Successfully developed the power fittings for UHV transmission and transformation projects
The power fitting is a metal accessory that connects and combines various devices in the power system and protects them. In the review and acceptance organized by the State Grid Corporation of China and the Ministry of Science and Technology, the experts of the acceptance committee agreed that the development of UHV fittings filled the gap of domestic UHV power fittings and the research results reached the international advanced level. The sample design is reasonable and the performance is excellent, which can meet the construction needs of UHV AC transmission line engineering.
Known as the world's first "electric highway", China's 1000 kV UHV AC pilot demonstration project is under construction and is scheduled to be put into commercial operation this year. At the same time, the ±800 kV DC UHV project Yunguang line was also opened recently. Nanjing Line Equipment Factory is currently stepping up the production of UHV power fittings to meet construction needs.
Read the link: China's transmission line grid is mainly composed of 500 kV AC and ±500 kV DC ultra-high voltage. UHV grids are transmission networks with 1000 kV AC and ±800 kV DC voltage ratings. UHV transmission technology is a major cutting-edge technology in the world's energy field, which can improve long-distance, large-capacity transmission efficiency and reduce transmission loss. There is no UHV transmission line that has been put into commercial operation in the world. The first 1000 kV AC UHV test demonstration project under construction in China is in the southeast-Nanyang-Jingmen section.
Iron-based alloy powder is commonly used in plasma transfer arc welding (PTAW) due to its excellent mechanical properties and high resistance to corrosion and heat. This type of powder is typically composed of iron as the base metal, along with various alloying elements such as nickel, chromium, molybdenum, and tungsten.
The specific composition of the iron-based alloy powder may vary depending on the desired properties and application requirements. For example, adding nickel can increase the strength and toughness of the weld, while chromium enhances the corrosion resistance. Molybdenum and tungsten are often added to improve the high-temperature strength and creep resistance of the weld.
Iron-based alloy powders for PTAW are available in various particle sizes, typically ranging from a few micrometers to several hundred micrometers. The powder is usually fed into the plasma arc through a powder feeder, which ensures a controlled and consistent supply of powder during the welding process.
During PTAW, the powder is melted and deposited onto the workpiece, forming a weld bead. The high energy plasma arc provides the heat necessary to melt the powder and the base metal, creating a strong and durable weld joint.
Overall, iron-based alloy powder for plasma transfer arc welding offers excellent weldability, high mechanical properties, and resistance to corrosion and heat, making it suitable for a wide range of applications in industries such as aerospace, automotive, and power generation.
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