scholarly journals Effect of mineral oil on flashover voltage of HTV silicone rubber under AC corona ageing: from the view of trap level distribution

2020 ◽  
Vol 14 (23) ◽  
pp. 5498-5504
Author(s):  
Yu Yu ◽  
Ke Wang ◽  
Yan Yang ◽  
Gang Li ◽  
Guangning Wu ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Mineral Oil ◽  
Trap Level ◽  
Flashover Voltage

scholarly journals Influence of Silicone Rubber Coating on the Characteristics of Surface Streamer Discharge

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3784
Author(s):  
Xiaobo Meng ◽  
Liming Wang ◽  
Hongwei Mei ◽  
Chuyan Zhang
Keyword(s):  
Silicone Rubber ◽  
Electrical Power ◽  
Electrical Power System ◽  
Streamer Discharge ◽  
Reliable Operation ◽  
Pollution Flashover ◽  
Flashover Voltage ◽  
Streamer Propagation ◽  
Rubber Coating ◽  
Rubber Coatings

A pollution flashover along an insulation surface—a catastrophic accident in electrical power system—threatens the safe and reliable operation of a power grid. Silicone rubber coatings are applied to the surfaces of other insulation materials in order to improve the pollution flashover voltage of the insulation structure. It is generally believed that the hydrophobicity of the silicone rubber coating is key to blocking the physical process of pollution flashover, which prevents the formation of continuously wet pollution areas. However, it is unclear whether silicone rubber coating can suppress the generation of pre-discharges such as corona discharge and streamer discharge. In this research, the influence of silicone rubber coating on the characteristics of surface streamer discharge was researched in-depth. The streamer ‘stability’ propagation fields of the polymer are lower than that of the polymer with silicone rubber coating. The velocities of the streamer propagation along the polymer are higher than those along the polymer with silicone rubber coating. This indicates that the surface properties of the polymer with the silicone rubber coating are less favorable for streamer propagation than those of the polymer.

scholarly journals Compatibility Study of Silicone Rubber and Mineral Oil

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5899
Author(s):  
Smitha Karambar ◽  
Stefan Tenbohlen
Keyword(s):  
Dielectric Properties ◽  
Moisture Content ◽  
Silicone Rubber ◽  
Mineral Oil ◽  
Acid Number ◽  
Compatibility Study ◽  
Total Acid ◽  
Silicone Rubbers ◽  
Conductive Silicone Rubber ◽  
Solid Insulation

In this study, three types of silicone rubbers, namely, insulative silicone rubber, conductive silicone rubber and silicone rubber with conductive as well as insulative layers are investigated for their compatibility with mineral oil. Mineral oil with different silicone rubber samples is thermally aged at 130 °C for 360 h, 720 h and 1080 h and at 23 °C, 98 °C and 130 °C for 360 h. At the end of each ageing interval, mineral oil and oil-impregnated silicone rubbers are investigated for their dielectric properties. Aged mineral oil samples are investigated for their moisture content, breakdown voltage, colour number, dissolved gases and total acid number, whereas solid insulation samples are investigated for their moisture content. Additionally, pressboard samples in mineral oil and mineral oil without any solid insulation materials are also aged under the same conditions and are investigated for their dielectric properties. From the obtained results, it can be assessed that the presence of carbon particles in conductive silicone rubber negatively impacts the dielectric properties of mineral oil. Among the investigated silicone rubbers, the insulative silicone rubber exhibits good compatibility with mineral oil and a strong potential for being used in mineral oil.

scholarly journals Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 324 ◽  
Author(s):  
Zhijin Zhang ◽  
Tian Liang ◽  
Chen Li ◽  
Xingliang Jiang ◽  
Jian Wu ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Electrical Strength ◽  
Dielectric Parameter ◽  
Material Degradation ◽  
Performance Loss ◽  
Static Contact ◽  
Rubber Composite ◽  
Flashover Voltage ◽  
Insulation Performance ◽  
Salt Fog

In recent years, the performances of rubber composite insulators, which operate in the coastal foggy regions, have attracted researchers’ concern because of the observation of their degradation. In this paper, salt-fog experiments with DC test voltage of high-temperature vulcanized (HTV) silicone rubber (SR) have been conducted. The electrical strength and material performances of samples with salt-fog treatment were focused on. The DC flashover voltage, hydrophobicity, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and dielectric parameter were investigated. It was found that the samples’ performances deteriorated after salt-fog treatment. The DC flashover voltage of HTV SR decreased in the salt-fog environment. The hydrophobicity of the material deteriorated and the static contact angle (CA) became small. Under the action of electric and thermal stress, the surface of samples after salt-fog treatment became rough and porous. The absorption peak of the hydrophobic groups decreased, indicating that the molecular chain of SR material was broken, and the filler was consumed, bringing down the arc resistance of the sample. The absorption of moisture further led to insulation performance loss and then reduced the electrical strength of the material. Degradation of physicochemical properties will eventually lead to a decline in electrical strength.

Aging evaluation of silicone rubber insulators using leakage current and flashover voltage analysis

2013 ◽  
Vol 20 (1) ◽  
pp. 212-220 ◽  
Author(s):  
I. Ahmadi-Joneidi ◽  
A. Majzoobi ◽  
A.A. Shayegani-akmal ◽  
H. Mohseni ◽  
J. Jadidian
Keyword(s):  
Leakage Current ◽  
Silicone Rubber ◽  
Flashover Voltage

Preparation and Performance of RTV Coating for Anti-Pollution Flashover with Superhydrophobicity by Filling CaCO3/SiO2 Composite Particles into Silicone Rubber

2011 ◽  
Vol 328-330 ◽  
pp. 1263-1267 ◽  
Author(s):  
Jing Hai ◽  
Jin Xin Yang ◽  
Jiang Cheng ◽  
Zhuo Ru Yang
Keyword(s):  
Silicone Rubber ◽  
Spray Coating ◽  
Composite Particles ◽  
Coating Film ◽  
Water Contact ◽  
Pollution Flashover ◽  
Flashover Voltage ◽  
Strong Adhesion ◽  
Rubber Coating ◽  
And Performance

Room temperature vulcanizing (RTV) silicone rubber coating with superhydrophobicity for anti-pollution flashover is prepared by filling silica-encapsulated calcium carbonate particles (CaCO3/SiO2 composite particles) into polydimethylsiloxane (PDMS) rubber. Two-step spraying technology is applied for fabricating the superhydrophobic RTV coating film on outdoor insulators. The primary spray coating provides basically the strong adhesion and certain hydrophobicity, and the second one produces the appropriate roughness structure and further enhances the superhydrophobicity. The water contact angle on the prepared RTV coating film is 165°and the sliding (rolling) angle of water droplet is about 5°, allowing water droplets to move easily on the coating surface and give self-cleaning function of the RTV coated insulator surface. The flashover voltage of insulators with superhydrophobic RTV coating is 29.95 kV, quite higher than that of insulators with common RTV coating (23.29) and that without RTV coating (11.34 kV).

scholarly journals Influence of Single and Multiple Dry Bands on Critical Flashover Voltage of Silicone Rubber Outdoor Insulators: Simulation and Experimental Study

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1335 ◽  
Author(s):  
Arshad ◽  
Muhammad Mughal ◽  
Azam Nekahi ◽  
Mansoor Khan ◽  
Farhana Umer
Keyword(s):  
Experimental Study ◽  
Silicone Rubber ◽  
Flashover Voltage ◽  
Outdoor Insulators ◽  
Dry Bands
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