do you know? In 2025, China’s IPv6 scale will reach the top in the world.
It is reported that the current global IP address based on IPv4 (about 3.4 billion) has been basically allocated. According to the recently released "2014 IPv6 Address Resource Allocation and Application Report" by China Internet Network Information Center (CNNIC), as of December 31 last year, China's total IPv6 address allocation ranked second in the world, but currently domestic IPv6 The actual application level is low. Let's take a look at the related content with the network communication Xiaobian.
As we all know, as a "unified language" in the Internet, IPv4 and IPv6 standard protocols are also important content of this architecture. Among them, IPv6 is the next-generation Internet IP protocol designed by the Internet Engineering Task Force (IETF) to replace IPv4, and is an extended version of the "unified language." At the end of 2017, China’s Action Plan for Promoting the Scale of Internet Protocol Version 6 (IPv6) (hereinafter referred to as the “Planâ€) mentioned that it will promote the construction of IPv6 commercial networks.
According to the 2017 IPv6 Support Report, the number of websites currently supporting IPv6 is increasing, including websites such as Google, Facebook, Yahoo, and Microsoft Bing, which have provided permanent IPv6 access services. Global IPv6 test center monitoring data also shows that Alexa's top 50 websites have IPv6 support rate of 42%, and websites such as Google, Wikipedia and Yahoo can be accessed through IPv6. In contrast, most of our websites do not have access to IPv6, and only one of the top 50 websites has a stable IPv6 access address.
Wu Jianping, an academician of the Chinese Academy of Engineering and a professor at Tsinghua University, said that according to the "plan", by the end of 2018, the market-driven benign development environment will basically take shape. The number of IPv6 active users in China will reach 200 million, and the proportion among Internet users will be no less than 20%. . This means that after India and the United States, China will become the third country in the world with more than 100 million IPv6 users. At the end of 2020, the number of IPv6 active users reached 500 million. At the end of 2025, China's IPv6 scale will reach the top in the world.
As of the end of October 2016, IPv4 address pools in Asia Pacific, Europe, Latin America, and North America have been completely exhausted. According to the latest data from CNNIC, China's 751 million Internet users have only 338 million IPv4 addresses and 0.45 IP addresses per capita. IPv6 has designed 2128 addresses, which means that the number of addresses is more than the number of sands on the earth, which solves the problem of address scarcity.
According to the "Plan", this year will upgrade the existing network security system to enhance the support for IPv6 addresses and network environment. Strictly implement the IPv6 network address coding scheme, strengthen the IPv6 address filing management, and jointly promote the IPv6 deployment and network real-name system, implement technical interface requirements, and enhance the IPv6 address accurate positioning, detection attack and rapid processing capabilities. Conduct network security level protection, personal information protection, risk assessment, notification and early warning, disaster backup and recovery for IPv6. In particular, this year will also carry out research on network security technologies, management and mechanisms in the fields of industrial Internet, Internet of Things, cloud computing, big data, artificial intelligence in IPv6 environment.
Of course, the increase is not only the website but also the opportunity. According to the latest statistics, in more than 8,000 Internet standards, the standards set by the Chinese have increased from one in 2005 to nearly 100. However, as a big Internet application country, China is far from being an Internet powerhouse. It has not fully mastered the core technology, has not had enough voice, and has no strength to make rules.
In Wu Jianping's view, IPv6 is a platform that can carry almost all applications. Various communication systems can be used downwards, and various network services can be provided to everyone. The current challenges and opportunities come first from the technical level. The new frame structure of IPv6 reserves some bytes for adding functions, and there will be new technical space. Under the new space, China started at about the same time as the developed countries.
Structure and working principle:
1. The main structural type of pressure relief valve is external spring type, with or without directional guiding device. Its main components are composed of spring, valve seat, spring seat, valve housing (cover), marker rod, signal switch (occurrence box), sealing ring and other parts.
2. Working principle
When an accident occurs inside the oil immersed transformer, the oil in the oil tank is vaporized, generating a large amount of gas, which makes the internal pressure of the oil tank rise sharply. If the pressure is not released in time, the fuel tank will be deformed or burst. The installation of the pressure relief valve means that when the pressure in the oil tank rises to the opening pressure of the pressure relief valve, the pressure relief valve opens rapidly within 2ms, making the pressure in the oil tank drop quickly. When the pressure drops to the closing pressure value of the pressure relief valve, the pressure relief valve is closed reliably, so that the positive pressure in the oil tank is always maintained, effectively preventing external air, moisture and other impurities from entering the oil tank; When the pressure relief valve is opened, the marker rod is in the direction of. The upper action and obvious extension of the top cover indicate that the pressure relief valve has been operated. When the pressure relief valve is closed, the marker rod remains at the position after opening, and then it can only be reset manually. Compared with the safety airway, it has the advantages of accurate and reliable movement, no damage to parts after movement, and no replacement.
purpose
â— The product has electrical alarm signal, which can realize remote monitoring.
â— Applicable to liquid or gas insulated transformers, transformers, on load tap changers, high-voltage switches and other electrical products.
â— In case of internal failure of electrical equipment, the valve will open to release the pressure in the oil tank to avoid deformation and bursting of the oil tank.
â— When the pressure in the oil tank drops to the closing pressure of the valve, the valve will be closed again to prevent external moisture and impurities from entering the tank.
◠Ambient temperature: - 30 ℃~40 ℃.
â— Installation position:
a) Installed on the fuel tank cap;
b) On the upper side wall of the oil tank;
c) Raise the seat.
Pressure Relief Valve,Gas Relief Valve,Gas Relief Safety Valve,Electric Contact Pressure Valve
Henan New Electric Power Co.,Ltd. , https://www.newelectricpower.com