  
Protection Systems ◽  
Surface Discharges ◽  
Optical Spectrophotometry ◽  
Natural Ester

This article presents the results of the analysis of energy distribution of optical radiation emitted by electrical discharges in insulating liquids, such as synthetic ester, natural ester, and mineral oil. The measurements of optical radiation were carried out on a system of needle–needle type electrodes and on a system for surface discharges, which were immersed in brand new insulating liquids. Optical radiation was recorded using optical spectrophotometry method. On the basis of the obtained results, potential possibilities of using the analysis of the energy distribution of optical radiation as an additional descriptor for the recognition of individual sources of electric discharges were indicated. The results can also be used in the design of various types of detectors, as well as high-voltage diagnostic systems and arc protection systems.

scholarly journals Effect of electrical discharge on the properties of natural esters insulating fluids

2021 ◽  
Vol 23 (3) ◽  
pp. 1281
Author(s):  
Imran Sutan Chairul ◽  
Sharin Ab Ghani ◽  
Nur Hakimah Ab Aziz ◽  
Mohd Shahril Ahmad Khiar ◽  
Muhammad Syahrani Johal ◽  
...  
Keyword(s):  
Water Content ◽  
Breakdown Voltage ◽  
Electrical Discharge ◽  
Mineral Oil ◽  
Electrical Discharges ◽  
Inhomogeneous Electric Field ◽  
Sustainable Resources ◽  
Low Viscosity ◽  
Environmental Friendly ◽  
Natural Ester

<p>Vegetable oils have been an alternative to mineral oil for oil-immersed transformers due to concern on less flammable, environmental-friendly, biodegradable, and sustainable resources of petroleum-based insulating oil. This paper presents the effect of electrical discharges (200 up to 1000 discharges) under 50 Hz inhomogeneous electric field on the properties (acidity, water content, and breakdown voltage) of two varieties of vegetable based insulating oils; i) natural ester (NE) and ii) low viscosity insulating fluids derived from a natural ester (NE<sub>LV</sub>). Results show the water content, acidity and breakdown voltage of NE fluctuate due to applied discharges, while NE<sub>LV</sub> display insignificant changes. Hence, results indicate that the low viscosity insulating fluids derived from natural ester tend to maintain their properties compared to natural ester.</p>

scholarly journals Radiation in the Optical and UHF Range Emitted by Partial Discharges

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4334 ◽  
Author(s):  
Michał Kozioł ◽  
Łukasz Nagi ◽  
Michał Kunicki ◽  
Ireneusz Urbaniec
Keyword(s):  
Electromagnetic Waves ◽  
Electrical Power ◽  
Partial Discharges ◽  
Radio Waves ◽  
Insulation Systems ◽  
Surface Discharges ◽  
High Voltage Insulation ◽  
Solid Dielectrics ◽  
Electrode Systems ◽  
Optical Spectrophotometry

This paper presents the results of analysis of a solid dielectric’s influence on the phenomena associated with the signals emitted by surface partial discharges. Three types of electrode systems were tested, in which solid dielectrics made of pressboard, Teflon, and glass were used. The emission of such signals as radio waves in the Ultra high frequency (UHF) range and optical radiation was analyzed. The measurements were carried out in the insulation systems most commonly used in electrical power equipment, i.e., mineral oil and air. UHF and optical spectrophotometry methods were used to register the emitted signals. The obtained results indicate that the type of material from which the dielectric solid is made may have a potential impact on some ranges of emitted electromagnetic waves during the surface electrical discharges. The research topic undertaken is important in issues associated with high-voltage insulation systems and in particular with surface discharges, which are often the cause of their damage.

The Phenomenology of Electric Discharges Generated between a Negatively Charged Water Aerosol Cloud and Earth

Vestnik MEI ◽  
2020 ◽  
Vol 6 (6) ◽  
pp. 53-59
Author(s):  
Nikolay Yu. Lysov ◽  
◽  
Aleksandr V. Orlov ◽  
Aleksandr G. Temnikov ◽  
Leonid L. Chernensky ◽  
...  
Keyword(s):  
Electric Field ◽  
Optical Sensors ◽  
Negative Polarity ◽  
Measuring Instruments ◽  
Experimental Setup ◽  
Electric Discharges ◽  
Electrical Discharges ◽  
Aerosol Cloud ◽  
The Earth ◽  
Charged Aerosol

Studies of electrical discharges generated in the electric field of charged aerosol clouds make it possible to obtain better understanding of how lightning occurs in thunderclouds. For this purpose, an experimental setup was developed, which allows charged aerosol clouds of negative polarity to be produced. A charged aerosol cloud creates electric field strength sufficient to generate electrical discharges between this cloud and the earth. The experimental setup for obtaining an artificially produced charged aerosol cloud is briefly described. The experimental setup is equipped with a set of measuring instruments for recording the electrical and optical signals of discharges and for photographing the discharges themselves. A database has been accumulated in the course of experiments, which includes the waveforms of discharge current pulses recorded using digital oscilloscopes, the waveforms of signals from optical sensors recording the development of discharges in space and time, and the snapshots of discharges. By using the accumulated information it is possible to classify discharges that occur between artificially produced charged aerosol clouds of negative polarity and the earth by type and parameters. An analysis of the experimental data has shown that both upward and downward discharges can occur between a charged aerosol cloud and the earth, which is typical for natural lightning phenomena. The snapshots of the most characteristic types of electric discharges observed in experiments and simple models explaining the development of these discharges are studied.

I. On the sensitive state of electrical discharges through rarefied gases

1879 ◽  
Vol 29 (196-199) ◽  
pp. 21-24
Keyword(s):  
Induction Coil ◽  
Electric Discharges ◽  
Rarefied Gases ◽  
Electrical Discharges ◽  
Vacuum Tubes ◽  
Special Examination ◽  
Constant Source

It has frequently been remarked that the luminous column produced by electric discharges in vacuum tubes sometimes displays great sensitiveness on the approach of the finger, or other conductor, to the tube. This is notably the case when with an induction coil a very rapid break is used, or when with any constant source of electricity an air-spark is interposed in the circuit leading to the tube. The striking character of the phenomena, and the opportunity which they showed for affecting the discharge from the outside during its passage, led the authors of this paper to consider that a special examination of this sensitive state would be desirable.

scholarly journals Application of Optical Spectrophotometry for Analysis of Radiation Spectrum Emitted by Electric Arc in the Air

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Michał Kozioł ◽  
Daria Wotzka ◽  
Tomasz Boczar ◽  
Paweł Frącz
Keyword(s):  
Optical Radiation ◽  
Radiation Spectrum ◽  
Electric Arc ◽  
Structural Defects ◽  
Constant Voltage ◽  
Copper Electrodes ◽  
Measurement And Analysis ◽  
Low Energies ◽  
Optical Spectrophotometry

This paper presents the results of measurement and analysis of optical radiation emitted by a free burning electric arc. The aim was to determine the application possibilities of optical spectrophotometry for detection of electric arcs. The research works considered electric arc generated with a constant voltage supply between two copper electrodes in the air, carried out under laboratory conditions. A high resolution optical spectrophotometer was used for registration of optical radiation. The analyses involved determination of two dimensionless descriptors obtained for the gathered spectra. Moreover, for each of the registered intensity distributions, the energy values were calculated for three frequency ranges. Based on the measured signals, the possibility of application of spectrophotometry for the optical radiation analysis was confirmed. The analysis indicated that the most energy of optical radiation is detected for the range of 200–780 nm, while above 780 nm almost no optical energy is emitted. Spectrophotometric studies performed in the UV-NIR range are of interest since one can obtain information about the structural defects (at lower wavebands) or impurities and/or point defects (at low energies bands). It was also stated that the obtained descriptors may be applied for diagnosis and identification of electric arc purposes.

Modeling of optical radiation energy distribution in plant tissue

2009 ◽  
Vol 107 (6) ◽  
pp. 903-908 ◽  
Author(s):  
V. P. Zakharov ◽  
I. A. Bratchenko ◽  
A. R. Sindyaeva ◽  
E. V. Timchenko
Keyword(s):  
Energy Distribution ◽  
Plant Tissue ◽  
Optical Radiation ◽  
Radiation Energy

scholarly journals Analysis of Optical Radiation Generated by Electrical Discharges on Support Insulator

2013 ◽  
Vol 124 (3) ◽  
pp. 413-416 ◽  
Author(s):  
P. Frącz ◽  
T. Boczar ◽  
D. Zmarzły ◽  
T. Szczyrba
Keyword(s):  
Optical Radiation ◽  
Electrical Discharges ◽  
Support Insulator
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