Comparison of Decomposition By-products of C4F7N/CO2 Mixed Gas under AC Discharge Breakdown and Partial Discharge

2019 ◽  
Author(s):  
Yongyan Zhou ◽  
Chenwei Li ◽  
Nian Tang ◽  
Boya Zhang ◽  
Li Li ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Mixed Gas ◽  
Ac Discharge ◽  
By Products

Experimental investigation of AC discharge cleaning with mixed gas in a HL-1 torus

1990 ◽  
Vol 176-177 ◽  
pp. 645-653 ◽  
Author(s):  
Yao Lianghua ◽  
Sun Shouqi ◽  
Yan Donghai ◽  
Xu Deiming ◽  
Zhang Hongying ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Mixed Gas ◽  
Ac Discharge

scholarly journals Study on Partial Discharge Characteristics of C6F12O Mixed Gas

2021 ◽  
Author(s):  
Xiajin Rao ◽  
Dajian Li ◽  
Xiaofei Xia ◽  
Yi Su ◽  
Yufeng Lu ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Low Voltage ◽  
Partial Discharge ◽  
Buffer Gas ◽  
Mixing Ratio ◽  
Mixed Gas ◽  
Discharge Characteristics ◽  
Power Frequency ◽  
The Difference ◽  
Inception Voltage

Abstract The greenhouse effect of SF6 increasingly limits its application in various gas insulated equipment. C6F12O combines the advantages of insulation resistance, safety and environmental protection. When mixed with buffer gas, C6F12O is considered to have potential application prospects in medium and low voltage equipment. In this paper, about the partial discharge characteristics of the mixed gas, an experimental study was carried out. The partial discharge initiation voltage and discharge extinction voltage of mixed gas under power frequency voltage are measured and compared with the breakdown voltage. The results show that with the increase of mixing ratio, the partial discharge initiation voltage and extinction voltage of mixed gas gradually increase, and the effect of gas pressure on high mixing ratio is obvious. The difference between the partial discharge inception voltage and the breakdown voltage is larger than that of pure N2. The research in this paper can provide an important reference for the application, operation and protection of C6F12O mixed gas in medium and low voltage equipment.

Gas by-products of CF3I under AC partial discharge

2011 ◽  
Vol 69 (6) ◽  
pp. 611-617 ◽  
Author(s):  
Mohamad Kamarol Mohd Jamil ◽  
Shinya Ohtsuka ◽  
Masayuki Hikita ◽  
Hitoshi Saitoh ◽  
Masayuki Sakaki
Keyword(s):  
Partial Discharge ◽  
By Products

scholarly journals Partial discharge characteristics of C6F12O/CO2 mixed gas at power frequency AC voltage

AIP Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 095057 ◽  
Author(s):  
Shuangshuang Tian ◽  
Xiaoxing Zhang ◽  
Yang Wang ◽  
Xiajin Rao ◽  
Fanchao Ye ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Mixed Gas ◽  
Discharge Characteristics ◽  
Power Frequency

scholarly journals Research on the Key Technology of Medium Voltage Environmental Protection Metal-enclosed Switchgear

2020 ◽  
Vol 185 ◽  
pp. 04031
Author(s):  
WANG Ning ◽  
XING Lin ◽  
WU Peng ◽  
WANG Suo ◽  
HU Yuan
Keyword(s):  
Partial Discharge ◽  
Environmentally Friendly ◽  
Ring Network ◽  
Mixed Gas ◽  
Development Trends ◽  
Key Technology ◽  
Medium Voltage ◽  
Development Status ◽  
Environmental Adaptability ◽  
The Cost

This article introduces environmentally-friendly metal-enclosed switchgear, and comprehensively summarizes the development status, technical characteristics, technical difficulties and development trends of solid-insulated ring network cabinets and environmentally-friendly gas-insulated switch cabinets. The development status of solid insulated ring network cabinets and environmentallyfriendly gas insulated switch cabinets are reviewed, and their technical characteristics are summarized in terms of volume, structure, maintainability, safety and environmental adaptability. Focus on the analysis and study of the technical difficulties of solid insulated ring network cabinets and environmentally friendly gas insulated switch cabinets, and pointed out the partial discharge control of the surface of the insulating parts, the strengthening of the sealing, the cost control, the recycling and utilization of epoxy resin, the optimization of insulation, and the breaking capacity. The guarantee of the quality, the selection and recovery of mixed gas are their future development trends. It provides a useful reference for the development and improvement of environmentally-friendly metal-enclosed switchgear.

Classification of Partial Discharge Sources by SF6 Decomposition By-Products

2021 ◽  
Author(s):  
Ammar Salah Mahdi ◽  
Zulkurnain Abdul-Malek ◽  
Amirreza Naderipour ◽  
Sanuri Ishak ◽  
Mohd Nur Khaidir Bin Hussein
Keyword(s):  
Partial Discharge ◽  
Sf6 Decomposition ◽  
By Products

scholarly journals Time Development of Voltage Frequency Dependence of Partial Discharge Activity in Voids

2019 ◽  
pp. 139-144 ◽  
Author(s):  
Torstein Grav Aakre ◽  
Erling Ildstad ◽  
Sverre Hvidsten
Keyword(s):  
Partial Discharge ◽  
Discharge Activity ◽  
Glass Fiber Reinforced ◽  
Conditioning Period ◽  
Voltage Application ◽  
Voltage Frequency ◽  
Frequency Sweeps ◽  
The One ◽  
By Products ◽  
Test Objects

Condition assessment of high voltage equipment based on partial discharge measurements is often performed after a voltage pre-conditioning period. The aim of this paper is to present results from experimental examinations of time variance of partial discharge activity and to propose physical explanations of the phenomena observed. Experiments were performed on laboratory made 3 mm thick discs of generator bar insulation, consisting of mica and glass fiber reinforced epoxy with a 0.5 mm thick cylindrical void surfaces of 10 mm in diameter. The effect of conducting and insulating void surfaces was examined using copper tape as upper and lower electrodes of the voids. All objects were tested by 12 one-minute long AC voltage frequency sweeps at frequencies from 50 Hz to 0.1 Hz distributed in time from start of the experiment, after initial one-hour constant 50 Hz voltage application and during object short-circuiting for 20 h. The main result shows that in case of insulating voids the apparent charges vanished after the one-hour constant 50 Hz voltage application. After a grounding period of 5 minutes, the charge magnitudes slowly increased with time until reaching steady state after about 4-8 hours. Test objects with conductive void surfaces showed such reduction in case of PD testing at 0.1 Hz only. At voltage frequencies above 10 Hz the measured PD magnitudes were found to be nearly constant, close to the expected high theoretical value. This indicate that PD by-products strongly affected the void resistivity and thereby affect the PD activity of insulating voids. These by-products are temporary and disappear with time.

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