Effects of Isothermal Crystallization on Carrier Transport and Breakdown Characteristics of HDPE/LDPE Insulation
DOI:
https://doi.org/10.54097/hset.v7i.1096Keywords:
Polyethylene, Crystallinity morphology, DC conductivity, Breakdown characteristics, Trap characteristicsAbstract
In this paper, the influence of the crystalline morphology of high-density polyethylene (HDPE)/low density polyethylene (LDPE) blend on its electrical conductivity, breakdown performance and trap distribution were studied by using the method of isothermal crystallization. Five HDPE/LDPE blends were prepared by melt blending method, and they were cooled to 118°C for isothermal crystallization treatment for 0, 5, 10, 20 and 40 min. The experimental results show that HDPE/LDPE blend with 10min isothermal crystallization time has the lowest conductivity at 70℃, and its conductivity-temperature dependence is also low. As the isothermal crystallization time increases from 0 to 10min, both the DC and AC breakdown strengths of HDPE/LDPE blend increase, and further increase the isothermal crystallization time to 20 and 40min, the breakdown performance of HDPE/LDPE blend decreases significantly. The aggregate structure of HDPE/LDPE blend is closely related to its electrical properties. When the isothermal crystallization time is 10 min, the HDPE/LDPE blend shows a denser crystalline morphology and introduces many of deep traps measured by the isothermal discharge current (IDC) method. Therefore, space charge accumulation and local electric field distortion in the dielectrics are reduced. Also, the breakdown field strength of the HDPE/LDPE blend is improved.
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Z. L. Li and B. X. Du, Polymeric insulation for high-voltage dc extruded cables: challenges and development directions, IEEE Electr. Insul. Mag. 34(6) (2018), 30–43.
G. Chen, M. Hao, Z. Q. Xu, A. Vaughan, J. Z. Cao and H. T. Wang, Review of high voltage direct current cables, CSEE J. Power and Energy Systems 1(2) (2015), 9-21.
G. Teyssedre and C. Laurent, Advances in high-field insulating polymeric materials over the past 50 years, IEEE Electrical Insulation Magazine 29(5) (2013) 26–36.
Leuzzi R , Monopoli V G , Rovere L , et al. Analysis and Detection of Electrical Aging Effects on High-Speed Motor Insulation[J]. IEEE Transactions on Industry Applications, 2019, 55(6):6018-6025..
B. X. Du, Z. L. Li and Z. R. Yang, Progress in application and research of HVDC XLPE cable, High Voltage Engineering 43(02) (2017) 344-354.
S. TAZAWA, Recycling of insulated wire and cable and technologies for low environmental impact, The Transactions of the Institute of Electrical Engineers of Japan B 123(3) (2003) 265-268.
X. Y. Huang et al, Material progress toward recyclable insulation of power cables part 2: Polypropylene-based thermoplastic materials, IEEE Electrical Insulation Magazine 36(1) (2020) 8-18.
V. VAHEDY, Polymer insulated high voltage cables, IEEE Electrical Insulation Magazine 22(3) (2006) 13-18.
J. PLATE W, H. LING T, J. F. NUCCIO, Reassessment of polyethylene power cable, IEEE Transactions on Power Apparatus and Systems 82(69) (1963) 990-1002.
C. R. Zhou and G. Chen, Space charge and AC electrical breakdown strength in polyethylene, IEEE Transactions on Dielectrics and Electrical Insulation vol. 24(1) (2017) 559 – 566.
X. Y. Huang, J. Zhang, P. K. Jiang and T. Tanaka, Material progress toward recyclable insulation of power cables. Part 1: Polyethylene-based thermoplastic materials: Dedicated to the 80th birthday of professor Toshikatsu Tanaka, IEEE Electrical Insulation Magazine 35(5) (2019) 7-19.
W. J. PLATE, T. H. LING, J. F. NUCCIO, Reassessment of polyethylene power cable, IEEE Transactions on Power Apparatus and Systems 82(69) (1963) 990-1002.
I. L. HOSIER, A. S. VAUGHAN, S. G. SWINGLER, On the effects of morphology and molecular composition on the electrical strength of polyethylene blends, Journal of Polymer Science Part B: Polymer Physics 8(17) (2000) 2309-2322.
Z. L. Li, and M. S. Fan, Coupling effect of molecular chain displacement and carrier trap characteristics on DC breakdown of HDPE/LDPE blend insulation, Polymers 12(3) (2020) 589.
Xu R , Du B X , Xiao M , et al. Dielectric properties dependent on crystalline morphology of PP film for HVDC capacitors application[J]. Polymer, 2020, 213(3).
K. S. SUH, J. Y. KIM, C. R. LEE, Charge distribution in polyethylene/ethylene vinylacetate laminates and blends, IEEE Transactions on Dielectrics and Electrical Insulation 3(2) (1996) 201-206.
Y. J. Lin, W. C. Du, D. M. Tu, W. Zhong and Q. G. Du, Space charge distribution and crystalline structure in low density polyethylene (LDPE) blended with high density polyethylene (HDPE). Polymer International 54(2) (2005) 465-470.
C. D. GREEN, A. S. VAUGHAN, G. C. STEVENS, Recyclable power cable comprising a blend of slow-crystallized polyethylenes, IEEE Transactions on Dielectrics and Electrical Insulation 20(1) (2013) 1-9.
B. X. Du, C. Liu, Z. L. Li, Effects of Hindered Phenolic Antioxidants on Space Charge and Breakdown Properties of Polypropylene. IEEE Transactions on Dielectrics and Electrical Insulation 28(1) (2021)124-132.
J. G. Simmons and M. C. Tam, Theory of Isothermal Currents and the Direct Determination of Trap Parameters in Semiconductors and Insulators Containing Arbitrary Trap Distributions, Physics Review B 7(8) (1973) 3706-3713.
R. Mi, Effect of morphology and traps on DC conductivity and breakdown of polyethylene nanocomposites, IEEE Transactions on Dielectrics and Electrical Insulation 27(2) (2020) 489–497.
S. Li, D. Xie, G. Qu, L. Yang, D. Min, and Y. Cheng, Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS Applied. Surface. Science 478(1) (2019) 451–458.
W. C. DU, W. ZHONG W, Y. J. LIN, et al. Space charge distribution and crystalline structure in polyethylene blended with EVOH, European Polymer Journal 40(8) (2004) 1987-1995.
Z. L. Li, S. F. Zhou, B. X. Du, M. S. Fan and J. G. Su, Effect of Crystalline Morphology on Electrical Tree Growth Characteristics of High-Density and Low-Density Polyethylene Blend Insulation, IEEE Access, 8(1) (2020) 114413-114421.
Z. L. Li, and B. X. Du, Polymeric Insulation for HVDC Extruded Cables: Challenges and Development Directions," IEEE Electrical Insulation Magazine 34(6) (2018) 30-43.
Y. ZHOU, J. L. HE, J. HU, Evaluation of polypropylene/polyolefin elastomer blends for potential recyclable HVDC cable insulation applications, IEEE Transactions on Dielectrics and Electrical Insulation 22(2) (2015) 673-681.
G. C. Montanari and A. Motori, Thermal Endurance Evaluation of XLPE Insulated Cables, Journal Physics D: Applied Physics 24(7) (1991) 1172-1181.
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