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

Performance Evaluation of Insulators Using Flashover Voltage and Leakage Current

2013 ◽  
Vol 41 (2) ◽  
pp. 221-233 ◽  
Author(s):  
Mohammad Hamed Samimi ◽  
Amir Hossein Mostajabi ◽  
Iman Ahmadi-Joneidi ◽  
Amir Abbas Shayegani-Akmal ◽  
Hossein Mohseni
Keyword(s):  
Performance Evaluation ◽  
Leakage Current ◽  
Flashover Voltage

scholarly journals Effect of Ageing on the Tracking Characteristics of High-Temperature Vulcanized Silicone Rubber Hybrid Composites for High Voltage Insulation

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2242 ◽  
Author(s):  
Mohamed Ghouse Shaik ◽  
Vijayarekha Karuppaiyan
Keyword(s):  
Leakage Current ◽  
Silicone Rubber ◽  
Hybrid Composites ◽  
Electric Power System ◽  
Weight Percentage ◽  
Early Failures ◽  
High Voltage Insulation ◽  
Overall Performance ◽  
Current Characteristics ◽  
Structure Investigations

Micro-sized aluminum trihydrate (ATH) filled silicone rubber is useful as insulation in the electric power system. The addition of nanofillers can improve further, its overall performance. However, the degradation of such silicone insulator due to ageing has not yet been thoroughly analysed. Motivated by this, an investigation was done to observe the effect of ageing on the tracking, and the material characteristics of SiO2 nanofillers added micro-sized ATH-filled Silicone rubber. For this, the samples were prepared using different weight percentage of SiO2 nanofillers and were thermally-aged and water-aged in the laboratory environment. A well-regulated tracking-test setup was assembled, and the leakage current characteristics of the fresh, thermal-aged and water-aged samples were observed, as per international electro technical commission standard (IEC) 60,587. After tracking, the surface morphology of these samples was studied using scanning electron microscopy (SEM). Further, energy dispersive X-ray analysis (EDAX) was carried out to observe the elements present at the surface and, Fourier transform infra-red (FTIR) spectroscopy was conducted to study the changes in the chemical structure. Investigations through the leakage current, SEM, EDAX and FTIR revealed that the addition of nanofillers improved the tracking characteristics of the aged hybrid composite insulation samples, thereby minimising any early failures.

scholarly journals Effect of Filler Concentration on Tracking Resistance of ATH-Filled Silicone Rubber Nanocomposites

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2401 ◽  
Author(s):  
Youngtaek Jeon ◽  
Shin-Ki Hong ◽  
Myungchin Kim
Keyword(s):  
Leakage Current ◽  
Silicone Rubber ◽  
Thermo Gravimetric Analysis ◽  
Polymeric Materials ◽  
Filler Loading ◽  
Filler Concentration ◽  
Gravimetric Analysis ◽  
Surface Contact Angle ◽  
Current Characteristics ◽  
Surface Leakage

It is necessary for polymeric materials to have superior tracking resistance against various stress conditions for outdoor applications. In this study, the effect of nano-sized alumina tri-hydrate (ATH) particles on the tracking resistance of silicone rubber (SiR) is studied. Specimens with filler loadings of 1, 3, 5, 10, and 20 wt % are used for performance characterization. From the inclined plane test (IPT) results, apparent improvement in tracking resistance was achieved by mixing 3 wt % of nano-sized fillers, compared to unfilled specimens. ATH/SiR nanocomposites with 5 wt % loading showed comparable tracking performance to SiO2/SiR microcomposites with 20 wt % loading. For detailed analysis, measurements of surface contact angle (SCA) and surface leakage current, and thermo-gravimetric analysis (TGA) were performed. As the nano-ATH filler concentration increased, both thermal stability and leakage current characteristics were improved. Such results agreed with the tracking resistance performance by showing that thermal decomposition and surface charge transport is inhibited in ATH/SiR nanocomposites. Furthermore, performance improvement in nanocomposites was achieved, even at low filler loadings, compared to microcomposites. Meanwhile, the change in SCA was found to be rather limited, regardless of filler loading and filler size.

scholarly journals Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2440
Author(s):  
Xiangxin Li ◽  
Ming Zhou ◽  
Yazhou Luo ◽  
Gang Wang ◽  
Lin Jia
Keyword(s):  
Leakage Current ◽  
Discharge Characteristics ◽  
Fundamental Component ◽  
Ceramic Insulator ◽  
Flashover Voltage ◽  
Arc Shape ◽  
Surface Discharges ◽  
Ieee Standard ◽  
Ice Shedding ◽  
Indeterminate Variation

Considering the ice shedding phenomena on ice-covered outdoor insulators, this paper conducted the artificial experiments by using a five-unit suspension ceramic insulator string covered with wet-grown ice to investigate the effects of ice shedding on the icing discharge characteristics. According to IEEE Standard 1783/2009, the minimum flashover voltage (VMF), propagation of discharges to flashover and related leakage current (LC) were measured. It was found that VMF after ice shedding can be increased by about 17% as compared with that before ice shedding. The initiation and formation of discharge arcs across ice-free regions caused by ice shedding become difficult, showing an unstable propagating path, indeterminate arc shape and longer arc column. Although VMF under ice shedding conditions is higher than that without ice shedding, the fundamental component, and harmonics show lower amplitudes for the latter case. The ratios of harmonics to the fundamental are well in accordance with discharge characteristics during the flashover for which the ratios show a relatively stable varying tendency in the absence of ice shedding, but show changeable and indeterminate variation under ice shedding conditions. The obtained results are helpful to understand the icing state and its influence on surface discharges for preventing the icing flashovers.

Leakage current monitoring and outdoor degradation of silicone rubber

2001 ◽  
Vol 8 (6) ◽  
pp. 1108-1115 ◽  
Author(s):  
Jeong-Ho Kim ◽  
Woo-Chang Song ◽  
Jae-Hyung Lee ◽  
Yong-Kwan Park ◽  
Han-Goo Cho ◽  
...  
Keyword(s):  
Leakage Current ◽  
Silicone Rubber ◽  
Current Monitoring

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.

Sign in / Sign up

Export Citation Format

Share Document