Numerical Analysis of Electric Field Characteristics and Interfacial Pressure of HVDC XLPE Cable Joint Considering Load Cycles

Recent innovations in HVDC extruded cable systems require the development of reliable and safe cable accessories. Cable accessories are made of several insulating materials and contain several interfaces. Interfaces made of different materials can cause electric field distortion and local-ized enhan...

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Bibliographic Details
Main Authors: Kim, J.-H (Author), Kim, S.-J (Author), Lee, B.-W (Author), Lee, D.-G (Author)
Format: Article
Language:English
Published: MDPI 2022
Subjects:
Online Access:View Fulltext in Publisher
LEADER 03308nam a2200421Ia 4500
001 10.3390-en15134684
008 220718s2022 CNT 000 0 und d
020 |a 19961073 (ISSN) 
245 1 0 |a Numerical Analysis of Electric Field Characteristics and Interfacial Pressure of HVDC XLPE Cable Joint Considering Load Cycles 
260 0 |b MDPI  |c 2022 
856 |z View Fulltext in Publisher  |u https://doi.org/10.3390/en15134684 
520 3 |a Recent innovations in HVDC extruded cable systems require the development of reliable and safe cable accessories. Cable accessories are made of several insulating materials and contain several interfaces. Interfaces made of different materials can cause electric field distortion and local-ized enhancement of the field. In addition, the internal temperature profiles of accessories differ depending on load conditions or installation environments, which may lead to an increase in or loss of interfacial pressure due to changes in the mechanical properties of materials. The loss of interfacial pressure degrades the contact state between materials. The micro voids formed due to pressure loss can cause partial discharge and tree, which in turn can lead to reduced lifespan and failure of the cable system. Therefore, it is necessary to study the electrical and mechanical characteristics of cable accessories considering various transient states. However, there is a limit to experimentally analyzing the actual structure. In this paper, electric field and mechanical stress for pre-molded cable joints were analyzed using an electrical model based on the conductivity of the material and a mechanical model based on elastic theory. Temperature fluctuations were simulated according to the sequence of the cable load cycle test, and time-varying electric fields and mechanical stresses were analyzed. From the simulation results, it was confirmed that the electric field and stress distribution in the joint continuously changed according to the heating and cooling periods. In addi-tion, during the cooling cycle, the field strength at the interface near the conductor increased and the interface pressure decreased. In conclusion, it is important to ensure sufficient initial pressure so that the dielectric strength at the interface does not decrease even if there is a loss of interface pressure due to temperature fluctuations. © 2022 by the authors. Licensee MDPI, Basel, Switzerland. 
650 0 4 |a cable accessories 
650 0 4 |a Cable accessories 
650 0 4 |a cable insulation 
650 0 4 |a Cable insulation 
650 0 4 |a Cable systems 
650 0 4 |a elastic materials 
650 0 4 |a Elastic materials 
650 0 4 |a Electric field stress 
650 0 4 |a Electric insulation 
650 0 4 |a Finite element analyse 
650 0 4 |a finite element analysis 
650 0 4 |a Finite element method 
650 0 4 |a HVDC cables 
650 0 4 |a HVDC power transmission 
650 0 4 |a interface pres-sure 
650 0 4 |a Interface pre-sure 
650 0 4 |a Interfaces (materials) 
650 0 4 |a Interfacial pressure 
650 0 4 |a Load cycle 
650 0 4 |a Partial discharges 
650 0 4 |a Temperature distribution 
700 1 |a Kim, J.-H.  |e author 
700 1 |a Kim, S.-J.  |e author 
700 1 |a Lee, B.-W.  |e author 
700 1 |a Lee, D.-G.  |e author 
773 |t Energies