Selection of marine cables
For today's extremely sophisticated and sophisticated electronic products, it is necessary to avoid ocean-going marine cable failure. People have simply can not accept even a brief downtime, who can not afford to pay more than the useful life of several years ahead of the expensive mechanical equipment, especially when the profit margins are small, when the competition is particularly fierce.
Cable manufacturers have been striving to challenge a wider temperature range, more shielding features and higher mechanical durability, as well as extremely harsh environments and more complex applications required to withstand bending and chemical resistance and other characteristics. However, cable failures and system downtime still occur from time to time.
If you can choose the right marine cable from the start, many problems caused by cable failures (especially in extreme and harsh environments) can be avoided. Indeed, it is easy to match the correct temperature range and then rely on the jacket of the PVC material to achieve protection. However, the issues to be considered are far more than that. Before the final selection of the fully matched cable, the engineers have to consider a lot of details, for example, to focus on how the cable will work when used for extreme temperatures to determine the type of chemicals (grease, fuel, solvent, etc.) that may be in contact, Understand the difference between flex and bend performance, and grading against UV and EMI / RFI interference.
Flexibility and bending
The flexible cable requires a specific bending shield. When the shield is torn, loss of continuity, select the standard foil shield will lead to system failure. Should be kept in mind the difference between flexibility and bending performance. It is important that the marine cable be able to be bent and assembled, the installation of the flexible cable is simpler, and the fault detection of the cabinet and / or cable slot is also simplified. It is important to note that when a cable is used for connection to a cabinet, a circular cable provides better sealing than a typical spiral cable. Therefore, to go through the line of consideration and then choose the correct degree of bending. In some manufacturing applications, the cable will continue to be bent. The ability to withstand millions of times is much more complicated than flexibility.
So how do you choose to bend the cable? First of all to consider the type of bending, is a single axis, twisted, or multi-axis? Each type requires the cable has different characteristics. For example, single-axis control cables require the highest performance (up to 14 million cycles) and also require a flexible cable structure with continuous bending shields. In applications requiring a lower uniaxial environment, a bend-type structure is required and at least one million flexible cable is required. In twisted or different applications such as torsional robots, there is a need for complex cables that can be wound and ground at 350 ° / m for any robot.
The primary factor - shielding
Marine cables need to shield high-frequency, low-frequency electrical noise transmission and radiation to provide protection of the signal, especially in some critical applications. But because of the different environment, it is difficult to determine what kind of shielding to protect the signal.
When special protection is required for the signal (eg military applications, certain military specifications and applications require shielded cable crosstalk and conducted EMI), a cable with three layers of sheet metal foil weave is selected to ensure continuity of ground and eliminate Transmission gap. If only the general EMI protection (conduction and radiation) is required, the commonly used foil shield is sufficient. Chemical, grease, solvent and fuel environments
The effect of chemicals on the cable in the application environment is often overlooked, except in the case of particularly significant impacts, such as the effect of grease on the polymer cable jacket. It is important to take into account that the performance of many materials in the same chemical environment is not the same due to the difference in strength and exposure.
It is also important to note that the temperature will have an impact on chemicals. For example, high temperatures can produce steam, affecting the integrity of ocean-going marine cables, but the cable will not be affected.
In addition to considering the chemical resistance of the cable, also note the potential of the fluid inlet. Therefore, the external geometry of the cable is also critical to the integrity of the system.
The effect of temperature
All engineers and system designers will choose to meet the working environment of the temperature requirements of the marine cable. However, the extreme effects of extreme temperatures are easily overlooked. For example, a cable with a nominal temperature range of -13 ° C can be unaffected at -13 ° C, but low temperatures can affect its physical properties.
Classification of marine cables
1, PVC power cable.
2, silane cross-linked polyethylene insulated power cable.
3, XLPE insulated power cable.
4, flame retardant cable.
7, plastic insulated control cable.
8, aluminum wire and ACSR.
9, rated below 10KV overhead insulated cable.
10, general rubber flexible cable, marine wire and electricity.
11, mine wire and cable.
12, PVC insulated fixed laying with wire and cable.
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