Study of space-charge effects on dielectric breakdown of polymers by direct probing

Suzuoki, Yasuo; Matsukawa, Yoji; Han, Sang Yun; Fujii, Akihiko; Kim, J.-S.; Mizutani, Teruyoshi; Ieda, Masayuki; Yoshifuji, N.

doi:10.1109/14.155793

Cited by 49 publications

(12 citation statements)

References 13 publications

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“…% can inhibit the charges injecting in the insulation layer more effectively, especially under the stress of 20 kV/mm. The melt range of LDPE is 110-115 • C and the melt point of EVA 7470 is 76 • C. Furthermore, during the preparation of the semi-conductive composite, we also learned that the polymers have melted at 120 • C. Moreover, considering its insulation is polyethylene, the operating temperature of the HVDC cable cannot exceed 363 K [5,6] since the NTC effect occurs at 393 K which is much higher than the operational temperature of the HVDC cable. Thus, the phenomenon can be ignored for HVDC cable.…”

Section: Space Charge Distributionmentioning

confidence: 99%

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Synthesis of a Novel Semi-Conductive Composites Doping with La0.8Sr0.2MnO3 for Excellent Electric Performance for HVDC Cable

et al. 2020

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The semi-conductive layer located between the wire core and the insulation layer in high voltage direct current (HVDC) cable plays a vital role in uniform electric field and affecting space charges behaviors. In this work, the research idea of adding ionic conductive particles to semi-conductive materials to improve the conductive network and reduce the energy of the moving charge inside it and to suppress charge injection was proposed. Semi-conductive composites doped with different La0.8Sr0.2MnO3 (LSM) contents were prepared. Resistivity at different temperatures was measured to investigate the positive temperature coefficient (PTC) effect. Pulse electro-acoustic (PEA) method and thermal-stimulation depolarization currents (TSDC) tests of the insulation layers were carried out. From the results, space charge distribution and TSDC currents in the insulation samples were analyzed to evaluate the inhibitory effect on space charge injection. When LSM content is 6 wt. %, the experimental results show that the PTC effect of the specimen and charge injection are both being suppressed significantly. The maximum resistivity of it is decreased by 53.3% and the insulation sample has the smallest charge amount, 1.85 × 10−7 C under 10 kV/mm—decreased by 40%, 3.6 × 10−7 C under 20 kV/mm—decreased by 45%, and 6.42 × 10−7 C under 30 kV/mm—decreased by 26%. When the LSM content reaches 10 wt. %, the suppression effect on the PTC effect and the charge injection are both weakened, owing to the agglomeration of the conductive particles inside the composites which leads to the interface electric field distortion and results in charge injection enhancement.

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Section: Space Charge Distributionmentioning

confidence: 99%

“…It is one of the key factors threatening the safe operation and restricting the development of HVDC cable. How to suppress the space charge injection from the conductive wire core to the insulation layer has caused wide concern [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Novel Semi-Conductive Composites Doping with La0.8Sr0.2MnO3 for Excellent Electric Performance for HVDC Cable

et al. 2020

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“…Insulating layers tend to accumulate space charge, which causes distortion of the electric field [16,17]. Eventually, the insulating layer is easily aging or mangled [18][19][20]. Until recently, most studies have been limited to the insulation nano-doped polyethylene, which has been attracting more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ionic Conductors on the Suppression of PTC and Carrier Emission of Semiconductive Composites

et al. 2020

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The positive temperature coefficient (PTC) effect of the semiconductive layers of high-voltage direct current (HVDC) cables is a key factor limiting its usage when the temperature exceeds 70 °C. The conductivity of the ionic conductor increases with the increase in temperature. Based on the characteristics of the ionic conductor, the PTC effect of the composite can be weakened by doping the ionic conductor into the semiconductive materials. Thus, in this paper, the PCT effects of electrical resistivity in perovskite La0.6Sr0.4CoO3 (LSC) particle-dispersed semiconductive composites are discussed based on experimental results from scanning electron microscopy (SEM), transmission electron microscopy (TEM) and a semiconductive resistance test device. Semiconductive composites with different LSC contents of 0.5 wt%, 1 wt%, 3 wt%, and 5 wt% were prepared by hot pressing crosslinking. The results show that the PTC effect is weakened due to the addition of LSC. At the same time, the injection of space charge in the insulating sample is characterized by the pulsed electroacoustic method (PEA) and the thermally stimulated current method (TSC), and the results show that when the content of LSC is 1 wt%, the injection of space charge in the insulating layer can be significantly reduced.

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“…We have investigated space charge behaviors in polyethylene by using the laser induced pressure pulse (LIPP) techniques [ 1,2]. In the previous papers[ 1, 3], we have pointed out that oxidation enhances electron injection, conduction current.…”

Section: Introductionmentioning

confidence: 99%

“…The space charge distribution in a LDPE film was measured by using the LIPP technique [ 1,2]. Figure 1 shows the schematic diagram of the LIPP method.…”

Section: Introductionmentioning

confidence: 99%

Effects of oxidation and antioxidants on space charge in polyethylene

Mizutani

Suzuoki

Kon

et al.

Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena

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Space charge and conduction current in low-density polyethylene (LDPE) and antioxidants doped LDPE have been measured. They strongly depended upon oxidation and antioxidants. In LDPE, oxidation enhanced electron injection and, as a result, negative homo space charge near the cathode. In antioxidants doped LDPE, on the other hand, both positive and negative space charges increased with oxidation and then saturated. The conduction current in doped LDPE increased with oxidation in the low oxidation region, decreawd in the intermediate oxidation region and increased again in the high oxidation region. These behaviors can be explained by the enhancement of both electron and hole injection due to oxidized antioxidants and the suppression of the current by carrier traps due to oxidation products in the PE bulk.

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Study of space-charge effects on dielectric breakdown of polymers by direct probing

Cited by 49 publications

References 13 publications

Synthesis of a Novel Semi-Conductive Composites Doping with La0.8Sr0.2MnO3 for Excellent Electric Performance for HVDC Cable

Synthesis of a Novel Semi-Conductive Composites Doping with La0.8Sr0.2MnO3 for Excellent Electric Performance for HVDC Cable

Effect of Ionic Conductors on the Suppression of PTC and Carrier Emission of Semiconductive Composites

Effects of oxidation and antioxidants on space charge in polyethylene

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