scholarly journals Gas decomposition and electrode degradation characteristics of a 20% C 3 F 7 CN and 80% CO 2 gas mixture for high voltage accelerators

High Voltage ◽  
2021 ◽  
Author(s):  
Ibrahim Iddrissu ◽  
Qinghua Han ◽  
Lujia Chen ◽  
Louis Maksoud ◽  
Yannick Kieffel
Keyword(s):  
High Voltage ◽  
Gas Mixture ◽  
Electrode Degradation

New cw laser lines in a noble gas mixture high voltage hollow cathode discharge

1978 ◽  
Vol 68 (3-4) ◽  
pp. 317-318 ◽  
Author(s):  
M. Jánossy ◽  
K. Rózsa ◽  
L. Csillag ◽  
J. Bergou
Keyword(s):  
High Voltage ◽  
Hollow Cathode ◽  
Noble Gas ◽  
Hollow Cathode Discharge ◽  
Gas Mixture ◽  
Cw Laser

Study of DC circuit breaker of H2-N2 gas mixture for high voltage

2010 ◽  
Vol 174 (2) ◽  
pp. 9-17 ◽  
Author(s):  
Yuji Shiba ◽  
Yukinaga Morishita ◽  
Shuhei Kaneko ◽  
Shigemitsu Okabe ◽  
Hitoshi Mizoguchi ◽  
...  
Keyword(s):  
High Voltage ◽  
Circuit Breaker ◽  
Gas Mixture ◽  
Dc Circuit Breaker

scholarly journals Negative DC Breakdown Characteristics of C3F7CN / CO2 Gas Mixture for Application in High Voltage Accelerators

2021 ◽  
Vol 28 (3) ◽  
pp. 946-954
Author(s):  
Ibrahim Iddrissu ◽  
Lujia Chen ◽  
Faisal Omar Bahdad ◽  
John Dabin ◽  
Denis Joassin ◽  
...  
Keyword(s):  
High Voltage ◽  
Gas Mixture ◽  
Co2 Gas

scholarly journals Pressurized CF3I-CO2 Gas Mixture under Lightning Impulse and its Solid By-Products

2017 ◽  
Vol 7 (6) ◽  
pp. 3088 ◽  
Author(s):  
M. S. Kamarudin ◽  
A. Haddad ◽  
B. C. Kok ◽  
N. A. M. Jamail
Keyword(s):  
High Voltage ◽  
Laboratory Tests ◽  
Gas Mixtures ◽  
Gas Pressure ◽  
Gas Mixture ◽  
Electrode Gap ◽  
Co2 Gas ◽  
Lightning Impulse ◽  
Edx Analyses ◽  
By Products

<span>This paper describes tests results on the CF<sub>3</sub>I-CO<sub>2</sub> gas mixtures as an alternative for SF<sub>6</sub> gas as to be used as insulating medium in high voltage applications. Pressurized CF<sub>3</sub>I-CO<sub>2</sub> gas mixtures are subject under standard lightning impulse voltages at both positive and negative polarities</span><span>. Under rod-plane configuration, the electrode gap length and gas pressure are varied accordingly. Upon completion of the laboratory tests, SEM and EDX analyses are carried out to assess the solid by-products. It was found that higher gas mixtures provide better insulation strength. In terms of weight, 50% of the solid by-product is found to be iodine.</span>

scholarly journals Высоковольтная деградация электродов, обусловленная электрохимической инжекцией в жидких диэлектриках

2021 ◽  
Vol 57 (6) ◽  
pp. 36-49
Author(s):  
А. И. Жакин ◽  
◽  
А. Е. Кузько ◽  
Keyword(s):  
Polymer Film ◽  
High Voltage ◽  
Physical Adsorption ◽  
Experimental Studies ◽  
Electrochemical Reactions ◽  
Electrode Degradation ◽  
Kinetics Of Degradation ◽  
Kinetics Of

The results of experimental studies of the electrode degradation caused by electrochemical reactions under the action of high-voltage fields are presented. Under study were technical hydrocarbon and polymethylsiloxane (PMS) liquids, their solutions with iodine (I2) at chemically active (Cu) and indifferent (Ti) electrodes. It is shown that in hydrocarbons the Cu electrodes interact intensively with I2, and the cathodic degradation is more intense than the anodic one. The Ti electrodes do not degrade, but physical adsorption of I2 occurs on them in hydrocarbons, and a polymer film forms on them in PMS. The kinetics of degradation in time was studied.

scholarly journals Schlieren Images of Negative Streamer and Leader Formations in CO2 and a CF3I-CO2 Electronegative Gas Mixture

2020 ◽  
Vol 10 (22) ◽  
pp. 8006
Author(s):  
Phillip Widger ◽  
Meirion Hills ◽  
Daniel Mitchard
Keyword(s):  
High Voltage ◽  
Energy System ◽  
Gas Mixtures ◽  
Electron Collision ◽  
Electrical Network ◽  
Lightning Strike ◽  
Gas Mixture ◽  
Electrical Networks ◽  
Gas Density ◽  
Sustainable Energy System

In electrical networks, SF6 gas is currently used to insulate high-voltage equipment, however, due to its high environmental impact, new alternatives such as CO2 and electronegative gas mixtures such as CF3I-CO2 are being trialled to replace SF6 and create a sustainable energy system. A high-voltage lightning impulse (1.2 μs/50 μs) was used to approximate the disturbance in a high-voltage electrical network caused by a lightning strike and helped to identify the likely streamer and leader formations in different gases insulating a piece of gas insulated switchgear. In this paper, the theoretical and practical aspects of electrical streamer and leader formations in pure CO2 and an electronegative gas mixture of CF3I-CO2 are examined using schlieren videography in small length rod-plane gas gaps between 20 and 50 mm in length. Schlieren allows the examination of gas density in streamer formations and for the differences in weakly attaching gases, such as CO2, and electronegative gas mixtures, such as CF3I-CO2, to be studied. The gas pressure is varied in order to examine the differences in streamer and leader formation as the gas density is varied and hence the probability of electron collision is varied.

scholarly journals Analysis of Last Development Results for High Voltage Circuit-breakers Using New G3 Gas

2017 ◽  
Vol 4 (2) ◽  
pp. 157-160 ◽  
Author(s):  
P. Robin-Jouan ◽  
K. Bousoltane ◽  
Y. Kieffel ◽  
J. Y. Trepanier ◽  
R. Camarero ◽  
...  
Keyword(s):  
Global Warming ◽  
High Voltage ◽  
Global Warming Potential ◽  
Gas Mixture ◽  
Test Results ◽  
Chemical Behavior ◽  
Circuit Breakers ◽  
Simulation Tools ◽  
Environmental Friendly

Among many alternative gases proposed to replace SF6 as insulating gas, g<sup>3</sup> (green gas for grid), fluoronitril based component officially introduced at CIGRE 2014, can be now used for insulation projects and new environmental friendly circuit breakers. This gas mixture g<sup>3</sup>, presents a reduction of the global warming potential by 98% compared to SF<sub>6</sub> gas and shows quite good dielectric withstand capability. Many new investigations about thermal and chemical behavior have been done and are precised in this paper. Last switching test campaigns will be presented for 145 kV applications. Simulation tools should be updated to be applicable to these projects. Developments and comparisons with last test results will be analyzed.

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