The structural elements of control cable products are generally divided into the main structural elements of conductor, insulating layer, shielding and protective layer, as well as filling elements and stretching elements. According to the use requirements and application of products, some products are extremely simple in structure and are a kind of conductor structure, such as overhead bare conductor, catenary conductor, copper aluminum bus (bus), etc, The external electrical insulation of these products is ensured by the space distance from the insulator (i.e. air insulation) during installation and laying. Then, let's have a look at the structure of the control cable product!
1. Conductor
The wire is an indispensable main component for the product to transmit current and electromagnetic wave information. The wire is the abbreviation of conductive wire core, which is made of nonferrous metals with excellent conductivity such as copper and aluminum. The optical fiber cable for optical communication network that has developed rapidly in the past 30 years takes optical fiber as the wire.
2. Insulating layer
The control cable is wrapped around the conductor with electrically insulated parts, that is, the transmitted current, electromagnetic wave and light wave can only move along the conductor and cannot flow to the outside. The potential on the conductor can be cut off, that is, the potential difference formed by the surrounding objects, that is, the voltage. The normal transmission function of the conductor must be ensured, At the same time, to ensure the safety of external objects and human body, the conductor and insulation layer are two basic components required for cable products other than bare wires.
3. Protective layer
When the control cable sets wires and cables in various environments for operation, it is necessary to protect the whole product, especially the parts of the insulation layer, which is called the protective layer.
As the insulation materials are required to have excellent electrical insulation properties, they are required to have high purity and few impurities; In most cases, it is impossible to give consideration to the protection ability to the outside world, so various protective layer structures must bear the resistance and resistance to various mechanical forces from the outside world (i.e., settings, use scenarios, and use), atmospheric environment resistance, chemical resistance and oil resistance, biological invasion prevention, and fire damage reduction.
Most cable products and insulating layer materials with certain mechanical strength and weather resistance, which are specially used for clean, dry, indoor and other good external environments without external mechanical force, can also have no components such as protective layer.
4. Shielding
It is the part that separates the electromagnetic field in the cable product from the external electromagnetic field; The different pairs (or groups) of cable products inside the cable products must also be isolated from each other. The shielding layer can be said to be an "electromagnetic isolation screen".
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