Self-healing during electrical treeing: A feature of the two-phase liquid-solid nature of silicone gels

Salvatierra, Lucas Matías; Kovalevski, Laura Inés; Quiña, Pablo L. Dammig; Irurzun, I. M.; Mola, E. E.; Dodd, S.J.; Dissado, L.A.

doi:10.1109/tdei.2015.004813

Cited by 22 publications

(17 citation statements)

References 29 publications

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“…The bubble cavities would be less visible as the mechanical strength gets larger. As for the SIR we used in our tests, the elastic shear modulus is around 1~3 MPa which is larger than that in silicone gels (The maximum is 1.5 × 10 5 Pa [30]). Although no bubble cavities were detected under the tree observing system in our tests (shown in Figure 2) when applied by 50-Hz AC voltage, the small punctate cavities could still be observed when the tree channels were exposed under higher-magnification conditions (shown in Figure 10).…”

Section: Potential Growth Model For Electrical Tree In Sirmentioning

confidence: 84%

“…This is consistent with our previous study [7], where we briefly discussed the growth patterns of trees at 50 Hz. Moreover, the bubble cavities were observed in silicone gels as well [30][31][32]. It is found that the form of electrical tree is strongly related to the mechanical strength of the silicone gels [30].…”

Section: Potential Growth Model For Electrical Tree In Sirmentioning

confidence: 92%

“…Moreover, the bubble cavities were observed in silicone gels as well [30][31][32]. It is found that the form of electrical tree is strongly related to the mechanical strength of the silicone gels [30]. The bubble cavities would be less visible as the mechanical strength gets larger.…”

Section: Potential Growth Model For Electrical Tree In Sirmentioning

confidence: 95%

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Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies

et al. 2018

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Abstract:The insulation property at high voltage frequencies has become a tough challenge with the rapid development of high-voltage and high-frequency power electronics. In this paper, the electrical treeing behavior of silicone rubber (SIR) is examined and determined at various voltage frequencies, ranging from 50 Hz to 130 kHz. The results show that the initiation voltage of electrical trees decreased by 27.9% monotonically, and they became denser when the voltage frequency increased. A bubble-shaped deterioration phenomenon was observed when the voltage frequency exceeded 100 kHz. We analyze the typical treeing growth pattern at 50 Hz (including pine-like treeing growth and bush-like treeing growth) and the bubble-growing pattern at 130 kHz. Bubbles grew exponentially within several seconds. Moreover, bubble cavities were detected in electrical tree channels at 50 Hz. Combined with the bubble-growing characteristics at 130 kHz, a potential growing model for electrical trees and bubbles in SIR is proposed to explain the growing patterns at various voltage frequencies.

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Section: Potential Growth Model For Electrical Tree In Sirmentioning

confidence: 84%

Section: Potential Growth Model For Electrical Tree In Sirmentioning

confidence: 92%

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Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies

et al. 2018

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“…In [14,15], the tests performed followed a classical procedure employed in liquids, with the aim to evaluate the streamer inception (streamer is a term commonly employed for the propagating breakdown structure in liquids) and to compare the behavior observed in the gels with that of silicone oil. In [16,17], the experiments focused on lower AC voltages, highlighting the formation and growth of string of bubbles having the shape akin to an electrical tree in a solid insulator (therefore, referred to as electrical trees, indifferently from the case of solid dielectrics). The tree growth and structure where compared with that of the elastomer by means of their fractal dimension.…”

Section: Introductionmentioning

confidence: 99%

“…All the studies concluded that, regardless of the self-healing behavior of silicone gels, a continuous voltage application leads to the formation of discharge-supporting electrical tree structures [13,16,17], the skeleton of which is permanent [17] (i.e. the material is irreversibly damaged).…”

Section: Introductionmentioning

confidence: 99%

Analysis of electrical tree inception in silicone gels

Mancinelli

Cavallini

Dodd

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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This work assesses the initial and crucial part of electrical treeing degradation, the inception stage, focusing on its dependence on applied voltage waveform and frequency. Tests have been performed on needle-plane configuration samples in solids and gels. A physical model has been formulated through an adaptation of an established theory for solids in which electrical tree inception is related to damage-producing injection currents. The voltage rise time appeared to be the most important parameter influencing the tree inception in the gel, while in the solid material the frequency is more relevant. The analysis leads to the conclusion that tree inception in gels is due to a single highenergy event, in contrast to what is commonly known for solids where damage accumulation takes place. A tree inception model is proposed for the gel, in which initiation is driven by a pressure wave generated by the electric field and the space charge injected into the sample. The model fits the experimental data and may be used to predict the tree initiation for different waveforms and voltage values.

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Self‐Healing of Electrical Damage in Polymers

Yang

Dang

et al. 2020

Advanced Science

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Polymers are widely used as dielectric components and electrical insulations in modern electronic devices and power systems in the industrial sector, transportation, and large appliances, among others, where electrical damage of the materials is one of the major factors threatening the reliability and service lifetime. Self‐healing dielectric polymers, an emerging category of materials capable of recovering dielectric and insulating properties after electrical damage, are of promise to address this issue. This paper aims at summarizing the recent progress in the design and synthesis of self‐healing dielectric polymers. The current understanding to the process of electrical degradation and damage in dielectric polymers is first introduced and the critical requirements in the self‐healing of electrical damage are proposed. Then the feasibility of using self‐healing strategies designed for repairing mechanical damage in the healing of electrical damage is evaluated, based on which the challenges and bottleneck issues are pointed out. The emerging self‐healing methods specifically designed for healing electrical damage are highlighted and some useful mechanisms for developing novel self‐healing dielectric polymers are proposed. It is concluded by providing a brief outlook and some potential directions in the future development toward practical applications in electronics and the electric power industry.

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Self-healing during electrical treeing: A feature of the two-phase liquid-solid nature of silicone gels

Cited by 22 publications

References 29 publications

Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies

Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies

Analysis of electrical tree inception in silicone gels

Self‐Healing of Electrical Damage in Polymers

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