基于磁感应联合加热的高压海缆工厂接头制备技术

doi:10.19595/j.cnki.1000-6753.tces.222109

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摘要目前国内外电缆厂家制备工厂接头多采用经典模具单向加热技术（简称单向加热）,虽然部分厂家已对磁感应联合加热技术（简称联合加热）进行应用,但对接头处的温度分布与绝缘性能研究甚少。该文对联合加热与单向加热进行电磁-热仿真计算,根据仿真策略进行试验,并取试样进行界面观测,且对电学性能、交联程度与力学拉伸性能进行对比测试。研究结果表明,通过仿真分析,联合加热中感应线圈向接头区域传递的热流密度远高于金属模具,将预热-交联阶段耗时由单向加热的10 h降低至3 h 20 min,显著提高了加热效率,并使加热区域达到合理温度范围;在联合加热中,与单向加热相比,本体绝缘与恢复绝缘之间的过渡区域宽度明显下降,熔合纹界面质地有所提升,过渡区域绝缘电树枝起始电压升高,在0.2 MPa条件下,过渡区域绝缘热延伸伸长率明显下降,且过渡区域绝缘的力学拉伸性能有所提升。联合加热中,过渡区域绝缘的界面质地、电学性能、交联程度与力学拉伸性能均有所提高的关键性因素是过渡区域绝缘界面的融合性相比于单向加热有所提升。

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	李震
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	赵洪
	张伟超

关键词 ：海缆工厂接头, 热流密度, 界面观测, 电树枝, 热延伸, 力学拉伸

Abstract：In the existing factory joint heating technology, the classical mold unidirectional heating technology (abbreviated as unidirectional heating) has been widely used by domestic and foreign manufacturers. However, the low heating efficiency and the unreasonable temperature distribution of the heating area of this technology will also have a great impact on the heating process of factory joints, and the magnetic induction combined heating technology (abbreviated as combined heating) can effectively solve the above problems.
In this paper, the temperature distribution and insulation performance of the joint in the combined heating technology and unidirectional heating technology are studied. Firstly, the electromagnetic-thermal simulation calculations are carried out, the heating efficiency and temperature distribution of the two technologies are compared and analyzed, and the factory joint manufacturing test is carried out according to the simulation scheme. Secondly, the factory joint insulation manufactured by the above two technologies is successively subjected to macroscopic and microscopic observation of the transition area, the growth characteristics test of electric branches, the test of thermal elongation and the test of mechanical tensile properties, so as to compare and analyze the insulation properties of the joints manufactured by the above two technologies.
The results show that: through simulation analysis, the heat flux transmitted from the induction coil to the joint area in the combined heating technology is much higher than that of the heating mold. The time spent in the preheating-crosslinking stage is reduced from 10 h to 3 h 20 min, and the heating efficiency is significantly improved, and the heating areas are all within a reasonable temperature range; In the combined heating technology, the width of the transition area between the cable insulation and the restored insulation is reduced from 5 mm in the unidirectional heating technology to 1.2 mm, the texture of the fusion pattern is significantly improved, the width is significantly reduced, and the number of defects is reduced; In the combined heating technology, the starting voltage of electrical tree in the transition zone insulation is 9.9% higher than that in the unidirectional heating technology; The thermal elongation of the inner layer transition zone insulation of the combined heating technology is 70% under the load of 0.2 MPa, and there is no obvious difference between the thermal elongation of the inner layer and the outer layer transition zone insulation, while the thermal elongation of the outer layer insulation is 75% in the unidirectional heating technology, and the inner layer insulation is basically broken; Compared with the unidirectional heating technology, the fracture stress of the transition zone insulation in the combined heating technology is increased by 14.6%, and the elongation at break is increased by 20%. It can be analyzed that the interface texture, electrical properties, crosslinking degree and mechanical tensile properties of the transition zone of the joint insulation manufactured by the combined heating technology are significantly improved.
The following conclusions can be drawn from the simulation calculation and test process: (1) The combined heating technology can greatly improve the heating efficiency of the joint and maintain the temperature rationality of the heating area. (2) Compared with unidirectional heating technology, the interface texture, electrical properties, cross-linking degree and mechanical tensile properties of joint insulation manufactured by combined heating technology are significantly improved. (3) The key factor to significantly improve the joint insulation performance in the combined heating technology is to improve the fusion of the insulation interface in the transition zone and effectively reduce the defects at the interface of the transition zone.

Key words： Submarine cable factor joints heat flow density interface observation electric branch thermal extension stress-strain

收稿日期: 2022-11-07

PACS:

TM247

通讯作者: 赵洪男,1955年生,教授,博士生导师,研究方向为聚合物绝缘理论及测试技术。E-mail：hongzhao@hrbust.edu.cn

作者简介: 李震男,1996年生,硕士研究生,研究方向为海缆接头制备工艺及仿真计算。E-mail：1195634687@qq.com

引用本文:

李震, 郑海峰, 陈俊岐, 叶成, 张振鹏, 赵洪, 张伟超. 基于磁感应联合加热的高压海缆工厂接头制备技术[J]. 电工技术学报, 2024, 39(3): 820-835. Li Zhen, Zheng Haifeng, Chen Junqi, Ye Cheng, Zhang Zhenpeng, Zhao Hong, Zhang Weichao. Manufacture Technologies of High-Voltage Submarine Cable Factory Joint Based on Magnetic Induction Combined Heating. Transactions of China Electrotechnical Society, 2024, 39(3): 820-835.

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