The Space Charge Behavior and Luminescence Phenomena in Polymers at 77 K

Shimizu, Noriyuki; Katsukawa, Hiroyuki; Miyauchi, Masaru; Kosaki, M.; Horii, Kenji

doi:10.1109/tei.1979.298229

Cited by 101 publications

(32 citation statements)

References 6 publications

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“…However, little attention has been paid to the effect of absorbed oxygen in the free volume of polymers [2,3J. We have previously studied electrical treeing phenomena in polyethylene at low temperature (77 K) [4,5]. The treeing resistivity at 77 K is much higher than that at room temperature [4J.…”

Section: Introductionmentioning

confidence: 99%

The effect of absorbed oxygen on electrical treeing in polymers

Shimizu

Mori

Kosaki

et al. 1982

1982 IEEE International Conference on Electrical Insulation

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This paper describes the effect of the oxygen absorbed in the free volume of polyethylene on electr~ cal treeing phenomena. The ac tree initiation and growth were investigated at room temperature using virgin samples and also samples degassed by a vacuum pump. The tree starting voltage of the degassed samples is much higher than that of virgin samples. The exper~ mental results show this improvement can be attributed to the removal of oxygen from PE. We also observed in detail the processes of tree initiation and growth in the degassed samples. The observations with other results led us to conclude that the charge carriers injected from the point electrode playa dominant role in the tree initiation.

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Section: Introductionmentioning

confidence: 99%

The effect of absorbed oxygen on electrical treeing in polymers

Shimizu

Mori

Kosaki

et al. 1982

1982 IEEE International Conference on Electrical Insulation

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“…It has been reported that luminescence appears during the initiation phase. 28,29 This may indicate that low-density domains (or large size nanovoids) have been formed in the initiation stage because of the very high field at and near the point electrode tip. The appearance of luminescence indicates the occurrence of impact ionization inside the low-density domains.…”

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confidence: 99%

Formation and inhibition of free radicals in electrically stressed and aged insulating polymers

Yang

Wang

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:Previous work has shown that prebreakdown, electrical aging, and breakdown phenomena are directly associated with charge carriers injected from electrical contacts and their subsequent dissociative trapping and recombination. In addition, the energy released from each trapping or recombination event is dissipated in the breaking of the bonds of macromolecules, thus forming free radicals and new traps in the electrically stressed insulating polymers, as predicted by Kao's model. It is this gradual degradation process that leads to electrical aging and destructive breakdown. New experimental results are presented to confirm previous findings and a new approach to inhibit the degradation process by the incorporation of suitable dopants into the polymer. The concentration of free radicals in the polymer increases with an increasing electric field at a fixed stress time of 250 h and with increasing stress time at a fixed electric field of 833 kV cm Ϫ1 . The concentration of free radicals is directly related to the concentration of new traps created by stress. However, when suitable dopants are incorporated, the initiation voltage for the occurrence of electrical treeing and the breakdown strength are both increased. The dopants tend to create shallow traps and have little effect on the deep trap concentration. This implies that the dopants act as free-radical scavengers that tend to satisfy the unpaired electrons of the broken bonds, which create new acceptor-like electron traps and new shallow traps. By doing so, the shallow traps screen the deep traps, thereby reducing the energy released during trapping and recombination and the probability of breaking the macromolecular bonds and causing structural degradation.

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“…However, very limited studies were conducted on the effects of frequency of applied voltage on the behavior of EL emission. A study by [10] on LDPE subjected to applied frequency of 60Hz to 10kHz under divergent field configuration, found that the EL intensity decreases for increasing frequencies. For LDPE of 50 μm thickness subjected to frequencies in the range of 10 -2 Hz to 10 2 Hz under uniform field configuration, there is a constant increase in EL counts per cycle for increasing frequency for applied voltage below 80 kV/mm as obtained by [11].…”

Section: Frequency Dependance Of Electroluminescence Measurement In Lmentioning

confidence: 99%

Frequency Dependence of Electroluminescence Measurement in LDPE

Bani

Abdul‐Malek

Aris

et al. 2017

IJECE

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A good insulator for high voltage cable has low dielectric loss, reasonable flexibility and thermo-mechanically stable. However, prolonged application of electrical stresses on the cable will degraded the cable; physically and morphologically. Electrical degradation in high voltage cable can be detected using electroluminescence (EL) method. Electroluminescence is a phenomenon that occurs when the atoms of a material are being excited due to the application of and external high electrical stresses. There are several external factors that affect the behaviour of electroluminescence emission such as, applied voltage, applied frequency, ageing of material and types of materials. . In this paper, the EL measurement is employed to determine the effect of applied frequency on virgin LDPE at fixed and varying applied voltage. It can be observed that EL emission increases as applied frequency increases with increasing voltage applied. However, interesting EL behaviour is observed when varying frequency is applied from 10 Hz to 100 Hz.

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The Space Charge Behavior and Luminescence Phenomena in Polymers at 77 K

Cited by 101 publications

References 6 publications

The effect of absorbed oxygen on electrical treeing in polymers

The effect of absorbed oxygen on electrical treeing in polymers

Formation and inhibition of free radicals in electrically stressed and aged insulating polymers

Frequency Dependence of Electroluminescence Measurement in LDPE

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