June 3, 2026- On June 3 and 4,Dr. Shang Keke, Associate Professor of Optoelectronic Information Science and Engineering, School of Physics and Technology, Tianjin Polytechnic University, was invited to visit and deliver the specialized technical lecture titled “The Application of Multistrand magnetic Wires includin taped litz Wires, Silk covered litz Wires in Solid-State Transformer” at Tianjin Ruiyuan Electric Material Co., Ltd. This activity was also intended to facilitate academic-technology exchange, to improve the understanding of power electronics of the sales engineering team of Ruiyuan, and to help the company better serve power electronics and new energy market.
In the presentation, Professor Shang elaborated on the physical concepts and principles engineering implications of multi-strand emagnetic wires in solid-state transformers (SSTs). He began by explaining the technical features of SSTs—the next-generation voltage conversion devices based upon power electronic technology that replace conventional 50/60Hz silicon steel transformers that utilize electromagnetic induction with bidirectional power conversion and flexible control made possible by power electronic elements and high-frequency magnetic elements. Solid-state transformers possess various superior features such as small size, light weight, high power density, fast response, and grid-related capabilities, including reactive power compensation, harmonic mitigation, and power routing, when compared with traditional transformer.
Professor Shang discussed the basic technologies and selection principles of Litz wire, taped litz wire and silk covered litz wire. He pointed out the high frequency transformer – the critical element in SSTs – generally works at frequencies between 10 kHz and 200 kHz, or even further that. Under such circumstances, the skin effect and proximity effect significantly increase the AC resistance, resulting in severe copper losses and overheating. The use of litz wire, which is a bundle of individually insulated copper wire twisted together, can effectively mitigate both effects and the high-frequency AC resistance is significantly reduced, it is one of the feasibility factors to achieving high efficiency and high power density in high-frequency transformer. On top of that, taped Litz wire has an additional layer of insulating film wound around the multi-strand enameled copper wire for added insulation protection and mechanical strength and resilience to the extreme high frequency, high voltage operating environment in solid state transformers.
Professor Shang further explained the selection consideration to the application solutions: taped litz wire, profiled rectangular litz wire and triple insulated litz wire type for various work scenarios including Medium-Voltage insulated windings, Low-Voltage High-Current windings and General Purpose High Frequency work. Insights were also shared on emerging trends in Litz wire technology with advancements in high frequency efficiency, improved insulation, and space utilization. Sales engineers from Ruiyuan also participated in the discussion enthusiastically and keenly, realizing that they should keep on breaking through challenges when it comes to the real application problems of customers.
Post time: Jun-14-2026
