Tianlian Communication Cable HYA22500 * 2 * 0.5 Welcome to purchase

Description :

　　Complete knowledge of wires and cables 1. Example: Main cable 70mm2, calculated current 220A, voltage drop V0=0.36X10-3V/A.m

　　2. Three phase allowable length L=19/√ 3x200x0.36x10-3=130m

　　3. The concept of wires and cables and the distinction between wires and cables: Regarding the daily maintenance and management of communication fiber optic cable lines, relevant reference materials 1. Prevention of communication fiber optic cable line failures. In order to reduce the occurrence of communication fiber optic cable line failures and do a good job in communication fiber optic cable line maintenance, it is necessary to strictly implement the policy of "prevention first, combination of prevention and control", carefully maintain, scientifically manage, keep equipment intact and in good condition, maintain good transmission quality, prevent line failures and eliminate them as soon as possible

　　2. Preventive maintenance is carried out according to predetermined cycles and prescribed standards For the daily maintenance of communication optical cable lines, each person can be responsible for managing 40-50 kilometers of optical cable lines, mainly responsible for guarding the identification of the lines, external disturbances, etc

　　3. Controlled maintenance mainly utilizes detection equipment and manual testing data to compare and predict the changes in fiber optic curves, in order to avoid the occurrence of faults

　　4. Corrective maintenance mainly involves correcting and repairing faults, which is carried out after a fault occurs, with the aim of restoring the equipment to its original performance This task will be completed by the emergency repair team Corrective maintenance requires a strong emphasis on not only relying on OTDR test curves and data when a fault occurs, but mainly on on-site investigation. Investigation and visits should be conducted to understand the terrain, landforms, engineering construction, and changes in the surrounding environment of the optical cable line, as well as to speed up the handling of the fault

　　5. For the fault testing of communication optical cables, the staff should have a clear understanding of the transmission performance of the communication optical cable lines in order to timely detect and handle abnormalities. Regular and irregular testing should be conducted on the optical fibers, with the main fiber being tested once a year. Irregular testing may be determined as needed. When a suspicious channel is found, fiber adjustment testing can be conducted at any time The testing content mainly includes: the backscatter signal curve of the fiber optic line and the quality inspection of the connector The testing method generally adopts the backward method, and the OTDR instrument can simultaneously complete the above testing content To check the attenuation of the fiber optic line, compare its test results with the completion test records and previous periodic test records of the line The backscatter signal curve of the fiber optic line is mainly observed for any abnormalities in the curve, such as large step losses outside the joint and excessive joint losses

　　Tianlian Communication Cable HYA22500 * 2 * 0.5 Welcome to purchase

　　Application areas of wires and cables: 1. Communication cables and optical fibers, mainly used in the broadband communication industry. With the rapid development of the communication industry in the past two decades, products have also experienced astonishing growth rates. From simple telephone and telegraph cables in the past to thousands of pairs of telephone cables, coaxial cables, fiber optic cables, data cables, composite communication cables, etc. This type of product structure requires high manufacturing accuracy.

　　2. Power cables are used for power transmission. The main features of this type of product are: extruding (winding) an insulation layer outside the conductor, such as overhead insulated cables, or twisting several cores (corresponding to the phase line, neutral line, and ground line of the power system), such as two core or more overhead insulated cables, or adding a protective sheath layer, such as plastic/rubber sheathed wires and cables. The main process technologies include drawing, twisting, insulation extrusion (wrapping), cabling, armor, protective layer extrusion, etc. The different process combinations of various products have certain differences. The product is mainly used for the transmission of strong electrical energy in power generation, distribution, transmission, transformation, and power supply lines, with high currents (tens of amps to thousands of amps) and high voltages (220V to 500kV and above).

　　3. Electrical equipment wires and cables are used in special occasions. The main features of this type of product are: a wide variety of specifications, a wide range of applications, and a high usage voltage of 1kV and below. In the face of special occasions, new products are constantly emerging, such as fire-resistant cables, flame-retardant cables, low smoke halogen-free/low smoke low halogen cables, anti termite, anti mouse cables, oil resistant/cold resistant/temperature resistant/wear-resistant cables, medical/agricultural/mining cables, thin-walled wires, etc.

　　4. Bare wires and bare conductor products are mainly used as semi-finished products for various wires and cables, with a small amount used in the manufacturing of communication wires and electrical appliances.. This type of pure conductor metal has no insulation or sheath layer, such as steel cored aluminum stranded wire, copper aluminum busbar, electric locomotive line, etc; The processing technology mainly involves pressure processing, such as melting, rolling, drawing, twisting/compression twisting, etc; The product is mainly used in suburban areas, rural areas, user main lines, switchgear, etc.

　　5. Electromagnetic wire (winding wire) is mainly used for various motors, instruments, etc. This type of derivative/new product belongs to the category of wires and cables, mainly due to different application scenarios, application requirements, equipment convenience, and requirements for reducing equipment costs, etc., which require the use of new materials, special materials, or changes in product structure. Using different materials such as flame-retardant cables, low smoke halogen-free/low smoke halogen-free cables, anti termite, anti mouse cables, oil resistant/cold resistant/temperature resistant cables, etc; Changing product structure, such as fire-resistant cables; Improve process requirements such as medical cables, etc; Combination products such as OPGW, etc; Convenient installation and reduced equipment costs, such as prefabricated branch cables.

　　Tianlian Communication Cable HYA22500 * 2 * 0.5 Welcome to purchase

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