Investigation on Leakage Current of Silicone Rubber Insulator in Salt-fog Chamber

This paper presents the results of a study carried out to examine electrical characteristics of high voltage Silicone Rubber (SIR) insulators under weather pollution conditions. The specimens of SIR with and without Alumina tri-hydrate (ATH) filler have been chemically prepared. The AC (50 Hz) surface aging of SIR specimens have been evaluated under salt fog chamber. Furthermore, the relationship between the leakage current and time to failure for SIR specimens with various concentrations of ATH filler under different weather pollution conditions has been measured in this work.

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Discussion on discharge mechanism based on leakage current measurements of outdoor polymeric insulating materials in salt-fog test

Annual Report Conference on Electrical Insulation and Dielectric Phenomena ◽

10.1109/ceidp.2002.1048813 ◽

2003 ◽

Cited By ~ 1

Author(s):

M. Hikita ◽

M. Miyata ◽

S. Kurihara ◽

S. Ohtsuka ◽

Y. Hashimoto ◽

...

Keyword(s):

Leakage Current ◽

Insulating Materials ◽

Discharge Mechanism ◽

Salt Fog

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

Materials ◽

10.3390/ma13102242 ◽

2020 ◽

Vol 13 (10) ◽

pp. 2242 ◽

Cited By ~ 1

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.

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

Energies ◽

10.3390/en12122401 ◽

2019 ◽

Vol 12 (12) ◽

pp. 2401 ◽

Cited By ~ 5

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.

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