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

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 characte...

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Bibliographic Details
Published in:Applied sciences 2020-04, Vol.10 (8), p.2915
Main Authors: Cui, Yingchao, Yin, Hongxia, Xing, Zhaoliang, Guo, Xiangjin, Zhao, Shiyi, Wei, Yanhui, Li, Guochang, Xin, Meng, Hao, Chuncheng, Lei, Qingquan
Format: Article
Language:English
Subjects:
Cables
Carbon black
Composite materials
Conductors
Crosslinking
Direct current
Electric fields
Electric power transmission
Electrical resistivity
Electron microscopy
Hot pressing
HVDC transmission
Injection
La0.6Sr0.4CoO3
Lanthanum strontium cobaltous oxide
Low density polyethylenes
Nanoparticles
Nitrates
Particle size
Particulate composites
Perovskites
Polyethylene
Polymers
Positive temperature coefficient
PTC effect
Pulsed electroacoustic method
Scanning electron microscopy
semiconductive layer
Space charge
Thermally stimulated current
Transmission electron microscopy
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10082915