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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.
Male Coupling Connector Type:
End through connector, straight connectors, tees, elbows, with live nut joints, Swivel joints, plug, transition joints
Composed of dual ferrule fittings: Before the snap ring, after the snap ring nut
Materials commonly used are stainless steel and carbon steel
NPT, PT, G is the pipe thread.
NPT is National (American) Pipe Thread abbreviation belong American standard tapered pipe thread 60 degree, for North America. National standards can be found GB / T12716-1991
Pipe Thread PT is an abbreviation, is 55 degrees sealing cone pipe thread, is a Whitworth thread family, more for Europe and the Commonwealth countries. Commonly used in water and gas pipe industry, defined as 1:16 taper. National standards can be found GB / T7306-2000
G is 55 degrees non-thread sealing pipe thread, is a Whitworth thread family. G represents a threaded barrel mark. National standards can be found GB / T7307-2001
Also thread 1 / 4,1 / 2,1 / 8 mark refers to the thread diameter in inches.
Insiders usually points to refer to the thread size, one inch equals 8 points, 1/4-inch is 2 points, and so on.
G is the pipe thread collectively (Guan), divided into 55, 60 degrees are functional, commonly known as a round tube. That thread processing is made by a cylindrical surface.
ZG commonly known as the funnel, that thread processing by a conical surface made of pipe joints in general are like this, the old domestic thread standard male thread Rc labeled as R
Domestic maximum voltage breaking capacity of the world's strongest DC circuit breakers available
On October 20, Zhejiang Zhoushan Flexible HVDC Transmission System 200kV High Voltage DC Circuit Breaker (hereinafter referred to as "Zhoushan Flexible Circuit Breakers") type-testing expert witness meeting was held in the State Key Laboratory of Advanced Power Transmission Technology of the United Research Institute. The meeting invited domestic DC Transmission experts in the field of witness.