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Today’s society has been covered by various networks, and the network has closely linked all countries in the world, and the subsea optical cable is the main artery to ensure the interconnection between major regional networks around the world. So how important is the undersea cable, and will the US economy collapse once it is cut off?
A terminal lug is an old object, as early as 1928, Phoenix Contact invented the world’s first piece of the combined terminal lug, the modern cable terminal lug prototype. And the modern terminal lug is more than this.
The ocean covers more than 70% of the earth’s surface and is rich in resources.
The marine ecosystem is the most important in the world, and human survival and development are closely related to the ocean. Nowadays, we can know the world’s affairs without leaving home, and the submarine fiber optic cable buried deep under the sea plays a vital role.
Mineral insulated cable, a copper sheath-wrapped copper conductor core, and magnesium oxide powder as inorganic insulating material to isolate the conductor and the sheath of the cable, the outermost layer can be selected according to the need for appropriate protection sleeve.
Rigid mineral insulated cable was invented earlier, at the end of the 19th century. The Swiss engineer Arnold Francois Borel on the idea of mineral insulated cable, and received a patent in 1896, 1934-1936, France, and Britain into production after the rapid development.
China also developed in the 1960s, began to be used in the military field, the mid-1980s began industrial production, and was gradually accepted by the construction field in full.
The invention of flexible mineral-insulated fire-resistant cable is relatively late. About the 1970s was born in Switzerland at Stout Cable Company.
Thoroughly remove the oil, dirt, insulation layer, etc. from the base material before welding. heating the base material first when welding, heating the thick part first, then the thin part. heating the copper part first, then the aluminum part.
Move the torch back and forth to evenly heat the welded part, the temperature of the welded part reaches 450-500°C, the welding wire will be added to the welded part.
Let the wire melt evenly into the weld (do not use the flame to heat directly against the wire, the temperature of the base material mainly dissolves the wire).
Then slightly sweep the welding part with the flame to ensure that the welding part brazing material spreads to positioning, remove the gun and let it cool naturally, and you can complete the welding.
The aging problem of fiber optic cable is hidden, but it poses a great threat to the operation quality and safety of telecommunication transmission network, which may cause significant losses to enterprises and requires our great attention.
On foreign video sites, there is such a video with 1.7 million plays, the video, the naughty shark is destroying the submarine cable, accidentally captured by the camera. Then the question arises, what is the role of the submarine cable? Do sharks do damage from time to time?
The types of submarine cables can be briefly divided into four aspects.
1. From the structure, is mainly divided into three-core submarine cables and single-core submarine cables. Low- and medium-voltage lines use mostly three-core submarine cable, and high-voltage lines use mostly single-core submarine cable.
In order to better facilitate engineers to quickly grasp some of the expertise of thermocouples. I have collected the thermocouple 15 difficult questions about thermocouples, the details are as follows.
There are several key types of thermocouple wire graduation numbers, such as S, R, B, N, K, E, J, T, etc. Among them, S, R, and B belong to precious metal thermocouples, and N, K, E, J, and T belong to cheap metal thermocouples.