Electrical treeing behavior at high temperature in XLPE cable insulation samples

Chen, Xiangrong; Yang, Xu; Cao, Xiaolong; Gubanski, Stanislaw

doi:10.1109/tdei.2015.004784

Cited by 60 publications

(41 citation statements)

References 29 publications

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“…The discharged cavities, however, do not necessarily lead to the breakdown of the contact spots immediately. The PD/electrical treeing resistance of the insulation determines the withstanding ability of the contact spots against interfacial discharge [4][5][6][7]. In the hypothesis, the cavity discharge and treeing resistance will be correlated with the interfacial breakdown.…”

Section: Background and Theorymentioning

confidence: 99%

“…The field reduces considerably (i.e., short-circuited) in a discharged cavity until the discharge is quenched whereas it is at the rated value in the bulk insulation as illustrated in Figure 2. Whether the resulting local field spikes (due to discharges in the cavities) can cause a complete flashover (i.e., interfacial discharge) across the interface strongly depend upon the electric treeing resistance of the insulation [5][6][7]. Figure 2.…”

Section: Estimation Of Treeing Resistance Andmentioning

confidence: 99%

“…An interface contains microscopic imperfections such as cavities, protrusions, and contaminants that can reduce the tangential AC electric breakdown strength (BDS) of the interface since these imperfections cause local electric field enhancements [3]. Local fields are likely to initiate partial discharges (PD) and trigger electrical treeing that can lead to tracking failure eventually [4,5]. Studies of insulating materials for cables and accessories have been covered extensively in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Studies of insulating materials for cables and accessories have been covered extensively in the literature. The interfacial breakdown (BD) between the contacting surfaces of two dielectric materials was reported to represent one of the principal causes of failure for power cable joints and connectors, where elastic modulus plays a critical role [4][5][6][7]. Under varying interfacial pressures, the elastic modulus has a significant influence on the structure of the cavities at the interfaces [8], and hence on the BDS of the interface [9].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of elastic modulus on the tangential AC breakdown strength of polymer interfaces

Kantar

Ildstad

Hvidsten

2019

IEEE Trans. Dielect. Electr. Insul.

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Solid-solid interfaces between insulating materials dictate the long-term electricalproperties of the complete insulation system. This paper presents theoretical and experimental investigations aiming to address the impact of the material elasticity on tangential AC breakdown strength (BDS) of interfaces between polymers. Four different polymers with different elastic moduli were tested using: Cross-linked polyethylene (XLPE), filled epoxy resin (EPOXY), polyether ether ketone (PEEK) and silicone rubber (SiR). The interfaces were formed between identical specimens and were breakdown tested at various contact pressures. It was found that elastic modulus and contact pressure had pronounced effects on the BDS of interfaces. Higher elastic modulus correlated with decreased BDS by a factor of 1.6 at the same contact pressure. On the other hand, the increase of contact pressure by a factor of 3 elevated the interfacial BDS by a factor of 1.4 in the case of the lowest elastic modulus (SiR-SiR) whereas that for the highest modulus (PEEK-PEEK) was about 2.4 times higher. Using the proposed theoretical approach, we postulated that discharged cavities govern the interfacial BDS at the interface together with the electric treeing resistance of contact area between the cavities. Although the electrical treeing resistance increases with a higher modulus, local field enhancements due to discharged cavities also increase significantly. Therefore, the observed reduction of the BDS with the increase of the elastic modulus is ascribed to the larger cavity size and hence the smaller contact area. It is concluded that increased elastic modulus reduces the dominance of the discharged cavities over the interface breakdown and increase the governance of the electrical treeing resistance of the contact spots.

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Section: Background and Theorymentioning

confidence: 99%

Section: Estimation Of Treeing Resistance Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of elastic modulus on the tangential AC breakdown strength of polymer interfaces

Kantar

Ildstad

Hvidsten

2019

IEEE Trans. Dielect. Electr. Insul.

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“…Owing to the harsh working conditions of power electrical equipment, there have been many investigations to determine the influence of temperature, voltage type, voltage frequency, thermal aging, and moisture on electrical treeing characteristics [8][9][10][11][12][13][14][15]. Partial discharge characteristics, treeing imaging technology, and channel characteristics have also been studied in order to better understanding the initiation and growth mechanisms of electrical treeing [2,7,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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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Polypropylene‐based soft ternary blends for power cable insulation at low‐to‐high temperature

Hong

Lee

Han

et al. 2021

J of Applied Polymer Sci

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Although cross-linked polyethylene (XLPE) has been widely used as a power cable insulation material in electricity infrastructure for decades, it is necessary to find alternatives that exhibit higher performance than XLPE to meet the increasing demand of the industry. To this end, polypropylene (PP) ternary blends that are soft and exhibit high temperature stability were fabricated by melt blending isotactic PP, ethylene-1-octene polyolefin elastomer and ethylene-propylene random copolymer. These blends exhibited improved higher impact resistance at low temperatures (À40 C) and room temperature than pristine iPP. The blends were mechanically stable even when the temperature was increased to ~120 C, unlike XLPE that exhibited rapid degradation of its modulus above ~90 C. Moreover, the soft ternary blends exhibited increased direct current volume resistivity and breakdown strength. Our work realizes the development of high-performance insulators for power cables that can be used over a wide range of temperatures from cold to hot environments.

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Electrical treeing behavior at high temperature in XLPE cable insulation samples

Cited by 60 publications

References 29 publications

Effect of elastic modulus on the tangential AC breakdown strength of polymer interfaces

Effect of elastic modulus on the tangential AC breakdown strength of polymer interfaces

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

Polypropylene‐based soft ternary blends for power cable insulation at low‐to‐high temperature

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