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access icon openaccess Impacts of different defects on electrical field distribution in cable joint

  • Author(s): Haisheng Yang 1 ; Ling Liu 1 ; Kai Sun 1 ; Jinxian Li 2
    • View affiliations
  • Source: Volume 2019, Issue 16, March 2019, p. 3184 – 3187
    DOI:  10.1049/joe.2018.8569 , Online ISSN 2051-3305
This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 23/08/2018, Accepted 19/09/2018, Published 29/10/2018

Defects in cable joints, induced in the process of manufacturing or assembling, can alter the distribution of the electrical field seriously. To investigate the impacts of different defects on electrical field distribution in cable joints, equivalent models of 110 kV cable joints with needle damage, impurity defect and scratch in insulation are established, respectively. The distribution of electrical potential and field strength in cable joints with dissimilar defects is obtained by finite element analysis (FEA). The results indicate that the needle damage, among the three different defects, generates most excessive electrical field strength distortion surrounding the defect, even exceeding the breakdown strength of air. The results show that these defects can easily result in partial discharge (PD), which leads them to pay more attention to the operation of cable joints.

Inspec keywords: partial discharges; electric potential; power cable insulation; cable jointing; finite element analysis

Other keywords: cable joint; dissimilar defects; FEA; breakdown strength; equivalent models; impurity defect; electrical field strength distortion; voltage 110.0 kV; electrical field distribution; partial discharge; finite element analysis; needle damage; electrical potential; insulation

Subjects: Insulation and insulating coatings; Power cables; Finite element analysis; Dielectric breakdown and discharges

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