At present, the high-voltage vacuum circuit breaker has reached 145kV single fracture, 168kV double fracture, is now developing higher voltage grade products. The products are tank-type and porcelain-column in structure. China has made a porcelain pillar type 126kV vacuum circuit breaker, while Japan's 168kV vacuum circuit breaker adopts a tank structure.
In the vacuum arc extinguishing outdoor insulation, low pressure SF6 gas such as (inner charge pressure 0.12MPa) is used for insulation, and dry air is also used as the outer insulation.
It is worth mentioning that China's two high-voltage switch mainstream manufacturers have recently developed a porcelain-type vacuum circuit breaker, such as the successful completion of the National Ministry of Science and Technology project 126kV vacuum circuit breaker in 2010, and passed the National Ministry of Science and Technology acceptance. The arc extinguishing chamber of this product adopts a longitudinal magnetic field coil structure and uses copper-chromium contact materials with high breaking capacity and good resistance to welding. The supporting vacuum interrupter is the first domestically completed product with complete intellectual property rights, and its technical level is at the international advanced level. The other company is Pinggao Group. Pinggao Group, while vigorously developing high-voltage and large-capacity SF6 circuit breakers, also lost no time in developing high-voltage vacuum circuit breakers. In November 2011, the group also conducted four national product appraisals of LW55-72.5 tank SF6 circuit breakers, ZW55-63 high voltage vacuum circuit breakers, ZW55-2x31.5 and ZW55-31.5 vacuum circuit breakers. , Overall reaching the international advanced level.
At the 2011 Hannover Fair, Siemens exhibited the use of nitrogen-filled (N2) insulated 72.5kV vacuum circuit breakers to replace the traditional SF6 circuit breakers, which shows that Siemens began to focus on the development of high voltage vacuum circuit breakers.
At high voltage levels, the development of vacuum circuit breakers is a requirement for the development of the situation, which can greatly reduce the use of SF6 greenhouse gases, contribute to environmental protection and reduce the greenhouse effect in the atmosphere. At the same time, the high-voltage vacuum circuit breaker has good low-temperature resistance characteristics, which can avoid the liquefaction of SF6 gas in high-cold areas. It is the best choice for high-voltage circuit breakers in cold regions.
In the research and development of high voltage vacuum circuit breakers, a series of technical problems need to be solved: high voltage vacuum insulation, high current vacuum breaking, rated current and temperature rise, mechanical characteristics, vacuum arc extinguishing outdoor insulation and capacitive current breaking, small inductive current Break and so on. The solution of these technical problems has promoted the progress of vacuum circuit breaker technology. However, the development of high-voltage vacuum circuit breakers is still in the ascendant and research work still needs to be vigorously carried out.
The HP laptop charger is used to recharge the battery in HP notebook and to provide dependable power for operating the notebook for long periods of time. If the original power charger fails, a replacement AC power charger is necessary, and you can buy all kinds of the HP replacement Laptop Charger from YIDASHUN.
HP/Compaq laptop include hp chromebook series, hp pavilion series, hp envy series, hp eliteBook series, hp stream series and so on. Different specifications of laptop charger Adapter is suitable for different laptop model. Such as 90W 19.5V 4.62A with 4.5*3.0 dc tip, it applies for the HP Touchsmart Sleekbook 15 17 M6 M7 Series; HP Pavilion 11 14 15 17, HP Stream 11 13 14 etc. The common HP laptop charger specification has 30W 19V 1.58A, 65W 18.5V 3.5A, 90W 19V 4.74A etc, and the dc tip has common 5.5*2.5mm, 4.8*1.7mm, 7.4*5.0mm and 4.5*3.0mm etc. Also YIDASHUN can produce new usb type c laptop adapter, there are 20W, 45W and 65W.
Yidahsun's laptop adapter are with smart IC to protect your laptop with over current protection, over load protection, short circuit protection and over heat protection!
All Yidashun hp computer charger is Brand New Replacement Product, works as Genuine parts, 100% OEM Compatible!!
HP Laptop Charger,Compaq Laptop Charger,HP Notebook Charger,HP Computer Charger
Shenzhen Yidashun Technology Co., Ltd. , https://www.ydsadapter.com