| Title |
Study on the Development of FGM for Electric Field Relaxation in HVDC Cable Joints |
| Authors |
김유민(Yu-Min Kim) ; 이재복(Jae-Bok Lee) ; 이경주(Kyoung-Joo Lee) ; 최승규(Seung-Kyu Choi) ; 곽지혜(Ji-Hye Kwak) ; 정현학(Hyun-Hak Jung) ; 김명진(Myungchin Kim) ; 강성만(Sung-Man Kang) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.3.516 |
| Keywords |
FGM; Field Grading Material; Functionally Graded Material; Cable Joint; HVDC; FEM; Nonlinear Conductive Material |
| Abstract |
This study aimed to evaluate the electrical performance of a M.V.(Micro Varistor) based FGM(Field Grading Material) to maximize the field-relaxation effect in HVDC(High Voltage Direct Current) systems. The research applied the in house developed FGM to a 525 kV class HVDC cable joint and conducted electromagnetic field analysis under S/IMP(Superimposed Impulse) and LC(Load Cycle) test conditions. As a result, in the joint model with FGM, the maximum electric field under S/IMP conditions significantly decreased from approximately 36.3 /mm to 17.8 /mm, confirming its effective mitigation of voltage concentration. Although a ㎸ ㎸ slight increase in maximum electric field was observed under LC conditions due to FGM application, the field relaxation effect under S/IMP conditions was predominant, resulting in a substantial improvement in overall insulation stability. These findings provide a technical foundation for enhancing the long term insulation performance and reliability of HVDC systems, suggesting the practical applicability of FGM based insulation technology in high voltage environments within future HVDC power grids. |