In April 2014, a WSJ report pointed out that Google began to consider the “encryption†factor in the ranking of its search service results. If some websites enable HTTPS encryption, it will obtain a higher ranking than usual. Earlier, Google has been promoting the ranking of search results only considering "quality" and "experience."
In August 2014, Google announced the official use of "encryption" as an impact factor for ranking search results. This will have a grace period, and the current "encryption" factor is still insignificant, but as time goes on, it will grow higher until all sites switch to encryption mode (HTTPS).
In December 2014, the Chrome browser team initiated a proposal suggesting that everyone explicitly mark the URL of the address bar. This proposal hopes that after the transition period, the encrypted Web site (HTTPS) will be displayed normally and the non-encrypted Web site (HTTP) will prompt "unsafe".
The HTTPS protocol that Google hopes to promote is a secure version of the HTTP protocol. HTTP is the most widely used network protocol on the Internet. It is used to transfer information between clients and clients. The most famous application is the browser. IE, Chrome, and 360 browsers that we normally use on the Internet depend on it. It can work.
The content of the HTTP transmission is in plaintext. The content you have browsed and submitted on the Internet. All the people working in the background, such as the owner of the router, the uninformed route of the cable route, the provincial and municipal operators, the backbone network of the operator, and the Carrier gateways, etc. can all see. If you visit a foreign website, you must also add international broadband exports, foreign operators, etc. This list can be extended until you turn fearful of the Internet.
HTTPS adds cryptographic functions to the lower layers of HTTP. Content transmitted over the HTTPS protocol is basically impossible to decrypt unless the above-mentioned participants of the link are prepared in advance. Preparing in advance, the attack is also very difficult.
This is the reason why Google hopes that the Internet will be HTTPS, or even put forward the slogan “HTTP = Insecurityâ€. In the past few years, we have been living in the era of the Ming dynasty. All traces of the Internet are exposed in the eyes of giant institutions.
U.S. NSA uses cookies generated by Google services to pinpoint the Internet traces of any suspects they suspect; Verizon tracks users' Internet access records on their customized carrier carriers; Consort has no difference with all broadband operators in China. The implementation of JS injection into the user-visited web pages, advertising pop-ups on the pages, and the "dead work", a "broadband exit firewall" built by mass Cisco equipment.
In front of them, we actually have no privacy at all, regardless of nationality or geographical boundaries.
However, upgrading HTTPS is also a big challenge. It means that the infrastructure, network architecture, and underlying service providers have changed. HTTPS is called a cache terminator, performance killer, just Google one, it is difficult to push everyone to make changes.
In particular, there are also changes in the concept. Who will accept Google’s role in those countries that ignore user privacy? Count on Baidu that is not included in the HTTPS website?
Product introduction
1000kVA and above Oil Immersed Transformers must be equipped with outdoor signal thermometers and can be connected to remote signals. Oil immersed transformers of 800kVA and above shall be equipped with gas relay and pressure protection device. Oil immersed transformers of 800kVA and below can also be equipped with gas relay according to the use requirements and through consultation with the manufacturer. Dry type transformers shall be equipped with temperature measuring devices according to the manufacturer's regulations, generally 630kVA and above transformers.
According to the phase number of a single transformer, it can be divided into three-phase transformer and single-phase transformer. In three-phase power systems, three-phase transformers are generally used. When the capacity is too large and limited by transportation conditions, three single-phase transformers can also be used to form a transformer bank in three-phase power systems.
According to the number of windings, it can be divided into two winding transformers and three winding transformers. Generally, transformers are double winding transformers, that is, there are two windings on the iron core, one is the primary winding and the other is the secondary winding. The three winding transformer is a transformer with large capacity (above 5600 KVA), which is used to connect three different voltage transmission lines. In special cases, there are also transformers with more windings.
According to the structure, it can be divided into core type transformer and shell type transformer. If the winding is wrapped around the iron core, it is an iron core transformer; If the iron core is wrapped around the winding, it is a shell type transformer. However, they are slightly different in structure and have no essential difference in principle. All power transformers are iron core type.
According to insulation and cooling conditions, it can be divided into oil immersed transformer and Dry Type Transformer. In order to strengthen the insulation and cooling conditions, the core and winding of the transformer are immersed together in the oil tank filled with transformer oil. In special cases, such as street lamps and mine lighting, dry-type transformers are also used.
In addition, there are various special transformers for special purposes. For example, high-voltage transformer for test, transformer for electric furnace, transformer for electric welding and transformer for SCR circuit, voltage transformer and current transformer for measuring instrument.
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