On August 7th, 2025, Xi'an Tiangong Electric Co., Ltd. (TGE) welcomed four experts and scholars in the field of lightning protection from the Lightning Protection Equipment and Grounding Research Office of the Lightning Protection Research Institute of China Electric Power Research Institute. Through on-site visits and in-depth inspections, they discussed the professional technology and quality control points of nonlinear metal oxide varistors, which are the core components of lightning protection devices.
Led by General Manager Ge Yuguang of TGE, the four experts visited the TGE MOV manufacturing workshop, arrester manufacturing workshop, and quality inspection area successively. General Manager Ge Yuguang gave a vivid and detailed explanation of the entire production process of varistorss and arresters, intuitively demonstrating TGE's technical advantages in precision manufacturing and high industry standards for quality control. The four experts stopped from time to time to ask questions, interacted with each other, and spoke highly of the fine quality control and intelligent equipment configuration in the manufacturing process.
After the visit, Mr. Zhao Dongyi, Technical Director, conducted in-depth discussions with the experts under the title "Key Manufacturing Technologies and Quality Control of Nonlinear Metal Oxide Varistors".
The discussion focused on five core areas:
Basic research: Focusing on the impact of grain boundary barrier height on varistors performance, and analyzing the physical nature of simulation calculations for internal conductive channels.
Benchmark testing: Comparing the microstructure and electrical properties of varistorss from different manufacturers, covering resistance characteristics, uniformity, and repetitive charge transfer rating capability, so as to grasp the key links for high-level products.
Manufacturing core: Explaining in detail the technical difficulties in key processes such as additive material and raw material mixing, spray drying, and high-temperature sintering, and discussing the company's innovative schemes to ensure the consistency of product performance in large-scale production.
Cutting-edge trends: Exploring the technical challenges of varistorss under complex working conditions such as multiple lightning impulses and polarity reversal impulses, and introducing the research and development progress of new processes such as mechanical grinding/mixing and coating/core-shell.
Application prospects: Combining with the application scenarios of new power systems, discussing the forward-looking technical schemes of AI intelligent lightning protection devices.
During the exchange and discussion, everyone had a lively discussion on cutting-edge topics such as "the impact of impulse current waveform screening on test results". The experts said: "Through this exchange, we not only have a deep understanding of the production process of varistorss, but also a profound comprehension of the relationship between their physical nature and process logic. The exchange and discussion have sparked AI sparks, laying a solid foundation for future cooperation between both parties."
This exchange not only strengthened the technical linkage between TGE and the Lightning Protection Research Institute, but also demonstrated TGE's technical strength as a global leader in the field of metal oxide varistors. In the future, TGE will continue to focus on "excellent quality and innovative strength", deepen cooperation with industry partners, jointly promote the iterative upgrading of lightning protection equipment technology, and safeguard the safety of global power systems.
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