Moisture absorption, desorption, and moisture-induced electrical performances of high-temperature vulcanized silicone rubber

Wang, Z.; Jia, Zhidong; Fang, Maohuan; Li, Y. S.; Guan, Zhicheng

doi:10.1109/tdei.2015.005452

Cited by 33 publications

(14 citation statements)

References 20 publications

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“…Figure 5 presents the DC volume resistivity and AC breakdown strength at 50 Hz of SiR during silicone grease absorption. The breakdown strength is calculated using Weibull distribution [13,14]. As shown, the volume resistivity generally decreases, and the breakdown strength overall initially increases and then decreases during the absorption process.…”

Section: Diffusion Mechanismmentioning

confidence: 97%

Property Failure of Silicone Rubber Caused by Silicone Grease Absorption

Zhong

Qiu

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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This study focuses on the absorption characteristics and evolution of key properties of silicone rubber (SiR) in the presence of silicone grease; a typical material used in power cable accessories. Diffusion mechanism of silicone grease within the SiR is investigated and the results indicate that it follows Langmuir diffusion model in the absence of significant swelling. Silicone grease absorption behavior is also explored under tensile strain and at various temperatures. The tensile strain accelerates and increases the absorption of silicone grease. In addition, the influence of the absorbed silicone grease on the key electrical and mechanical properties of SiR is surveyed. The investigation shows that the properties deteriorate. In addition, the mechanism of the mechanical property deterioration of SiR is discussed.

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Section: Diffusion Mechanismmentioning

confidence: 97%

Property Failure of Silicone Rubber Caused by Silicone Grease Absorption

Zhong

Qiu

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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“…The chemical degradation would generate the mobility of the ions of the dipole, and the degree of the dipole orientation would be intensive. This was because the moisture was a reaction with the combination of the epoxy, glass and mica materials, which affected the interfacial polarization at the interface barrier within the insulation [12][13][14][15][16][17][18][19].…”

Section: Resultsmentioning

confidence: 99%

The Investigation of Insulation Performance Evaluation of the Large Electrical Rotating Machine in Frequency Domain

Phloymuk

Kando

Pattanadech

2020

JMM

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The insulation structure of winding in a large electrical rotating machine consists of epoxy resin and mica material. The insulation structure is composed of many junctions. The insulation problems generate different kinds of signals, such as electromagnetic waves, which may get released from the non-perfect characteristics of the enclosure. This signal may interfere with the functioning of other nearby electronic devices. Therefore, maintaining an excellent condition of the insulation system of the machine is very important. For a condition monitoring of this insulation as proposed in this research, it is taken into consideration the results of the polarization and depolarization current (PDC) measurement of the test sample, and the stator winding rated 13.8 kV was investigated. The experiments were conducted under different thermal stresses, i.e., 25°C (the room temperature) and 100°C (the operation temperature). The test samples were divided into three types: I. haft-overhang, II. overhang and III. full stator bar. From the PDC measurement data record, the complex capacitance and polarization losses (ion migration polarization, slow relaxation polarization and interfacial polarization) were calculated. It was found that the aging of the insulation related to the complex capacitance and polarization losses can be contributed for research in future wireless technology.

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“…These fillers are added according to the requirement for improved electrical, thermal, mechanical, and erosion/tracking characteristics. Some of the most commonly used inorganic filler for the improvement of characteristics are silica, alumina trihydrate, alumina, magnesium hydroxide, carbon black, and calcium carbonate [13][14][15][16][17][18][19]. Among all these fillers, silica is one of the widely used option.…”

Section: Introductionmentioning

confidence: 99%

Investigation of 9000 hours multi-stress aging effects on High-Temperature Vulcanized Silicone Rubber with silica (nano/micro) filler hybrid composite insulator

et al. 2021

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Degradation in the polymeric insulators is caused due to the environmental stresses. The main aim of this paper is to explore the improved aging characteristics of hybrid samples by adding nano/micro silica in High Temperature Vulcanized Silicone Rubber (HTV-SiR) under long term accelerated aging conditions for 9000 hours. As HTV-SiR is unable to sustain environmental stresses for a long time, thus a long term accelerated aging behavior is an important phenomenon to be considered for field application. The aging characteristics of nano/micro filled HTV-SiR are analyzed by using techniques such as Scanning Electron Microscopy (SEM), Leakage Current (LC), Fourier Transform Infrared Microscopy (FTIR), Hydrophobicity Classification (HC), and breakdown strength for the aging time of 9000 hours. FTIR and leakage currents are measured after every cycle. All the co-filled samples revealed escalated aging characteristics as compared to the neat sample except the SN8 sample (8% nano-silica+20% micro-silica) after 9000 hours of aging. The highest loading of 6% and 8% nano-silica with 20% micro-silica do not contribute to the improved performance when compared with the neat and hybrid samples. However, from the critical experimental analysis, it is deduced that SN2 sample (2% nano-silica+20% micro-silica) is highly resistant to the long term accelerated aging conditions. SN2 has no cracks, lower loss percentages in the important FTIR absorption peaks, higher breakdown strength and superior HC after aging as compared to the unfilled and hybrid samples.

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Moisture absorption, desorption, and moisture-induced electrical performances of high-temperature vulcanized silicone rubber

Cited by 33 publications

References 20 publications

Property Failure of Silicone Rubber Caused by Silicone Grease Absorption

Property Failure of Silicone Rubber Caused by Silicone Grease Absorption

The Investigation of Insulation Performance Evaluation of the Large Electrical Rotating Machine in Frequency Domain

Investigation of 9000 hours multi-stress aging effects on High-Temperature Vulcanized Silicone Rubber with silica (nano/micro) filler hybrid composite insulator

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