15:50, Zhoushan soft straight circuit breaker successfully completed large current breaking test, the device successfully cut off 15.6 kA of DC current, marking China's first independent research and development, the world's highest voltage level, the strongest breaking capacity DC circuit breaker The overall technical indicators have reached the international advanced level.
Flexible DC transmission system can not achieve the rapid removal of DC fault, seriously hampered the development of overhead wire straight line and multi-terminal and DC power grid. The successful development of HVDC circuit breakers provides an effective solution to break the technical bottleneck faced by the flexible system , To ensure the safety of the DC power grid, flexible and economical operation. At present, the HVDC circuit breakers and their testing technology are all in the research stage all over the world. There is no mature standard for reference. The HVDC circuit breaker test method and technology research are carried out to fully test the performance of the equipment and ensure the application of equipment engineering Safety and reliability are paramount.
Global Energy Internet Research Institute relies on major national science and technology projects and State Grid science and technology project support, based on independent innovation, research painstakingly studied the HVDC circuit breaker test equivalent mechanism analysis and equivalent evaluation method, put forward a large current operation, high voltage resistance Subject to the breaking and closing test methods and assessment standards, the full-scale test device capable of comprehensively examining the composite stress such as electricity, heat and machinery that can withstand the actual operation of the DC circuit breaker has been built and all the type tests of the DC circuit breaker have been completed.
Zhoushan soft straight circuit breaker passed the test for the company DC circuit breaker test standards and the implementation of the project laid a solid technical foundation to improve the State Grid Corporation in the field of HVDC technology influence and voice, to further consolidate the high-voltage direct current Transmission of the leading position in the field of great significance.
The CNC milling process is a digital manufacturing process that is implemented by computer numerically controlled (CNC) machines. This process is used to produce parts with complex shapes, and the manufacturing process involves multiple steps. The following are the detailed steps of the general CNC milling process:Design: First, you need to design a CAD model of the parts you want to produce. A CAD model is a three-dimensional image created using computer-aided design software that can describe the shape, size, and features of a part.Programming: Next, you need to convert the CAD model into G-code, which is a type of computer instruction that controls the movement and operation of the CNC machine. G Code can be written manually or generated automatically using CAM software.Prepare the machine: Before you start machining, you need to check and prepare the CNC machine. This includes checking the machine's coordinate system, setting tools and cutters, and setting parameters such as the machine's speed and feed speed.Processing: After the machine is ready, the processing can begin. The machining process usually consists of multiple steps, such as roughing, finishing and drilling. At each step, the CNC machine moves tools and workpieces according to instructions in the G code to achieve the desired cutting operation.Inspection: After processing, the parts need to be inspected to ensure that they meet the design requirements and specifications. Inspection can be carried out by using measuring instruments, templates and other testing tools.Polishing and surface treatment: Parts can be polished and surface treated if needed to improve their surface finish and corrosion resistance. This can be done through the use of abrasives, chemicals and other tools.In short, the CNC milling process is a high-precision, high-efficiency manufacturing process for the production of parts with complex shapes. Through the control of CAD model and G code, the precise control of machine motion can be realized, so as to achieve high-precision parts processing.
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