Preparation and Performance Evaluation of Ultra-thin Grain-oriented Silicon Steel Coating for Saturable Reactor of Ultra-high Voltage Direct Current Converter Valves
CHENG Ling1,2, HAN Yu2, MA Guang2, MENG Li1, YANG Fuyao2, CHEN Xin2, DONG Han1
1 Department of Metallurgical Technology, Central Iron and Steel Research Institute, Beijing 100081, China 2 State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute Co., Ltd., Beijing 102211, China
Abstract: Saturated reactor is the key equipment which can protect the thyristor in ultra-high voltage direct current (UHVDC) converter valve, and ultra-thin grain-oriented (UTGO) silicon steel is the core material for the manufacture of saturable reactor core. In this paper, an inorganic insulating coating on the surface of UTGO steel was prepared by using aluminium phosphate, nano-aluminium silicate and chromic anhydride as the main raw materials. The morphology and composition of the coating were characterized by scanning electron microscopy (SEM) and X-ray energy dispersive analysis (EDS), and the relationship between coating thickness and reduction rate of core loss was quantitatively studied. The magnetic properties, magnetostriction and noise characteristics of UTGO steel at different frequencies, tensile stress, harmonic number/content/phase difference were studied. Results show that, under the optimum sintering and solidification process at 700℃/20 s, the adhesion of the coating is grade A and the insulation resistance coefficient reaches 22.5 Ω·cm2. The mathematical equation between reduction rate of core loss ΔP and coating thickness δ is established, and the effective range of independent variable δ is determined to be 0.3—1.5 mm. The variation rules of core loss of thin strip at frequencies of 50 Hz—10 kHz, 5 times, 7 times, 9 times, 11 times harmonics and phase difference of 0°, 90° and 180°were obtained. When the applied tensile stress increases from 0 MPa to 20 MPa, the magnetostrictive coefficient and noise decrease first and then rise, the λp-p and LvA reach the lowest point under 4—5 MPa tensile stress. The key parameters of coating and magnetic properties meet the requirements of UHVDC engineering application. The results can support the structural design and processing optimization of saturated reactor core, and promote the localization of high quality UTGO steel strip.
作者简介: 程灵,全球能源互联网研究院高级工程师,钢铁研究总院在职博士研究生。以第一作者在Scripta Materialia、Journal of Magnetism and Magnetic Materials(同时担任审稿人)、《中国电力》等期刊上发表论文10余篇,申请国家发明专利12项。作为课题执行负责人,开展多项国家电网公司科技项目研究,主要涉及电工磁性材料在输变电设备中的应用技术研究。
引用本文:
程灵, 韩钰, 马 光, 孟利, 杨富尧, 陈新, 董瀚. 特高压直流换流阀饱和电抗器用超薄取向硅钢涂层制备与性能评估[J]. 材料导报, 2020, 34(18): 18139-18144.
CHENG Ling, HAN Yu, MA Guang, MENG Li, YANG Fuyao, CHEN Xin, DONG Han. Preparation and Performance Evaluation of Ultra-thin Grain-oriented Silicon Steel Coating for Saturable Reactor of Ultra-high Voltage Direct Current Converter Valves. Materials Reports, 2020, 34(18): 18139-18144.
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2020, Vol. 34 
