Product Description
1. Overview
YJLV22 cable is a type of cable widely used in the power transmission field, with excellent performance, able to adapt to various complex environmental conditions and ensure stable and reliable power transmission.
2. Structural composition
- Aluminum Conductor
As the conductive part of the cable, the aluminum core is the current transmission carrier. Aluminum has the advantages of low cost and light weight, and has certain advantages in resource reserves and processing costs, making the cable more economical in large - scale laying. Although the conductivity of aluminum is slightly inferior to that of copper, by reasonably increasing the cross - sectional area of the aluminum core, different power transmission requirements can be met. For example, in some medium - and low - voltage power transmission scenarios that are cost - sensitive and do not have particularly high resistance requirements, aluminum - cored cables are an ideal choice. The manufacturing process of the aluminum core ensures its purity and uniformity, thus ensuring that the current can be evenly distributed in the aluminum core and reducing problems such as local overheating. At the same time, the surface treatment of the aluminum core also helps to improve its adhesion to the insulating layer and enhance the overall stability of the cable.
- Cross - linked Polyethylene Insulation
Insulation principle and performance: Cross - linked polyethylene insulation forms a three - dimensional network structure of polyethylene molecular chains through cross - linking reaction. This structure greatly improves the insulation performance. It has high insulation resistance, can effectively prevent current leakage, and ensure the safety of power transmission. Under an alternating - current electric field, the dielectric constant of cross - linked polyethylene is stable, and the tangent value of the dielectric loss angle is low, which means that during the power transmission process, the power loss caused by the insulating material itself is extremely small.
Electrical strength: It has excellent electrical strength and can withstand higher voltages without breakdown. Whether under normal working voltage or under certain overvoltage conditions (such as transient overvoltage caused by lightning strikes), it can be reliably insulated to protect the aluminum core inside the cable and the external environment from being safely isolated.
Heat - resistance and thermal - aging performance: The cross - linked polyethylene insulating layer has good heat resistance, and the long - term allowable working temperature can reach 90 °C. Under short - term overload conditions, it can also withstand higher temperatures. This heat - resistant characteristic enables it to work stably in high - temperature environments (such as being laid outdoors near heating equipment or in hot climate conditions). At the same time, it has excellent thermal - aging performance, and its performance decreases slowly during long - term heating. This is because the cross - linked structure enhances the stability of the material, making the molecular chains less likely to break or deform in a high - temperature environment, thereby ensuring a long service life of the cable.
Mechanical properties: In terms of mechanical properties, the cross - linked polyethylene insulating layer has appropriate flexibility and elasticity. When the cable is bent, stretched, etc., it can deform with the cable without breaking, ensuring the integrity of the insulating layer. This mechanical property is crucial for the application of the cable in complex laying paths (such as laying around obstacles such as columns and beams in a building). At the same time, it also has a certain impact - resistance ability and can resist external forces such as slight collisions that may be encountered during installation and use.
- Steel - tape Armoring
Protection mechanism: The steel - tape armoring layer provides strong mechanical protection for the cable. When the cable is directly buried underground, it can withstand the pressure from the ground, including the heavy - object pressure generated by vehicle driving, ground construction, etc. The high strength and rigidity of the steel tape enable the cable to maintain its internal structure undamaged in this pressure environment.
Tensile and impact - resistance abilities: During the cable laying process, if it needs to withstand a certain tensile force (such as traction laying in a cable trench or pipeline), the steel - tape armoring layer can effectively resist the tensile force to prevent the cable from being broken or its internal structure from being damaged. At the same time, in an environment that may be subject to external impacts (such as laying near an area where there are excavation operations or other areas where the cable may be impacted), the steel - tape armoring can resist the impact and protect the insulating layer and aluminum core inside the cable.
Enhanced bending - resistance performance: The steel - tape armoring can also enhance the cable's bending - resistance ability. When the cable needs to go around a corner or be laid in a curved pipeline, the steel tape can provide support for the cable, reducing the stress on the insulating layer and aluminum core during the cable - bending process, reducing the risk of cable damage, and ensuring the normal operation of the cable under complex laying conditions.
- Polyvinyl Chloride Sheath
Chemical corrosion - resistance: The polyvinyl chloride sheath is the outermost protective barrier of the cable and has good chemical corrosion - resistance. In an industrial environment, the cable may come into contact with acid - base solutions, chemical gases, etc., and in an outdoor environment, it may encounter corrosive substances such as acid rain. The polyvinyl chloride sheath can effectively prevent these chemical substances from penetrating into the cable to protect the insulating layer and aluminum core from erosion.
Weather - resistance: It has excellent weather - resistance and can be used for a long time under different climatic conditions. Whether it is long - term exposure to ultraviolet radiation in the sun or changes in temperature and humidity (such as severe cold, intense heat, wet rainy seasons, etc.), the polyvinyl chloride sheath can maintain the stability of its physical and chemical properties. It will not have phenomena such as aging, cracking, and embrittlement caused by ultraviolet irradiation, nor will it absorb excessive moisture or undergo hydrolysis due to humidity changes, thereby ensuring the long - term reliability of the cable.
Abrasion - resistance and flexibility: In terms of abrasion - resistance, the polyvinyl chloride sheath plays a protective role during the process of the cable contacting and rubbing against surrounding objects (such as rubbing against the wall of the cable trench, rubbing against the pipe wall in the pipeline, etc.) to prevent the internal structure of the cable from being damaged. At the same time, the polyvinyl chloride sheath has good flexibility, which makes the cable easier to operate during the laying process and can adapt to different laying paths and environments. This flexibility also helps the cable to cope with possible slight deformations and vibrations during the use process, ensuring the stability and integrity of the cable. In addition, the appearance of the polyvinyl chloride sheath can be kept smooth and tidy, facilitating the marking of information such as model, specification, and purpose on the cable for easy cable identification and management.
3. Application fields
- Power transmission and distribution
YJLV22 cables are commonly used in medium - and low - voltage power transmission and distribution systems, including urban power grids, rural power grids, etc. In these fields, it can transmit the power from power plants or substations to various user terminals, such as residential areas, factories, commercial buildings, etc. Its excellent performance can ensure the stability and reliability of power during long - distance transmission, reducing the probability of power loss and failure.
- Industrial field
In the industrial environment, such as factories, mines, chemical enterprises, etc., YJLV22 cables are widely used for power supply to various electrical equipment. Due to the complex industrial environment, there are a large number of factors such as mechanical stress, chemical corrosion, and electromagnetic interference. The armoring and sheath structure of YJLV22 cables can effectively protect the cables, and at the same time, its good insulation performance and electrical performance meet the power supply requirements of industrial equipment.
- Building field
In the building electrical system, YJLV22 cables can be used for power supply and distribution within buildings. Whether it is a high - rise building or an ordinary residence, it can provide power for various electrical equipment such as elevators, lighting systems, and air - conditioning systems. Its fire - proof, moisture - proof, and abrasion - resistant properties enable it to adapt to the requirements of the building environment and ensure the safe operation of the power system within the building.
- Infrastructure construction
In infrastructure construction projects, such as road lighting, bridge lighting, tunnel power supply, etc., YJLV22 cables are also widely used. It can withstand various harsh conditions in the outdoor environment and provide stable power supply to electrical equipment in the infrastructure.
Product Parameters
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Rated Voltage
- Parameter Explanation: The rated voltage of YJLV22 cables usually has various specifications such as 0.6/1kV, 1.8/3kV, 3.6/6kV, 6/6kV, 6/10kV, 8.7/10kV, 8.7/15kV, etc. Rated voltage is an important parameter in cable design and use, representing the voltage range within which the cable can operate stably for a long time. For example, 0.6/1kV indicates that the cable can be used in a power system with a line voltage of 1kV and a phase voltage of 0.6kV.
- Influencing Factors: The selection of rated voltage depends on the voltage level of the power transmission system. Under different voltage levels, parameters such as the insulation thickness and material properties of the cable will be adjusted accordingly to ensure that the cable can operate safely and reliably in that voltage environment and prevent insulation breakdown and other failures.
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Number of Cores
- Common Numbers of Cores: There are usually single - core, 2 - core, 3 - core, 4 - core, 5 - core, etc. Different numbers of cores of cables are suitable for different electrical circuit configurations. For example, single - core cables are often used for single - phase alternating current or direct current transmission, and 3 - core cables are commonly used in three - phase alternating current systems. Among them, the three core wires are respectively used for transmitting three - phase electricity, and there may be an additional one for grounding (in some cases with grounding protection requirements).
- Basis for Selection: The selection of the number of cores is determined according to the specific power transmission requirements and the connection mode of electrical equipment. In some complex electrical systems, cables with more cores may be required to meet the transmission requirements of multiple signals or power sources, such as in some integrated cables that include control signals and power transmission.
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Nominal Cross - sectional Area of Conductor
- Common Specifications: The nominal cross - sectional area of the aluminum core usually has various options such as 16mm², 25mm², 35mm², 50mm², 70mm², 95mm², 120mm², 150mm², 185mm², 240mm², 300mm², etc. The cross - sectional area of the conductor determines the current - carrying capacity of the cable, that is, the maximum current value that the cable can safely carry.
- Calculation and Application: The calculation of current - carrying capacity needs to consider multiple factors, such as ambient temperature, laying method (whether it is buried underground, overhead, or laid in a cable trench, etc.), and the heat dissipation conditions of the cable. A larger cross - sectional area of the conductor can carry a larger current, but at the same time, the cost, weight, and outer diameter of the cable will also increase accordingly. In actual engineering, an appropriate cross - sectional area of the conductor should be selected according to the power load and the use environment of the cable to ensure that the cable will not be damaged by overheating during normal operation.
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Insulation Thickness
- Standard Requirements: The thickness of the cross - linked polyethylene insulation layer varies according to the rated voltage and conductor cross - sectional area of the cable. For example, for cables with a low - voltage grade (such as 0.6/1kV) and a small cross - sectional area, the insulation thickness may be relatively thin; while for cables with a high - voltage grade (such as 8.7/15kV) and a large cross - sectional area, the insulation thickness will increase to meet the insulation requirements under higher voltages.
- Impact on Performance: The insulation thickness directly affects the insulation performance of the cable. An appropriate insulation thickness can ensure that the cable has sufficient insulation strength under the rated voltage, preventing current leakage and insulation breakdown. If the insulation thickness is insufficient, problems such as partial discharge and accelerated insulation aging may occur during high - voltage or long - term operation, reducing the service life of the cable; while an excessive insulation thickness may increase the outer diameter, cost, and reduce the flexibility of the cable.
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Thickness of Steel - tape Armoring Layer
- Thickness Range: The thickness of the steel - tape armoring layer is usually about 0.2 - 0.8mm, and the specific thickness depends on the cable specifications and the requirements of the use environment. In cases where there is a need to withstand large mechanical external forces, such as in an environment where the cable is directly buried underground and may be compressed by heavy objects, a larger thickness of the steel strip may be selected.
- Function Demonstration: An appropriate thickness of the steel strip can provide sufficient mechanical protection for the cable. A thicker steel strip can better resist external pressure, tension, and impact, but it will also increase the weight and cost of the cable. When designing the cable, the mechanical stress in the cable laying environment needs to be comprehensively considered to determine the thickness of the steel - tape armoring layer.
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Thickness of Polyvinyl Chloride Sheath
- General Standards: The thickness of the polyvinyl chloride sheath is generally about 1.5 - 3mm, and there may be certain differences for different specifications of cables and different use environments. For example, in harsh outdoor environments or areas with a high risk of chemical corrosion, the thickness of the sheath may be appropriately increased.
- Connection with Protective Function: The thickness of the sheath affects the chemical corrosion resistance, abrasion resistance, and weather resistance of the cable. Sufficient sheath thickness can better protect the insulation layer and conductor inside the cable from the erosion of the external environment and extend the service life of the cable. At the same time, the sheath thickness should not be too large, otherwise it will increase the cost and outer diameter of the cable, which may cause inconvenience to cable laying and installation.
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Outer Diameter of Cable
- Calculation and Measurement: The outer diameter of the cable is jointly determined by the dimensions of each component of the cable (including the conductor, insulation layer, armoring layer, sheath, etc.). It can be calculated through design or measured using professional measuring tools during the production process. Different specifications of YJLV22 cables have different outer diameters. For example, for a 3 - core, 95mm² cross - sectional area, 0.6/1kV rated voltage YJLV22 cable, its outer diameter may be around 50 - 60mm (the specific value may vary slightly due to different manufacturers' production processes).
- Impact in Laying: The outer diameter of the cable is an important parameter during the cable laying process. When selecting cable trays, cable trench sizes, pipe diameters, and other laying facilities, the outer diameter of the cable needs to be considered to ensure that the cable can be laid smoothly. At the same time, the outer diameter of the cable will also affect the radius requirement when the cable is bent. Cables with a larger outer diameter require a larger bending radius when bent to prevent damage to the internal structure of the cable.
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Weight of Cable
- Factors in Weight Calculation: The weight of the cable mainly consists of the weights of the conductor, insulation material, steel - tape armoring, and polyvinyl chloride sheath. The density of the aluminum core is relatively small, so compared with copper - cored cables, YJLV22 cables of the same specification have certain advantages in weight. The weight of the cable increases with the increase in the conductor cross - sectional area, the thickness of the steel - tape armoring, and the thickness of the sheath. For example, for long - distance overhead - laid cables, a lighter weight can reduce the load on the tower and lower the project cost.
- Considerations in Transportation and Installation: During the transportation and installation of the cable, the weight of the cable is one of the factors to be considered. Over - heavy cables may require larger transportation equipment and hoisting tools, and more manpower and material resources are needed during the installation process. At the same time, the load - bearing capacity of the laying path also needs to be considered to prevent damage to the laying facilities caused by the excessive weight of the cable.
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Current - carrying Capacity
- Calculation Methods and Reference Factors: The calculation of the current - carrying capacity of YJLV22 cables is relatively complicated, and factors such as conductor material (aluminum), conductor cross - sectional area, insulation material performance, ambient temperature, laying method (such as buried underground, overhead, through pipes, etc.), and the spacing when multiple cables are laid side by side need to be considered. Generally, it can be determined through relevant cable current - carrying capacity standard tables or calculation software. For example, under the condition of an ambient temperature of 25°C and buried laying, the current - carrying capacity of a 3 - core, 70mm² cross - sectional area YJLV22 cable may be approximately 150 - 180A (there may be certain differences among different standards and manufacturers).
- Significance for Power Transmission: Current - carrying capacity is a key parameter to ensure the safe operation of the cable. If the actual operating current of the cable exceeds its current - carrying capacity, it will cause the cable to heat up, accelerate insulation aging, and may even cause cable short - circuit and other failures, affecting the reliability and safety of power transmission. Therefore, when designing a power system, a cable with an appropriate current - carrying capacity should be selected according to the size of the load current.
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Short - circuit Withstand Current
- Parameter Meaning and Importance: Short - circuit withstand current refers to the maximum short - circuit current value that the cable can withstand in a short time. In a power system, a short - circuit fault may instantaneously generate a huge current. If the cable cannot withstand this short - circuit current, it may lead to serious consequences such as insulation damage and conductor melting of the cable. The short - circuit withstand current capacity of YJLV22 cables is related to factors such as conductor cross - sectional area, insulation material, and armoring structure.
- Design Basis: In the design of a power system, a cable with an appropriate short - circuit withstand current capacity should be selected according to the maximum short - circuit current that may occur in the system to ensure that the cable can maintain a certain integrity within a short time when a short - circuit fault occurs, buying time for the operation of protective devices (such as circuit breakers) to cut off the fault current and reduce the loss caused by the fault.
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Bending Radius of Cable
- Regulations and Calculation: YJLV22 cables have certain requirements for the bending radius, generally 6 - 12 times the outer diameter of the cable (different voltage levels and laying methods may have different multiple requirements). For example, for a YJLV22 cable with an outer diameter of 50mm, its minimum bending radius may be between 300 - 600mm. If the bending radius of the cable is too small, the insulation layer, armoring layer, and conductor inside the cable will be subjected to excessive tensile, compressive, and other stresses, thereby damaging the cable structure and affecting cable performance.
- Precautions during Laying: During the cable laying process, especially when laying around obstacles or in curved pipes and cable trays, the requirements for the cable bending radius should be strictly followed. Special cable bending tools can be used to ensure the quality of cable bending and avoid cable damage caused by improper bending, which affects the service life of the cable and the reliability of power transmission.
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Length of Cable
- Considerations in Production and Application: The length of the cable is usually customized according to the user's requirements. In power engineering, the laying length of the cable needs to be accurately measured and calculated. Considering that the cable laying path may have bends, branches, etc., a certain margin should be reserved. For example, when laying cables in a building, the distance from the distribution room to each electrical equipment, as well as the laying lengths in different parts such as between floors and in pipes, should be considered, and a certain proportion (such as 5% - 10%) of margin should be reserved to cope with possible adjustments and losses.
- Length Measurement Methods: The length of the cable can be measured using professional length - measuring equipment during the production process, and can also be estimated on the construction site by using measuring tools (such as tape measures) combined with the planning of the laying path. Accurate measurement of the cable length is of great significance for controlling project costs, ensuring the continuity of power transmission, and reducing cable joints.
Our Advantages
Before production, conduct a circular inspection of the equipment to ensure that the probability of problems occurring at the production end is 0%.
Professional production equipment and strict requirements for product quality are our lifelines.
Conduct self-inspection during production, spot check by batch, and conduct ex-factory inspection after leaving the factory. Conduct product production supeBVRision in strict accordance with steps that far exceed the ISO 9001 quality control standard.
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