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Space Charge Characteristics of Coaxial Cable Insulation

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Polymer Insulation Applied for HVDC Transmission

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Abstract

The accumulation of space charge inside the insulation of high-voltage direct current (HVDC) cable may lead to serious distortion of the internal electric field distribution and thus extremely influence the long-term reliability. In addition, a temperature gradient effect, caused by the Joule heat originating from the current in the HVDC cable core conductor, forms across the cable insulation when the cable is loaded in service. To date, extensive research about the space charge behaviors in plane samples under a temperature gradient condition has been reported. However, it is still questionable whether the results of plane samples can reflect the charge characteristics in an actual cable directly. Therefore, it is of great significance to measure and research the space charge behaviors in an actual full-size coaxial cable. In this chapter, space charge measurements for full-size coaxial cables are summarized, and the corresponding recovery algorithms are introduced. Besides, the space charge behaviors for 10 and 160 kV cables under different temperature gradients are analyzed, the results show that obvious hetero-charges accumulate near the outer semi-conductor electrode of the cables under temperature gradients, which are injected from the inner conductor electrode and then migrate to the outer semi-conductor one. And the hetero-charges near the outer semi-conductor electrode increase with the temperature gradients.

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Author information

Authors and Affiliations

  1. School of Electrical Engineering, Xi’an University of Technology, Xi’an, China

    Chi Chen

  2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, China

    Xia Wang & Kai Wu

  3. Electric Power Research Institute, China Southern Power Grid, Guangzhou, China

    Chuanhui Cheng

Authors
  1. Chi Chen
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  2. Xia Wang
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  3. Kai Wu
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  4. Chuanhui Cheng
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Corresponding author

Correspondence to Chi Chen .

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Editors and Affiliations

  1. School of Electrical and Information Engineering, Tianjin University, Tianjin, China

    Boxue Du

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Chen, C., Wang, X., Wu, K., Cheng, C. (2021). Space Charge Characteristics of Coaxial Cable Insulation. In: Du, B. (eds) Polymer Insulation Applied for HVDC Transmission. Springer, Singapore. https://doi.org/10.1007/978-981-15-9731-2_7

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  • DOI: https://doi.org/10.1007/978-981-15-9731-2_7

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