Congratulations on the launch of the new version website of Gaobeidian Hangcheng Machinery Factory
Congratulations on the launch of the new version website of Gaobeidian Hangcheng Machinery Factory!
Hangcheng Machinery Factory joins hands with China Astronautics Standards Institute in the R&D and production of cemented carbide, rotary files (tungsten carbide burrs), milling cutters, saw blades and other solid carbides. The company is equipped with sophisticated equipment, advanced technologies and strong technical forces. Its products passed through the technical identification in 1987 and won the Best Award on the 7th National Invention Show in 1993, and the 4th China New Technology and New Product Gold Award in 1994. And the factory was identified as the Hi-tech Enterprise by the provincial Science and Technology Commission in 1999; and passed the ISO-S9002 Quality System Certification in 2000.
Our factory is committed to the research and development of special carbide blades and cooperates with friends both at home and abroad with quality products, reasonable prices and first-class services.
Shouldering the task of revitalizing national industry as its responsibility, our factory, in a tenet of “Credit First, Excellent Quality, Customer Foremost, Perfect Service” and in a struggling spirit, strives for more brilliance!
Tungsten is an irreplaceable basic material and strategic resource in our national economy and modern national defense. Tungsten carbide rotary file, with high hardness and excellent wear resistance, is used to manufacture a variety of cutting tools, tools, drilling tools and wear-resistant parts, widely used in military, aerospace, mechanical processing, metallurgy, oil drilling,
High voltage direct current (HVDC) technology, since its rise in the 1950s, has experienced more than 40 years of development, has become an increasingly mature technology. By 1995, 62 HVDC projects had been successfully put into operation in the world, and it is expected that about 20 more HVDC projects will be put into operation by 2002.
This paper introduces the development of 1 000 kV ultra high voltage transmission relay protection and monitoring technology in foreign countries, and puts forward some technical problems to be studied in this field. This paper presents a relay protection and monitoring system platform for substation based on IEC 61850 standard. This platform can adapt to the characteristics of UHV transmission and has strong real-time performance. It is an information platform that integrates relay protection, emergency control and system stability.
The tower and pole test station built by Electric Power Construction Research Institute in 2004 carried out the prototype strength test of UHV single loop 8×800 split conductor, 30 ° ~60 ° Angle tower and UHV transmission line anti-vibration design scheme.