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

doi:10.11896/cldb.19090102

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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 λ_p-p and L_vA 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.

Key words： ultra-thin grain-oriented silicon steel insulation coating magnetic properties UHVDC saturable reactor

Published: 12 September 2020

CLC number:

TM275

Fund:This work was financially supported by the National Key Research and Development Program (2017YFB0903901).

About author:: Ling Chengis currently working at Global Energy Interconnection Research Institute (GEIRI) and pursuing his Ph.D. degree in Central Iron and Steel Research Institute, Beijing, China. As the first author he has published more than 10 papers in domestic and foreign periodicals, include Scripta Materialia, Journal of Magnetism and Magnetic Materials, Electric Power, and so on. He has applied 12 national invention patents. He is working on the development and application of magnetic materials in power grid

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	CHENG Ling
	HAN Yu
	MA Guang
	MENG Li
	YANG Fuyao
	CHEN Xin
	DONG Han

Cite this article:

CHENG Ling,HAN Yu,MA Guang, et al. Preparation and Performance Evaluation of Ultra-thin Grain-oriented Silicon Steel Coating for Saturable Reactor of Ultra-high Voltage Direct Current Converter Valves[J]. Materials Reports, 2020, 34(18): 18139-18144.

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http://www.mater-rep.com/EN/10.11896/cldb.19090102 OR http://www.mater-rep.com/EN/Y2020/V34/I18/18139

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