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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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

Received: 07 November 2022

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TM247

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	Li Zhen
	Zheng Haifeng
	Chen Junqi
	Ye Cheng
	Zhang Zhenpeng
	Zhao Hong
	Zhang Weichao

Cite this article:

Li Zhen,Zheng Haifeng,Chen Junqi等. Manufacture Technologies of High-Voltage Submarine Cable Factory Joint Based on Magnetic Induction Combined Heating[J]. Transactions of China Electrotechnical Society, 2024, 39(3): 820-835.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.222109 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I3/820

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