Yüksek Gerilimli Ekipmanlarda Katı Yalıtım Sistemleri: Malzemeler, Yaşlanma Mekanizmaları, Tanılama Yöntemleri ve Gelecek Perspektifleri

Öz

Katı yalıtım sistemleri, yüksek gerilimli (YG) elektrik ekipmanlarının güvenilirliğini, güvenliğini ve hizmet ömrünü sağlamada kritik bir rol oynamaktadır. Yağ–kâğıt yalıtımının ilk dönemlerdeki baskın kullanımından polimerik, reçine esaslı ve kompozit malzemelerin yaygın olarak benimsenmesine kadar, katı yalıtımın evrimi; dielektrik fiziğindeki gelişmeler, üretim teknolojilerindeki ilerlemeler ve artan işletme gereksinimleri tarafından yönlendirilmiştir. Son yıllarda YGDC iletim, ultra-yüksek gerilim işletimi, kompakt ekipman tasarımları ve sürdürülebilirlik gereksinimleri gibi ortaya çıkan zorluklar, katı yalıtım malzemelerinin ve performans sınırlamalarının yeniden ele alınmasına olan ilgiyi artırmıştır. Bu derleme, YG ekipmanlarında kullanılan katı yalıtım sistemlerinin tarihsel gelişimini, güncel ileri teknoloji malzemelerini ve gelecekteki eğilimleri kapsayan kapsamlı bir analiz sunmaktadır. Selüloz esaslı sistemler, epoksi reçineler, polimerik ve termoplastik malzemeler, nanokompozitler ve inorganik yalıtkanlar dâhil olmak üzere başlıca katı yalıtım sınıfları; dielektrik, termal ve mekanik özellikleri açısından eleştirel olarak incelenmiştir. Termal bozunma, kısmi deşarj etkinliği, uzay yükü birikimi ve çevresel etkiler gibi temel yaşlanma mekanizmaları tartışılmıştır. Ayrıca, sürdürülebilir ve geri dönüştürülebilir yalıtım malzemeleri ve sistemleri gibi gelişmekte olan araştırma yönelimleri vurgulanmıştır. Mevcut sınırlamaların ve açık araştırma sorunlarının belirlenmesiyle, bu çalışma yeni nesil YG ekipmanları için katı yalıtım sistemlerinin gelecekteki gelişimine yönelik yapılandırılmış bir bakış açısı sunmaktadır.Anahtar.

Anahtar Kelimeler

• Yüksek gerilim yalıtımı
• Katı dielektrik malzemeler
• Polimer yalıtım
• Nanokompozitler
• Yaşlanma mekanizmaları.

Solid Insulation Systems in High-Voltage Equipment: Materials, Aging Mechanisms, Diagnostics, and Future Perspectives

Öz

Solid insulation systems play a critical role in ensuring the reliability, safety, and lifetime of high-voltage (HV) electrical equipment. From the early dominance of oil–paper insulation to the widespread adoption of polymeric, resin-based, and composite materials, the evolution of solid insulation has been driven by advances in dielectric physics, manufacturing technologies, and increasing operational demands. In recent decades, emerging challenges such as HVDC transmission, ultra-high-voltage operation, compact equipment design, and sustainability requirements have renewed interest in revisiting solid insulation materials and their performance limitations. This review presents a comprehensive analysis of solid insulation systems used in HV equipment, covering historical development, current state-of-the-art materials, and future trends. Major classes of solid insulation, including cellulose-based systems, epoxy resins, polymeric and thermoplastic materials, nanocomposites, and inorganic insulators, are critically examined in terms of their dielectric, thermal, and mechanical properties. Key aging mechanisms, such as thermal degradation, partial discharge activity, space charge accumulation, and environmental effects, are discussed. Furthermore, the review highlights emerging research directions, including sustainable and recyclable insulation materials and systems. By identifying current limitations and open research challenges, this paper provides a structured perspective on the future development of solid insulation systems for next-generation HV equipment.

Anahtar Kelimeler

• High-voltage insulation
• Solid dielectric materials
• Polymer insulation
• Nanocomposites
• Aging mechanisms.

Kaynakça

1. [1] J.R. Laghari, Complex electrical thermal and radiation aging of dielectric films, IEEE transactions on electrical insulation 28(5) (2002) 777-788.
2. [2] H. Jin, P. Morshuis, A.R. Mor, J.J. Smit, T. Andritsch, Partial discharge behavior of mineral oil based nanofluids, IEEE Transactions on Dielectrics and Electrical Insulation 22(5) (2015) 2747-2753.
3. [3] S. Gubanski, Modern outdoor insulation-concerns and challenges, IEEE Electrical Insulation Magazine 21(6) (2005) 5-11.
4. [4] A. Emsley, G. Stevens, Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers, IEE Proceedings-Science, Measurement and Technology 141(5) (1994) 324-334.
5. [5] H.-B. Mu, G.-J. Zhang, Y. Komiyama, S. Suzuki, H. Miyake, Y. Tanaka, T. Takada, Investigation of surface discharges on different polymeric materials under HVAC in atmospheric air, IEEE Transactions on Dielectrics and Electrical Insulation 18(2) (2011) 485-494.
6. [6] R. Liao, Y. Lin, P. Guo, H. Liu, H. Xia, Thermal aging effects on the moisture equilibrium curves of mineral and mixed oil-paper insulation systems, IEEE Transactions on Dielectrics and electrical insulation 22(2) (2015) 842-850.
7. [7] L. Yang, T. Zou, B. Deng, H. Zhang, Y. Mo, P. Peng, Assessment of oil-paper insulation aging using frequency domain spectroscopy and moisture equilibrium curves, IEEE Access 7 (2019) 45670-45678.
8. [8] T. Tanaka, G.C. Montanari, R. Mulhaupt, Polymer nanocomposites as dielectrics and electrical insulation-perspectives for processing technologies, material characterization and future applications, IEEE transactions on Dielectrics and Electrical Insulation 11(5) (2004) 763-784.

9. [9] T.A. Prevost, T. Oommen, Cellulose insulation in oil-filled power transformers: Part I-history and development, IEEE electrical insulation magazine 22(1) (2006) 28-35.
10. [10] M. Rafiq, M. Shafique, A. Azam, M. Ateeq, I.A. Khan, A. Hussain, Sustainable, renewable and environmental-friendly insulation systems for high voltages applications, Molecules 25(17) (2020) 3901.
11. [11] T.T.N. Vu, G. Teyssedre, S. Le Roy, C. Laurent, Space charge criteria in the assessment of insulation materials for HVDC, IEEE Transactions on Dielectrics and Electrical Insulation 24(3) (2017) 1405-1415.
12. [12] D. Fabiani, G.C. Montanari, C. Laurent, G. Teyssedre, P.H. Morshuis, R. Bodega, L. Dissado, A. Campus, U.H. Nilsson, Polymeric HVDC cable design and space charge accumulation. Part 1: insulation/semicon interface, IEEE Electrical Insulation Magazine 23(6) (2007) 11-19.
13. [13] X. Fan, W. Qin, R. Qiu, Y. Zang, W. Lu, Y. Zhang, R. Chen, F. Liang, G. Sun, H. Luo, A review of advanced acoustic‐chemical‐optical partial discharge monitoring techniques for ultra‐high‐voltage gas‐insulated equipment, High Voltage 10(4) (2025) 787-806.
14. [14] P.H. Morshuis, J.J. Smit, Partial discharges at DC voltage: their mechanism, detection and analysis, IEEE Transactions on dielectrics and electrical insulation 12(2) (2005) 328-340.
15. [15] U. Fromm, Interpretation of partial discharges at dc voltages, IEEE transactions on Dielectrics and Electrical Insulation 2(5) (2002) 761-770.
16. [16] M. Florkowski, Influence of insulating material properties on partial discharges at DC voltage, Energies 13(17) (2020) 4305.
17. [17] P. Przybylek, The influence of temperature and aging of cellulose on water distribution in oil-paper insulation, IEEE Transactions on Dielectrics and Electrical Insulation 20(2) (2013) 552-556.
18. [18] S. Alipoori, K. Firuzi, Nanocomposite Based Insulation Systems: A Review of Materials and Techniques for High Voltage Applications, IEEE Transactions on Dielectrics and Electrical Insulation (2025).
19. [19] A. Küchler, High Voltage Engineering: Fundamentals-Technology-Applications, Springer2017.
20. [20] J. Kuffel, P. Kuffel, High voltage engineering fundamentals, Elsevier2000.
21. [21] T.K. Saha, Review of modern diagnostic techniques for assessing insulation condition in aged transformers, IEEE transactions on dielectrics and electrical insulation 10(5) (2003) 903-917.
22. [22] W.J. McNutt, Insulation thermal life considerations for transformer loading guides, IEEE Transactions on power delivery 7(1) (2002) 392-401.
23. [23] F.H. Kreuger, Partial discharge detection in high-voltage equipment, (No Title) (1989).
24. [24] G.C. Stone, I. Culbert, E.A. Boulter, H. Dhirani, Electrical insulation for rotating machines: design, evaluation, aging, testing, and repair, John Wiley & Sons2014.
25. [25] R. Arora, W. Mosch, High voltage and electrical insulation engineering, John Wiley & Sons2022.
26. [26] M.M. Adnan, E.G. Tveten, J. Glaum, M.H.G. Ese, S. Hvidsten, W. Glomm, M.A. Einarsrud, Epoxy‐based nanocomposites for high‐voltage insulation: a review, Advanced Electronic Materials 5(2) (2019) 1800505.
27. [27] A. Alsoud, S.I. Daradkeh, S.R. Al-Bashaish, A.A. Shaheen, A.M. Jaber, A.M. Abuamr, M.S. Mousa, V. Holcman, Electrical Characterization of Epoxy Nanocomposite under High DC Voltage, Polymers 16(7) (2024) 963.
28. [28] J.S. Looms, Insulators for high voltages, IET1988.
29. [29] M. Touzin, D. Goeuriot, C. Guerret-Piecourt, D. Juvé, H.-J. Fitting, Alumina based ceramics for high-voltage insulation, Journal of the European Ceramic Society 30(4) (2010) 805-817.
30. [30] M.Z. Saleem, M. Akbar, Review of the performance of high-voltage composite insulators, Polymers 14(3) (2022) 431.
31. [31] J. Zhang, J. Wang, H. Li, Q. Zhang, X. He, C. Meng, X. Huang, Y. Fang, J. Wu, A Review of Reliability Assessment and Lifetime Prediction Methods for Electrical Machine Insulation Under Thermal Aging, Energies (19961073) 18(3) (2025).
32. [32] M. Choudhary, M. Shafiq, I. Kiitam, A. Hussain, I. Palu, P. Taklaja, A review of aging models for electrical insulation in power cables, Energies 15(9) (2022) 3408.
33. [33] S. Molleti, D. Van Reenen, Effect of temperature on long-term thermal conductivity of closed-cell insulation materials, Buildings 12(4) (2022) 425.
34. [34] B. Liang, R. Lan, Q. Zang, Z. Liu, L. Tian, Z. Wang, G. Li, Influence of thermal aging on dielectric properties of high voltage cable insulation layer, Coatings 13(3) (2023) 527.
35. [35] Á. Lakatos, A. Csík, E. Lucchi, A.D. La Rosa, Thermal performance and ageing effects to model the life cycle assessment of heat-protective thermal insulation materials in pipe systems, International Communications in Heat and Mass Transfer 164 (2025) 108819.
36. [36] Y. Kou, X. Cheng, C.W. Macosko, Degradation and Breakdown of Polymer/Graphene Composites under Strong Electric Field, Journal of Composites Science 6(5) (2022) 139.
37. [37] X. Huang, S. Zhang, P. Zhang, Y. Zhu, J. Xie, M. Yang, L. Han, J. Hu, Q. Li, J. He, Autonomous indication of electrical degradation in polymers, Nature Materials 23(2) (2024) 237-243.
38. [38] A. Nazrin, T. Kuan, D.-E.A. Mansour, R.A. Farade, A.M. Ariffin, M. Abd Rahman, N.I.B.A. Wahab, Innovative approaches for augmenting dielectric properties in cross-linked polyethylene (XLPE): A review, Heliyon (2024).
39. [39] G. Li, Z. Wang, R. Lan, Y. Wei, Y. Nie, S. Li, Q. Lei, The lifetime prediction and insulation failure mechanism of XLPE for high-voltage cable, IEEE Transactions on Dielectrics and Electrical Insulation 30(2) (2022) 761-768.
40. [40] P. Wang, J. Liu, Z. Li, C. Zhang, L. Zhang, S. Wang, M. Zhang, Electrical breakdown mechanism and life prediction of thermal-aged epoxy/glass fibre composites, Polymer Testing 138 (2024) 108552.
41. [41] R. Hari, M. Mohana Rao, Characterization of nano-additive filled epoxy resin composites (ERC) for high voltage gas insulated switchgear (GIS) applications, International Journal of Emerging Electric Power Systems 23(1) (2022) 47-57.
42. [42] I. Fofana, S. Brettschneider, Outdoor Insulation and Gas-Insulated Switchgears, MDPI, 2022, p. 8141.
43. [43] A. Samad, Dielectric exploration and PD detection in high voltage insulation, (2024).
44. [44] N. Pattanadech, R. Haller, S. Kornhuber, M. Muhr, Partial Discharges (PD): Detection, Identification and Localization, John Wiley & Sons2023.
45. [45] G. Mazzanti, Updated review of the life and reliability models for HVDC cables, IEEE Transactions on Dielectrics and Electrical Insulation 30(4) (2023) 1371-1390.
46. [46] M.-R. Halloum, B.S. Reddy, Failure analysis of polymeric outdoor insulators used in HVDC converter stations, Engineering Failure Analysis 158 (2024) 108051.
47. [47] Y. Gao, J. Li, Z. Li, B. Du, Polymer composites with high thermal conductivity for HVDC cable insulation: a review, IEEE Transactions on Dielectrics and Electrical Insulation 30(6) (2023) 2444-2459.
48. [48] L. Zhou, L. Wu, T. Wu, D. Chen, X. Yang, G. Sui, A ‘ceramer’aerogel with unique bicontinuous inorganic–organic structure enabling super-resilience, hydrophobicity, and thermal insulation, Materials Today Nano 22 (2023) 100306.
49. [49] T.D. Koudama, C. Su, Y. Zhao, X. Wu, K. Yuan, S. Cui, X. Shen, X. Chen, Microstructural evolution of a novel TiN ceramic aerogel derived from the organic/inorganic hybrid with excellent anti-oxidation and thermal insulation property, Journal of the European Ceramic Society 44(7) (2024) 4558-4569.
50. [50] C. Liu, L. Tang, Y. Zhang, P. Jiang, N. Wang, X. Yin, J. Yu, Y.-T. Liu, Synthesis of flexible, strong, and lightweight oxide ceramic nanofibers via direct electrospinning of inorganic sol for thermal insulation, The Journal of The Textile Institute 116(1) (2025) 119-128.
51. [51] L. An, J.N. Armstrong, Y. Hu, Y. Huang, Z. Li, D. Zhao, J. Sokolow, Z. Guo, C. Zhou, S. Ren, High temperature ceramic thermal insulation material, Nano Research 15(7) (2022) 6662-6669.
52. [52] R. Pöttgen, T. Fickenscher, 1.2 Inorganic insulation materials, From Construction Materials to Technical Gases (2022) 21.
53. [53] Z. Niu, F. Qu, F. Chen, X. Ma, B. Chen, L. Wang, M. Xu, S. Wang, L. Jin, C. Zhang, Multifunctional integrated organic–inorganic-metal hybrid aerogel for excellent thermal insulation and electromagnetic shielding performance, Nano-Micro Letters 16(1) (2024) 200.
54. [54] R. Gao, Z. Zhou, H. Zhang, X. Zhang, Y. Wu, High-temperature service stability of a novel ceramic composite insulation material, Ceramics International 50(17) (2024) 30402-30410.
55. [55] Y. Yu, Y. Huang, L. Li, L. Huang, S. Zhang, Silica ceramic nanofiber membrane with ultra-softness and high temperature insulation, Journal of Materials Science 57(6) (2022) 4080-4091.
56. [56] E. Zhang, J. Liu, C. Zhang, P. Zheng, Y. Nakanishi, T. Wu, State-of-art review on chemical indicators for monitoring the aging status of oil-immersed transformer paper insulation, Energies 16(3) (2023) 1396.
57. [57] A.A. Adekunle, S.O. Oparanti, I. Fofana, Performance assessment of cellulose paper impregnated in nanofluid for power transformer insulation application: A review, Energies 16(4) (2023) 2002.
58. [58] Z. Jiang, X. Li, H. Zhang, E. Zhang, C. Liu, X. Fan, J. Liu, Research progress and prospect of condition assessment techniques for Oil–Paper insulation used in power systems: A review, Energies 17(9) (2024) 2089.
59. [59] M. Ngwenyama, M.N. Gitau, Application of back propagation neural network in complex diagnostics and forecasting loss of life of cellulose paper insulation in oil-immersed transformers, Scientific Reports 14(1) (2024) 6080.
60. [60] E.F.Q. Saavedra, High performance cellulosic materials to increase the life and reliability of power transformers, Université Grenoble Alpes [2020-....], 2023.
61. [61] P. Przybylek, Thermal ageing of dry cellulose paper impregnated with different insulating liquids—comparative studies of materials properties, Energies 17(4) (2024) 784.
62. [62] A.A. Adekunle, I. Fofana, P. Picher, E.M. Rodriguez-Celis, O.H. Arroyo-Fernandez, Analyzing transformer insulation paper prognostics and health management: A modeling framework perspective, IEEe Access 12 (2024) 58349-58377.
63. [63] S. Lee, 3-D modeling of automatic pressure gelation process for manufacturing gas insulated switchgear spacer using bio-based epoxy composite, Advanced Composite Materials 33(5) (2024) 689-705.
64. [64] Y. Xing, Z. Wang, L. Liu, Y. Xu, Y. Yang, S. Liu, F. Zhou, S. He, C. Li, Defects and failure types of solid insulation in gas‐insulated switchgear: in situ study and case analysis, High Voltage 7(1) (2022) 158-164.
65. [65] B. Du, H. Liang, Epoxy-based Spacers for Gas Insulated Power Apparatus, Springer2023.
66. [66] Y.H. Wang, Z. Chen, J. Li, Z.X. Liu, R. Chen, H.H. Aung, H.C. Liang, B.X. Du, Flexible smart surface coating for GIS/GIL epoxy insulators, IET Nanodielectrics 7(1) (2024) 26-32.
67. [67] H. Yao, B. Du, Z. Wang, W. Li, J. Dong, H. Liang, Research progress on functionally graded materials for epoxy insulators in HV GIL/GIS, Chinese Journal of Electrical Engineering 11(2) (2025) 150-164.
68. [68] A. Ymeri, N. Krasniqi, G. Kicaj, D. Morina, Advantages of a Gas Insulated Substation (GIS), (2023).
69. [69] A.C. Domingos, L. Duarte, A.P. Pinheiro, F.A. Moura, L. Vasconcelos, D.P. de Carvalho, F.E.d.F. Fadel, P.N. Sakai, Comparative Analysis of Insulation Aging in Cross-Linked Polyethylene and Ethylene–Propylene Rubber Cables Through the Progression Rate of Partial Discharge, Energies 18(10) (2025) 2653.
70. [70] J. Zhang, J. Li, H. Li, M. Yang, Y. Li, Y. Qi, Y. Xu, W. Hu, B. Liu, Recent Overview and Future Research Prospects of Cross-linked Polyethylene Materials: Cross-linking Methods and Applications, (2024).
71. [71] Z. Zeng, P. Guo, R. Zhang, Z. Zhao, J. Bao, Q. Wang, Z. Xu, Review of aging evaluation methods for silicone rubber composite insulators, Polymers 15(5) (2023) 1141.
72. [72] K. Sit, A.K. Pradhan, B. Chatterjee, S. Dalai, A review on characteristics and assessment techniques of high voltage silicone rubber insulator, IEEE Transactions on Dielectrics and Electrical Insulation 29(5) (2022) 1889-1903.
73. [73] G. Wu, Y. Fan, Y. Guo, S. Xiao, Y. Liu, G. Gao, X. Zhang, Aging mechanisms and evaluation methods of silicone rubber insulator sheds: a review, IEEE Transactions on Dielectrics and Electrical Insulation 31(2) (2023) 965-979.
74. [74] S.K. Hong, S.H. Lee, J.A. Han, M.S. Ahn, H. Park, S.W. Han, D.H. Lee, S. Yu, Polypropylene‐based soft ternary blends for power cable insulation at low‐to‐high temperature, Journal of Applied Polymer Science 139(6) (2022) 51619.
75. [75] J. Li, K. Yang, K. Wu, Z. Jing, J.Y. Dong, Eco‐friendly polypropylene power cable insulation: Present status and perspective, IET Nanodielectrics 6(3) (2023) 130-146.
76. [76] B.-X. Liu, Y. Gao, J. Li, C.-Y. Guo, B.-S. Si, J.-G. Gao, Y. Chen, B.-X. Du, Polypropylene-based blend with enhanced breakdown strength under gamma-ray irradiation for cable insulation, Nuclear Science and Techniques 36(1) (2025) 12.
77. [77] M. Zhou, H. Wang, X. Ren, G. Chen, Y. Luo, F. Yu, Investigation on effect of semiconducting screen on space charge behaviour of polypropylene‐based polymers for HVDC cables, High Voltage 7(5) (2022) 968-981.
78. [78] Z. Xing, H. Ge, D. Li, S. Guo, B. Yang, C. Gao, B. Qi, J. Hao, Molecular and Microstructural Engineering Strategies for High-Performance Polypropylene Insulation Materials, Energies 18(8) (2025) 2136.
79. [79] G. Yu, Y. Cheng, Z. Duan, Research progress of polymers/inorganic nanocomposite electrical insulating materials, Molecules 27(22) (2022) 7867.
80. [80] E.T. Iverson, H. Legendre, S. Chakravarty, S. Zhang, S.G. Fisher, D.L. Smith, K. Schmieg, Y. Ge, D.S. Antao, P.J. Shamberger, High thermal conductivity polyelectrolyte nanocomposite electrical insulation thin films, Advanced Functional Materials 35(24) (2025) 2420355.
81. [81] W. Dong, M. Ma, Recent developments and advanced applications of promising functional nanocomposites for green buildings: A review, Journal of Building Engineering 102 (2025) 111905 . [82] W. Sekkal, A. Zaoui, Thermal and acoustic insulation properties in nanoporous geopolymer nanocomposite, Cement and Concrete Composites 138 (2023) 104955.
82. [83] Faiza, A. Khattak, A.A. Alahmadi, H. Ishida, N. Ullah, Improved PVC/ZnO nanocomposite insulation for high voltage and high temperature applications, Scientific reports 13(1) (2023) 7235.
83. [84] M. Jia, L. Tang, Y. Lin, X. Zeng, K. Ruan, M. Li, Y. Guo, M. He, Y. Tang, J. Gu, Interfacial engineering for improving thermal conductivities of BNNS/PNF nanocomposite paper with superior electrical insulation and mechanical properties, Journal of Materials Science & Technology (2025).
84. [85] H. Xu, C. Liu, W. Guo, N. Li, Y. Chen, X. Meng, M. Zhai, S. Zhang, Z. Wang, Sodium alginate/Al2O3 fiber nanocomposite aerogel with thermal insulation and flame retardancy properties, Chemical Engineering Journal 489 (2024) 151223.
85. [86] Z.-H. Wu, X.-L. Feng, Y.-X. Qu, L.-X. Gong, K. Cao, G.-D. Zhang, Y. Shi, J.-F. Gao, P. Song, L.-C. Tang, Silane modified MXene/polybenzazole nanocomposite aerogels with exceptional surface hydrophobicity, flame retardance and thermal insulation, Composites Communications 37 (2023) 101402.
86. [87] Q. Ren, W. Li, S. Cui, W. Ma, X. Zhu, M. Wu, L. Wang, W. Zheng, T. Semba, M. Ohshima, Improved thermal insulation and compressive property of bimodal poly (lactic acid)/cellulose nanocomposite foams, Carbohydrate Polymers 302 (2023) 120419.
87. [88] T. Lewis, Interfaces are the dominant feature of dielectrics at the nanometric level, IEEE transactions on dielectrics and electrical insulation 11(5) (2004) 739-753.
88. [89] B. Zhang, Z. Li, S. Hu, X. Luo, Field enhancement for dielectric layer of high-voltage devices on silicon on insulator, IEEE transactions on electron devices 56(10) (2009) 2327-2334.
89. [90] J.P. Heath, J.H. Harding, D.C. Sinclair, J.S. Dean, Electric field enhancement in ceramic capacitors due to interface amplitude roughness, Journal of the European Ceramic Society 39(4) (2019) 1170-1177.
90. [91] G. Mazzanti, M. Marzinotto, Extruded cables for high-voltage direct-current transmission: advances in research and development, (2013).
91. [92] L.A. Dissado, J.C. Fothergill, Electrical degradation and breakdown in polymers, Iet1992.
92. [93] J.J. O'Dwyer, The theory of electrical conduction and breakdown in solid dielectrics, (No Title) (1973).
93. [94] L. Vouyovitch, N. Alberola, L. Flandin, A. Beroual, J.-L. Bessede, Dielectric breakdown of epoxy-based composites: relative influence of physical and chemical aging, IEEE Transactions on Dielectrics and Electrical Insulation 13(2) (2006) 282-292.
94. [95] K. Wu, R. Su, X. Wang, Space charge behavior in polymeric materials under temperature gradient, IEEE Electrical Insulation Magazine 36(2) (2020) 37-49.
95. [96] G.C. Montanari, Bringing an insulation to failure: the role of space charge, IEEE Transactions on Dielectrics and Electrical Insulation 18(2) (2011) 339-364.
96. [97] Y. Chong, G. Chen, Y. Ho, Temperature effect on space charge dynamics in XLPE insulation, IEEE transactions on dielectrics and electrical insulation 14(1) (2007) 65-76.
97. [98] Y. Ho, H. Chen, A. Davies, S. Swingler, S. Sutton, R. Hampton, Effect of semiconducting screen on the space charge dynamic in XLPE and polyolefin insulation under DC and 50 Hz AC electric stresses conditions, IEEE Transactions on Dielectrics and Electrical Insulation 10(3) (2003) 393-403.
98. [99] F. Rogti, Space charge dynamic at the physical interface in cross-linked polyethylene under DC field, IEEE Transactions on Dielectrics and Electrical Insulation 18(3) (2011) 888-899.
99. [100] R. Hackam, Outdoor HV composite polymeric insulators, IEEE Transactions on Dielectrics and Electrical Insulation 6(5) (2020) 557-585.
100. [101] X. Meng, H. Mei, B. Zhu, F. Yin, L. Wang, Influence of pollution on surface streamer discharge, Electric Power Systems Research 212 (2022) 108638.
101. [102] M. Kunicki, Influence of the solid dielectric type on the acoustic emission signals emitted by partial discharges, Measurement 205 (2022) 112165.
102. [103] W. Hassan, M. Shafiq, G.A. Hussain, M. Choudhary, I. Palu, Investigating the progression of insulation degradation in power cable based on partial discharge measurements, Electric Power Systems Research 221 (2023) 109452.
103. [104] P. Mwinisin, A. Mingotti, L. Peretto, R. Tinarelli, M. Tefferi, Electrical Diagnosis Techniques for Power Transformers: A Comprehensive Review of Methods, Instrumentation, and Research Challenges, Sensors (Basel, Switzerland) 25(7) (2025) 1968.
104. [105] M. Awais, X. Chen, C. Dai, Q. Wang, F.-B. Meng, Z. Hong, A. Paramane, Y. Tanaka, Investigating optimal region for thermal and electrical properties of epoxy nanocomposites under high frequencies and temperatures, Nanotechnology 33(13) (2022) 135705.
105. [106] X. Zhou, P. Giangrande, Y. Ji, W. Zhao, S. Ijaz, M. Galea, Insulation for rotating low-voltage electrical machines: Degradation, lifetime modeling, and accelerated aging tests, Energies 17(9) (2024) 1987.
106. [107] X. Chen, L. Liu, X. Li, Y. Wei, Y. Zhu, S. Li, Y. Nie, G. Li, Electrical-Thermal-Mechanical Matching Properties of the Interface between Main Insulation of High Voltage Cables and Accessory Silicone Rubber Insulation, IEEE Transactions on Dielectrics and Electrical Insulation (2025).
107. [108] A.M.S. AL-GHEILANI, Electric stress control in high voltage insulators using multi-layered functionally graded materials, RMIT University, 2024.
108. [109] J. Dong, B. Du, H. Liang, H. Yao, Improved Dielectric Strength of GIL Insulator by Multi-Dimensional Functionally Graded Materials Under Polarity Reversal Voltage, IEEE Transactions on Power Delivery (2024).
109. [110] J.-P. Crine, On the interpretation of some electrical aging and relaxation phenomena in solid dielectrics, IEEE Transactions on Dielectrics and Electrical Insulation 12(6) (2006) 1089-1107.
110. [111] A. Emsley, G. Stevens, A reassessment of the low temperature thermal degradation of cellulose, 1992., Sixth International Conference on Dielectric Materials, Measurements and Applications, IET, 1992, pp. 229-232.
111. [112] Y. Bi̇çen, Y. Çilliyüz, F. Aras, G. Aydugan, An assessment on aging model of IEEE/IEC standards for natural and mineral oil-immersed transformer, 2011 IEEE International Conference on Dielectric Liquids, IEEE, 2011, pp. 1-4.
112. [113] G. Mazzanti, G.C. Montanari, Electrical aging and life models: the role of space charge, IEEE Transactions on Dielectrics and Electrical Insulation 12(5) (2005) 876-890.
113. [114] R. Bartnikas, Partial discharges. Their mechanism, detection and measurement, IEEE Transactions on dielectrics and electrical insulation 9(5) (2002) 763-808.
114. [115] R. Bartnikas, R. Eichhorn, Engineering dielectrics volume IIA electrical properties of solid insulating materials: molecular structure and electrical behavior, ASTM International1983.
115. [116] V. Ghildiyal, C.M. Altaner, B. Heffernan, M.C. Jarvis, Electrical phenomena in trees and wood: A review, Current Forestry Reports 11(1) (2025) 7.
116. [117] S.M. Haque, J.A. Ardila-Rey, Y. Umar, A.A. Mas’ ud, F. Muhammad-Sukki, B.H. Jume, H. Rahman, N.A. Bani, Application and suitability of polymeric materials as insulators in electrical equipment, Energies 14(10) (2021) 2758.
117. [118] C. Mayoux, Degradation of insulating materials under electrical stress, IEEE Transactions on Dielectrics and Electrical Insulation 7(5) (2002) 590-601.
118. [119] F. Akin, O. Arikan, The effect of thermal aging on solid insulating materials: A case study for dielectric loss and dissipation factor based evaluations under different voltage levels and frequencies, Engineering Failure Analysis 148 (2023) 107222.
119. [120] J. Su, L. Wei, J. Zheng, J. Liu, P. Zhang, X. Pang, Y. Xing, Effects of mechanical stress on insulation structure and performance of HV cable, Polymers 14(14) (2022) 2927.
120. [121] X. Qiao, Y. Ming, K. Xu, N. Yi, R. Sundararajan, Aging of polymeric insulators under various conditions and environments: Another look, Energies 15(23) (2022) 8809.
121. [122] R. Tian, K. Li, Y. Lin, C. Lu, X. Duan, Characterization techniques of polymer aging: from beginning to end, Chemical Reviews 123(6) (2023) 3007-3088.
122. [123] C. Chen, C. Cheng, X. Wang, K. Wu, Space charge characteristics for XLPE coaxial cable insulation under electrothermal accelerated aging, IEEE Transactions on Dielectrics and Electrical Insulation 29(2) (2022) 727-736.
123. [124] G. Chen, Ageing, Space Charge and Lifetime of Polymeric Insulating Materials, 2024 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), IEEE, 2024, pp. 1-6.
124. [125] M. Rafiq, M. Shafique, HVDC transformer insulation system: Present research, trends, challenges, and prospects, e-Prime-Advances in Electrical Engineering, Electronics and Energy (2024) 100874.
125. [126] Z. Pang, J. Gao, Y. Ding, Z. Zhu, C. Chi, T. Liu, X. Wu, K. Zhao, Progress in the Localization and Substitution of New Materials in Ultra-High Voltage (UHV) Equipment, Advances in Computer and Materials Scienc Research 1(2) (2025) 29-46.
126. [127] P. Parvizi, A.M. Amidi, M. Jalilian, H. Parvizi, M.R. Zangeneh, Applications of Composite Insulator Systems in HVDC Grids: An Overview, 2025 10th International Conference on Technology and Energy Management (ICTEM), IEEE, 2025, pp. 1-6.
127. [128] Y. Li, Y. Ai, J. Zou, L. Liu, C. Liu, S. Fu, D. Zou, W. Wei, Design and experiment of CLIBOT, a novel UHV insulator climbing robot with discrete optimization, Industrial Robot: the international journal of robotics research and application 51(6) (2024) 985-996.
128. [129] M. Florkowski, B. Florkowska, R. Włodek, Interaction of Coupled Thermal Effect and Space Charge in HVDC Cables, Energies 18(9) (2025) 2206.
129. [130] G. Li, R. Lan, Y. Zheng, H. Long, C. Hao, S. Li, Y. Wei, Aging Characteristics of the Insulation Layer of HVDC Cables and Effect of Space Charge Accumulation on Electric Field Distribution, IEEE Transactions on Dielectrics and Electrical Insulation 31(4) (2024) 1909-1917.
130. [131] Z. Li, Z. Zheng, Y. Wu, B. Du, Space charge and electric field dependent on polarity reversal of hvdc cable insulation, IEEE Transactions on Dielectrics and Electrical Insulation 31(1) (2023) 58-65.
131. [132] Y. Zhou, B. Gao, W. Wang, K. Song, Influence of Polarity Reversal Period and Temperature Gradient on Space Charge Evolution and Electric Field Distribution in HVDC Extruded Cable, Energies 15(3) (2022) 985.
132. [133] S.-J. Kim, S. Lee, W.-S. Choi, B.-W. Lee, Experimental and Simulation Studies on Stable Polarity Reversal in Aged HVDC Mass-Impregnated Cables, Energies 17(10) (2024) 2352.
133. [134] A. Stan, S. Costinaș, G. Ion, Overview and assessment of HVDC current applications and future trends, Energies 15(3) (2022) 1193.
134. [135] G. Mazzanti, HVDC Cable System Testing, High Voltage 10(6) (2025) 1349-1370.
135. [136] G. Teyssedre, T.T.N. Vu, S. Le Roy, Insulating materials for HVDC cable accessories: Effects on the electric field in nonstationary situations, IEEE Electrical Insulation Magazine 38(5) (2022) 6-17.
136. [137] K. Emdadi, M. Gandomkar, A. Aranizadeh, B. Vahidi, M. Mirmozaffari, Overview of monitoring, diagnostics, aging analysis, and maintenance strategies in high-voltage AC/DC XLPE cable systems, Sensors 25(22) (2025) 7096.
137. [138] E. Brancato, Insulation aging a historical and critical review, IEEE Transactions on electrical Insulation (4) (2007) 308-317.
138. [139] T. Oommen, Vegetable oils for liquid-filled transformers, IEEE Electrical insulation magazine 18(1) (2002) 6-11.
139. [140] K.L. Pickering, M.A. Efendy, T.M. Le, A review of recent developments in natural fibre composites and their mechanical performance, Composites Part A: Applied Science and Manufacturing 83 (2016) 98-112.
140. [141] S.A. Ghani, I.S. Chairul, M.S.A. Khiar, N.A. Bakar, N.H. Rahim, S.N.M. Arshad@ Hashim, Eco-friendly electrical insulation materials in high-voltage equipment: Current trend, AIP Conference Proceedings, AIP Publishing LLC, 2025, p. 020003.
141. [142] McShane, Corkran, Rapp, Luksich, Natural ester dielectric fluid development, 2005/2006 IEEE/PES Transmission and Distribution Conference and Exhibition, IEEE, 2006, pp. 18-22.
142. [143] C.P. McShane, J. Corkran, K. Rapp, J. Luksich, Natural ester dielectric fluid development update, 2009 IEEE Power & Energy Society General Meeting, IEEE, 2009, pp. 1-6.
143. [144] M. Rafiq, M. Shafique, M. Ateeq, M. Zink, D. Targitay, Natural esters as sustainable alternating dielectric liquids for transformer insulation system: analyzing the state of the art, Clean Technologies and Environmental Policy 26(3) (2024) 623-659.
144. [145] R.A. Farade, N.I.A. Wahab, D.-E.A. Mansour, M.E.M. Soudagar, The effect of nanoadditives in natural ester dielectric liquids: A comprehensive review on stability and thermal properties, IEEE Transactions on Dielectrics and Electrical Insulation 30(4) (2023) 1478-1492.
145. [146] R.A. Farade, N.I.A. Wahab, D.-E.A. Mansour, The effect of nano-additives in natural ester dielectric liquids: a comprehensive review on dielectric properties, IEEE Transactions on Dielectrics and Electrical Insulation 30(4) (2023) 1502-1516.
146. [147] I. Standard, Environmental management-Life cycle assessment-Requirements and guidelines, London: ISO (2006).
147. [148] C. Zhang, J. Jing, L. Yun, Y. Zheng, H. Huang, A cradle-to-grave life cycle assessment of high-voltage aluminum electrolytic capacitors in China, Journal of Cleaner Production 370 (2022) 133244.
148. [149] A. Shariatkhah, Life cycle assessment of high-voltage switchgears: evaluating environmental sustainability in power distribution networks, (2023).