Do you know what cables are used for ships, oil platforms, submarine cable，deep sea resource exploration, sonar equipment, TST CABLES in-depth analysis of ip168 watertight cable, waterproof cable characteristics, application and selection of watertight cable knowledge guide.
Watertight cable is a kind of cable with waterproof, moistureproof, corrosion-resistant and other characteristics, with good electrical performance and mechanical properties, applied to marine engineering, petrochemical and other categories.
Watertight cable is a key component of sonar equipment, which is divided into horizontal and longitudinal two kinds, longitudinal watertight cable has better sealing effect. Longitudinal watertight cables cleverly utilize water-blocking glue or foam water-blocking tape, so that in the event of damage to the sheath, the flow of water can be slowed down inside the cable, thus enhancing the robustness of the use of equipment. The conductor is made of pure oxygen-free bare copper wire with a stranded outer diameter of 0.57mm, the insulation is made of HDPE (High Density Polyethylene), the thinnest part of which is 0.17mm, and the sheath is mainly made of butyl elastomer/polyurethane. Its structure is fine, signal transmission is stable, anti-interference ability is strong, bending resistance and tensile strength is excellent, temperature resistance is strong and wear resistance is excellent.
Conventional watertight cables rely on water-resistant paste to achieve the sealing effect. After curing at room temperature, the water-blocking paste can tightly combine the individual component structures together to form a solid whole, realizing the water-blocking effect.
Watertight cables are suitable for use in a number of demanding fields, such as ships, offshore oil platforms and deep-sea resource exploration. It can also be used for various types of submersible motor lead wires, as well as wires and cables for retractable/towable use in deep water, submersible pumps and power connections for various underwater appliances.
Watertight Cable Waterproof Cable Advantageous Characteristics
Stable signal transmission, anti-interference, resistance to bending
Watertight cables have a variety of excellent characteristics. First of all, its signal transmission stability, conductor toughness, multi-stranded fine copper wire stranded from pure copper material. Secondly, it has strong anti-interference ability, double-layer shielding design, including aluminum foil shielding and tinned copper mesh braid. Furthermore, the watertight cables have excellent bending resistance, PVC mesh cables for drag chains can withstand less than 3 million times of bending, and PUR mesh cables for drag chains can withstand less than 6 million times of bending.
Tensile Resistance High Temperature Resistance Abrasion Resistance
Watertight Cable Waterproof Cable has excellent tensile ability and Kevlar fiber filling enhances its strength. Finally, its temperature resistance is excellent, the temperature range of PVC mesh cables for drag chains is -15℃ to +70℃, while the temperature range of PUR mesh cables for drag chains is -40℃ to +70℃. The abrasion resistance is also excellent, thanks to its special production process and the recommended sheath material.
The structure of the watertight mesh cables is very fine. The conductor material is mainly pure oxygen-free bare copper wire, with a stranded outer diameter of 0.57mm. the insulation material is HDPE (High Density Polyethylene), with an average thickness of 0.20mm, with the thinnest point reaching 0.17mm. the outer diameter of the insulation has a deviation of ±0.05mm or less, and the colors are classified into (Orange White,Orange), (Green White,Green), (Blue White,Blue) and (Brown White,Brown). Sheath material is mainly NBR/PU material. The rated temperature is -20°C to +80°C, but the drag chain mesh cables can be customized for a temperature range of -55°C to +105°C. The standard deviation of the characteristic impedance is 100 ± 15 Ω. Finally, the service life is to be greater than or equal to the bending radius of the continuous movement of the bending radius of a minimum value of up to 5*D.
Watertight control cables
Watertight control cables are mainly used for electrical connections between equipment and are required to work in an underwater environment. According to the signal transmission requirements, the signal control cable can be multi-stranded stranded single-core, multi-core, multi-pairs of different combinations of core wire composition; according to the isolation requirements, the shielding form can be separate single-layer shielding, separate 2-layer shielding, single-layer total shielding, 2-layer total shielding, etc.; according to the requirements of the use of the longitudinal watertight form, the transverse sealing form.
Waterproof cable Watertight cable longitudinal waterproof and horizontal waterproof difference
Longitudinal water-blocking and transverse water-blocking are both important ways of waterproofing cables, and there are some differences in their waterproofing principles, materials, methods and application scenarios. In the process of cable waterproofing, you need to choose the appropriate waterproofing method according to the actual situation, in order to ensure the normal operation and service life of the cable.
First, the definition of longitudinal waterproofing and horizontal waterproofing
Longitudinal waterproofing refers to the length of the cable in the direction of waterproofing, that is, the water can not flow along the cable axial flow, which can prevent the cable in the water when immersed in the water, water intrusion into the internal cable leading to damage to electrical equipment.
Horizontal waterproofing is in the cross-section of the cable for waterproofing, that is, horizontal water can not enter the cable inside, it is usually used to prevent groundwater, rain and other natural water sources from the end of the cable or connection invasion leads to cable failure.
Second, the difference between longitudinal waterproofing and transverse waterproofing
The difference between longitudinal waterproofing and transverse waterproofing of cables are mainly the following points:
1. different waterproof scope: longitudinal waterproof mainly for the length of the cable to deal with the direction, to prevent water along the cable axial flow and invasion of the cable interior; and transverse waterproof mainly in the cross-section of the cable to deal with, to prevent groundwater, rain and other natural water sources from the end of the cable or connection intrusion.
2. waterproof materials are different: longitudinal waterproofing materials are usually polyethylene, asbestos and other polymer materials, which have good waterproof performance and corrosion resistance; and transverse waterproofing is usually used in silicone sealant, asphalt and other waterproofing materials with the nature of adhesion.
3. waterproofing methods are different: longitudinal waterproofing is usually used to soak the coating method, compression filling method, injection method and other ways of waterproofing cables; and transverse waterproofing is usually used to bonding, potting, sealing and other ways of waterproofing cable connections.
Third, longitudinal waterproofing and transverse waterproofing application scenarios
Longitudinal waterproofing is usually applied to cables laid in underground pipes, puddles, ditches and other humid environments more places, as well as cable joints and transformers, switches and other electrical equipment sealing place; used for ships through the warehouse connection, high reliability of the use of the environment. Requirements for the cable end face (axial) can withstand water pressure, in the specified test pressure and time, does not allow water seepage.
Transverse watertight cables: usually used for cables entering and exiting wellheads, crossing buildings and underground pipelines. Non-penetrating warehouse for underwater use environment. Requirements for the cable outer sheath (radial) can withstand water pressure, in the specified test pressure and time, the cable insulation resistance does not fall, the cable is not deformed.
Fourth, the project selection of watertight cable, waterproof cable should pay attention to the problem
According to the waterproof cable waterproof (resistant) function, in the engineering design should pay attention to the following issues:
1. According to the use of the environment, conditions of use (rated voltage and other technical requirements) and economic (cost-effective) and other factors to choose waterproof oil-paper insulated cables, medium and low-voltage underwater transmission lines, ethylene propylene rubber insulated cables, with a “water-blocking structure” of cross-linked polyethylene (XLPE) insulated cables.
2. Cross-linked polyethylene cable radial water-resistant technology is mainly used in the insulation shielding and metal shielding layer outside the semi-conducting resistance to water expansion tape, metal shielding layer outside the metal waterproof layer, medium-voltage cables generally use aluminum-plastic composite tape as a radial waterproof layer, high-voltage cables use lead, aluminum, stainless steel sealing jacket of the book as a radial waterproof layer.
3. cross-linked polyethylene cable longitudinal waterproofing is mainly used between the wires and cable core shielding area to add water-blocking substances, from the current technological development, filling with water-blocking powder is relatively good.
4. The realization of waterproof cable will certainly affect the cable heat dissipation, conductive properties, design and selection need to pay attention to a point.
5. Currently considered to be caused by cross-linked polyethylene cable “water tree” is the cause of the cable manufacturing, transportation, storage, laying process of water intrusion into the cable due to internal. The use of purified insulation and shielding materials, three-layer co-extrusion, dry cross-linking method instead of water (steam for the cross-linking medium) process measures to ensure that the cable excellent manufacturing quality.
6. For medium-voltage bulk waterproof cross-linked polyethylene cables can be formed by stranding three medium-voltage single-core water-blocking cable, this structure saves water-blocking filler materials, reduce costs, and the cable’s heat dissipation is good, and its carrying capacity increases.
The advantages of watertight cables mainly include waterproof, explosion-proof, anti-corrosion performance, high mechanical strength and high temperature resistance, as well as excellent sealing performance and stable signal transmission.
High flexibility, high toughness, resistance to bending, twisting, abrasion resistance, resistance to scoring, high resistance to pressure, resistance to electronic interference, resistance to tensile force, resistance to underwater impact force, etc. These characteristics ensure that the cable can still maintain stable working performance in the case of frequent bending and external forces. The structural design of the cable also includes an overall braided high shielding density and special structural design, which effectively resists external interference and interference within the cable, ensuring the stability of signal transmission. In addition, the watertight cable also has the advantages of small outer diameter, light weight, small footprint, low customer procurement costs, low construction costs, low network construction costs, superior bending performance and good resistance to lateral pressure performance, construction is convenient, and at the same time to provide a variety of transmission technologies, adaptability, scalability, product applicability of a wide range of surfaces, to provide a huge bandwidth to access, cost savings, and to solve the problem of network construction of the equipment power problems!
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