The coaxial shielded cables consist of central multi-wire copper isolated current-conducting strand, around which thin copper wires or tapes are wound on the spiral; they play the role of opposite conductor. Coaxial cables displace traditional one-strand cables as a result of their higher speed of data transmission especially with large length of cables and at wok with television equipment.
The common element in the construction of this group of cables is a logging element in the form of two-layered steel armor. The standard design of coaxial cables is given in Fig. S.2.1 and S.2.2, where 1- is coaxial pair; 2- is additional power conductors; 3 - is two-layered armor.
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Fig. 4.2.1 |
Fig. 4.2.2 |
Basic characteristics of coaxial cables are given in tables S.2.1 and S.2.2.
Mechanical Properties of Armored Logging Coaxial Cables
Electrical Properties of Armored Logging Coaxial Cables
Some peculiarities of coaxial cables:
1. Cables have longitudinal hermetic sealing by shield.
2. Cables differ by modification of the shielding conductor (Fig. S.2.3):
- the shield, superimposed by coiling thin copper wires on the isolated core,
- screen out of flat copper tapes,
- shield, carried out by braiding with the alternation of copper wires and the polyester thread.
3. For the cables for sea works the cable armor is impregnated under the pressure by the special anticorrosive compounds which serve the purpose of protection of metal in conditions of sea fog and contact with sea water.
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Fig. S.2.3. Screen Modifications - copper strap. - braiding by copper wire with thread - copper wires in a layer in the cable KG(1K2,0+12x1,0)-240 |
Fig. S.2.4. Drum with cable |
At the moment the major spheres of coaxial cables application are - sea trawling fleet and deep water geophysical and geological studies, including towing underwater apparatuses and borax machine tools, videoshooting, the selection of bottom samples.
